src/video/SDL_surface.c
author Sylvain Becker <sylvain.becker@gmail.com>
Wed, 30 Jan 2019 16:36:47 +0100
changeset 12584 233b2a61cad1
parent 12566 884f99b039f0
child 12587 b2d4dcb4ba33
permissions -rw-r--r--
Fixed failing SDL_ConvertSurface() when blit has failed.

Some blit combination are not supported (eg ARGB8888 -> SDL_PIXELFORMAT_INDEX1MSB)
So prevent SDL_ConvertSurface from creating a broken surface, which cannot be blitted
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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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/* 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
    if (!surface) {
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        return;
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    }
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   321
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   322
    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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slouken@2786
   327
    SDL_LockSurface(surface);
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   328
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   329
    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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sylvain@12566
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            /* Ignore, or not, alpha in colorkey comparison */
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            if (ignore_alpha) {
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                ckey &= mask;
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                row = (Uint16 *) surface->pixels;
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                for (y = surface->h; y--;) {
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                    spot = row;
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                    for (x = surface->w; x--;) {
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   343
                        if ((*spot & mask) == ckey) {
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   344
                            *spot &= mask;
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   345
                        }
sylvain@12566
   346
                        ++spot;
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                    }
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   348
                    row += surface->pitch / 2;
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   349
                }
sylvain@12566
   350
            } else {
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                row = (Uint16 *) surface->pixels;
sylvain@12566
   352
                for (y = surface->h; y--;) {
sylvain@12566
   353
                    spot = row;
sylvain@12566
   354
                    for (x = surface->w; x--;) {
sylvain@12566
   355
                        if (*spot == ckey) {
sylvain@12566
   356
                            *spot &= mask;
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   357
                        }
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   358
                        ++spot;
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   359
                    }
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   360
                    row += surface->pitch / 2;
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   361
                }
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   362
            }
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   363
        }
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   364
        break;
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    case 3:
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        /* FIXME */
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   367
        break;
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   368
    case 4:
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   369
        {
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   370
            Uint32 *row, *spot;
slouken@2786
   371
            Uint32 ckey = surface->map->info.colorkey;
slouken@2786
   372
            Uint32 mask = ~surface->format->Amask;
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   373
sylvain@12566
   374
            /* Ignore, or not, alpha in colorkey comparison */
sylvain@12566
   375
            if (ignore_alpha) {
sylvain@12566
   376
                ckey &= mask;
sylvain@12566
   377
                row = (Uint32 *) surface->pixels;
sylvain@12566
   378
                for (y = surface->h; y--;) {
sylvain@12566
   379
                    spot = row;
sylvain@12566
   380
                    for (x = surface->w; x--;) {
sylvain@12566
   381
                        if ((*spot & mask) == ckey) {
sylvain@12566
   382
                            *spot &= mask;
sylvain@12566
   383
                        }
sylvain@12566
   384
                        ++spot;
slouken@2786
   385
                    }
sylvain@12566
   386
                    row += surface->pitch / 4;
slouken@2786
   387
                }
sylvain@12566
   388
            } else {
sylvain@12566
   389
                row = (Uint32 *) surface->pixels;
sylvain@12566
   390
                for (y = surface->h; y--;) {
sylvain@12566
   391
                    spot = row;
sylvain@12566
   392
                    for (x = surface->w; x--;) {
sylvain@12566
   393
                        if (*spot == ckey) {
sylvain@12566
   394
                            *spot &= mask;
sylvain@12566
   395
                        }
sylvain@12566
   396
                        ++spot;
sylvain@12566
   397
                    }
sylvain@12566
   398
                    row += surface->pitch / 4;
sylvain@12566
   399
                }
slouken@2786
   400
            }
slouken@2786
   401
        }
slouken@2786
   402
        break;
slouken@2786
   403
    }
slouken@2785
   404
slouken@2786
   405
    SDL_UnlockSurface(surface);
slouken@2785
   406
slouken@2786
   407
    SDL_SetColorKey(surface, 0, 0);
slouken@2884
   408
    SDL_SetSurfaceBlendMode(surface, SDL_BLENDMODE_BLEND);
slouken@2785
   409
}
slouken@2785
   410
slouken@2267
   411
int
slouken@2267
   412
SDL_SetSurfaceColorMod(SDL_Surface * surface, Uint8 r, Uint8 g, Uint8 b)
slouken@2266
   413
{
slouken@2266
   414
    int flags;
slouken@2266
   415
slouken@2266
   416
    if (!surface) {
slouken@2266
   417
        return -1;
slouken@2266
   418
    }
slouken@2266
   419
slouken@2266
   420
    surface->map->info.r = r;
slouken@2266
   421
    surface->map->info.g = g;
slouken@2266
   422
    surface->map->info.b = b;
slouken@2266
   423
slouken@2266
   424
    flags = surface->map->info.flags;
slouken@2266
   425
    if (r != 0xFF || g != 0xFF || b != 0xFF) {
slouken@2266
   426
        surface->map->info.flags |= SDL_COPY_MODULATE_COLOR;
slouken@2266
   427
    } else {
slouken@2266
   428
        surface->map->info.flags &= ~SDL_COPY_MODULATE_COLOR;
slouken@2266
   429
    }
slouken@2266
   430
    if (surface->map->info.flags != flags) {
slouken@2266
   431
        SDL_InvalidateMap(surface->map);
slouken@2266
   432
    }
slouken@2266
   433
    return 0;
slouken@2266
   434
}
slouken@2266
   435
slouken@2266
   436
slouken@2267
   437
int
slouken@2267
   438
SDL_GetSurfaceColorMod(SDL_Surface * surface, Uint8 * r, Uint8 * g, Uint8 * b)
slouken@2266
   439
{
slouken@2266
   440
    if (!surface) {
slouken@2266
   441
        return -1;
slouken@2266
   442
    }
slouken@2266
   443
slouken@2266
   444
    if (r) {
slouken@2266
   445
        *r = surface->map->info.r;
slouken@2266
   446
    }
slouken@2266
   447
    if (g) {
slouken@2266
   448
        *g = surface->map->info.g;
slouken@2266
   449
    }
slouken@2266
   450
    if (b) {
slouken@2266
   451
        *b = surface->map->info.b;
slouken@2266
   452
    }
slouken@2266
   453
    return 0;
slouken@2266
   454
}
slouken@2266
   455
slouken@2267
   456
int
slouken@2267
   457
SDL_SetSurfaceAlphaMod(SDL_Surface * surface, Uint8 alpha)
slouken@2266
   458
{
slouken@2266
   459
    int flags;
slouken@2266
   460
slouken@2266
   461
    if (!surface) {
slouken@2266
   462
        return -1;
slouken@2266
   463
    }
slouken@2266
   464
slouken@2266
   465
    surface->map->info.a = alpha;
slouken@2266
   466
slouken@2266
   467
    flags = surface->map->info.flags;
slouken@2266
   468
    if (alpha != 0xFF) {
slouken@2266
   469
        surface->map->info.flags |= SDL_COPY_MODULATE_ALPHA;
slouken@2266
   470
    } else {
slouken@2266
   471
        surface->map->info.flags &= ~SDL_COPY_MODULATE_ALPHA;
slouken@2266
   472
    }
slouken@2266
   473
    if (surface->map->info.flags != flags) {
slouken@2266
   474
        SDL_InvalidateMap(surface->map);
slouken@2266
   475
    }
slouken@2266
   476
    return 0;
slouken@2266
   477
}
slouken@2266
   478
slouken@2267
   479
int
slouken@2267
   480
SDL_GetSurfaceAlphaMod(SDL_Surface * surface, Uint8 * alpha)
slouken@2266
   481
{
slouken@2266
   482
    if (!surface) {
slouken@2266
   483
        return -1;
slouken@2266
   484
    }
slouken@2266
   485
slouken@2266
   486
    if (alpha) {
slouken@2266
   487
        *alpha = surface->map->info.a;
slouken@2266
   488
    }
slouken@2266
   489
    return 0;
slouken@2266
   490
}
slouken@2266
   491
slouken@2267
   492
int
slouken@4929
   493
SDL_SetSurfaceBlendMode(SDL_Surface * surface, SDL_BlendMode blendMode)
slouken@2266
   494
{
slouken@2266
   495
    int flags, status;
slouken@2266
   496
slouken@2266
   497
    if (!surface) {
slouken@2266
   498
        return -1;
slouken@2266
   499
    }
slouken@2266
   500
slouken@2266
   501
    status = 0;
slouken@2266
   502
    flags = surface->map->info.flags;
slouken@5184
   503
    surface->map->info.flags &=
slouken@5184
   504
        ~(SDL_COPY_BLEND | SDL_COPY_ADD | SDL_COPY_MOD);
slouken@2266
   505
    switch (blendMode) {
slouken@2884
   506
    case SDL_BLENDMODE_NONE:
slouken@2266
   507
        break;
slouken@2884
   508
    case SDL_BLENDMODE_BLEND:
slouken@2266
   509
        surface->map->info.flags |= SDL_COPY_BLEND;
slouken@2266
   510
        break;
slouken@2884
   511
    case SDL_BLENDMODE_ADD:
slouken@2266
   512
        surface->map->info.flags |= SDL_COPY_ADD;
slouken@2266
   513
        break;
slouken@5184
   514
    case SDL_BLENDMODE_MOD:
slouken@5184
   515
        surface->map->info.flags |= SDL_COPY_MOD;
slouken@5184
   516
        break;
slouken@2266
   517
    default:
icculus@7037
   518
        status = SDL_Unsupported();
slouken@2266
   519
        break;
slouken@2266
   520
    }
slouken@2266
   521
slouken@2266
   522
    if (surface->map->info.flags != flags) {
slouken@2266
   523
        SDL_InvalidateMap(surface->map);
slouken@2266
   524
    }
slouken@2267
   525
slouken@2266
   526
    return status;
slouken@2266
   527
}
slouken@2266
   528
slouken@2267
   529
int
slouken@4929
   530
SDL_GetSurfaceBlendMode(SDL_Surface * surface, SDL_BlendMode *blendMode)
slouken@2266
   531
{
slouken@2266
   532
    if (!surface) {
slouken@2266
   533
        return -1;
slouken@2266
   534
    }
slouken@2266
   535
slouken@2266
   536
    if (!blendMode) {
slouken@2266
   537
        return 0;
slouken@2266
   538
    }
slouken@2266
   539
slouken@5184
   540
    switch (surface->map->
slouken@5184
   541
            info.flags & (SDL_COPY_BLEND | SDL_COPY_ADD | SDL_COPY_MOD)) {
slouken@2266
   542
    case SDL_COPY_BLEND:
slouken@2884
   543
        *blendMode = SDL_BLENDMODE_BLEND;
slouken@2266
   544
        break;
slouken@2266
   545
    case SDL_COPY_ADD:
slouken@2884
   546
        *blendMode = SDL_BLENDMODE_ADD;
slouken@2266
   547
        break;
slouken@5184
   548
    case SDL_COPY_MOD:
slouken@5184
   549
        *blendMode = SDL_BLENDMODE_MOD;
slouken@5184
   550
        break;
slouken@2266
   551
    default:
slouken@2884
   552
        *blendMode = SDL_BLENDMODE_NONE;
slouken@2266
   553
        break;
slouken@2266
   554
    }
slouken@2266
   555
    return 0;
slouken@2266
   556
}
slouken@2266
   557
slouken@1895
   558
SDL_bool
slouken@1895
   559
SDL_SetClipRect(SDL_Surface * surface, const SDL_Rect * rect)
slouken@0
   560
{
slouken@1895
   561
    SDL_Rect full_rect;
slouken@0
   562
slouken@1895
   563
    /* Don't do anything if there's no surface to act on */
slouken@1895
   564
    if (!surface) {
slouken@1895
   565
        return SDL_FALSE;
slouken@1895
   566
    }
slouken@0
   567
slouken@1895
   568
    /* Set up the full surface rectangle */
slouken@1895
   569
    full_rect.x = 0;
slouken@1895
   570
    full_rect.y = 0;
slouken@1895
   571
    full_rect.w = surface->w;
slouken@1895
   572
    full_rect.h = surface->h;
slouken@0
   573
slouken@1895
   574
    /* Set the clipping rectangle */
slouken@1895
   575
    if (!rect) {
slouken@1895
   576
        surface->clip_rect = full_rect;
slouken@4966
   577
        return SDL_TRUE;
slouken@1895
   578
    }
slouken@1895
   579
    return SDL_IntersectRect(rect, &full_rect, &surface->clip_rect);
slouken@0
   580
}
slouken@1895
   581
slouken@1895
   582
void
slouken@1895
   583
SDL_GetClipRect(SDL_Surface * surface, SDL_Rect * rect)
slouken@0
   584
{
slouken@1895
   585
    if (surface && rect) {
slouken@1895
   586
        *rect = surface->clip_rect;
slouken@1895
   587
    }
slouken@0
   588
}
slouken@1895
   589
slouken@7191
   590
/*
slouken@0
   591
 * Set up a blit between two surfaces -- split into three parts:
slouken@7191
   592
 * The upper part, SDL_UpperBlit(), performs clipping and rectangle
slouken@0
   593
 * verification.  The lower part is a pointer to a low level
slouken@0
   594
 * accelerated blitting function.
slouken@0
   595
 *
slouken@7191
   596
 * These parts are separated out and each used internally by this
slouken@0
   597
 * library in the optimimum places.  They are exported so that if
slouken@0
   598
 * you know exactly what you are doing, you can optimize your code
slouken@0
   599
 * by calling the one(s) you need.
slouken@0
   600
 */
slouken@1895
   601
int
slouken@1895
   602
SDL_LowerBlit(SDL_Surface * src, SDL_Rect * srcrect,
slouken@1895
   603
              SDL_Surface * dst, SDL_Rect * dstrect)
slouken@0
   604
{
slouken@1895
   605
    /* Check to make sure the blit mapping is valid */
slouken@1895
   606
    if ((src->map->dst != dst) ||
slouken@5288
   607
        (dst->format->palette &&
slouken@6166
   608
         src->map->dst_palette_version != dst->format->palette->version) ||
slouken@6166
   609
        (src->format->palette &&
slouken@6166
   610
         src->map->src_palette_version != src->format->palette->version)) {
slouken@1895
   611
        if (SDL_MapSurface(src, dst) < 0) {
slouken@1895
   612
            return (-1);
slouken@1895
   613
        }
bob@2328
   614
        /* just here for debugging */
bob@2329
   615
/*         printf */
bob@2329
   616
/*             ("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
   617
/*              src, dst->flags, src->map->info.flags, dst, dst->flags, */
bob@2329
   618
/*              dst->map->info.flags, src->map->blit); */
slouken@1895
   619
    }
slouken@2257
   620
    return (src->map->blit(src, srcrect, dst, dstrect));
slouken@0
   621
}
slouken@0
   622
slouken@0
   623
slouken@1895
   624
int
slouken@4949
   625
SDL_UpperBlit(SDL_Surface * src, const SDL_Rect * srcrect,
slouken@1895
   626
              SDL_Surface * dst, SDL_Rect * dstrect)
slouken@0
   627
{
slouken@1895
   628
    SDL_Rect fulldst;
slouken@1895
   629
    int srcx, srcy, w, h;
slouken@0
   630
slouken@1895
   631
    /* Make sure the surfaces aren't locked */
slouken@1895
   632
    if (!src || !dst) {
icculus@7037
   633
        return SDL_SetError("SDL_UpperBlit: passed a NULL surface");
slouken@1895
   634
    }
slouken@1895
   635
    if (src->locked || dst->locked) {
icculus@7037
   636
        return SDL_SetError("Surfaces must not be locked during blit");
slouken@1895
   637
    }
slouken@0
   638
slouken@1895
   639
    /* If the destination rectangle is NULL, use the entire dest surface */
slouken@1895
   640
    if (dstrect == NULL) {
slouken@1895
   641
        fulldst.x = fulldst.y = 0;
slouken@7511
   642
        fulldst.w = dst->w;
slouken@7511
   643
        fulldst.h = dst->h;
slouken@1895
   644
        dstrect = &fulldst;
slouken@1895
   645
    }
slouken@0
   646
slouken@1895
   647
    /* clip the source rectangle to the source surface */
slouken@1895
   648
    if (srcrect) {
slouken@1895
   649
        int maxw, maxh;
slouken@0
   650
slouken@1895
   651
        srcx = srcrect->x;
slouken@1895
   652
        w = srcrect->w;
slouken@1895
   653
        if (srcx < 0) {
slouken@1895
   654
            w += srcx;
slouken@1895
   655
            dstrect->x -= srcx;
slouken@1895
   656
            srcx = 0;
slouken@1895
   657
        }
slouken@1895
   658
        maxw = src->w - srcx;
slouken@1895
   659
        if (maxw < w)
slouken@1895
   660
            w = maxw;
slouken@0
   661
slouken@1895
   662
        srcy = srcrect->y;
slouken@1895
   663
        h = srcrect->h;
slouken@1895
   664
        if (srcy < 0) {
slouken@1895
   665
            h += srcy;
slouken@1895
   666
            dstrect->y -= srcy;
slouken@1895
   667
            srcy = 0;
slouken@1895
   668
        }
slouken@1895
   669
        maxh = src->h - srcy;
slouken@1895
   670
        if (maxh < h)
slouken@1895
   671
            h = maxh;
slouken@0
   672
slouken@1895
   673
    } else {
slouken@1895
   674
        srcx = srcy = 0;
slouken@1895
   675
        w = src->w;
slouken@1895
   676
        h = src->h;
slouken@1895
   677
    }
slouken@0
   678
slouken@1895
   679
    /* clip the destination rectangle against the clip rectangle */
slouken@1895
   680
    {
slouken@1895
   681
        SDL_Rect *clip = &dst->clip_rect;
slouken@1895
   682
        int dx, dy;
slouken@0
   683
slouken@1895
   684
        dx = clip->x - dstrect->x;
slouken@1895
   685
        if (dx > 0) {
slouken@1895
   686
            w -= dx;
slouken@1895
   687
            dstrect->x += dx;
slouken@1895
   688
            srcx += dx;
slouken@1895
   689
        }
slouken@1895
   690
        dx = dstrect->x + w - clip->x - clip->w;
slouken@1895
   691
        if (dx > 0)
slouken@1895
   692
            w -= dx;
slouken@1895
   693
slouken@1895
   694
        dy = clip->y - dstrect->y;
slouken@1895
   695
        if (dy > 0) {
slouken@1895
   696
            h -= dy;
slouken@1895
   697
            dstrect->y += dy;
slouken@1895
   698
            srcy += dy;
slouken@1895
   699
        }
slouken@1895
   700
        dy = dstrect->y + h - clip->y - clip->h;
slouken@1895
   701
        if (dy > 0)
slouken@1895
   702
            h -= dy;
slouken@1895
   703
    }
slouken@1895
   704
slouken@7834
   705
    /* Switch back to a fast blit if we were previously stretching */
slouken@7834
   706
    if (src->map->info.flags & SDL_COPY_NEAREST) {
slouken@7834
   707
        src->map->info.flags &= ~SDL_COPY_NEAREST;
slouken@7834
   708
        SDL_InvalidateMap(src->map);
slouken@7834
   709
    }
slouken@7834
   710
slouken@1895
   711
    if (w > 0 && h > 0) {
slouken@1895
   712
        SDL_Rect sr;
slouken@1895
   713
        sr.x = srcx;
slouken@1895
   714
        sr.y = srcy;
slouken@1895
   715
        sr.w = dstrect->w = w;
slouken@1895
   716
        sr.h = dstrect->h = h;
slouken@1895
   717
        return SDL_LowerBlit(src, &sr, dst, dstrect);
slouken@1895
   718
    }
slouken@1895
   719
    dstrect->w = dstrect->h = 0;
slouken@1895
   720
    return 0;
slouken@0
   721
}
slouken@0
   722
ken@5296
   723
int
ken@5499
   724
SDL_UpperBlitScaled(SDL_Surface * src, const SDL_Rect * srcrect,
ken@5499
   725
              SDL_Surface * dst, SDL_Rect * dstrect)
ken@5499
   726
{
slouken@9076
   727
    double src_x0, src_y0, src_x1, src_y1;
slouken@9076
   728
    double dst_x0, dst_y0, dst_x1, dst_y1;
slouken@9076
   729
    SDL_Rect final_src, final_dst;
slouken@9076
   730
    double scaling_w, scaling_h;
slouken@9076
   731
    int src_w, src_h;
slouken@9076
   732
    int dst_w, dst_h;
ken@5499
   733
ken@5499
   734
    /* Make sure the surfaces aren't locked */
ken@5499
   735
    if (!src || !dst) {
icculus@7037
   736
        return SDL_SetError("SDL_UpperBlitScaled: passed a NULL surface");
ken@5499
   737
    }
ken@5499
   738
    if (src->locked || dst->locked) {
icculus@7037
   739
        return SDL_SetError("Surfaces must not be locked during blit");
ken@5499
   740
    }
ken@5499
   741
slouken@9076
   742
    if (NULL == srcrect) {
slouken@9076
   743
        src_w = src->w;
slouken@9076
   744
        src_h = src->h;
slouken@9076
   745
    } else {
slouken@9076
   746
        src_w = srcrect->w;
slouken@9076
   747
        src_h = srcrect->h;
ken@5499
   748
    }
ken@5499
   749
slouken@9076
   750
    if (NULL == dstrect) {
slouken@9076
   751
        dst_w = dst->w;
slouken@9076
   752
        dst_h = dst->h;
ken@5499
   753
    } else {
slouken@9076
   754
        dst_w = dstrect->w;
slouken@9076
   755
        dst_h = dstrect->h;
ken@5499
   756
    }
ken@5499
   757
slouken@9076
   758
    if (dst_w == src_w && dst_h == src_h) {
slouken@9076
   759
        /* No scaling, defer to regular blit */
slouken@9076
   760
        return SDL_BlitSurface(src, srcrect, dst, dstrect);
ken@5499
   761
    }
ken@5499
   762
slouken@9076
   763
    scaling_w = (double)dst_w / src_w;
slouken@9076
   764
    scaling_h = (double)dst_h / src_h;
slouken@9076
   765
slouken@9076
   766
    if (NULL == dstrect) {
slouken@9076
   767
        dst_x0 = 0;
slouken@9076
   768
        dst_y0 = 0;
slouken@9076
   769
        dst_x1 = dst_w - 1;
slouken@9076
   770
        dst_y1 = dst_h - 1;
slouken@9076
   771
    } else {
slouken@9076
   772
        dst_x0 = dstrect->x;
slouken@9076
   773
        dst_y0 = dstrect->y;
slouken@9076
   774
        dst_x1 = dst_x0 + dst_w - 1;
slouken@9076
   775
        dst_y1 = dst_y0 + dst_h - 1;
ken@5499
   776
    }
ken@5499
   777
slouken@9076
   778
    if (NULL == srcrect) {
slouken@9076
   779
        src_x0 = 0;
slouken@9076
   780
        src_y0 = 0;
slouken@9076
   781
        src_x1 = src_w - 1;
slouken@9076
   782
        src_y1 = src_h - 1;
slouken@9076
   783
    } else {
slouken@9076
   784
        src_x0 = srcrect->x;
slouken@9076
   785
        src_y0 = srcrect->y;
slouken@9076
   786
        src_x1 = src_x0 + src_w - 1;
slouken@9076
   787
        src_y1 = src_y0 + src_h - 1;
slouken@9076
   788
slouken@9076
   789
        /* Clip source rectangle to the source surface */
slouken@9076
   790
slouken@9076
   791
        if (src_x0 < 0) {
slouken@9076
   792
            dst_x0 -= src_x0 * scaling_w;
slouken@9076
   793
            src_x0 = 0;
slouken@9076
   794
        }
slouken@9076
   795
slouken@9076
   796
        if (src_x1 >= src->w) {
slouken@9076
   797
            dst_x1 -= (src_x1 - src->w + 1) * scaling_w;
slouken@9076
   798
            src_x1 = src->w - 1;
slouken@9076
   799
        }
slouken@9076
   800
slouken@9076
   801
        if (src_y0 < 0) {
slouken@9076
   802
            dst_y0 -= src_y0 * scaling_h;
slouken@9076
   803
            src_y0 = 0;
slouken@9076
   804
        }
slouken@9076
   805
slouken@9076
   806
        if (src_y1 >= src->h) {
slouken@9076
   807
            dst_y1 -= (src_y1 - src->h + 1) * scaling_h;
slouken@9076
   808
            src_y1 = src->h - 1;
slouken@9076
   809
        }
slouken@9076
   810
    }
slouken@9076
   811
slouken@9076
   812
    /* Clip destination rectangle to the clip rectangle */
slouken@9076
   813
slouken@9076
   814
    /* Translate to clip space for easier calculations */
slouken@9076
   815
    dst_x0 -= dst->clip_rect.x;
slouken@9076
   816
    dst_x1 -= dst->clip_rect.x;
slouken@9076
   817
    dst_y0 -= dst->clip_rect.y;
slouken@9076
   818
    dst_y1 -= dst->clip_rect.y;
slouken@9076
   819
slouken@9076
   820
    if (dst_x0 < 0) {
slouken@9076
   821
        src_x0 -= dst_x0 / scaling_w;
slouken@9076
   822
        dst_x0 = 0;
slouken@9076
   823
    }
slouken@9076
   824
slouken@9076
   825
    if (dst_x1 >= dst->clip_rect.w) {
slouken@9076
   826
        src_x1 -= (dst_x1 - dst->clip_rect.w + 1) / scaling_w;
slouken@9076
   827
        dst_x1 = dst->clip_rect.w - 1;
slouken@9076
   828
    }
slouken@9076
   829
slouken@9076
   830
    if (dst_y0 < 0) {
slouken@9076
   831
        src_y0 -= dst_y0 / scaling_h;
slouken@9076
   832
        dst_y0 = 0;
slouken@9076
   833
    }
slouken@9076
   834
slouken@9076
   835
    if (dst_y1 >= dst->clip_rect.h) {
slouken@9076
   836
        src_y1 -= (dst_y1 - dst->clip_rect.h + 1) / scaling_h;
slouken@9076
   837
        dst_y1 = dst->clip_rect.h - 1;
slouken@9076
   838
    }
slouken@9076
   839
slouken@9076
   840
    /* Translate back to surface coordinates */
slouken@9076
   841
    dst_x0 += dst->clip_rect.x;
slouken@9076
   842
    dst_x1 += dst->clip_rect.x;
slouken@9076
   843
    dst_y0 += dst->clip_rect.y;
slouken@9076
   844
    dst_y1 += dst->clip_rect.y;
slouken@9076
   845
philipp@9267
   846
    final_src.x = (int)SDL_floor(src_x0 + 0.5);
philipp@9267
   847
    final_src.y = (int)SDL_floor(src_y0 + 0.5);
slouken@10668
   848
    final_src.w = (int)SDL_floor(src_x1 + 1 + 0.5) - (int)SDL_floor(src_x0 + 0.5);
slouken@10668
   849
    final_src.h = (int)SDL_floor(src_y1 + 1 + 0.5) - (int)SDL_floor(src_y0 + 0.5);
slouken@9076
   850
philipp@9267
   851
    final_dst.x = (int)SDL_floor(dst_x0 + 0.5);
philipp@9267
   852
    final_dst.y = (int)SDL_floor(dst_y0 + 0.5);
philipp@9267
   853
    final_dst.w = (int)SDL_floor(dst_x1 - dst_x0 + 1.5);
philipp@9267
   854
    final_dst.h = (int)SDL_floor(dst_y1 - dst_y0 + 1.5);
slouken@9076
   855
slouken@9076
   856
    if (final_dst.w < 0)
slouken@9076
   857
        final_dst.w = 0;
slouken@9076
   858
    if (final_dst.h < 0)
slouken@9076
   859
        final_dst.h = 0;
slouken@9076
   860
slouken@9076
   861
    if (dstrect)
slouken@9076
   862
        *dstrect = final_dst;
slouken@9076
   863
slouken@9076
   864
    if (final_dst.w == 0 || final_dst.h == 0 ||
slouken@9076
   865
        final_src.w <= 0 || final_src.h <= 0) {
slouken@9076
   866
        /* No-op. */
slouken@9076
   867
        return 0;
slouken@9076
   868
    }
slouken@9076
   869
slouken@9076
   870
    return SDL_LowerBlitScaled(src, &final_src, dst, &final_dst);
ken@5499
   871
}
ken@5499
   872
ken@5499
   873
/**
ken@5499
   874
 *  This is a semi-private blit function and it performs low-level surface
ken@5499
   875
 *  scaled blitting only.
ken@5499
   876
 */
ken@5499
   877
int
ken@5499
   878
SDL_LowerBlitScaled(SDL_Surface * src, SDL_Rect * srcrect,
ken@5499
   879
                SDL_Surface * dst, SDL_Rect * dstrect)
ken@5296
   880
{
slouken@6526
   881
    static const Uint32 complex_copy_flags = (
slouken@6526
   882
        SDL_COPY_MODULATE_COLOR | SDL_COPY_MODULATE_ALPHA |
slouken@6526
   883
        SDL_COPY_BLEND | SDL_COPY_ADD | SDL_COPY_MOD |
slouken@6526
   884
        SDL_COPY_COLORKEY
slouken@6526
   885
    );
slouken@6526
   886
slouken@7834
   887
    if (!(src->map->info.flags & SDL_COPY_NEAREST)) {
slouken@7834
   888
        src->map->info.flags |= SDL_COPY_NEAREST;
slouken@7834
   889
        SDL_InvalidateMap(src->map);
slouken@7834
   890
    }
ken@5296
   891
slouken@6526
   892
    if ( !(src->map->info.flags & complex_copy_flags) &&
slouken@7191
   893
         src->format->format == dst->format->format &&
slouken@6526
   894
         !SDL_ISPIXELFORMAT_INDEXED(src->format->format) ) {
slouken@9076
   895
        return SDL_SoftStretch( src, srcrect, dst, dstrect );
ken@5296
   896
    } else {
slouken@9076
   897
        return SDL_LowerBlit( src, srcrect, dst, dstrect );
ken@5296
   898
    }
ken@5296
   899
}
ken@5296
   900
ken@5296
   901
/*
slouken@0
   902
 * Lock a surface to directly access the pixels
slouken@0
   903
 */
slouken@1895
   904
int
slouken@1895
   905
SDL_LockSurface(SDL_Surface * surface)
slouken@0
   906
{
slouken@1895
   907
    if (!surface->locked) {
slouken@1895
   908
        /* Perform the lock */
slouken@1895
   909
        if (surface->flags & SDL_RLEACCEL) {
slouken@1895
   910
            SDL_UnRLESurface(surface, 1);
slouken@1895
   911
            surface->flags |= SDL_RLEACCEL;     /* save accel'd state */
slouken@1895
   912
        }
slouken@1895
   913
    }
slouken@0
   914
slouken@1895
   915
    /* Increment the surface lock count, for recursive locks */
slouken@1895
   916
    ++surface->locked;
slouken@0
   917
slouken@1895
   918
    /* Ready to go.. */
slouken@1895
   919
    return (0);
slouken@0
   920
}
slouken@1895
   921
slouken@0
   922
/*
slouken@0
   923
 * Unlock a previously locked surface
slouken@0
   924
 */
slouken@1895
   925
void
slouken@1895
   926
SDL_UnlockSurface(SDL_Surface * surface)
slouken@0
   927
{
slouken@1895
   928
    /* Only perform an unlock if we are locked */
slouken@1895
   929
    if (!surface->locked || (--surface->locked > 0)) {
slouken@1895
   930
        return;
slouken@1895
   931
    }
slouken@0
   932
slouken@1895
   933
    /* Update RLE encoded surface with new data */
slouken@1895
   934
    if ((surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL) {
slouken@1895
   935
        surface->flags &= ~SDL_RLEACCEL;        /* stop lying */
slouken@1895
   936
        SDL_RLESurface(surface);
slouken@1895
   937
    }
slouken@0
   938
}
slouken@0
   939
slouken@7191
   940
/*
slouken@11289
   941
 * Creates a new surface identical to the existing surface
slouken@11289
   942
 */
slouken@11289
   943
SDL_Surface *
slouken@11289
   944
SDL_DuplicateSurface(SDL_Surface * surface)
slouken@11289
   945
{
slouken@11289
   946
    return SDL_ConvertSurface(surface, surface->format, surface->flags);
slouken@11289
   947
}
slouken@11289
   948
slouken@11289
   949
/*
slouken@0
   950
 * Convert a surface into the specified pixel format.
slouken@0
   951
 */
slouken@1895
   952
SDL_Surface *
icculus@7725
   953
SDL_ConvertSurface(SDL_Surface * surface, const SDL_PixelFormat * format,
slouken@2807
   954
                   Uint32 flags)
slouken@0
   955
{
slouken@1895
   956
    SDL_Surface *convert;
slouken@2266
   957
    Uint32 copy_flags;
slouken@7601
   958
    SDL_Color copy_color;
slouken@1895
   959
    SDL_Rect bounds;
sylvain@12584
   960
    int ret;
slouken@0
   961
slouken@11289
   962
    if (!surface) {
slouken@11289
   963
        SDL_InvalidParamError("surface");
slouken@11289
   964
        return NULL;
slouken@11289
   965
    }
slouken@11289
   966
    if (!format) {
slouken@11289
   967
        SDL_InvalidParamError("format");
slouken@11289
   968
        return NULL;
slouken@11289
   969
    }
slouken@11289
   970
slouken@1895
   971
    /* Check for empty destination palette! (results in empty image) */
slouken@1895
   972
    if (format->palette != NULL) {
slouken@1895
   973
        int i;
slouken@1895
   974
        for (i = 0; i < format->palette->ncolors; ++i) {
slouken@1895
   975
            if ((format->palette->colors[i].r != 0xFF) ||
slouken@1895
   976
                (format->palette->colors[i].g != 0xFF) ||
slouken@1895
   977
                (format->palette->colors[i].b != 0xFF))
slouken@1895
   978
                break;
slouken@1895
   979
        }
slouken@1895
   980
        if (i == format->palette->ncolors) {
slouken@1895
   981
            SDL_SetError("Empty destination palette");
slouken@1895
   982
            return (NULL);
slouken@1895
   983
        }
slouken@1895
   984
    }
slouken@0
   985
slouken@1895
   986
    /* Create a new surface with the desired format */
slouken@2807
   987
    convert = SDL_CreateRGBSurface(flags, surface->w, surface->h,
slouken@1895
   988
                                   format->BitsPerPixel, format->Rmask,
slouken@1895
   989
                                   format->Gmask, format->Bmask,
slouken@1895
   990
                                   format->Amask);
slouken@1895
   991
    if (convert == NULL) {
slouken@1895
   992
        return (NULL);
slouken@1895
   993
    }
slouken@264
   994
slouken@1895
   995
    /* Copy the palette if any */
slouken@1895
   996
    if (format->palette && convert->format->palette) {
slouken@1895
   997
        SDL_memcpy(convert->format->palette->colors,
slouken@1895
   998
                   format->palette->colors,
slouken@1895
   999
                   format->palette->ncolors * sizeof(SDL_Color));
slouken@1895
  1000
        convert->format->palette->ncolors = format->palette->ncolors;
slouken@1895
  1001
    }
slouken@0
  1002
slouken@2266
  1003
    /* Save the original copy flags */
slouken@2266
  1004
    copy_flags = surface->map->info.flags;
slouken@7601
  1005
    copy_color.r = surface->map->info.r;
slouken@7601
  1006
    copy_color.g = surface->map->info.g;
slouken@7601
  1007
    copy_color.b = surface->map->info.b;
slouken@7601
  1008
    copy_color.a = surface->map->info.a;
slouken@7601
  1009
    surface->map->info.r = 0xFF;
slouken@7601
  1010
    surface->map->info.g = 0xFF;
slouken@7601
  1011
    surface->map->info.b = 0xFF;
slouken@7601
  1012
    surface->map->info.a = 0xFF;
slouken@2266
  1013
    surface->map->info.flags = 0;
slouken@7601
  1014
    SDL_InvalidateMap(surface->map);
slouken@0
  1015
slouken@1895
  1016
    /* Copy over the image data */
slouken@1895
  1017
    bounds.x = 0;
slouken@1895
  1018
    bounds.y = 0;
slouken@1895
  1019
    bounds.w = surface->w;
slouken@1895
  1020
    bounds.h = surface->h;
sylvain@12584
  1021
    ret = SDL_LowerBlit(surface, &bounds, convert, &bounds);
slouken@0
  1022
slouken@1895
  1023
    /* Clean up the original surface, and update converted surface */
slouken@7601
  1024
    convert->map->info.r = copy_color.r;
slouken@7601
  1025
    convert->map->info.g = copy_color.g;
slouken@7601
  1026
    convert->map->info.b = copy_color.b;
slouken@7601
  1027
    convert->map->info.a = copy_color.a;
slouken@2824
  1028
    convert->map->info.flags =
slouken@2824
  1029
        (copy_flags &
slouken@2824
  1030
         ~(SDL_COPY_COLORKEY | SDL_COPY_BLEND
slouken@2824
  1031
           | SDL_COPY_RLE_DESIRED | SDL_COPY_RLE_COLORKEY |
slouken@2824
  1032
           SDL_COPY_RLE_ALPHAKEY));
slouken@7601
  1033
    surface->map->info.r = copy_color.r;
slouken@7601
  1034
    surface->map->info.g = copy_color.g;
slouken@7601
  1035
    surface->map->info.b = copy_color.b;
slouken@7601
  1036
    surface->map->info.a = copy_color.a;
slouken@2824
  1037
    surface->map->info.flags = copy_flags;
slouken@7601
  1038
    SDL_InvalidateMap(surface->map);
sylvain@12584
  1039
sylvain@12584
  1040
    /* SDL_LowerBlit failed, and so the conversion */
sylvain@12584
  1041
    if (ret < 0) {
sylvain@12584
  1042
        SDL_FreeSurface(convert);
sylvain@12584
  1043
        return NULL;
sylvain@12584
  1044
    }
sylvain@12584
  1045
slouken@2266
  1046
    if (copy_flags & SDL_COPY_COLORKEY) {
slouken@7023
  1047
        SDL_bool set_colorkey_by_color = SDL_FALSE;
sylvain@12566
  1048
        SDL_bool ignore_alpha          = SDL_TRUE;  /* Ignore, or not, alpha in colorkey comparison */
slouken@2266
  1049
slouken@7023
  1050
        if (surface->format->palette) {
slouken@7191
  1051
            if (format->palette &&
slouken@7023
  1052
                surface->format->palette->ncolors <= format->palette->ncolors &&
slouken@7023
  1053
                (SDL_memcmp(surface->format->palette->colors, format->palette->colors,
slouken@7023
  1054
                  surface->format->palette->ncolors * sizeof(SDL_Color)) == 0)) {
slouken@7023
  1055
                /* The palette is identical, just set the same colorkey */
slouken@7023
  1056
                SDL_SetColorKey(convert, 1, surface->map->info.colorkey);
slouken@7023
  1057
            } else if (format->Amask) {
sylvain@12566
  1058
                set_colorkey_by_color = SDL_TRUE;
sylvain@12566
  1059
                ignore_alpha = SDL_FALSE;
slouken@7023
  1060
            } else {
slouken@7023
  1061
                set_colorkey_by_color = SDL_TRUE;
slouken@7023
  1062
            }
slouken@7023
  1063
        } else {
slouken@7023
  1064
            set_colorkey_by_color = SDL_TRUE;
slouken@7023
  1065
        }
slouken@7023
  1066
slouken@7023
  1067
        if (set_colorkey_by_color) {
slouken@11253
  1068
            SDL_Surface *tmp;
slouken@11253
  1069
            SDL_Surface *tmp2;
slouken@11253
  1070
            int converted_colorkey = 0;
slouken@7023
  1071
slouken@11253
  1072
            /* Create a dummy surface to get the colorkey converted */
slouken@11253
  1073
            tmp = SDL_CreateRGBSurface(0, 1, 1,
slouken@11253
  1074
                                   surface->format->BitsPerPixel, surface->format->Rmask,
slouken@11253
  1075
                                   surface->format->Gmask, surface->format->Bmask,
slouken@11253
  1076
                                   surface->format->Amask);
slouken@11253
  1077
icculus@11496
  1078
            /* Share the palette, if any */
icculus@11496
  1079
            if (surface->format->palette) {
icculus@11496
  1080
                SDL_SetSurfacePalette(tmp, surface->format->palette);
icculus@11496
  1081
            }
sylvain@12566
  1082
slouken@11253
  1083
            SDL_FillRect(tmp, NULL, surface->map->info.colorkey);
slouken@11253
  1084
slouken@11253
  1085
            tmp->map->info.flags &= ~SDL_COPY_COLORKEY;
slouken@11253
  1086
slouken@11253
  1087
            /* Convertion of the colorkey */
slouken@11253
  1088
            tmp2 = SDL_ConvertSurface(tmp, format, 0);
slouken@11253
  1089
slouken@11253
  1090
            /* Get the converted colorkey */
slouken@11254
  1091
            SDL_memcpy(&converted_colorkey, tmp2->pixels, tmp2->format->BytesPerPixel);
slouken@11253
  1092
slouken@11253
  1093
            SDL_FreeSurface(tmp);
slouken@11253
  1094
            SDL_FreeSurface(tmp2);
slouken@11253
  1095
slouken@11253
  1096
            /* Set the converted colorkey on the new surface */
slouken@11253
  1097
            SDL_SetColorKey(convert, 1, converted_colorkey);
slouken@11253
  1098
slouken@7023
  1099
            /* This is needed when converting for 3D texture upload */
sylvain@12566
  1100
            SDL_ConvertColorkeyToAlpha(convert, ignore_alpha);
slouken@7023
  1101
        }
slouken@1895
  1102
    }
slouken@2824
  1103
    SDL_SetClipRect(convert, &surface->clip_rect);
slouken@0
  1104
slouken@2266
  1105
    /* Enable alpha blending by default if the new surface has an
slouken@2266
  1106
     * alpha channel or alpha modulation */
slouken@2824
  1107
    if ((surface->format->Amask && format->Amask) ||
slouken@11246
  1108
        (copy_flags & SDL_COPY_MODULATE_ALPHA)) {
slouken@2884
  1109
        SDL_SetSurfaceBlendMode(convert, SDL_BLENDMODE_BLEND);
slouken@1895
  1110
    }
slouken@2824
  1111
    if ((copy_flags & SDL_COPY_RLE_DESIRED) || (flags & SDL_RLEACCEL)) {
slouken@2824
  1112
        SDL_SetSurfaceRLE(convert, SDL_RLEACCEL);
slouken@2824
  1113
    }
slouken@0
  1114
slouken@1895
  1115
    /* We're ready to go! */
slouken@1895
  1116
    return (convert);
slouken@0
  1117
}
slouken@0
  1118
slouken@5375
  1119
SDL_Surface *
slouken@5375
  1120
SDL_ConvertSurfaceFormat(SDL_Surface * surface, Uint32 pixel_format,
slouken@5375
  1121
                         Uint32 flags)
slouken@5375
  1122
{
slouken@5375
  1123
    SDL_PixelFormat *fmt;
slouken@5515
  1124
    SDL_Surface *convert = NULL;
slouken@5375
  1125
slouken@5375
  1126
    fmt = SDL_AllocFormat(pixel_format);
slouken@5375
  1127
    if (fmt) {
slouken@5375
  1128
        convert = SDL_ConvertSurface(surface, fmt, flags);
slouken@5375
  1129
        SDL_FreeFormat(fmt);
slouken@5375
  1130
    }
slouken@5375
  1131
    return convert;
slouken@5375
  1132
}
slouken@5375
  1133
slouken@0
  1134
/*
slouken@3434
  1135
 * Create a surface on the stack for quick blit operations
slouken@3434
  1136
 */
slouken@7860
  1137
static SDL_INLINE SDL_bool
slouken@3434
  1138
SDL_CreateSurfaceOnStack(int width, int height, Uint32 pixel_format,
slouken@7191
  1139
                         void * pixels, int pitch, SDL_Surface * surface,
slouken@3434
  1140
                         SDL_PixelFormat * format, SDL_BlitMap * blitmap)
slouken@3434
  1141
{
slouken@5288
  1142
    if (SDL_ISPIXELFORMAT_INDEXED(pixel_format)) {
slouken@5288
  1143
        SDL_SetError("Indexed pixel formats not supported");
slouken@3434
  1144
        return SDL_FALSE;
slouken@3434
  1145
    }
slouken@5288
  1146
    if (SDL_InitFormat(format, pixel_format) < 0) {
slouken@3434
  1147
        return SDL_FALSE;
slouken@3434
  1148
    }
slouken@3434
  1149
slouken@3434
  1150
    SDL_zerop(surface);
slouken@3434
  1151
    surface->flags = SDL_PREALLOC;
slouken@5288
  1152
    surface->format = format;
slouken@3434
  1153
    surface->pixels = pixels;
slouken@3434
  1154
    surface->w = width;
slouken@3434
  1155
    surface->h = height;
slouken@3434
  1156
    surface->pitch = pitch;
slouken@3434
  1157
    /* We don't actually need to set up the clip rect for our purposes */
gabomdq@7678
  1158
    /* SDL_SetClipRect(surface, NULL); */
slouken@3434
  1159
slouken@3434
  1160
    /* Allocate an empty mapping */
slouken@3434
  1161
    SDL_zerop(blitmap);
slouken@3434
  1162
    blitmap->info.r = 0xFF;
slouken@3434
  1163
    blitmap->info.g = 0xFF;
slouken@3434
  1164
    blitmap->info.b = 0xFF;
slouken@3434
  1165
    blitmap->info.a = 0xFF;
slouken@3434
  1166
    surface->map = blitmap;
slouken@3434
  1167
slouken@3434
  1168
    /* The surface is ready to go */
slouken@3434
  1169
    surface->refcount = 1;
slouken@3434
  1170
    return SDL_TRUE;
slouken@3434
  1171
}
slouken@3434
  1172
slouken@3434
  1173
/*
slouken@3434
  1174
 * Copy a block of pixels of one format to another format
slouken@3434
  1175
 */
slouken@3434
  1176
int SDL_ConvertPixels(int width, int height,
slouken@3434
  1177
                      Uint32 src_format, const void * src, int src_pitch,
slouken@3434
  1178
                      Uint32 dst_format, void * dst, int dst_pitch)
slouken@3434
  1179
{
slouken@3434
  1180
    SDL_Surface src_surface, dst_surface;
slouken@3434
  1181
    SDL_PixelFormat src_fmt, dst_fmt;
slouken@3434
  1182
    SDL_BlitMap src_blitmap, dst_blitmap;
slouken@3434
  1183
    SDL_Rect rect;
icculus@6407
  1184
    void *nonconst_src = (void *) src;
slouken@3434
  1185
slouken@9046
  1186
    /* Check to make sure we are blitting somewhere, so we don't crash */
slouken@6920
  1187
    if (!dst) {
icculus@7037
  1188
        return SDL_InvalidParamError("dst");
slouken@6920
  1189
    }
slouken@6920
  1190
    if (!dst_pitch) {
icculus@7037
  1191
        return SDL_InvalidParamError("dst_pitch");
slouken@6920
  1192
    }
slouken@6920
  1193
slouken@11702
  1194
    if (SDL_ISPIXELFORMAT_FOURCC(src_format) && SDL_ISPIXELFORMAT_FOURCC(dst_format)) {
slouken@11702
  1195
        return SDL_ConvertPixels_YUV_to_YUV(width, height, src_format, src, src_pitch, dst_format, dst, dst_pitch);
slouken@11702
  1196
    } else if (SDL_ISPIXELFORMAT_FOURCC(src_format)) {
slouken@11702
  1197
        return SDL_ConvertPixels_YUV_to_RGB(width, height, src_format, src, src_pitch, dst_format, dst, dst_pitch);
slouken@11702
  1198
    } else if (SDL_ISPIXELFORMAT_FOURCC(dst_format)) {
slouken@11702
  1199
        return SDL_ConvertPixels_RGB_to_YUV(width, height, src_format, src, src_pitch, dst_format, dst, dst_pitch);
slouken@11702
  1200
    }
slouken@11702
  1201
slouken@3434
  1202
    /* Fast path for same format copy */
slouken@3434
  1203
    if (src_format == dst_format) {
slouken@11574
  1204
        int i;
slouken@11702
  1205
        const int bpp = SDL_BYTESPERPIXEL(src_format);
slouken@11702
  1206
        width *= bpp;
slouken@11702
  1207
        for (i = height; i--;) {
slouken@11702
  1208
            SDL_memcpy(dst, src, width);
slouken@11702
  1209
            src = (const Uint8*)src + src_pitch;
slouken@11702
  1210
            dst = (Uint8*)dst + dst_pitch;
slouken@9046
  1211
        }
slouken@6041
  1212
        return 0;
slouken@3434
  1213
    }
slouken@3434
  1214
icculus@6407
  1215
    if (!SDL_CreateSurfaceOnStack(width, height, src_format, nonconst_src,
slouken@3434
  1216
                                  src_pitch,
slouken@3434
  1217
                                  &src_surface, &src_fmt, &src_blitmap)) {
slouken@3434
  1218
        return -1;
slouken@3434
  1219
    }
slouken@3434
  1220
    if (!SDL_CreateSurfaceOnStack(width, height, dst_format, dst, dst_pitch,
slouken@3434
  1221
                                  &dst_surface, &dst_fmt, &dst_blitmap)) {
slouken@3434
  1222
        return -1;
slouken@3434
  1223
    }
slouken@3434
  1224
slouken@3434
  1225
    /* Set up the rect and go! */
slouken@3434
  1226
    rect.x = 0;
slouken@3434
  1227
    rect.y = 0;
slouken@3434
  1228
    rect.w = width;
slouken@3436
  1229
    rect.h = height;
slouken@3434
  1230
    return SDL_LowerBlit(&src_surface, &rect, &dst_surface, &rect);
slouken@3434
  1231
}
slouken@3434
  1232
slouken@3434
  1233
/*
slouken@0
  1234
 * Free a surface created by the above function.
slouken@0
  1235
 */
slouken@1895
  1236
void
slouken@1895
  1237
SDL_FreeSurface(SDL_Surface * surface)
slouken@0
  1238
{
slouken@1895
  1239
    if (surface == NULL) {
slouken@1895
  1240
        return;
slouken@1895
  1241
    }
slouken@5288
  1242
    if (surface->flags & SDL_DONTFREE) {
slouken@5288
  1243
        return;
slouken@5288
  1244
    }
slouken@11551
  1245
    SDL_InvalidateMap(surface->map);
slouken@11551
  1246
slouken@1895
  1247
    if (--surface->refcount > 0) {
slouken@1895
  1248
        return;
slouken@1895
  1249
    }
slouken@1895
  1250
    while (surface->locked > 0) {
slouken@1895
  1251
        SDL_UnlockSurface(surface);
slouken@1895
  1252
    }
slouken@1895
  1253
    if (surface->flags & SDL_RLEACCEL) {
slouken@1895
  1254
        SDL_UnRLESurface(surface, 0);
slouken@1895
  1255
    }
slouken@1895
  1256
    if (surface->format) {
slouken@1895
  1257
        SDL_SetSurfacePalette(surface, NULL);
slouken@1895
  1258
        SDL_FreeFormat(surface->format);
slouken@1895
  1259
        surface->format = NULL;
slouken@1895
  1260
    }
slouken@7719
  1261
    if (!(surface->flags & SDL_PREALLOC)) {
slouken@1895
  1262
        SDL_free(surface->pixels);
slouken@1895
  1263
    }
brandon@11563
  1264
    if (surface->map) {
brandon@11563
  1265
        SDL_FreeBlitMap(surface->map);
brandon@11563
  1266
    }
slouken@1895
  1267
    SDL_free(surface);
slouken@0
  1268
}
slouken@1895
  1269
slouken@1895
  1270
/* vi: set ts=4 sw=4 expandtab: */