src/video/SDL_surface.c
author Sylvain Becker <sylvain.becker@gmail.com>
Mon, 04 Feb 2019 08:34:24 +0100
changeset 12589 85bc5436a005
parent 12587 b2d4dcb4ba33
child 12590 b50bedb4bca0
permissions -rw-r--r--
Rename surface aligned memory flag to SDL_SIMD_ALIGNED
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2019 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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*/
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#include "../SDL_internal.h"
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#include "SDL_video.h"
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#include "SDL_sysvideo.h"
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#include "SDL_blit.h"
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#include "SDL_RLEaccel_c.h"
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#include "SDL_pixels_c.h"
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#include "SDL_yuv_c.h"
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#include "../../cpuinfo/SDL_simd.h"
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/* Check to make sure we can safely check multiplication of surface w and pitch and it won't overflow size_t */
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SDL_COMPILE_TIME_ASSERT(surface_size_assumptions,
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    sizeof(int) == sizeof(Sint32) && sizeof(size_t) >= sizeof(Sint32));
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/* Public routines */
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/*
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 * Calculate the pad-aligned scanline width of a surface
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 */
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static int
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SDL_CalculatePitch(Uint32 format, int width)
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{
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    int pitch;
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    /* Surface should be 4-byte aligned for speed */
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    pitch = width * SDL_BYTESPERPIXEL(format);
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    switch (SDL_BITSPERPIXEL(format)) {
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    case 1:
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        pitch = (pitch + 7) / 8;
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        break;
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    case 4:
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        pitch = (pitch + 1) / 2;
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        break;
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    default:
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        break;
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    }
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    pitch = (pitch + 3) & ~3;   /* 4-byte aligning */
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    return pitch;
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}
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/*
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 * Create an empty RGB surface of the appropriate depth using the given
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 * enum SDL_PIXELFORMAT_* format
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 */
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SDL_Surface *
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SDL_CreateRGBSurfaceWithFormat(Uint32 flags, int width, int height, int depth,
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                               Uint32 format)
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{
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    SDL_Surface *surface;
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    /* The flags are no longer used, make the compiler happy */
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    (void)flags;
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    /* Allocate the surface */
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    surface = (SDL_Surface *) SDL_calloc(1, sizeof(*surface));
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    if (surface == NULL) {
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        SDL_OutOfMemory();
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        return NULL;
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    }
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    surface->format = SDL_AllocFormat(format);
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    if (!surface->format) {
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        SDL_FreeSurface(surface);
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        return NULL;
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    }
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    surface->w = width;
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    surface->h = height;
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    surface->pitch = SDL_CalculatePitch(format, width);
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    SDL_SetClipRect(surface, NULL);
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    if (SDL_ISPIXELFORMAT_INDEXED(surface->format->format)) {
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        SDL_Palette *palette =
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            SDL_AllocPalette((1 << surface->format->BitsPerPixel));
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        if (!palette) {
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            SDL_FreeSurface(surface);
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            return NULL;
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        }
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        if (palette->ncolors == 2) {
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            /* Create a black and white bitmap palette */
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            palette->colors[0].r = 0xFF;
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            palette->colors[0].g = 0xFF;
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            palette->colors[0].b = 0xFF;
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            palette->colors[1].r = 0x00;
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            palette->colors[1].g = 0x00;
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            palette->colors[1].b = 0x00;
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        }
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        SDL_SetSurfacePalette(surface, palette);
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        SDL_FreePalette(palette);
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    }
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    /* Get the pixels */
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    if (surface->w && surface->h) {
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        /* Assumptions checked in surface_size_assumptions assert above */
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        Sint64 size = ((Sint64)surface->h * surface->pitch);
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        if (size < 0 || size > SDL_MAX_SINT32) {
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            /* Overflow... */
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            SDL_FreeSurface(surface);
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            SDL_OutOfMemory();
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            return NULL;
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        }
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        surface->pixels = SDL_malloc((size_t)size);
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        if (!surface->pixels) {
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            SDL_FreeSurface(surface);
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            SDL_OutOfMemory();
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            return NULL;
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        }
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        /* This is important for bitmaps */
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        SDL_memset(surface->pixels, 0, surface->h * surface->pitch);
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    }
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    /* Allocate an empty mapping */
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    surface->map = SDL_AllocBlitMap();
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    if (!surface->map) {
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        SDL_FreeSurface(surface);
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        return NULL;
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    }
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    /* By default surface with an alpha mask are set up for blending */
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    if (surface->format->Amask) {
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        SDL_SetSurfaceBlendMode(surface, SDL_BLENDMODE_BLEND);
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    }
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    /* The surface is ready to go */
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    surface->refcount = 1;
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    return surface;
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}
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/*
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 * Create an empty RGB surface of the appropriate depth
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 */
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SDL_Surface *
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SDL_CreateRGBSurface(Uint32 flags,
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                     int width, int height, int depth,
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                     Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask)
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{
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    Uint32 format;
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    /* Get the pixel format */
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    format = SDL_MasksToPixelFormatEnum(depth, Rmask, Gmask, Bmask, Amask);
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    if (format == SDL_PIXELFORMAT_UNKNOWN) {
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        SDL_SetError("Unknown pixel format");
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        return NULL;
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    }
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    return SDL_CreateRGBSurfaceWithFormat(flags, width, height, depth, format);
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}
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/*
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 * Create an RGB surface from an existing memory buffer
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 */
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SDL_Surface *
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SDL_CreateRGBSurfaceFrom(void *pixels,
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                         int width, int height, int depth, int pitch,
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                         Uint32 Rmask, Uint32 Gmask, Uint32 Bmask,
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                         Uint32 Amask)
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{
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    SDL_Surface *surface;
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    surface = SDL_CreateRGBSurface(0, 0, 0, depth, Rmask, Gmask, Bmask, Amask);
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    if (surface != NULL) {
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        surface->flags |= SDL_PREALLOC;
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        surface->pixels = pixels;
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        surface->w = width;
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        surface->h = height;
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        surface->pitch = pitch;
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        SDL_SetClipRect(surface, NULL);
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    }
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    return surface;
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}
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/*
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 * Create an RGB surface from an existing memory buffer using the given given
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 * enum SDL_PIXELFORMAT_* format
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 */
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SDL_Surface *
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SDL_CreateRGBSurfaceWithFormatFrom(void *pixels,
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                         int width, int height, int depth, int pitch,
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                         Uint32 format)
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{
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    SDL_Surface *surface;
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    surface = SDL_CreateRGBSurfaceWithFormat(0, 0, 0, depth, format);
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    if (surface != NULL) {
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        surface->flags |= SDL_PREALLOC;
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        surface->pixels = pixels;
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        surface->w = width;
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        surface->h = height;
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        surface->pitch = pitch;
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        SDL_SetClipRect(surface, NULL);
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    }
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    return surface;
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}
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int
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SDL_SetSurfacePalette(SDL_Surface * surface, SDL_Palette * palette)
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{
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    if (!surface) {
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        return SDL_SetError("SDL_SetSurfacePalette() passed a NULL surface");
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    }
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    if (SDL_SetPixelFormatPalette(surface->format, palette) < 0) {
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        return -1;
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    }
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    SDL_InvalidateMap(surface->map);
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    return 0;
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}
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int
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SDL_SetSurfaceRLE(SDL_Surface * surface, int flag)
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{
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    int flags;
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    if (!surface) {
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        return -1;
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    }
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    flags = surface->map->info.flags;
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    if (flag) {
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        surface->map->info.flags |= SDL_COPY_RLE_DESIRED;
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    } else {
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        surface->map->info.flags &= ~SDL_COPY_RLE_DESIRED;
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    }
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    if (surface->map->info.flags != flags) {
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        SDL_InvalidateMap(surface->map);
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    }
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    return 0;
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}
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int
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SDL_SetColorKey(SDL_Surface * surface, int flag, Uint32 key)
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{
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    int flags;
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    if (!surface) {
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        return SDL_InvalidParamError("surface");
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    }
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    if (surface->format->palette && key >= ((Uint32) surface->format->palette->ncolors)) {
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        return SDL_InvalidParamError("key");
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    }
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    if (flag & SDL_RLEACCEL) {
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        SDL_SetSurfaceRLE(surface, 1);
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    }
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    flags = surface->map->info.flags;
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    if (flag) {
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        surface->map->info.flags |= SDL_COPY_COLORKEY;
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        surface->map->info.colorkey = key;
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    } else {
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        surface->map->info.flags &= ~SDL_COPY_COLORKEY;
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    }
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    if (surface->map->info.flags != flags) {
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        SDL_InvalidateMap(surface->map);
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    }
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    return 0;
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}
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SDL_bool
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SDL_HasColorKey(SDL_Surface * surface)
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{
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    if (!surface) {
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        return SDL_FALSE;
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    }
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    if (!(surface->map->info.flags & SDL_COPY_COLORKEY)) {
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        return SDL_FALSE;
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    }
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    return SDL_TRUE;
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}
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int
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SDL_GetColorKey(SDL_Surface * surface, Uint32 * key)
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{
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    if (!surface) {
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        return SDL_InvalidParamError("surface");
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    }
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    if (!(surface->map->info.flags & SDL_COPY_COLORKEY)) {
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        return SDL_SetError("Surface doesn't have a colorkey");
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    }
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    if (key) {
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        *key = surface->map->info.colorkey;
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    }
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    return 0;
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}
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/* This is a fairly slow function to switch from colorkey to alpha */
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static void
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SDL_ConvertColorkeyToAlpha(SDL_Surface * surface, SDL_bool ignore_alpha)
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{
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    int x, y;
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   318
slouken@2786
   319
    if (!surface) {
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        return;
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    }
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   322
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   323
    if (!(surface->map->info.flags & SDL_COPY_COLORKEY) ||
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        !surface->format->Amask) {
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        return;
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    }
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   327
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   328
    SDL_LockSurface(surface);
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   329
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   330
    switch (surface->format->BytesPerPixel) {
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    case 2:
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        {
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            Uint16 *row, *spot;
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            Uint16 ckey = (Uint16) surface->map->info.colorkey;
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            Uint16 mask = (Uint16) (~surface->format->Amask);
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   336
sylvain@12566
   337
            /* Ignore, or not, alpha in colorkey comparison */
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            if (ignore_alpha) {
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   339
                ckey &= mask;
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   340
                row = (Uint16 *) surface->pixels;
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   341
                for (y = surface->h; y--;) {
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   342
                    spot = row;
sylvain@12566
   343
                    for (x = surface->w; x--;) {
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   344
                        if ((*spot & mask) == ckey) {
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   345
                            *spot &= mask;
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   346
                        }
sylvain@12566
   347
                        ++spot;
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                    }
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   349
                    row += surface->pitch / 2;
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   350
                }
sylvain@12566
   351
            } else {
sylvain@12566
   352
                row = (Uint16 *) surface->pixels;
sylvain@12566
   353
                for (y = surface->h; y--;) {
sylvain@12566
   354
                    spot = row;
sylvain@12566
   355
                    for (x = surface->w; x--;) {
sylvain@12566
   356
                        if (*spot == ckey) {
sylvain@12566
   357
                            *spot &= mask;
sylvain@12566
   358
                        }
sylvain@12566
   359
                        ++spot;
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   360
                    }
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   361
                    row += surface->pitch / 2;
sylvain@12566
   362
                }
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   363
            }
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   364
        }
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   365
        break;
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   366
    case 3:
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   367
        /* FIXME */
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   368
        break;
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   369
    case 4:
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   370
        {
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   371
            Uint32 *row, *spot;
slouken@2786
   372
            Uint32 ckey = surface->map->info.colorkey;
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   373
            Uint32 mask = ~surface->format->Amask;
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   374
sylvain@12566
   375
            /* Ignore, or not, alpha in colorkey comparison */
sylvain@12566
   376
            if (ignore_alpha) {
sylvain@12566
   377
                ckey &= mask;
sylvain@12566
   378
                row = (Uint32 *) surface->pixels;
sylvain@12566
   379
                for (y = surface->h; y--;) {
sylvain@12566
   380
                    spot = row;
sylvain@12566
   381
                    for (x = surface->w; x--;) {
sylvain@12566
   382
                        if ((*spot & mask) == ckey) {
sylvain@12566
   383
                            *spot &= mask;
sylvain@12566
   384
                        }
sylvain@12566
   385
                        ++spot;
slouken@2786
   386
                    }
sylvain@12566
   387
                    row += surface->pitch / 4;
slouken@2786
   388
                }
sylvain@12566
   389
            } else {
sylvain@12566
   390
                row = (Uint32 *) surface->pixels;
sylvain@12566
   391
                for (y = surface->h; y--;) {
sylvain@12566
   392
                    spot = row;
sylvain@12566
   393
                    for (x = surface->w; x--;) {
sylvain@12566
   394
                        if (*spot == ckey) {
sylvain@12566
   395
                            *spot &= mask;
sylvain@12566
   396
                        }
sylvain@12566
   397
                        ++spot;
sylvain@12566
   398
                    }
sylvain@12566
   399
                    row += surface->pitch / 4;
sylvain@12566
   400
                }
slouken@2786
   401
            }
slouken@2786
   402
        }
slouken@2786
   403
        break;
slouken@2786
   404
    }
slouken@2785
   405
slouken@2786
   406
    SDL_UnlockSurface(surface);
slouken@2785
   407
slouken@2786
   408
    SDL_SetColorKey(surface, 0, 0);
slouken@2884
   409
    SDL_SetSurfaceBlendMode(surface, SDL_BLENDMODE_BLEND);
slouken@2785
   410
}
slouken@2785
   411
slouken@2267
   412
int
slouken@2267
   413
SDL_SetSurfaceColorMod(SDL_Surface * surface, Uint8 r, Uint8 g, Uint8 b)
slouken@2266
   414
{
slouken@2266
   415
    int flags;
slouken@2266
   416
slouken@2266
   417
    if (!surface) {
slouken@2266
   418
        return -1;
slouken@2266
   419
    }
slouken@2266
   420
slouken@2266
   421
    surface->map->info.r = r;
slouken@2266
   422
    surface->map->info.g = g;
slouken@2266
   423
    surface->map->info.b = b;
slouken@2266
   424
slouken@2266
   425
    flags = surface->map->info.flags;
slouken@2266
   426
    if (r != 0xFF || g != 0xFF || b != 0xFF) {
slouken@2266
   427
        surface->map->info.flags |= SDL_COPY_MODULATE_COLOR;
slouken@2266
   428
    } else {
slouken@2266
   429
        surface->map->info.flags &= ~SDL_COPY_MODULATE_COLOR;
slouken@2266
   430
    }
slouken@2266
   431
    if (surface->map->info.flags != flags) {
slouken@2266
   432
        SDL_InvalidateMap(surface->map);
slouken@2266
   433
    }
slouken@2266
   434
    return 0;
slouken@2266
   435
}
slouken@2266
   436
slouken@2266
   437
slouken@2267
   438
int
slouken@2267
   439
SDL_GetSurfaceColorMod(SDL_Surface * surface, Uint8 * r, Uint8 * g, Uint8 * b)
slouken@2266
   440
{
slouken@2266
   441
    if (!surface) {
slouken@2266
   442
        return -1;
slouken@2266
   443
    }
slouken@2266
   444
slouken@2266
   445
    if (r) {
slouken@2266
   446
        *r = surface->map->info.r;
slouken@2266
   447
    }
slouken@2266
   448
    if (g) {
slouken@2266
   449
        *g = surface->map->info.g;
slouken@2266
   450
    }
slouken@2266
   451
    if (b) {
slouken@2266
   452
        *b = surface->map->info.b;
slouken@2266
   453
    }
slouken@2266
   454
    return 0;
slouken@2266
   455
}
slouken@2266
   456
slouken@2267
   457
int
slouken@2267
   458
SDL_SetSurfaceAlphaMod(SDL_Surface * surface, Uint8 alpha)
slouken@2266
   459
{
slouken@2266
   460
    int flags;
slouken@2266
   461
slouken@2266
   462
    if (!surface) {
slouken@2266
   463
        return -1;
slouken@2266
   464
    }
slouken@2266
   465
slouken@2266
   466
    surface->map->info.a = alpha;
slouken@2266
   467
slouken@2266
   468
    flags = surface->map->info.flags;
slouken@2266
   469
    if (alpha != 0xFF) {
slouken@2266
   470
        surface->map->info.flags |= SDL_COPY_MODULATE_ALPHA;
slouken@2266
   471
    } else {
slouken@2266
   472
        surface->map->info.flags &= ~SDL_COPY_MODULATE_ALPHA;
slouken@2266
   473
    }
slouken@2266
   474
    if (surface->map->info.flags != flags) {
slouken@2266
   475
        SDL_InvalidateMap(surface->map);
slouken@2266
   476
    }
slouken@2266
   477
    return 0;
slouken@2266
   478
}
slouken@2266
   479
slouken@2267
   480
int
slouken@2267
   481
SDL_GetSurfaceAlphaMod(SDL_Surface * surface, Uint8 * alpha)
slouken@2266
   482
{
slouken@2266
   483
    if (!surface) {
slouken@2266
   484
        return -1;
slouken@2266
   485
    }
slouken@2266
   486
slouken@2266
   487
    if (alpha) {
slouken@2266
   488
        *alpha = surface->map->info.a;
slouken@2266
   489
    }
slouken@2266
   490
    return 0;
slouken@2266
   491
}
slouken@2266
   492
slouken@2267
   493
int
slouken@4929
   494
SDL_SetSurfaceBlendMode(SDL_Surface * surface, SDL_BlendMode blendMode)
slouken@2266
   495
{
slouken@2266
   496
    int flags, status;
slouken@2266
   497
slouken@2266
   498
    if (!surface) {
slouken@2266
   499
        return -1;
slouken@2266
   500
    }
slouken@2266
   501
slouken@2266
   502
    status = 0;
slouken@2266
   503
    flags = surface->map->info.flags;
slouken@5184
   504
    surface->map->info.flags &=
slouken@5184
   505
        ~(SDL_COPY_BLEND | SDL_COPY_ADD | SDL_COPY_MOD);
slouken@2266
   506
    switch (blendMode) {
slouken@2884
   507
    case SDL_BLENDMODE_NONE:
slouken@2266
   508
        break;
slouken@2884
   509
    case SDL_BLENDMODE_BLEND:
slouken@2266
   510
        surface->map->info.flags |= SDL_COPY_BLEND;
slouken@2266
   511
        break;
slouken@2884
   512
    case SDL_BLENDMODE_ADD:
slouken@2266
   513
        surface->map->info.flags |= SDL_COPY_ADD;
slouken@2266
   514
        break;
slouken@5184
   515
    case SDL_BLENDMODE_MOD:
slouken@5184
   516
        surface->map->info.flags |= SDL_COPY_MOD;
slouken@5184
   517
        break;
slouken@2266
   518
    default:
icculus@7037
   519
        status = SDL_Unsupported();
slouken@2266
   520
        break;
slouken@2266
   521
    }
slouken@2266
   522
slouken@2266
   523
    if (surface->map->info.flags != flags) {
slouken@2266
   524
        SDL_InvalidateMap(surface->map);
slouken@2266
   525
    }
slouken@2267
   526
slouken@2266
   527
    return status;
slouken@2266
   528
}
slouken@2266
   529
slouken@2267
   530
int
slouken@4929
   531
SDL_GetSurfaceBlendMode(SDL_Surface * surface, SDL_BlendMode *blendMode)
slouken@2266
   532
{
slouken@2266
   533
    if (!surface) {
slouken@2266
   534
        return -1;
slouken@2266
   535
    }
slouken@2266
   536
slouken@2266
   537
    if (!blendMode) {
slouken@2266
   538
        return 0;
slouken@2266
   539
    }
slouken@2266
   540
slouken@5184
   541
    switch (surface->map->
slouken@5184
   542
            info.flags & (SDL_COPY_BLEND | SDL_COPY_ADD | SDL_COPY_MOD)) {
slouken@2266
   543
    case SDL_COPY_BLEND:
slouken@2884
   544
        *blendMode = SDL_BLENDMODE_BLEND;
slouken@2266
   545
        break;
slouken@2266
   546
    case SDL_COPY_ADD:
slouken@2884
   547
        *blendMode = SDL_BLENDMODE_ADD;
slouken@2266
   548
        break;
slouken@5184
   549
    case SDL_COPY_MOD:
slouken@5184
   550
        *blendMode = SDL_BLENDMODE_MOD;
slouken@5184
   551
        break;
slouken@2266
   552
    default:
slouken@2884
   553
        *blendMode = SDL_BLENDMODE_NONE;
slouken@2266
   554
        break;
slouken@2266
   555
    }
slouken@2266
   556
    return 0;
slouken@2266
   557
}
slouken@2266
   558
slouken@1895
   559
SDL_bool
slouken@1895
   560
SDL_SetClipRect(SDL_Surface * surface, const SDL_Rect * rect)
slouken@0
   561
{
slouken@1895
   562
    SDL_Rect full_rect;
slouken@0
   563
slouken@1895
   564
    /* Don't do anything if there's no surface to act on */
slouken@1895
   565
    if (!surface) {
slouken@1895
   566
        return SDL_FALSE;
slouken@1895
   567
    }
slouken@0
   568
slouken@1895
   569
    /* Set up the full surface rectangle */
slouken@1895
   570
    full_rect.x = 0;
slouken@1895
   571
    full_rect.y = 0;
slouken@1895
   572
    full_rect.w = surface->w;
slouken@1895
   573
    full_rect.h = surface->h;
slouken@0
   574
slouken@1895
   575
    /* Set the clipping rectangle */
slouken@1895
   576
    if (!rect) {
slouken@1895
   577
        surface->clip_rect = full_rect;
slouken@4966
   578
        return SDL_TRUE;
slouken@1895
   579
    }
slouken@1895
   580
    return SDL_IntersectRect(rect, &full_rect, &surface->clip_rect);
slouken@0
   581
}
slouken@1895
   582
slouken@1895
   583
void
slouken@1895
   584
SDL_GetClipRect(SDL_Surface * surface, SDL_Rect * rect)
slouken@0
   585
{
slouken@1895
   586
    if (surface && rect) {
slouken@1895
   587
        *rect = surface->clip_rect;
slouken@1895
   588
    }
slouken@0
   589
}
slouken@1895
   590
slouken@7191
   591
/*
slouken@0
   592
 * Set up a blit between two surfaces -- split into three parts:
slouken@7191
   593
 * The upper part, SDL_UpperBlit(), performs clipping and rectangle
slouken@0
   594
 * verification.  The lower part is a pointer to a low level
slouken@0
   595
 * accelerated blitting function.
slouken@0
   596
 *
slouken@7191
   597
 * These parts are separated out and each used internally by this
slouken@0
   598
 * library in the optimimum places.  They are exported so that if
slouken@0
   599
 * you know exactly what you are doing, you can optimize your code
slouken@0
   600
 * by calling the one(s) you need.
slouken@0
   601
 */
slouken@1895
   602
int
slouken@1895
   603
SDL_LowerBlit(SDL_Surface * src, SDL_Rect * srcrect,
slouken@1895
   604
              SDL_Surface * dst, SDL_Rect * dstrect)
slouken@0
   605
{
slouken@1895
   606
    /* Check to make sure the blit mapping is valid */
slouken@1895
   607
    if ((src->map->dst != dst) ||
slouken@5288
   608
        (dst->format->palette &&
slouken@6166
   609
         src->map->dst_palette_version != dst->format->palette->version) ||
slouken@6166
   610
        (src->format->palette &&
slouken@6166
   611
         src->map->src_palette_version != src->format->palette->version)) {
slouken@1895
   612
        if (SDL_MapSurface(src, dst) < 0) {
slouken@1895
   613
            return (-1);
slouken@1895
   614
        }
bob@2328
   615
        /* just here for debugging */
bob@2329
   616
/*         printf */
bob@2329
   617
/*             ("src = 0x%08X src->flags = %08X src->map->info.flags = %08x\ndst = 0x%08X dst->flags = %08X dst->map->info.flags = %08X\nsrc->map->blit = 0x%08x\n", */
bob@2329
   618
/*              src, dst->flags, src->map->info.flags, dst, dst->flags, */
bob@2329
   619
/*              dst->map->info.flags, src->map->blit); */
slouken@1895
   620
    }
slouken@2257
   621
    return (src->map->blit(src, srcrect, dst, dstrect));
slouken@0
   622
}
slouken@0
   623
slouken@0
   624
slouken@1895
   625
int
slouken@4949
   626
SDL_UpperBlit(SDL_Surface * src, const SDL_Rect * srcrect,
slouken@1895
   627
              SDL_Surface * dst, SDL_Rect * dstrect)
slouken@0
   628
{
slouken@1895
   629
    SDL_Rect fulldst;
slouken@1895
   630
    int srcx, srcy, w, h;
slouken@0
   631
slouken@1895
   632
    /* Make sure the surfaces aren't locked */
slouken@1895
   633
    if (!src || !dst) {
icculus@7037
   634
        return SDL_SetError("SDL_UpperBlit: passed a NULL surface");
slouken@1895
   635
    }
slouken@1895
   636
    if (src->locked || dst->locked) {
icculus@7037
   637
        return SDL_SetError("Surfaces must not be locked during blit");
slouken@1895
   638
    }
slouken@0
   639
slouken@1895
   640
    /* If the destination rectangle is NULL, use the entire dest surface */
slouken@1895
   641
    if (dstrect == NULL) {
slouken@1895
   642
        fulldst.x = fulldst.y = 0;
slouken@7511
   643
        fulldst.w = dst->w;
slouken@7511
   644
        fulldst.h = dst->h;
slouken@1895
   645
        dstrect = &fulldst;
slouken@1895
   646
    }
slouken@0
   647
slouken@1895
   648
    /* clip the source rectangle to the source surface */
slouken@1895
   649
    if (srcrect) {
slouken@1895
   650
        int maxw, maxh;
slouken@0
   651
slouken@1895
   652
        srcx = srcrect->x;
slouken@1895
   653
        w = srcrect->w;
slouken@1895
   654
        if (srcx < 0) {
slouken@1895
   655
            w += srcx;
slouken@1895
   656
            dstrect->x -= srcx;
slouken@1895
   657
            srcx = 0;
slouken@1895
   658
        }
slouken@1895
   659
        maxw = src->w - srcx;
slouken@1895
   660
        if (maxw < w)
slouken@1895
   661
            w = maxw;
slouken@0
   662
slouken@1895
   663
        srcy = srcrect->y;
slouken@1895
   664
        h = srcrect->h;
slouken@1895
   665
        if (srcy < 0) {
slouken@1895
   666
            h += srcy;
slouken@1895
   667
            dstrect->y -= srcy;
slouken@1895
   668
            srcy = 0;
slouken@1895
   669
        }
slouken@1895
   670
        maxh = src->h - srcy;
slouken@1895
   671
        if (maxh < h)
slouken@1895
   672
            h = maxh;
slouken@0
   673
slouken@1895
   674
    } else {
slouken@1895
   675
        srcx = srcy = 0;
slouken@1895
   676
        w = src->w;
slouken@1895
   677
        h = src->h;
slouken@1895
   678
    }
slouken@0
   679
slouken@1895
   680
    /* clip the destination rectangle against the clip rectangle */
slouken@1895
   681
    {
slouken@1895
   682
        SDL_Rect *clip = &dst->clip_rect;
slouken@1895
   683
        int dx, dy;
slouken@0
   684
slouken@1895
   685
        dx = clip->x - dstrect->x;
slouken@1895
   686
        if (dx > 0) {
slouken@1895
   687
            w -= dx;
slouken@1895
   688
            dstrect->x += dx;
slouken@1895
   689
            srcx += dx;
slouken@1895
   690
        }
slouken@1895
   691
        dx = dstrect->x + w - clip->x - clip->w;
slouken@1895
   692
        if (dx > 0)
slouken@1895
   693
            w -= dx;
slouken@1895
   694
slouken@1895
   695
        dy = clip->y - dstrect->y;
slouken@1895
   696
        if (dy > 0) {
slouken@1895
   697
            h -= dy;
slouken@1895
   698
            dstrect->y += dy;
slouken@1895
   699
            srcy += dy;
slouken@1895
   700
        }
slouken@1895
   701
        dy = dstrect->y + h - clip->y - clip->h;
slouken@1895
   702
        if (dy > 0)
slouken@1895
   703
            h -= dy;
slouken@1895
   704
    }
slouken@1895
   705
slouken@7834
   706
    /* Switch back to a fast blit if we were previously stretching */
slouken@7834
   707
    if (src->map->info.flags & SDL_COPY_NEAREST) {
slouken@7834
   708
        src->map->info.flags &= ~SDL_COPY_NEAREST;
slouken@7834
   709
        SDL_InvalidateMap(src->map);
slouken@7834
   710
    }
slouken@7834
   711
slouken@1895
   712
    if (w > 0 && h > 0) {
slouken@1895
   713
        SDL_Rect sr;
slouken@1895
   714
        sr.x = srcx;
slouken@1895
   715
        sr.y = srcy;
slouken@1895
   716
        sr.w = dstrect->w = w;
slouken@1895
   717
        sr.h = dstrect->h = h;
slouken@1895
   718
        return SDL_LowerBlit(src, &sr, dst, dstrect);
slouken@1895
   719
    }
slouken@1895
   720
    dstrect->w = dstrect->h = 0;
slouken@1895
   721
    return 0;
slouken@0
   722
}
slouken@0
   723
ken@5296
   724
int
ken@5499
   725
SDL_UpperBlitScaled(SDL_Surface * src, const SDL_Rect * srcrect,
ken@5499
   726
              SDL_Surface * dst, SDL_Rect * dstrect)
ken@5499
   727
{
slouken@9076
   728
    double src_x0, src_y0, src_x1, src_y1;
slouken@9076
   729
    double dst_x0, dst_y0, dst_x1, dst_y1;
slouken@9076
   730
    SDL_Rect final_src, final_dst;
slouken@9076
   731
    double scaling_w, scaling_h;
slouken@9076
   732
    int src_w, src_h;
slouken@9076
   733
    int dst_w, dst_h;
ken@5499
   734
ken@5499
   735
    /* Make sure the surfaces aren't locked */
ken@5499
   736
    if (!src || !dst) {
icculus@7037
   737
        return SDL_SetError("SDL_UpperBlitScaled: passed a NULL surface");
ken@5499
   738
    }
ken@5499
   739
    if (src->locked || dst->locked) {
icculus@7037
   740
        return SDL_SetError("Surfaces must not be locked during blit");
ken@5499
   741
    }
ken@5499
   742
slouken@9076
   743
    if (NULL == srcrect) {
slouken@9076
   744
        src_w = src->w;
slouken@9076
   745
        src_h = src->h;
slouken@9076
   746
    } else {
slouken@9076
   747
        src_w = srcrect->w;
slouken@9076
   748
        src_h = srcrect->h;
ken@5499
   749
    }
ken@5499
   750
slouken@9076
   751
    if (NULL == dstrect) {
slouken@9076
   752
        dst_w = dst->w;
slouken@9076
   753
        dst_h = dst->h;
ken@5499
   754
    } else {
slouken@9076
   755
        dst_w = dstrect->w;
slouken@9076
   756
        dst_h = dstrect->h;
ken@5499
   757
    }
ken@5499
   758
slouken@9076
   759
    if (dst_w == src_w && dst_h == src_h) {
slouken@9076
   760
        /* No scaling, defer to regular blit */
slouken@9076
   761
        return SDL_BlitSurface(src, srcrect, dst, dstrect);
ken@5499
   762
    }
ken@5499
   763
slouken@9076
   764
    scaling_w = (double)dst_w / src_w;
slouken@9076
   765
    scaling_h = (double)dst_h / src_h;
slouken@9076
   766
slouken@9076
   767
    if (NULL == dstrect) {
slouken@9076
   768
        dst_x0 = 0;
slouken@9076
   769
        dst_y0 = 0;
slouken@9076
   770
        dst_x1 = dst_w - 1;
slouken@9076
   771
        dst_y1 = dst_h - 1;
slouken@9076
   772
    } else {
slouken@9076
   773
        dst_x0 = dstrect->x;
slouken@9076
   774
        dst_y0 = dstrect->y;
slouken@9076
   775
        dst_x1 = dst_x0 + dst_w - 1;
slouken@9076
   776
        dst_y1 = dst_y0 + dst_h - 1;
ken@5499
   777
    }
ken@5499
   778
slouken@9076
   779
    if (NULL == srcrect) {
slouken@9076
   780
        src_x0 = 0;
slouken@9076
   781
        src_y0 = 0;
slouken@9076
   782
        src_x1 = src_w - 1;
slouken@9076
   783
        src_y1 = src_h - 1;
slouken@9076
   784
    } else {
slouken@9076
   785
        src_x0 = srcrect->x;
slouken@9076
   786
        src_y0 = srcrect->y;
slouken@9076
   787
        src_x1 = src_x0 + src_w - 1;
slouken@9076
   788
        src_y1 = src_y0 + src_h - 1;
slouken@9076
   789
slouken@9076
   790
        /* Clip source rectangle to the source surface */
slouken@9076
   791
slouken@9076
   792
        if (src_x0 < 0) {
slouken@9076
   793
            dst_x0 -= src_x0 * scaling_w;
slouken@9076
   794
            src_x0 = 0;
slouken@9076
   795
        }
slouken@9076
   796
slouken@9076
   797
        if (src_x1 >= src->w) {
slouken@9076
   798
            dst_x1 -= (src_x1 - src->w + 1) * scaling_w;
slouken@9076
   799
            src_x1 = src->w - 1;
slouken@9076
   800
        }
slouken@9076
   801
slouken@9076
   802
        if (src_y0 < 0) {
slouken@9076
   803
            dst_y0 -= src_y0 * scaling_h;
slouken@9076
   804
            src_y0 = 0;
slouken@9076
   805
        }
slouken@9076
   806
slouken@9076
   807
        if (src_y1 >= src->h) {
slouken@9076
   808
            dst_y1 -= (src_y1 - src->h + 1) * scaling_h;
slouken@9076
   809
            src_y1 = src->h - 1;
slouken@9076
   810
        }
slouken@9076
   811
    }
slouken@9076
   812
slouken@9076
   813
    /* Clip destination rectangle to the clip rectangle */
slouken@9076
   814
slouken@9076
   815
    /* Translate to clip space for easier calculations */
slouken@9076
   816
    dst_x0 -= dst->clip_rect.x;
slouken@9076
   817
    dst_x1 -= dst->clip_rect.x;
slouken@9076
   818
    dst_y0 -= dst->clip_rect.y;
slouken@9076
   819
    dst_y1 -= dst->clip_rect.y;
slouken@9076
   820
slouken@9076
   821
    if (dst_x0 < 0) {
slouken@9076
   822
        src_x0 -= dst_x0 / scaling_w;
slouken@9076
   823
        dst_x0 = 0;
slouken@9076
   824
    }
slouken@9076
   825
slouken@9076
   826
    if (dst_x1 >= dst->clip_rect.w) {
slouken@9076
   827
        src_x1 -= (dst_x1 - dst->clip_rect.w + 1) / scaling_w;
slouken@9076
   828
        dst_x1 = dst->clip_rect.w - 1;
slouken@9076
   829
    }
slouken@9076
   830
slouken@9076
   831
    if (dst_y0 < 0) {
slouken@9076
   832
        src_y0 -= dst_y0 / scaling_h;
slouken@9076
   833
        dst_y0 = 0;
slouken@9076
   834
    }
slouken@9076
   835
slouken@9076
   836
    if (dst_y1 >= dst->clip_rect.h) {
slouken@9076
   837
        src_y1 -= (dst_y1 - dst->clip_rect.h + 1) / scaling_h;
slouken@9076
   838
        dst_y1 = dst->clip_rect.h - 1;
slouken@9076
   839
    }
slouken@9076
   840
slouken@9076
   841
    /* Translate back to surface coordinates */
slouken@9076
   842
    dst_x0 += dst->clip_rect.x;
slouken@9076
   843
    dst_x1 += dst->clip_rect.x;
slouken@9076
   844
    dst_y0 += dst->clip_rect.y;
slouken@9076
   845
    dst_y1 += dst->clip_rect.y;
slouken@9076
   846
philipp@9267
   847
    final_src.x = (int)SDL_floor(src_x0 + 0.5);
philipp@9267
   848
    final_src.y = (int)SDL_floor(src_y0 + 0.5);
slouken@10668
   849
    final_src.w = (int)SDL_floor(src_x1 + 1 + 0.5) - (int)SDL_floor(src_x0 + 0.5);
slouken@10668
   850
    final_src.h = (int)SDL_floor(src_y1 + 1 + 0.5) - (int)SDL_floor(src_y0 + 0.5);
slouken@9076
   851
philipp@9267
   852
    final_dst.x = (int)SDL_floor(dst_x0 + 0.5);
philipp@9267
   853
    final_dst.y = (int)SDL_floor(dst_y0 + 0.5);
philipp@9267
   854
    final_dst.w = (int)SDL_floor(dst_x1 - dst_x0 + 1.5);
philipp@9267
   855
    final_dst.h = (int)SDL_floor(dst_y1 - dst_y0 + 1.5);
slouken@9076
   856
slouken@9076
   857
    if (final_dst.w < 0)
slouken@9076
   858
        final_dst.w = 0;
slouken@9076
   859
    if (final_dst.h < 0)
slouken@9076
   860
        final_dst.h = 0;
slouken@9076
   861
slouken@9076
   862
    if (dstrect)
slouken@9076
   863
        *dstrect = final_dst;
slouken@9076
   864
slouken@9076
   865
    if (final_dst.w == 0 || final_dst.h == 0 ||
slouken@9076
   866
        final_src.w <= 0 || final_src.h <= 0) {
slouken@9076
   867
        /* No-op. */
slouken@9076
   868
        return 0;
slouken@9076
   869
    }
slouken@9076
   870
slouken@9076
   871
    return SDL_LowerBlitScaled(src, &final_src, dst, &final_dst);
ken@5499
   872
}
ken@5499
   873
ken@5499
   874
/**
ken@5499
   875
 *  This is a semi-private blit function and it performs low-level surface
ken@5499
   876
 *  scaled blitting only.
ken@5499
   877
 */
ken@5499
   878
int
ken@5499
   879
SDL_LowerBlitScaled(SDL_Surface * src, SDL_Rect * srcrect,
ken@5499
   880
                SDL_Surface * dst, SDL_Rect * dstrect)
ken@5296
   881
{
slouken@6526
   882
    static const Uint32 complex_copy_flags = (
slouken@6526
   883
        SDL_COPY_MODULATE_COLOR | SDL_COPY_MODULATE_ALPHA |
slouken@6526
   884
        SDL_COPY_BLEND | SDL_COPY_ADD | SDL_COPY_MOD |
slouken@6526
   885
        SDL_COPY_COLORKEY
slouken@6526
   886
    );
slouken@6526
   887
slouken@7834
   888
    if (!(src->map->info.flags & SDL_COPY_NEAREST)) {
slouken@7834
   889
        src->map->info.flags |= SDL_COPY_NEAREST;
slouken@7834
   890
        SDL_InvalidateMap(src->map);
slouken@7834
   891
    }
ken@5296
   892
slouken@6526
   893
    if ( !(src->map->info.flags & complex_copy_flags) &&
slouken@7191
   894
         src->format->format == dst->format->format &&
slouken@6526
   895
         !SDL_ISPIXELFORMAT_INDEXED(src->format->format) ) {
slouken@9076
   896
        return SDL_SoftStretch( src, srcrect, dst, dstrect );
ken@5296
   897
    } else {
slouken@9076
   898
        return SDL_LowerBlit( src, srcrect, dst, dstrect );
ken@5296
   899
    }
ken@5296
   900
}
ken@5296
   901
ken@5296
   902
/*
slouken@0
   903
 * Lock a surface to directly access the pixels
slouken@0
   904
 */
slouken@1895
   905
int
slouken@1895
   906
SDL_LockSurface(SDL_Surface * surface)
slouken@0
   907
{
slouken@1895
   908
    if (!surface->locked) {
slouken@1895
   909
        /* Perform the lock */
slouken@1895
   910
        if (surface->flags & SDL_RLEACCEL) {
slouken@1895
   911
            SDL_UnRLESurface(surface, 1);
slouken@1895
   912
            surface->flags |= SDL_RLEACCEL;     /* save accel'd state */
slouken@1895
   913
        }
slouken@1895
   914
    }
slouken@0
   915
slouken@1895
   916
    /* Increment the surface lock count, for recursive locks */
slouken@1895
   917
    ++surface->locked;
slouken@0
   918
slouken@1895
   919
    /* Ready to go.. */
slouken@1895
   920
    return (0);
slouken@0
   921
}
slouken@1895
   922
slouken@0
   923
/*
slouken@0
   924
 * Unlock a previously locked surface
slouken@0
   925
 */
slouken@1895
   926
void
slouken@1895
   927
SDL_UnlockSurface(SDL_Surface * surface)
slouken@0
   928
{
slouken@1895
   929
    /* Only perform an unlock if we are locked */
slouken@1895
   930
    if (!surface->locked || (--surface->locked > 0)) {
slouken@1895
   931
        return;
slouken@1895
   932
    }
slouken@0
   933
slouken@1895
   934
    /* Update RLE encoded surface with new data */
slouken@1895
   935
    if ((surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL) {
slouken@1895
   936
        surface->flags &= ~SDL_RLEACCEL;        /* stop lying */
slouken@1895
   937
        SDL_RLESurface(surface);
slouken@1895
   938
    }
slouken@0
   939
}
slouken@0
   940
slouken@7191
   941
/*
slouken@11289
   942
 * Creates a new surface identical to the existing surface
slouken@11289
   943
 */
slouken@11289
   944
SDL_Surface *
slouken@11289
   945
SDL_DuplicateSurface(SDL_Surface * surface)
slouken@11289
   946
{
slouken@11289
   947
    return SDL_ConvertSurface(surface, surface->format, surface->flags);
slouken@11289
   948
}
slouken@11289
   949
slouken@11289
   950
/*
slouken@0
   951
 * Convert a surface into the specified pixel format.
slouken@0
   952
 */
slouken@1895
   953
SDL_Surface *
icculus@7725
   954
SDL_ConvertSurface(SDL_Surface * surface, const SDL_PixelFormat * format,
slouken@2807
   955
                   Uint32 flags)
slouken@0
   956
{
slouken@1895
   957
    SDL_Surface *convert;
slouken@2266
   958
    Uint32 copy_flags;
slouken@7601
   959
    SDL_Color copy_color;
slouken@1895
   960
    SDL_Rect bounds;
sylvain@12584
   961
    int ret;
slouken@0
   962
slouken@11289
   963
    if (!surface) {
slouken@11289
   964
        SDL_InvalidParamError("surface");
slouken@11289
   965
        return NULL;
slouken@11289
   966
    }
slouken@11289
   967
    if (!format) {
slouken@11289
   968
        SDL_InvalidParamError("format");
slouken@11289
   969
        return NULL;
slouken@11289
   970
    }
slouken@11289
   971
slouken@1895
   972
    /* Check for empty destination palette! (results in empty image) */
slouken@1895
   973
    if (format->palette != NULL) {
slouken@1895
   974
        int i;
slouken@1895
   975
        for (i = 0; i < format->palette->ncolors; ++i) {
slouken@1895
   976
            if ((format->palette->colors[i].r != 0xFF) ||
slouken@1895
   977
                (format->palette->colors[i].g != 0xFF) ||
slouken@1895
   978
                (format->palette->colors[i].b != 0xFF))
slouken@1895
   979
                break;
slouken@1895
   980
        }
slouken@1895
   981
        if (i == format->palette->ncolors) {
slouken@1895
   982
            SDL_SetError("Empty destination palette");
slouken@1895
   983
            return (NULL);
slouken@1895
   984
        }
slouken@1895
   985
    }
slouken@0
   986
slouken@1895
   987
    /* Create a new surface with the desired format */
slouken@2807
   988
    convert = SDL_CreateRGBSurface(flags, surface->w, surface->h,
slouken@1895
   989
                                   format->BitsPerPixel, format->Rmask,
slouken@1895
   990
                                   format->Gmask, format->Bmask,
slouken@1895
   991
                                   format->Amask);
slouken@1895
   992
    if (convert == NULL) {
slouken@1895
   993
        return (NULL);
slouken@1895
   994
    }
slouken@264
   995
slouken@1895
   996
    /* Copy the palette if any */
slouken@1895
   997
    if (format->palette && convert->format->palette) {
slouken@1895
   998
        SDL_memcpy(convert->format->palette->colors,
slouken@1895
   999
                   format->palette->colors,
slouken@1895
  1000
                   format->palette->ncolors * sizeof(SDL_Color));
slouken@1895
  1001
        convert->format->palette->ncolors = format->palette->ncolors;
slouken@1895
  1002
    }
slouken@0
  1003
slouken@2266
  1004
    /* Save the original copy flags */
slouken@2266
  1005
    copy_flags = surface->map->info.flags;
slouken@7601
  1006
    copy_color.r = surface->map->info.r;
slouken@7601
  1007
    copy_color.g = surface->map->info.g;
slouken@7601
  1008
    copy_color.b = surface->map->info.b;
slouken@7601
  1009
    copy_color.a = surface->map->info.a;
slouken@7601
  1010
    surface->map->info.r = 0xFF;
slouken@7601
  1011
    surface->map->info.g = 0xFF;
slouken@7601
  1012
    surface->map->info.b = 0xFF;
slouken@7601
  1013
    surface->map->info.a = 0xFF;
slouken@2266
  1014
    surface->map->info.flags = 0;
slouken@7601
  1015
    SDL_InvalidateMap(surface->map);
slouken@0
  1016
slouken@1895
  1017
    /* Copy over the image data */
slouken@1895
  1018
    bounds.x = 0;
slouken@1895
  1019
    bounds.y = 0;
slouken@1895
  1020
    bounds.w = surface->w;
slouken@1895
  1021
    bounds.h = surface->h;
sylvain@12584
  1022
    ret = SDL_LowerBlit(surface, &bounds, convert, &bounds);
slouken@0
  1023
slouken@1895
  1024
    /* Clean up the original surface, and update converted surface */
slouken@7601
  1025
    convert->map->info.r = copy_color.r;
slouken@7601
  1026
    convert->map->info.g = copy_color.g;
slouken@7601
  1027
    convert->map->info.b = copy_color.b;
slouken@7601
  1028
    convert->map->info.a = copy_color.a;
slouken@2824
  1029
    convert->map->info.flags =
slouken@2824
  1030
        (copy_flags &
slouken@2824
  1031
         ~(SDL_COPY_COLORKEY | SDL_COPY_BLEND
slouken@2824
  1032
           | SDL_COPY_RLE_DESIRED | SDL_COPY_RLE_COLORKEY |
slouken@2824
  1033
           SDL_COPY_RLE_ALPHAKEY));
slouken@7601
  1034
    surface->map->info.r = copy_color.r;
slouken@7601
  1035
    surface->map->info.g = copy_color.g;
slouken@7601
  1036
    surface->map->info.b = copy_color.b;
slouken@7601
  1037
    surface->map->info.a = copy_color.a;
slouken@2824
  1038
    surface->map->info.flags = copy_flags;
slouken@7601
  1039
    SDL_InvalidateMap(surface->map);
sylvain@12584
  1040
sylvain@12584
  1041
    /* SDL_LowerBlit failed, and so the conversion */
sylvain@12584
  1042
    if (ret < 0) {
sylvain@12584
  1043
        SDL_FreeSurface(convert);
sylvain@12584
  1044
        return NULL;
sylvain@12584
  1045
    }
sylvain@12584
  1046
slouken@2266
  1047
    if (copy_flags & SDL_COPY_COLORKEY) {
slouken@7023
  1048
        SDL_bool set_colorkey_by_color = SDL_FALSE;
sylvain@12566
  1049
        SDL_bool ignore_alpha          = SDL_TRUE;  /* Ignore, or not, alpha in colorkey comparison */
slouken@2266
  1050
slouken@7023
  1051
        if (surface->format->palette) {
slouken@7191
  1052
            if (format->palette &&
slouken@7023
  1053
                surface->format->palette->ncolors <= format->palette->ncolors &&
slouken@7023
  1054
                (SDL_memcmp(surface->format->palette->colors, format->palette->colors,
slouken@7023
  1055
                  surface->format->palette->ncolors * sizeof(SDL_Color)) == 0)) {
slouken@7023
  1056
                /* The palette is identical, just set the same colorkey */
slouken@7023
  1057
                SDL_SetColorKey(convert, 1, surface->map->info.colorkey);
slouken@7023
  1058
            } else if (format->Amask) {
sylvain@12566
  1059
                set_colorkey_by_color = SDL_TRUE;
sylvain@12566
  1060
                ignore_alpha = SDL_FALSE;
slouken@7023
  1061
            } else {
slouken@7023
  1062
                set_colorkey_by_color = SDL_TRUE;
slouken@7023
  1063
            }
slouken@7023
  1064
        } else {
slouken@7023
  1065
            set_colorkey_by_color = SDL_TRUE;
slouken@7023
  1066
        }
slouken@7023
  1067
slouken@7023
  1068
        if (set_colorkey_by_color) {
slouken@11253
  1069
            SDL_Surface *tmp;
slouken@11253
  1070
            SDL_Surface *tmp2;
slouken@11253
  1071
            int converted_colorkey = 0;
slouken@7023
  1072
slouken@11253
  1073
            /* Create a dummy surface to get the colorkey converted */
slouken@11253
  1074
            tmp = SDL_CreateRGBSurface(0, 1, 1,
slouken@11253
  1075
                                   surface->format->BitsPerPixel, surface->format->Rmask,
slouken@11253
  1076
                                   surface->format->Gmask, surface->format->Bmask,
slouken@11253
  1077
                                   surface->format->Amask);
slouken@11253
  1078
icculus@11496
  1079
            /* Share the palette, if any */
icculus@11496
  1080
            if (surface->format->palette) {
icculus@11496
  1081
                SDL_SetSurfacePalette(tmp, surface->format->palette);
icculus@11496
  1082
            }
sylvain@12566
  1083
slouken@11253
  1084
            SDL_FillRect(tmp, NULL, surface->map->info.colorkey);
slouken@11253
  1085
slouken@11253
  1086
            tmp->map->info.flags &= ~SDL_COPY_COLORKEY;
slouken@11253
  1087
slouken@11253
  1088
            /* Convertion of the colorkey */
slouken@11253
  1089
            tmp2 = SDL_ConvertSurface(tmp, format, 0);
slouken@11253
  1090
slouken@11253
  1091
            /* Get the converted colorkey */
slouken@11254
  1092
            SDL_memcpy(&converted_colorkey, tmp2->pixels, tmp2->format->BytesPerPixel);
slouken@11253
  1093
slouken@11253
  1094
            SDL_FreeSurface(tmp);
slouken@11253
  1095
            SDL_FreeSurface(tmp2);
slouken@11253
  1096
slouken@11253
  1097
            /* Set the converted colorkey on the new surface */
slouken@11253
  1098
            SDL_SetColorKey(convert, 1, converted_colorkey);
slouken@11253
  1099
slouken@7023
  1100
            /* This is needed when converting for 3D texture upload */
sylvain@12566
  1101
            SDL_ConvertColorkeyToAlpha(convert, ignore_alpha);
slouken@7023
  1102
        }
slouken@1895
  1103
    }
slouken@2824
  1104
    SDL_SetClipRect(convert, &surface->clip_rect);
slouken@0
  1105
slouken@2266
  1106
    /* Enable alpha blending by default if the new surface has an
slouken@2266
  1107
     * alpha channel or alpha modulation */
slouken@2824
  1108
    if ((surface->format->Amask && format->Amask) ||
slouken@11246
  1109
        (copy_flags & SDL_COPY_MODULATE_ALPHA)) {
slouken@2884
  1110
        SDL_SetSurfaceBlendMode(convert, SDL_BLENDMODE_BLEND);
slouken@1895
  1111
    }
slouken@2824
  1112
    if ((copy_flags & SDL_COPY_RLE_DESIRED) || (flags & SDL_RLEACCEL)) {
slouken@2824
  1113
        SDL_SetSurfaceRLE(convert, SDL_RLEACCEL);
slouken@2824
  1114
    }
slouken@0
  1115
slouken@1895
  1116
    /* We're ready to go! */
slouken@1895
  1117
    return (convert);
slouken@0
  1118
}
slouken@0
  1119
slouken@5375
  1120
SDL_Surface *
slouken@5375
  1121
SDL_ConvertSurfaceFormat(SDL_Surface * surface, Uint32 pixel_format,
slouken@5375
  1122
                         Uint32 flags)
slouken@5375
  1123
{
slouken@5375
  1124
    SDL_PixelFormat *fmt;
slouken@5515
  1125
    SDL_Surface *convert = NULL;
slouken@5375
  1126
slouken@5375
  1127
    fmt = SDL_AllocFormat(pixel_format);
slouken@5375
  1128
    if (fmt) {
slouken@5375
  1129
        convert = SDL_ConvertSurface(surface, fmt, flags);
slouken@5375
  1130
        SDL_FreeFormat(fmt);
slouken@5375
  1131
    }
slouken@5375
  1132
    return convert;
slouken@5375
  1133
}
slouken@5375
  1134
slouken@0
  1135
/*
slouken@3434
  1136
 * Create a surface on the stack for quick blit operations
slouken@3434
  1137
 */
slouken@7860
  1138
static SDL_INLINE SDL_bool
slouken@3434
  1139
SDL_CreateSurfaceOnStack(int width, int height, Uint32 pixel_format,
slouken@7191
  1140
                         void * pixels, int pitch, SDL_Surface * surface,
slouken@3434
  1141
                         SDL_PixelFormat * format, SDL_BlitMap * blitmap)
slouken@3434
  1142
{
slouken@5288
  1143
    if (SDL_ISPIXELFORMAT_INDEXED(pixel_format)) {
slouken@5288
  1144
        SDL_SetError("Indexed pixel formats not supported");
slouken@3434
  1145
        return SDL_FALSE;
slouken@3434
  1146
    }
slouken@5288
  1147
    if (SDL_InitFormat(format, pixel_format) < 0) {
slouken@3434
  1148
        return SDL_FALSE;
slouken@3434
  1149
    }
slouken@3434
  1150
slouken@3434
  1151
    SDL_zerop(surface);
slouken@3434
  1152
    surface->flags = SDL_PREALLOC;
slouken@5288
  1153
    surface->format = format;
slouken@3434
  1154
    surface->pixels = pixels;
slouken@3434
  1155
    surface->w = width;
slouken@3434
  1156
    surface->h = height;
slouken@3434
  1157
    surface->pitch = pitch;
slouken@3434
  1158
    /* We don't actually need to set up the clip rect for our purposes */
gabomdq@7678
  1159
    /* SDL_SetClipRect(surface, NULL); */
slouken@3434
  1160
slouken@3434
  1161
    /* Allocate an empty mapping */
slouken@3434
  1162
    SDL_zerop(blitmap);
slouken@3434
  1163
    blitmap->info.r = 0xFF;
slouken@3434
  1164
    blitmap->info.g = 0xFF;
slouken@3434
  1165
    blitmap->info.b = 0xFF;
slouken@3434
  1166
    blitmap->info.a = 0xFF;
slouken@3434
  1167
    surface->map = blitmap;
slouken@3434
  1168
slouken@3434
  1169
    /* The surface is ready to go */
slouken@3434
  1170
    surface->refcount = 1;
slouken@3434
  1171
    return SDL_TRUE;
slouken@3434
  1172
}
slouken@3434
  1173
slouken@3434
  1174
/*
slouken@3434
  1175
 * Copy a block of pixels of one format to another format
slouken@3434
  1176
 */
slouken@3434
  1177
int SDL_ConvertPixels(int width, int height,
slouken@3434
  1178
                      Uint32 src_format, const void * src, int src_pitch,
slouken@3434
  1179
                      Uint32 dst_format, void * dst, int dst_pitch)
slouken@3434
  1180
{
slouken@3434
  1181
    SDL_Surface src_surface, dst_surface;
slouken@3434
  1182
    SDL_PixelFormat src_fmt, dst_fmt;
slouken@3434
  1183
    SDL_BlitMap src_blitmap, dst_blitmap;
slouken@3434
  1184
    SDL_Rect rect;
icculus@6407
  1185
    void *nonconst_src = (void *) src;
slouken@3434
  1186
slouken@9046
  1187
    /* Check to make sure we are blitting somewhere, so we don't crash */
slouken@6920
  1188
    if (!dst) {
icculus@7037
  1189
        return SDL_InvalidParamError("dst");
slouken@6920
  1190
    }
slouken@6920
  1191
    if (!dst_pitch) {
icculus@7037
  1192
        return SDL_InvalidParamError("dst_pitch");
slouken@6920
  1193
    }
slouken@6920
  1194
slouken@11702
  1195
    if (SDL_ISPIXELFORMAT_FOURCC(src_format) && SDL_ISPIXELFORMAT_FOURCC(dst_format)) {
slouken@11702
  1196
        return SDL_ConvertPixels_YUV_to_YUV(width, height, src_format, src, src_pitch, dst_format, dst, dst_pitch);
slouken@11702
  1197
    } else if (SDL_ISPIXELFORMAT_FOURCC(src_format)) {
slouken@11702
  1198
        return SDL_ConvertPixels_YUV_to_RGB(width, height, src_format, src, src_pitch, dst_format, dst, dst_pitch);
slouken@11702
  1199
    } else if (SDL_ISPIXELFORMAT_FOURCC(dst_format)) {
slouken@11702
  1200
        return SDL_ConvertPixels_RGB_to_YUV(width, height, src_format, src, src_pitch, dst_format, dst, dst_pitch);
slouken@11702
  1201
    }
slouken@11702
  1202
slouken@3434
  1203
    /* Fast path for same format copy */
slouken@3434
  1204
    if (src_format == dst_format) {
slouken@11574
  1205
        int i;
slouken@11702
  1206
        const int bpp = SDL_BYTESPERPIXEL(src_format);
slouken@11702
  1207
        width *= bpp;
slouken@11702
  1208
        for (i = height; i--;) {
slouken@11702
  1209
            SDL_memcpy(dst, src, width);
slouken@11702
  1210
            src = (const Uint8*)src + src_pitch;
slouken@11702
  1211
            dst = (Uint8*)dst + dst_pitch;
slouken@9046
  1212
        }
slouken@6041
  1213
        return 0;
slouken@3434
  1214
    }
slouken@3434
  1215
icculus@6407
  1216
    if (!SDL_CreateSurfaceOnStack(width, height, src_format, nonconst_src,
slouken@3434
  1217
                                  src_pitch,
slouken@3434
  1218
                                  &src_surface, &src_fmt, &src_blitmap)) {
slouken@3434
  1219
        return -1;
slouken@3434
  1220
    }
slouken@3434
  1221
    if (!SDL_CreateSurfaceOnStack(width, height, dst_format, dst, dst_pitch,
slouken@3434
  1222
                                  &dst_surface, &dst_fmt, &dst_blitmap)) {
slouken@3434
  1223
        return -1;
slouken@3434
  1224
    }
slouken@3434
  1225
slouken@3434
  1226
    /* Set up the rect and go! */
slouken@3434
  1227
    rect.x = 0;
slouken@3434
  1228
    rect.y = 0;
slouken@3434
  1229
    rect.w = width;
slouken@3436
  1230
    rect.h = height;
slouken@3434
  1231
    return SDL_LowerBlit(&src_surface, &rect, &dst_surface, &rect);
slouken@3434
  1232
}
slouken@3434
  1233
slouken@3434
  1234
/*
slouken@0
  1235
 * Free a surface created by the above function.
slouken@0
  1236
 */
slouken@1895
  1237
void
slouken@1895
  1238
SDL_FreeSurface(SDL_Surface * surface)
slouken@0
  1239
{
slouken@1895
  1240
    if (surface == NULL) {
slouken@1895
  1241
        return;
slouken@1895
  1242
    }
slouken@5288
  1243
    if (surface->flags & SDL_DONTFREE) {
slouken@5288
  1244
        return;
slouken@5288
  1245
    }
slouken@11551
  1246
    SDL_InvalidateMap(surface->map);
slouken@11551
  1247
slouken@1895
  1248
    if (--surface->refcount > 0) {
slouken@1895
  1249
        return;
slouken@1895
  1250
    }
slouken@1895
  1251
    while (surface->locked > 0) {
slouken@1895
  1252
        SDL_UnlockSurface(surface);
slouken@1895
  1253
    }
slouken@1895
  1254
    if (surface->flags & SDL_RLEACCEL) {
slouken@1895
  1255
        SDL_UnRLESurface(surface, 0);
slouken@1895
  1256
    }
slouken@1895
  1257
    if (surface->format) {
slouken@1895
  1258
        SDL_SetSurfacePalette(surface, NULL);
slouken@1895
  1259
        SDL_FreeFormat(surface->format);
slouken@1895
  1260
        surface->format = NULL;
slouken@1895
  1261
    }
sylvain@12587
  1262
    if (surface->flags & SDL_PREALLOC) {
sylvain@12587
  1263
        /* Don't free */
sylvain@12589
  1264
    } else if (surface->flags & SDL_SIMD_ALIGNED) {
sylvain@12587
  1265
        /* Free aligned */
sylvain@12587
  1266
        SDL_SIMDFree(surface->pixels);
sylvain@12587
  1267
    } else {
sylvain@12587
  1268
        /* Normal */
slouken@1895
  1269
        SDL_free(surface->pixels);
slouken@1895
  1270
    }
brandon@11563
  1271
    if (surface->map) {
brandon@11563
  1272
        SDL_FreeBlitMap(surface->map);
brandon@11563
  1273
    }
slouken@1895
  1274
    SDL_free(surface);
slouken@0
  1275
}
slouken@1895
  1276
slouken@1895
  1277
/* vi: set ts=4 sw=4 expandtab: */