src/video/SDL_surface.c
author Ryan C. Gordon <icculus@icculus.org>
Tue, 23 Oct 2018 01:34:03 -0400
branchSDL-ryan-batching-renderer
changeset 12352 2b1707cc57fc
parent 11811 5d94cb6b24d3
child 12204 5486557ca8d9
permissions -rw-r--r--
render: Add floating point versions of various draw APIs.
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2018 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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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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        if (surface->format->palette) {
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            surface->format->palette->colors[surface->map->info.colorkey].a = SDL_ALPHA_TRANSPARENT;
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            ++surface->format->palette->version;
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            if (!surface->format->palette->version) {
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                surface->format->palette->version = 1;
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            }
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        }
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    } else {
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        if (surface->format->palette) {
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            surface->format->palette->colors[surface->map->info.colorkey].a = SDL_ALPHA_OPAQUE;
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            ++surface->format->palette->version;
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            if (!surface->format->palette->version) {
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                surface->format->palette->version = 1;
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            }
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        }
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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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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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   305
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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)
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   315
{
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   316
    int x, y;
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   317
slouken@2786
   318
    if (!surface) {
slouken@2786
   319
        return;
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   320
    }
slouken@2785
   321
slouken@2786
   322
    if (!(surface->map->info.flags & SDL_COPY_COLORKEY) ||
slouken@2786
   323
        !surface->format->Amask) {
slouken@2786
   324
        return;
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   325
    }
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   326
slouken@2786
   327
    SDL_LockSurface(surface);
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   328
slouken@2786
   329
    switch (surface->format->BytesPerPixel) {
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   330
    case 2:
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   331
        {
slouken@2786
   332
            Uint16 *row, *spot;
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   333
            Uint16 ckey = (Uint16) surface->map->info.colorkey;
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   334
            Uint16 mask = (Uint16) (~surface->format->Amask);
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   335
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   336
            /* Ignore alpha in colorkey comparison */
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            ckey &= mask;
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   338
            row = (Uint16 *) surface->pixels;
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   339
            for (y = surface->h; y--;) {
slouken@2786
   340
                spot = row;
slouken@2786
   341
                for (x = surface->w; x--;) {
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   342
                    if ((*spot & mask) == ckey) {
slouken@2786
   343
                        *spot &= mask;
slouken@2786
   344
                    }
slouken@2786
   345
                    ++spot;
slouken@2786
   346
                }
slouken@2786
   347
                row += surface->pitch / 2;
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   348
            }
slouken@2786
   349
        }
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   350
        break;
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   351
    case 3:
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   352
        /* FIXME */
slouken@2786
   353
        break;
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   354
    case 4:
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   355
        {
slouken@2786
   356
            Uint32 *row, *spot;
slouken@2786
   357
            Uint32 ckey = surface->map->info.colorkey;
slouken@2786
   358
            Uint32 mask = ~surface->format->Amask;
slouken@2785
   359
slouken@7601
   360
            /* Ignore alpha in colorkey comparison */
slouken@7601
   361
            ckey &= mask;
slouken@2786
   362
            row = (Uint32 *) surface->pixels;
slouken@2786
   363
            for (y = surface->h; y--;) {
slouken@2786
   364
                spot = row;
slouken@2786
   365
                for (x = surface->w; x--;) {
slouken@7601
   366
                    if ((*spot & mask) == ckey) {
slouken@2786
   367
                        *spot &= mask;
slouken@2786
   368
                    }
slouken@2786
   369
                    ++spot;
slouken@2786
   370
                }
slouken@2786
   371
                row += surface->pitch / 4;
slouken@2786
   372
            }
slouken@2786
   373
        }
slouken@2786
   374
        break;
slouken@2786
   375
    }
slouken@2785
   376
slouken@2786
   377
    SDL_UnlockSurface(surface);
slouken@2785
   378
slouken@2786
   379
    SDL_SetColorKey(surface, 0, 0);
slouken@2884
   380
    SDL_SetSurfaceBlendMode(surface, SDL_BLENDMODE_BLEND);
slouken@2785
   381
}
slouken@2785
   382
slouken@2267
   383
int
slouken@2267
   384
SDL_SetSurfaceColorMod(SDL_Surface * surface, Uint8 r, Uint8 g, Uint8 b)
slouken@2266
   385
{
slouken@2266
   386
    int flags;
slouken@2266
   387
slouken@2266
   388
    if (!surface) {
slouken@2266
   389
        return -1;
slouken@2266
   390
    }
slouken@2266
   391
slouken@2266
   392
    surface->map->info.r = r;
slouken@2266
   393
    surface->map->info.g = g;
slouken@2266
   394
    surface->map->info.b = b;
slouken@2266
   395
slouken@2266
   396
    flags = surface->map->info.flags;
slouken@2266
   397
    if (r != 0xFF || g != 0xFF || b != 0xFF) {
slouken@2266
   398
        surface->map->info.flags |= SDL_COPY_MODULATE_COLOR;
slouken@2266
   399
    } else {
slouken@2266
   400
        surface->map->info.flags &= ~SDL_COPY_MODULATE_COLOR;
slouken@2266
   401
    }
slouken@2266
   402
    if (surface->map->info.flags != flags) {
slouken@2266
   403
        SDL_InvalidateMap(surface->map);
slouken@2266
   404
    }
slouken@2266
   405
    return 0;
slouken@2266
   406
}
slouken@2266
   407
slouken@2266
   408
slouken@2267
   409
int
slouken@2267
   410
SDL_GetSurfaceColorMod(SDL_Surface * surface, Uint8 * r, Uint8 * g, Uint8 * b)
slouken@2266
   411
{
slouken@2266
   412
    if (!surface) {
slouken@2266
   413
        return -1;
slouken@2266
   414
    }
slouken@2266
   415
slouken@2266
   416
    if (r) {
slouken@2266
   417
        *r = surface->map->info.r;
slouken@2266
   418
    }
slouken@2266
   419
    if (g) {
slouken@2266
   420
        *g = surface->map->info.g;
slouken@2266
   421
    }
slouken@2266
   422
    if (b) {
slouken@2266
   423
        *b = surface->map->info.b;
slouken@2266
   424
    }
slouken@2266
   425
    return 0;
slouken@2266
   426
}
slouken@2266
   427
slouken@2267
   428
int
slouken@2267
   429
SDL_SetSurfaceAlphaMod(SDL_Surface * surface, Uint8 alpha)
slouken@2266
   430
{
slouken@2266
   431
    int flags;
slouken@2266
   432
slouken@2266
   433
    if (!surface) {
slouken@2266
   434
        return -1;
slouken@2266
   435
    }
slouken@2266
   436
slouken@2266
   437
    surface->map->info.a = alpha;
slouken@2266
   438
slouken@2266
   439
    flags = surface->map->info.flags;
slouken@2266
   440
    if (alpha != 0xFF) {
slouken@2266
   441
        surface->map->info.flags |= SDL_COPY_MODULATE_ALPHA;
slouken@2266
   442
    } else {
slouken@2266
   443
        surface->map->info.flags &= ~SDL_COPY_MODULATE_ALPHA;
slouken@2266
   444
    }
slouken@2266
   445
    if (surface->map->info.flags != flags) {
slouken@2266
   446
        SDL_InvalidateMap(surface->map);
slouken@2266
   447
    }
slouken@2266
   448
    return 0;
slouken@2266
   449
}
slouken@2266
   450
slouken@2267
   451
int
slouken@2267
   452
SDL_GetSurfaceAlphaMod(SDL_Surface * surface, Uint8 * alpha)
slouken@2266
   453
{
slouken@2266
   454
    if (!surface) {
slouken@2266
   455
        return -1;
slouken@2266
   456
    }
slouken@2266
   457
slouken@2266
   458
    if (alpha) {
slouken@2266
   459
        *alpha = surface->map->info.a;
slouken@2266
   460
    }
slouken@2266
   461
    return 0;
slouken@2266
   462
}
slouken@2266
   463
slouken@2267
   464
int
slouken@4929
   465
SDL_SetSurfaceBlendMode(SDL_Surface * surface, SDL_BlendMode blendMode)
slouken@2266
   466
{
slouken@2266
   467
    int flags, status;
slouken@2266
   468
slouken@2266
   469
    if (!surface) {
slouken@2266
   470
        return -1;
slouken@2266
   471
    }
slouken@2266
   472
slouken@2266
   473
    status = 0;
slouken@2266
   474
    flags = surface->map->info.flags;
slouken@5184
   475
    surface->map->info.flags &=
slouken@5184
   476
        ~(SDL_COPY_BLEND | SDL_COPY_ADD | SDL_COPY_MOD);
slouken@2266
   477
    switch (blendMode) {
slouken@2884
   478
    case SDL_BLENDMODE_NONE:
slouken@2266
   479
        break;
slouken@2884
   480
    case SDL_BLENDMODE_BLEND:
slouken@2266
   481
        surface->map->info.flags |= SDL_COPY_BLEND;
slouken@2266
   482
        break;
slouken@2884
   483
    case SDL_BLENDMODE_ADD:
slouken@2266
   484
        surface->map->info.flags |= SDL_COPY_ADD;
slouken@2266
   485
        break;
slouken@5184
   486
    case SDL_BLENDMODE_MOD:
slouken@5184
   487
        surface->map->info.flags |= SDL_COPY_MOD;
slouken@5184
   488
        break;
slouken@2266
   489
    default:
icculus@7037
   490
        status = SDL_Unsupported();
slouken@2266
   491
        break;
slouken@2266
   492
    }
slouken@2266
   493
slouken@2266
   494
    if (surface->map->info.flags != flags) {
slouken@2266
   495
        SDL_InvalidateMap(surface->map);
slouken@2266
   496
    }
slouken@2267
   497
slouken@2266
   498
    return status;
slouken@2266
   499
}
slouken@2266
   500
slouken@2267
   501
int
slouken@4929
   502
SDL_GetSurfaceBlendMode(SDL_Surface * surface, SDL_BlendMode *blendMode)
slouken@2266
   503
{
slouken@2266
   504
    if (!surface) {
slouken@2266
   505
        return -1;
slouken@2266
   506
    }
slouken@2266
   507
slouken@2266
   508
    if (!blendMode) {
slouken@2266
   509
        return 0;
slouken@2266
   510
    }
slouken@2266
   511
slouken@5184
   512
    switch (surface->map->
slouken@5184
   513
            info.flags & (SDL_COPY_BLEND | SDL_COPY_ADD | SDL_COPY_MOD)) {
slouken@2266
   514
    case SDL_COPY_BLEND:
slouken@2884
   515
        *blendMode = SDL_BLENDMODE_BLEND;
slouken@2266
   516
        break;
slouken@2266
   517
    case SDL_COPY_ADD:
slouken@2884
   518
        *blendMode = SDL_BLENDMODE_ADD;
slouken@2266
   519
        break;
slouken@5184
   520
    case SDL_COPY_MOD:
slouken@5184
   521
        *blendMode = SDL_BLENDMODE_MOD;
slouken@5184
   522
        break;
slouken@2266
   523
    default:
slouken@2884
   524
        *blendMode = SDL_BLENDMODE_NONE;
slouken@2266
   525
        break;
slouken@2266
   526
    }
slouken@2266
   527
    return 0;
slouken@2266
   528
}
slouken@2266
   529
slouken@1895
   530
SDL_bool
slouken@1895
   531
SDL_SetClipRect(SDL_Surface * surface, const SDL_Rect * rect)
slouken@0
   532
{
slouken@1895
   533
    SDL_Rect full_rect;
slouken@0
   534
slouken@1895
   535
    /* Don't do anything if there's no surface to act on */
slouken@1895
   536
    if (!surface) {
slouken@1895
   537
        return SDL_FALSE;
slouken@1895
   538
    }
slouken@0
   539
slouken@1895
   540
    /* Set up the full surface rectangle */
slouken@1895
   541
    full_rect.x = 0;
slouken@1895
   542
    full_rect.y = 0;
slouken@1895
   543
    full_rect.w = surface->w;
slouken@1895
   544
    full_rect.h = surface->h;
slouken@0
   545
slouken@1895
   546
    /* Set the clipping rectangle */
slouken@1895
   547
    if (!rect) {
slouken@1895
   548
        surface->clip_rect = full_rect;
slouken@4966
   549
        return SDL_TRUE;
slouken@1895
   550
    }
slouken@1895
   551
    return SDL_IntersectRect(rect, &full_rect, &surface->clip_rect);
slouken@0
   552
}
slouken@1895
   553
slouken@1895
   554
void
slouken@1895
   555
SDL_GetClipRect(SDL_Surface * surface, SDL_Rect * rect)
slouken@0
   556
{
slouken@1895
   557
    if (surface && rect) {
slouken@1895
   558
        *rect = surface->clip_rect;
slouken@1895
   559
    }
slouken@0
   560
}
slouken@1895
   561
slouken@7191
   562
/*
slouken@0
   563
 * Set up a blit between two surfaces -- split into three parts:
slouken@7191
   564
 * The upper part, SDL_UpperBlit(), performs clipping and rectangle
slouken@0
   565
 * verification.  The lower part is a pointer to a low level
slouken@0
   566
 * accelerated blitting function.
slouken@0
   567
 *
slouken@7191
   568
 * These parts are separated out and each used internally by this
slouken@0
   569
 * library in the optimimum places.  They are exported so that if
slouken@0
   570
 * you know exactly what you are doing, you can optimize your code
slouken@0
   571
 * by calling the one(s) you need.
slouken@0
   572
 */
slouken@1895
   573
int
slouken@1895
   574
SDL_LowerBlit(SDL_Surface * src, SDL_Rect * srcrect,
slouken@1895
   575
              SDL_Surface * dst, SDL_Rect * dstrect)
slouken@0
   576
{
slouken@1895
   577
    /* Check to make sure the blit mapping is valid */
slouken@1895
   578
    if ((src->map->dst != dst) ||
slouken@5288
   579
        (dst->format->palette &&
slouken@6166
   580
         src->map->dst_palette_version != dst->format->palette->version) ||
slouken@6166
   581
        (src->format->palette &&
slouken@6166
   582
         src->map->src_palette_version != src->format->palette->version)) {
slouken@1895
   583
        if (SDL_MapSurface(src, dst) < 0) {
slouken@1895
   584
            return (-1);
slouken@1895
   585
        }
bob@2328
   586
        /* just here for debugging */
bob@2329
   587
/*         printf */
bob@2329
   588
/*             ("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
   589
/*              src, dst->flags, src->map->info.flags, dst, dst->flags, */
bob@2329
   590
/*              dst->map->info.flags, src->map->blit); */
slouken@1895
   591
    }
slouken@2257
   592
    return (src->map->blit(src, srcrect, dst, dstrect));
slouken@0
   593
}
slouken@0
   594
slouken@0
   595
slouken@1895
   596
int
slouken@4949
   597
SDL_UpperBlit(SDL_Surface * src, const SDL_Rect * srcrect,
slouken@1895
   598
              SDL_Surface * dst, SDL_Rect * dstrect)
slouken@0
   599
{
slouken@1895
   600
    SDL_Rect fulldst;
slouken@1895
   601
    int srcx, srcy, w, h;
slouken@0
   602
slouken@1895
   603
    /* Make sure the surfaces aren't locked */
slouken@1895
   604
    if (!src || !dst) {
icculus@7037
   605
        return SDL_SetError("SDL_UpperBlit: passed a NULL surface");
slouken@1895
   606
    }
slouken@1895
   607
    if (src->locked || dst->locked) {
icculus@7037
   608
        return SDL_SetError("Surfaces must not be locked during blit");
slouken@1895
   609
    }
slouken@0
   610
slouken@1895
   611
    /* If the destination rectangle is NULL, use the entire dest surface */
slouken@1895
   612
    if (dstrect == NULL) {
slouken@1895
   613
        fulldst.x = fulldst.y = 0;
slouken@7511
   614
        fulldst.w = dst->w;
slouken@7511
   615
        fulldst.h = dst->h;
slouken@1895
   616
        dstrect = &fulldst;
slouken@1895
   617
    }
slouken@0
   618
slouken@1895
   619
    /* clip the source rectangle to the source surface */
slouken@1895
   620
    if (srcrect) {
slouken@1895
   621
        int maxw, maxh;
slouken@0
   622
slouken@1895
   623
        srcx = srcrect->x;
slouken@1895
   624
        w = srcrect->w;
slouken@1895
   625
        if (srcx < 0) {
slouken@1895
   626
            w += srcx;
slouken@1895
   627
            dstrect->x -= srcx;
slouken@1895
   628
            srcx = 0;
slouken@1895
   629
        }
slouken@1895
   630
        maxw = src->w - srcx;
slouken@1895
   631
        if (maxw < w)
slouken@1895
   632
            w = maxw;
slouken@0
   633
slouken@1895
   634
        srcy = srcrect->y;
slouken@1895
   635
        h = srcrect->h;
slouken@1895
   636
        if (srcy < 0) {
slouken@1895
   637
            h += srcy;
slouken@1895
   638
            dstrect->y -= srcy;
slouken@1895
   639
            srcy = 0;
slouken@1895
   640
        }
slouken@1895
   641
        maxh = src->h - srcy;
slouken@1895
   642
        if (maxh < h)
slouken@1895
   643
            h = maxh;
slouken@0
   644
slouken@1895
   645
    } else {
slouken@1895
   646
        srcx = srcy = 0;
slouken@1895
   647
        w = src->w;
slouken@1895
   648
        h = src->h;
slouken@1895
   649
    }
slouken@0
   650
slouken@1895
   651
    /* clip the destination rectangle against the clip rectangle */
slouken@1895
   652
    {
slouken@1895
   653
        SDL_Rect *clip = &dst->clip_rect;
slouken@1895
   654
        int dx, dy;
slouken@0
   655
slouken@1895
   656
        dx = clip->x - dstrect->x;
slouken@1895
   657
        if (dx > 0) {
slouken@1895
   658
            w -= dx;
slouken@1895
   659
            dstrect->x += dx;
slouken@1895
   660
            srcx += dx;
slouken@1895
   661
        }
slouken@1895
   662
        dx = dstrect->x + w - clip->x - clip->w;
slouken@1895
   663
        if (dx > 0)
slouken@1895
   664
            w -= dx;
slouken@1895
   665
slouken@1895
   666
        dy = clip->y - dstrect->y;
slouken@1895
   667
        if (dy > 0) {
slouken@1895
   668
            h -= dy;
slouken@1895
   669
            dstrect->y += dy;
slouken@1895
   670
            srcy += dy;
slouken@1895
   671
        }
slouken@1895
   672
        dy = dstrect->y + h - clip->y - clip->h;
slouken@1895
   673
        if (dy > 0)
slouken@1895
   674
            h -= dy;
slouken@1895
   675
    }
slouken@1895
   676
slouken@7834
   677
    /* Switch back to a fast blit if we were previously stretching */
slouken@7834
   678
    if (src->map->info.flags & SDL_COPY_NEAREST) {
slouken@7834
   679
        src->map->info.flags &= ~SDL_COPY_NEAREST;
slouken@7834
   680
        SDL_InvalidateMap(src->map);
slouken@7834
   681
    }
slouken@7834
   682
slouken@1895
   683
    if (w > 0 && h > 0) {
slouken@1895
   684
        SDL_Rect sr;
slouken@1895
   685
        sr.x = srcx;
slouken@1895
   686
        sr.y = srcy;
slouken@1895
   687
        sr.w = dstrect->w = w;
slouken@1895
   688
        sr.h = dstrect->h = h;
slouken@1895
   689
        return SDL_LowerBlit(src, &sr, dst, dstrect);
slouken@1895
   690
    }
slouken@1895
   691
    dstrect->w = dstrect->h = 0;
slouken@1895
   692
    return 0;
slouken@0
   693
}
slouken@0
   694
ken@5296
   695
int
ken@5499
   696
SDL_UpperBlitScaled(SDL_Surface * src, const SDL_Rect * srcrect,
ken@5499
   697
              SDL_Surface * dst, SDL_Rect * dstrect)
ken@5499
   698
{
slouken@9076
   699
    double src_x0, src_y0, src_x1, src_y1;
slouken@9076
   700
    double dst_x0, dst_y0, dst_x1, dst_y1;
slouken@9076
   701
    SDL_Rect final_src, final_dst;
slouken@9076
   702
    double scaling_w, scaling_h;
slouken@9076
   703
    int src_w, src_h;
slouken@9076
   704
    int dst_w, dst_h;
ken@5499
   705
ken@5499
   706
    /* Make sure the surfaces aren't locked */
ken@5499
   707
    if (!src || !dst) {
icculus@7037
   708
        return SDL_SetError("SDL_UpperBlitScaled: passed a NULL surface");
ken@5499
   709
    }
ken@5499
   710
    if (src->locked || dst->locked) {
icculus@7037
   711
        return SDL_SetError("Surfaces must not be locked during blit");
ken@5499
   712
    }
ken@5499
   713
slouken@9076
   714
    if (NULL == srcrect) {
slouken@9076
   715
        src_w = src->w;
slouken@9076
   716
        src_h = src->h;
slouken@9076
   717
    } else {
slouken@9076
   718
        src_w = srcrect->w;
slouken@9076
   719
        src_h = srcrect->h;
ken@5499
   720
    }
ken@5499
   721
slouken@9076
   722
    if (NULL == dstrect) {
slouken@9076
   723
        dst_w = dst->w;
slouken@9076
   724
        dst_h = dst->h;
ken@5499
   725
    } else {
slouken@9076
   726
        dst_w = dstrect->w;
slouken@9076
   727
        dst_h = dstrect->h;
ken@5499
   728
    }
ken@5499
   729
slouken@9076
   730
    if (dst_w == src_w && dst_h == src_h) {
slouken@9076
   731
        /* No scaling, defer to regular blit */
slouken@9076
   732
        return SDL_BlitSurface(src, srcrect, dst, dstrect);
ken@5499
   733
    }
ken@5499
   734
slouken@9076
   735
    scaling_w = (double)dst_w / src_w;
slouken@9076
   736
    scaling_h = (double)dst_h / src_h;
slouken@9076
   737
slouken@9076
   738
    if (NULL == dstrect) {
slouken@9076
   739
        dst_x0 = 0;
slouken@9076
   740
        dst_y0 = 0;
slouken@9076
   741
        dst_x1 = dst_w - 1;
slouken@9076
   742
        dst_y1 = dst_h - 1;
slouken@9076
   743
    } else {
slouken@9076
   744
        dst_x0 = dstrect->x;
slouken@9076
   745
        dst_y0 = dstrect->y;
slouken@9076
   746
        dst_x1 = dst_x0 + dst_w - 1;
slouken@9076
   747
        dst_y1 = dst_y0 + dst_h - 1;
ken@5499
   748
    }
ken@5499
   749
slouken@9076
   750
    if (NULL == srcrect) {
slouken@9076
   751
        src_x0 = 0;
slouken@9076
   752
        src_y0 = 0;
slouken@9076
   753
        src_x1 = src_w - 1;
slouken@9076
   754
        src_y1 = src_h - 1;
slouken@9076
   755
    } else {
slouken@9076
   756
        src_x0 = srcrect->x;
slouken@9076
   757
        src_y0 = srcrect->y;
slouken@9076
   758
        src_x1 = src_x0 + src_w - 1;
slouken@9076
   759
        src_y1 = src_y0 + src_h - 1;
slouken@9076
   760
slouken@9076
   761
        /* Clip source rectangle to the source surface */
slouken@9076
   762
slouken@9076
   763
        if (src_x0 < 0) {
slouken@9076
   764
            dst_x0 -= src_x0 * scaling_w;
slouken@9076
   765
            src_x0 = 0;
slouken@9076
   766
        }
slouken@9076
   767
slouken@9076
   768
        if (src_x1 >= src->w) {
slouken@9076
   769
            dst_x1 -= (src_x1 - src->w + 1) * scaling_w;
slouken@9076
   770
            src_x1 = src->w - 1;
slouken@9076
   771
        }
slouken@9076
   772
slouken@9076
   773
        if (src_y0 < 0) {
slouken@9076
   774
            dst_y0 -= src_y0 * scaling_h;
slouken@9076
   775
            src_y0 = 0;
slouken@9076
   776
        }
slouken@9076
   777
slouken@9076
   778
        if (src_y1 >= src->h) {
slouken@9076
   779
            dst_y1 -= (src_y1 - src->h + 1) * scaling_h;
slouken@9076
   780
            src_y1 = src->h - 1;
slouken@9076
   781
        }
slouken@9076
   782
    }
slouken@9076
   783
slouken@9076
   784
    /* Clip destination rectangle to the clip rectangle */
slouken@9076
   785
slouken@9076
   786
    /* Translate to clip space for easier calculations */
slouken@9076
   787
    dst_x0 -= dst->clip_rect.x;
slouken@9076
   788
    dst_x1 -= dst->clip_rect.x;
slouken@9076
   789
    dst_y0 -= dst->clip_rect.y;
slouken@9076
   790
    dst_y1 -= dst->clip_rect.y;
slouken@9076
   791
slouken@9076
   792
    if (dst_x0 < 0) {
slouken@9076
   793
        src_x0 -= dst_x0 / scaling_w;
slouken@9076
   794
        dst_x0 = 0;
slouken@9076
   795
    }
slouken@9076
   796
slouken@9076
   797
    if (dst_x1 >= dst->clip_rect.w) {
slouken@9076
   798
        src_x1 -= (dst_x1 - dst->clip_rect.w + 1) / scaling_w;
slouken@9076
   799
        dst_x1 = dst->clip_rect.w - 1;
slouken@9076
   800
    }
slouken@9076
   801
slouken@9076
   802
    if (dst_y0 < 0) {
slouken@9076
   803
        src_y0 -= dst_y0 / scaling_h;
slouken@9076
   804
        dst_y0 = 0;
slouken@9076
   805
    }
slouken@9076
   806
slouken@9076
   807
    if (dst_y1 >= dst->clip_rect.h) {
slouken@9076
   808
        src_y1 -= (dst_y1 - dst->clip_rect.h + 1) / scaling_h;
slouken@9076
   809
        dst_y1 = dst->clip_rect.h - 1;
slouken@9076
   810
    }
slouken@9076
   811
slouken@9076
   812
    /* Translate back to surface coordinates */
slouken@9076
   813
    dst_x0 += dst->clip_rect.x;
slouken@9076
   814
    dst_x1 += dst->clip_rect.x;
slouken@9076
   815
    dst_y0 += dst->clip_rect.y;
slouken@9076
   816
    dst_y1 += dst->clip_rect.y;
slouken@9076
   817
philipp@9267
   818
    final_src.x = (int)SDL_floor(src_x0 + 0.5);
philipp@9267
   819
    final_src.y = (int)SDL_floor(src_y0 + 0.5);
slouken@10668
   820
    final_src.w = (int)SDL_floor(src_x1 + 1 + 0.5) - (int)SDL_floor(src_x0 + 0.5);
slouken@10668
   821
    final_src.h = (int)SDL_floor(src_y1 + 1 + 0.5) - (int)SDL_floor(src_y0 + 0.5);
slouken@9076
   822
philipp@9267
   823
    final_dst.x = (int)SDL_floor(dst_x0 + 0.5);
philipp@9267
   824
    final_dst.y = (int)SDL_floor(dst_y0 + 0.5);
philipp@9267
   825
    final_dst.w = (int)SDL_floor(dst_x1 - dst_x0 + 1.5);
philipp@9267
   826
    final_dst.h = (int)SDL_floor(dst_y1 - dst_y0 + 1.5);
slouken@9076
   827
slouken@9076
   828
    if (final_dst.w < 0)
slouken@9076
   829
        final_dst.w = 0;
slouken@9076
   830
    if (final_dst.h < 0)
slouken@9076
   831
        final_dst.h = 0;
slouken@9076
   832
slouken@9076
   833
    if (dstrect)
slouken@9076
   834
        *dstrect = final_dst;
slouken@9076
   835
slouken@9076
   836
    if (final_dst.w == 0 || final_dst.h == 0 ||
slouken@9076
   837
        final_src.w <= 0 || final_src.h <= 0) {
slouken@9076
   838
        /* No-op. */
slouken@9076
   839
        return 0;
slouken@9076
   840
    }
slouken@9076
   841
slouken@9076
   842
    return SDL_LowerBlitScaled(src, &final_src, dst, &final_dst);
ken@5499
   843
}
ken@5499
   844
ken@5499
   845
/**
ken@5499
   846
 *  This is a semi-private blit function and it performs low-level surface
ken@5499
   847
 *  scaled blitting only.
ken@5499
   848
 */
ken@5499
   849
int
ken@5499
   850
SDL_LowerBlitScaled(SDL_Surface * src, SDL_Rect * srcrect,
ken@5499
   851
                SDL_Surface * dst, SDL_Rect * dstrect)
ken@5296
   852
{
slouken@6526
   853
    static const Uint32 complex_copy_flags = (
slouken@6526
   854
        SDL_COPY_MODULATE_COLOR | SDL_COPY_MODULATE_ALPHA |
slouken@6526
   855
        SDL_COPY_BLEND | SDL_COPY_ADD | SDL_COPY_MOD |
slouken@6526
   856
        SDL_COPY_COLORKEY
slouken@6526
   857
    );
slouken@6526
   858
slouken@7834
   859
    if (!(src->map->info.flags & SDL_COPY_NEAREST)) {
slouken@7834
   860
        src->map->info.flags |= SDL_COPY_NEAREST;
slouken@7834
   861
        SDL_InvalidateMap(src->map);
slouken@7834
   862
    }
ken@5296
   863
slouken@6526
   864
    if ( !(src->map->info.flags & complex_copy_flags) &&
slouken@7191
   865
         src->format->format == dst->format->format &&
slouken@6526
   866
         !SDL_ISPIXELFORMAT_INDEXED(src->format->format) ) {
slouken@9076
   867
        return SDL_SoftStretch( src, srcrect, dst, dstrect );
ken@5296
   868
    } else {
slouken@9076
   869
        return SDL_LowerBlit( src, srcrect, dst, dstrect );
ken@5296
   870
    }
ken@5296
   871
}
ken@5296
   872
ken@5296
   873
/*
slouken@0
   874
 * Lock a surface to directly access the pixels
slouken@0
   875
 */
slouken@1895
   876
int
slouken@1895
   877
SDL_LockSurface(SDL_Surface * surface)
slouken@0
   878
{
slouken@1895
   879
    if (!surface->locked) {
slouken@1895
   880
        /* Perform the lock */
slouken@1895
   881
        if (surface->flags & SDL_RLEACCEL) {
slouken@1895
   882
            SDL_UnRLESurface(surface, 1);
slouken@1895
   883
            surface->flags |= SDL_RLEACCEL;     /* save accel'd state */
slouken@1895
   884
        }
slouken@1895
   885
    }
slouken@0
   886
slouken@1895
   887
    /* Increment the surface lock count, for recursive locks */
slouken@1895
   888
    ++surface->locked;
slouken@0
   889
slouken@1895
   890
    /* Ready to go.. */
slouken@1895
   891
    return (0);
slouken@0
   892
}
slouken@1895
   893
slouken@0
   894
/*
slouken@0
   895
 * Unlock a previously locked surface
slouken@0
   896
 */
slouken@1895
   897
void
slouken@1895
   898
SDL_UnlockSurface(SDL_Surface * surface)
slouken@0
   899
{
slouken@1895
   900
    /* Only perform an unlock if we are locked */
slouken@1895
   901
    if (!surface->locked || (--surface->locked > 0)) {
slouken@1895
   902
        return;
slouken@1895
   903
    }
slouken@0
   904
slouken@1895
   905
    /* Update RLE encoded surface with new data */
slouken@1895
   906
    if ((surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL) {
slouken@1895
   907
        surface->flags &= ~SDL_RLEACCEL;        /* stop lying */
slouken@1895
   908
        SDL_RLESurface(surface);
slouken@1895
   909
    }
slouken@0
   910
}
slouken@0
   911
slouken@7191
   912
/*
slouken@11289
   913
 * Creates a new surface identical to the existing surface
slouken@11289
   914
 */
slouken@11289
   915
SDL_Surface *
slouken@11289
   916
SDL_DuplicateSurface(SDL_Surface * surface)
slouken@11289
   917
{
slouken@11289
   918
    return SDL_ConvertSurface(surface, surface->format, surface->flags);
slouken@11289
   919
}
slouken@11289
   920
slouken@11289
   921
/*
slouken@0
   922
 * Convert a surface into the specified pixel format.
slouken@0
   923
 */
slouken@1895
   924
SDL_Surface *
icculus@7725
   925
SDL_ConvertSurface(SDL_Surface * surface, const SDL_PixelFormat * format,
slouken@2807
   926
                   Uint32 flags)
slouken@0
   927
{
slouken@1895
   928
    SDL_Surface *convert;
slouken@2266
   929
    Uint32 copy_flags;
slouken@7601
   930
    SDL_Color copy_color;
slouken@1895
   931
    SDL_Rect bounds;
slouken@0
   932
slouken@11289
   933
    if (!surface) {
slouken@11289
   934
        SDL_InvalidParamError("surface");
slouken@11289
   935
        return NULL;
slouken@11289
   936
    }
slouken@11289
   937
    if (!format) {
slouken@11289
   938
        SDL_InvalidParamError("format");
slouken@11289
   939
        return NULL;
slouken@11289
   940
    }
slouken@11289
   941
slouken@1895
   942
    /* Check for empty destination palette! (results in empty image) */
slouken@1895
   943
    if (format->palette != NULL) {
slouken@1895
   944
        int i;
slouken@1895
   945
        for (i = 0; i < format->palette->ncolors; ++i) {
slouken@1895
   946
            if ((format->palette->colors[i].r != 0xFF) ||
slouken@1895
   947
                (format->palette->colors[i].g != 0xFF) ||
slouken@1895
   948
                (format->palette->colors[i].b != 0xFF))
slouken@1895
   949
                break;
slouken@1895
   950
        }
slouken@1895
   951
        if (i == format->palette->ncolors) {
slouken@1895
   952
            SDL_SetError("Empty destination palette");
slouken@1895
   953
            return (NULL);
slouken@1895
   954
        }
slouken@1895
   955
    }
slouken@0
   956
slouken@1895
   957
    /* Create a new surface with the desired format */
slouken@2807
   958
    convert = SDL_CreateRGBSurface(flags, surface->w, surface->h,
slouken@1895
   959
                                   format->BitsPerPixel, format->Rmask,
slouken@1895
   960
                                   format->Gmask, format->Bmask,
slouken@1895
   961
                                   format->Amask);
slouken@1895
   962
    if (convert == NULL) {
slouken@1895
   963
        return (NULL);
slouken@1895
   964
    }
slouken@264
   965
slouken@1895
   966
    /* Copy the palette if any */
slouken@1895
   967
    if (format->palette && convert->format->palette) {
slouken@1895
   968
        SDL_memcpy(convert->format->palette->colors,
slouken@1895
   969
                   format->palette->colors,
slouken@1895
   970
                   format->palette->ncolors * sizeof(SDL_Color));
slouken@1895
   971
        convert->format->palette->ncolors = format->palette->ncolors;
slouken@1895
   972
    }
slouken@0
   973
slouken@2266
   974
    /* Save the original copy flags */
slouken@2266
   975
    copy_flags = surface->map->info.flags;
slouken@7601
   976
    copy_color.r = surface->map->info.r;
slouken@7601
   977
    copy_color.g = surface->map->info.g;
slouken@7601
   978
    copy_color.b = surface->map->info.b;
slouken@7601
   979
    copy_color.a = surface->map->info.a;
slouken@7601
   980
    surface->map->info.r = 0xFF;
slouken@7601
   981
    surface->map->info.g = 0xFF;
slouken@7601
   982
    surface->map->info.b = 0xFF;
slouken@7601
   983
    surface->map->info.a = 0xFF;
slouken@2266
   984
    surface->map->info.flags = 0;
slouken@7601
   985
    SDL_InvalidateMap(surface->map);
slouken@0
   986
slouken@1895
   987
    /* Copy over the image data */
slouken@1895
   988
    bounds.x = 0;
slouken@1895
   989
    bounds.y = 0;
slouken@1895
   990
    bounds.w = surface->w;
slouken@1895
   991
    bounds.h = surface->h;
slouken@1895
   992
    SDL_LowerBlit(surface, &bounds, convert, &bounds);
slouken@0
   993
slouken@1895
   994
    /* Clean up the original surface, and update converted surface */
slouken@7601
   995
    convert->map->info.r = copy_color.r;
slouken@7601
   996
    convert->map->info.g = copy_color.g;
slouken@7601
   997
    convert->map->info.b = copy_color.b;
slouken@7601
   998
    convert->map->info.a = copy_color.a;
slouken@2824
   999
    convert->map->info.flags =
slouken@2824
  1000
        (copy_flags &
slouken@2824
  1001
         ~(SDL_COPY_COLORKEY | SDL_COPY_BLEND
slouken@2824
  1002
           | SDL_COPY_RLE_DESIRED | SDL_COPY_RLE_COLORKEY |
slouken@2824
  1003
           SDL_COPY_RLE_ALPHAKEY));
slouken@7601
  1004
    surface->map->info.r = copy_color.r;
slouken@7601
  1005
    surface->map->info.g = copy_color.g;
slouken@7601
  1006
    surface->map->info.b = copy_color.b;
slouken@7601
  1007
    surface->map->info.a = copy_color.a;
slouken@2824
  1008
    surface->map->info.flags = copy_flags;
slouken@7601
  1009
    SDL_InvalidateMap(surface->map);
slouken@2266
  1010
    if (copy_flags & SDL_COPY_COLORKEY) {
slouken@7023
  1011
        SDL_bool set_colorkey_by_color = SDL_FALSE;
slouken@2266
  1012
slouken@7023
  1013
        if (surface->format->palette) {
slouken@7191
  1014
            if (format->palette &&
slouken@7023
  1015
                surface->format->palette->ncolors <= format->palette->ncolors &&
slouken@7023
  1016
                (SDL_memcmp(surface->format->palette->colors, format->palette->colors,
slouken@7023
  1017
                  surface->format->palette->ncolors * sizeof(SDL_Color)) == 0)) {
slouken@7023
  1018
                /* The palette is identical, just set the same colorkey */
slouken@7023
  1019
                SDL_SetColorKey(convert, 1, surface->map->info.colorkey);
slouken@7023
  1020
            } else if (format->Amask) {
slouken@7023
  1021
                /* The alpha was set in the destination from the palette */
slouken@7023
  1022
            } else {
slouken@7023
  1023
                set_colorkey_by_color = SDL_TRUE;
slouken@7023
  1024
            }
slouken@7023
  1025
        } else {
slouken@7023
  1026
            set_colorkey_by_color = SDL_TRUE;
slouken@7023
  1027
        }
slouken@7023
  1028
slouken@7023
  1029
        if (set_colorkey_by_color) {
slouken@11253
  1030
            SDL_Surface *tmp;
slouken@11253
  1031
            SDL_Surface *tmp2;
slouken@11253
  1032
            int converted_colorkey = 0;
slouken@7023
  1033
slouken@11253
  1034
            /* Create a dummy surface to get the colorkey converted */
slouken@11253
  1035
            tmp = SDL_CreateRGBSurface(0, 1, 1,
slouken@11253
  1036
                                   surface->format->BitsPerPixel, surface->format->Rmask,
slouken@11253
  1037
                                   surface->format->Gmask, surface->format->Bmask,
slouken@11253
  1038
                                   surface->format->Amask);
slouken@11253
  1039
icculus@11496
  1040
            /* Share the palette, if any */
icculus@11496
  1041
            if (surface->format->palette) {
icculus@11496
  1042
                SDL_SetSurfacePalette(tmp, surface->format->palette);
icculus@11496
  1043
            }
icculus@11496
  1044
            
slouken@11253
  1045
            SDL_FillRect(tmp, NULL, surface->map->info.colorkey);
slouken@11253
  1046
slouken@11253
  1047
            tmp->map->info.flags &= ~SDL_COPY_COLORKEY;
slouken@11253
  1048
slouken@11253
  1049
            /* Convertion of the colorkey */
slouken@11253
  1050
            tmp2 = SDL_ConvertSurface(tmp, format, 0);
slouken@11253
  1051
slouken@11253
  1052
            /* Get the converted colorkey */
slouken@11254
  1053
            SDL_memcpy(&converted_colorkey, tmp2->pixels, tmp2->format->BytesPerPixel);
slouken@11253
  1054
slouken@11253
  1055
            SDL_FreeSurface(tmp);
slouken@11253
  1056
            SDL_FreeSurface(tmp2);
slouken@11253
  1057
slouken@11253
  1058
            /* Set the converted colorkey on the new surface */
slouken@11253
  1059
            SDL_SetColorKey(convert, 1, converted_colorkey);
slouken@11253
  1060
slouken@7023
  1061
            /* This is needed when converting for 3D texture upload */
slouken@7023
  1062
            SDL_ConvertColorkeyToAlpha(convert);
slouken@7023
  1063
        }
slouken@1895
  1064
    }
slouken@2824
  1065
    SDL_SetClipRect(convert, &surface->clip_rect);
slouken@0
  1066
slouken@2266
  1067
    /* Enable alpha blending by default if the new surface has an
slouken@2266
  1068
     * alpha channel or alpha modulation */
slouken@2824
  1069
    if ((surface->format->Amask && format->Amask) ||
slouken@11246
  1070
        (copy_flags & SDL_COPY_MODULATE_ALPHA)) {
slouken@2884
  1071
        SDL_SetSurfaceBlendMode(convert, SDL_BLENDMODE_BLEND);
slouken@1895
  1072
    }
slouken@2824
  1073
    if ((copy_flags & SDL_COPY_RLE_DESIRED) || (flags & SDL_RLEACCEL)) {
slouken@2824
  1074
        SDL_SetSurfaceRLE(convert, SDL_RLEACCEL);
slouken@2824
  1075
    }
slouken@0
  1076
slouken@1895
  1077
    /* We're ready to go! */
slouken@1895
  1078
    return (convert);
slouken@0
  1079
}
slouken@0
  1080
slouken@5375
  1081
SDL_Surface *
slouken@5375
  1082
SDL_ConvertSurfaceFormat(SDL_Surface * surface, Uint32 pixel_format,
slouken@5375
  1083
                         Uint32 flags)
slouken@5375
  1084
{
slouken@5375
  1085
    SDL_PixelFormat *fmt;
slouken@5515
  1086
    SDL_Surface *convert = NULL;
slouken@5375
  1087
slouken@5375
  1088
    fmt = SDL_AllocFormat(pixel_format);
slouken@5375
  1089
    if (fmt) {
slouken@5375
  1090
        convert = SDL_ConvertSurface(surface, fmt, flags);
slouken@5375
  1091
        SDL_FreeFormat(fmt);
slouken@5375
  1092
    }
slouken@5375
  1093
    return convert;
slouken@5375
  1094
}
slouken@5375
  1095
slouken@0
  1096
/*
slouken@3434
  1097
 * Create a surface on the stack for quick blit operations
slouken@3434
  1098
 */
slouken@7860
  1099
static SDL_INLINE SDL_bool
slouken@3434
  1100
SDL_CreateSurfaceOnStack(int width, int height, Uint32 pixel_format,
slouken@7191
  1101
                         void * pixels, int pitch, SDL_Surface * surface,
slouken@3434
  1102
                         SDL_PixelFormat * format, SDL_BlitMap * blitmap)
slouken@3434
  1103
{
slouken@5288
  1104
    if (SDL_ISPIXELFORMAT_INDEXED(pixel_format)) {
slouken@5288
  1105
        SDL_SetError("Indexed pixel formats not supported");
slouken@3434
  1106
        return SDL_FALSE;
slouken@3434
  1107
    }
slouken@5288
  1108
    if (SDL_InitFormat(format, pixel_format) < 0) {
slouken@3434
  1109
        return SDL_FALSE;
slouken@3434
  1110
    }
slouken@3434
  1111
slouken@3434
  1112
    SDL_zerop(surface);
slouken@3434
  1113
    surface->flags = SDL_PREALLOC;
slouken@5288
  1114
    surface->format = format;
slouken@3434
  1115
    surface->pixels = pixels;
slouken@3434
  1116
    surface->w = width;
slouken@3434
  1117
    surface->h = height;
slouken@3434
  1118
    surface->pitch = pitch;
slouken@3434
  1119
    /* We don't actually need to set up the clip rect for our purposes */
gabomdq@7678
  1120
    /* SDL_SetClipRect(surface, NULL); */
slouken@3434
  1121
slouken@3434
  1122
    /* Allocate an empty mapping */
slouken@3434
  1123
    SDL_zerop(blitmap);
slouken@3434
  1124
    blitmap->info.r = 0xFF;
slouken@3434
  1125
    blitmap->info.g = 0xFF;
slouken@3434
  1126
    blitmap->info.b = 0xFF;
slouken@3434
  1127
    blitmap->info.a = 0xFF;
slouken@3434
  1128
    surface->map = blitmap;
slouken@3434
  1129
slouken@3434
  1130
    /* The surface is ready to go */
slouken@3434
  1131
    surface->refcount = 1;
slouken@3434
  1132
    return SDL_TRUE;
slouken@3434
  1133
}
slouken@3434
  1134
slouken@3434
  1135
/*
slouken@3434
  1136
 * Copy a block of pixels of one format to another format
slouken@3434
  1137
 */
slouken@3434
  1138
int SDL_ConvertPixels(int width, int height,
slouken@3434
  1139
                      Uint32 src_format, const void * src, int src_pitch,
slouken@3434
  1140
                      Uint32 dst_format, void * dst, int dst_pitch)
slouken@3434
  1141
{
slouken@3434
  1142
    SDL_Surface src_surface, dst_surface;
slouken@3434
  1143
    SDL_PixelFormat src_fmt, dst_fmt;
slouken@3434
  1144
    SDL_BlitMap src_blitmap, dst_blitmap;
slouken@3434
  1145
    SDL_Rect rect;
icculus@6407
  1146
    void *nonconst_src = (void *) src;
slouken@3434
  1147
slouken@9046
  1148
    /* Check to make sure we are blitting somewhere, so we don't crash */
slouken@6920
  1149
    if (!dst) {
icculus@7037
  1150
        return SDL_InvalidParamError("dst");
slouken@6920
  1151
    }
slouken@6920
  1152
    if (!dst_pitch) {
icculus@7037
  1153
        return SDL_InvalidParamError("dst_pitch");
slouken@6920
  1154
    }
slouken@6920
  1155
slouken@11702
  1156
    if (SDL_ISPIXELFORMAT_FOURCC(src_format) && SDL_ISPIXELFORMAT_FOURCC(dst_format)) {
slouken@11702
  1157
        return SDL_ConvertPixels_YUV_to_YUV(width, height, src_format, src, src_pitch, dst_format, dst, dst_pitch);
slouken@11702
  1158
    } else if (SDL_ISPIXELFORMAT_FOURCC(src_format)) {
slouken@11702
  1159
        return SDL_ConvertPixels_YUV_to_RGB(width, height, src_format, src, src_pitch, dst_format, dst, dst_pitch);
slouken@11702
  1160
    } else if (SDL_ISPIXELFORMAT_FOURCC(dst_format)) {
slouken@11702
  1161
        return SDL_ConvertPixels_RGB_to_YUV(width, height, src_format, src, src_pitch, dst_format, dst, dst_pitch);
slouken@11702
  1162
    }
slouken@11702
  1163
slouken@3434
  1164
    /* Fast path for same format copy */
slouken@3434
  1165
    if (src_format == dst_format) {
slouken@11574
  1166
        int i;
slouken@11702
  1167
        const int bpp = SDL_BYTESPERPIXEL(src_format);
slouken@11702
  1168
        width *= bpp;
slouken@11702
  1169
        for (i = height; i--;) {
slouken@11702
  1170
            SDL_memcpy(dst, src, width);
slouken@11702
  1171
            src = (const Uint8*)src + src_pitch;
slouken@11702
  1172
            dst = (Uint8*)dst + dst_pitch;
slouken@9046
  1173
        }
slouken@6041
  1174
        return 0;
slouken@3434
  1175
    }
slouken@3434
  1176
icculus@6407
  1177
    if (!SDL_CreateSurfaceOnStack(width, height, src_format, nonconst_src,
slouken@3434
  1178
                                  src_pitch,
slouken@3434
  1179
                                  &src_surface, &src_fmt, &src_blitmap)) {
slouken@3434
  1180
        return -1;
slouken@3434
  1181
    }
slouken@3434
  1182
    if (!SDL_CreateSurfaceOnStack(width, height, dst_format, dst, dst_pitch,
slouken@3434
  1183
                                  &dst_surface, &dst_fmt, &dst_blitmap)) {
slouken@3434
  1184
        return -1;
slouken@3434
  1185
    }
slouken@3434
  1186
slouken@3434
  1187
    /* Set up the rect and go! */
slouken@3434
  1188
    rect.x = 0;
slouken@3434
  1189
    rect.y = 0;
slouken@3434
  1190
    rect.w = width;
slouken@3436
  1191
    rect.h = height;
slouken@3434
  1192
    return SDL_LowerBlit(&src_surface, &rect, &dst_surface, &rect);
slouken@3434
  1193
}
slouken@3434
  1194
slouken@3434
  1195
/*
slouken@0
  1196
 * Free a surface created by the above function.
slouken@0
  1197
 */
slouken@1895
  1198
void
slouken@1895
  1199
SDL_FreeSurface(SDL_Surface * surface)
slouken@0
  1200
{
slouken@1895
  1201
    if (surface == NULL) {
slouken@1895
  1202
        return;
slouken@1895
  1203
    }
slouken@5288
  1204
    if (surface->flags & SDL_DONTFREE) {
slouken@5288
  1205
        return;
slouken@5288
  1206
    }
slouken@11551
  1207
    SDL_InvalidateMap(surface->map);
slouken@11551
  1208
slouken@1895
  1209
    if (--surface->refcount > 0) {
slouken@1895
  1210
        return;
slouken@1895
  1211
    }
slouken@1895
  1212
    while (surface->locked > 0) {
slouken@1895
  1213
        SDL_UnlockSurface(surface);
slouken@1895
  1214
    }
slouken@1895
  1215
    if (surface->flags & SDL_RLEACCEL) {
slouken@1895
  1216
        SDL_UnRLESurface(surface, 0);
slouken@1895
  1217
    }
slouken@1895
  1218
    if (surface->format) {
slouken@1895
  1219
        SDL_SetSurfacePalette(surface, NULL);
slouken@1895
  1220
        SDL_FreeFormat(surface->format);
slouken@1895
  1221
        surface->format = NULL;
slouken@1895
  1222
    }
slouken@7719
  1223
    if (!(surface->flags & SDL_PREALLOC)) {
slouken@1895
  1224
        SDL_free(surface->pixels);
slouken@1895
  1225
    }
brandon@11563
  1226
    if (surface->map) {
brandon@11563
  1227
        SDL_FreeBlitMap(surface->map);
brandon@11563
  1228
    }
slouken@1895
  1229
    SDL_free(surface);
slouken@0
  1230
}
slouken@1895
  1231
slouken@1895
  1232
/* vi: set ts=4 sw=4 expandtab: */