src/video/SDL_surface.c
author Ryan C. Gordon <icculus@icculus.org>
Sun, 31 Mar 2013 12:48:50 -0400
changeset 7037 3fedf1f25b94
parent 7025 4eb8ac58642c
child 7191 75360622e65f
permissions -rw-r--r--
Make SDL_SetError and friends unconditionally return -1.

This lets us change things like this...

if (Failed) {
SDL_SetError("We failed");
return -1;
}

...into this...

if (Failed) {
return SDL_SetError("We failed");
}


Fixes Bugzilla #1778.
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2013 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_config.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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/* Public routines */
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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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    SDL_Surface *surface;
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    Uint32 format;
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    /* The flags are no longer used, make the compiler happy */
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    (void)flags;
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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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    /* 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(surface);
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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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        surface->pixels = SDL_malloc(surface->h * surface->pitch);
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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 (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 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 =
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        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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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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    return SDL_SetPixelFormatPalette(surface->format, palette);
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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 -1;
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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 -1;
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    }
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    if (!(surface->map->info.flags & SDL_COPY_COLORKEY)) {
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        return -1;
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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)
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{
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    int x, y;
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    if (!surface) {
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        return;
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    }
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    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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    SDL_LockSurface(surface);
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    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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            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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                    if (*spot == ckey) {
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                        *spot &= mask;
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                    }
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                    ++spot;
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                }
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                row += surface->pitch / 2;
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            }
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        }
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        break;
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    case 3:
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        /* FIXME */
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        break;
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    case 4:
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        {
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            Uint32 *row, *spot;
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            Uint32 ckey = surface->map->info.colorkey;
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            Uint32 mask = ~surface->format->Amask;
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            row = (Uint32 *) 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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                    if (*spot == ckey) {
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                        *spot &= mask;
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                    }
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                    ++spot;
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                }
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                row += surface->pitch / 4;
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            }
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        }
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        break;
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    }
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    SDL_UnlockSurface(surface);
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    SDL_SetColorKey(surface, 0, 0);
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    SDL_SetSurfaceBlendMode(surface, SDL_BLENDMODE_BLEND);
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}
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int
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SDL_SetSurfaceColorMod(SDL_Surface * surface, Uint8 r, Uint8 g, Uint8 b)
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{
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    int flags;
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   301
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   302
    if (!surface) {
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        return -1;
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    }
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    surface->map->info.r = r;
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    surface->map->info.g = g;
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    surface->map->info.b = b;
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   309
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    flags = surface->map->info.flags;
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    if (r != 0xFF || g != 0xFF || b != 0xFF) {
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        surface->map->info.flags |= SDL_COPY_MODULATE_COLOR;
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    } else {
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        surface->map->info.flags &= ~SDL_COPY_MODULATE_COLOR;
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    }
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   316
    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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   320
}
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   321
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   322
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   323
int
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   324
SDL_GetSurfaceColorMod(SDL_Surface * surface, Uint8 * r, Uint8 * g, Uint8 * b)
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{
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   326
    if (!surface) {
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        return -1;
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    }
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   329
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   330
    if (r) {
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        *r = surface->map->info.r;
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    }
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   333
    if (g) {
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        *g = surface->map->info.g;
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   335
    }
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   336
    if (b) {
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        *b = surface->map->info.b;
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   338
    }
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   339
    return 0;
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   340
}
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   341
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   342
int
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   343
SDL_SetSurfaceAlphaMod(SDL_Surface * surface, Uint8 alpha)
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   344
{
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   345
    int flags;
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   346
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   347
    if (!surface) {
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   348
        return -1;
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   349
    }
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   350
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   351
    surface->map->info.a = alpha;
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   352
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   353
    flags = surface->map->info.flags;
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   354
    if (alpha != 0xFF) {
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   355
        surface->map->info.flags |= SDL_COPY_MODULATE_ALPHA;
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   356
    } else {
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   357
        surface->map->info.flags &= ~SDL_COPY_MODULATE_ALPHA;
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   358
    }
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   359
    if (surface->map->info.flags != flags) {
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   360
        SDL_InvalidateMap(surface->map);
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   361
    }
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   362
    return 0;
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   363
}
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   364
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   365
int
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   366
SDL_GetSurfaceAlphaMod(SDL_Surface * surface, Uint8 * alpha)
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   367
{
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   368
    if (!surface) {
slouken@2266
   369
        return -1;
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   370
    }
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   371
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   372
    if (alpha) {
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   373
        *alpha = surface->map->info.a;
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   374
    }
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   375
    return 0;
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   376
}
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   377
slouken@2267
   378
int
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   379
SDL_SetSurfaceBlendMode(SDL_Surface * surface, SDL_BlendMode blendMode)
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   380
{
slouken@2266
   381
    int flags, status;
slouken@2266
   382
slouken@2266
   383
    if (!surface) {
slouken@2266
   384
        return -1;
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   385
    }
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   386
slouken@2266
   387
    status = 0;
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   388
    flags = surface->map->info.flags;
slouken@5184
   389
    surface->map->info.flags &=
slouken@5184
   390
        ~(SDL_COPY_BLEND | SDL_COPY_ADD | SDL_COPY_MOD);
slouken@2266
   391
    switch (blendMode) {
slouken@2884
   392
    case SDL_BLENDMODE_NONE:
slouken@2266
   393
        break;
slouken@2884
   394
    case SDL_BLENDMODE_BLEND:
slouken@2266
   395
        surface->map->info.flags |= SDL_COPY_BLEND;
slouken@2266
   396
        break;
slouken@2884
   397
    case SDL_BLENDMODE_ADD:
slouken@2266
   398
        surface->map->info.flags |= SDL_COPY_ADD;
slouken@2266
   399
        break;
slouken@5184
   400
    case SDL_BLENDMODE_MOD:
slouken@5184
   401
        surface->map->info.flags |= SDL_COPY_MOD;
slouken@5184
   402
        break;
slouken@2266
   403
    default:
icculus@7037
   404
        status = SDL_Unsupported();
slouken@2266
   405
        break;
slouken@2266
   406
    }
slouken@2266
   407
slouken@2266
   408
    if (surface->map->info.flags != flags) {
slouken@2266
   409
        SDL_InvalidateMap(surface->map);
slouken@2266
   410
    }
slouken@2267
   411
slouken@2266
   412
    return status;
slouken@2266
   413
}
slouken@2266
   414
slouken@2267
   415
int
slouken@4929
   416
SDL_GetSurfaceBlendMode(SDL_Surface * surface, SDL_BlendMode *blendMode)
slouken@2266
   417
{
slouken@2266
   418
    if (!surface) {
slouken@2266
   419
        return -1;
slouken@2266
   420
    }
slouken@2266
   421
slouken@2266
   422
    if (!blendMode) {
slouken@2266
   423
        return 0;
slouken@2266
   424
    }
slouken@2266
   425
slouken@5184
   426
    switch (surface->map->
slouken@5184
   427
            info.flags & (SDL_COPY_BLEND | SDL_COPY_ADD | SDL_COPY_MOD)) {
slouken@2266
   428
    case SDL_COPY_BLEND:
slouken@2884
   429
        *blendMode = SDL_BLENDMODE_BLEND;
slouken@2266
   430
        break;
slouken@2266
   431
    case SDL_COPY_ADD:
slouken@2884
   432
        *blendMode = SDL_BLENDMODE_ADD;
slouken@2266
   433
        break;
slouken@5184
   434
    case SDL_COPY_MOD:
slouken@5184
   435
        *blendMode = SDL_BLENDMODE_MOD;
slouken@5184
   436
        break;
slouken@2266
   437
    default:
slouken@2884
   438
        *blendMode = SDL_BLENDMODE_NONE;
slouken@2266
   439
        break;
slouken@2266
   440
    }
slouken@2266
   441
    return 0;
slouken@2266
   442
}
slouken@2266
   443
slouken@1895
   444
SDL_bool
slouken@1895
   445
SDL_SetClipRect(SDL_Surface * surface, const SDL_Rect * rect)
slouken@0
   446
{
slouken@1895
   447
    SDL_Rect full_rect;
slouken@0
   448
slouken@1895
   449
    /* Don't do anything if there's no surface to act on */
slouken@1895
   450
    if (!surface) {
slouken@1895
   451
        return SDL_FALSE;
slouken@1895
   452
    }
slouken@0
   453
slouken@1895
   454
    /* Set up the full surface rectangle */
slouken@1895
   455
    full_rect.x = 0;
slouken@1895
   456
    full_rect.y = 0;
slouken@1895
   457
    full_rect.w = surface->w;
slouken@1895
   458
    full_rect.h = surface->h;
slouken@0
   459
slouken@1895
   460
    /* Set the clipping rectangle */
slouken@1895
   461
    if (!rect) {
slouken@1895
   462
        surface->clip_rect = full_rect;
slouken@4966
   463
        return SDL_TRUE;
slouken@1895
   464
    }
slouken@1895
   465
    return SDL_IntersectRect(rect, &full_rect, &surface->clip_rect);
slouken@0
   466
}
slouken@1895
   467
slouken@1895
   468
void
slouken@1895
   469
SDL_GetClipRect(SDL_Surface * surface, SDL_Rect * rect)
slouken@0
   470
{
slouken@1895
   471
    if (surface && rect) {
slouken@1895
   472
        *rect = surface->clip_rect;
slouken@1895
   473
    }
slouken@0
   474
}
slouken@1895
   475
slouken@0
   476
/* 
slouken@0
   477
 * Set up a blit between two surfaces -- split into three parts:
slouken@0
   478
 * The upper part, SDL_UpperBlit(), performs clipping and rectangle 
slouken@0
   479
 * verification.  The lower part is a pointer to a low level
slouken@0
   480
 * accelerated blitting function.
slouken@0
   481
 *
slouken@0
   482
 * These parts are separated out and each used internally by this 
slouken@0
   483
 * library in the optimimum places.  They are exported so that if
slouken@0
   484
 * you know exactly what you are doing, you can optimize your code
slouken@0
   485
 * by calling the one(s) you need.
slouken@0
   486
 */
slouken@1895
   487
int
slouken@1895
   488
SDL_LowerBlit(SDL_Surface * src, SDL_Rect * srcrect,
slouken@1895
   489
              SDL_Surface * dst, SDL_Rect * dstrect)
slouken@0
   490
{
slouken@1895
   491
    /* Check to make sure the blit mapping is valid */
slouken@1895
   492
    if ((src->map->dst != dst) ||
slouken@5288
   493
        (dst->format->palette &&
slouken@6166
   494
         src->map->dst_palette_version != dst->format->palette->version) ||
slouken@6166
   495
        (src->format->palette &&
slouken@6166
   496
         src->map->src_palette_version != src->format->palette->version)) {
slouken@1895
   497
        if (SDL_MapSurface(src, dst) < 0) {
slouken@1895
   498
            return (-1);
slouken@1895
   499
        }
bob@2328
   500
        /* just here for debugging */
bob@2329
   501
/*         printf */
bob@2329
   502
/*             ("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
   503
/*              src, dst->flags, src->map->info.flags, dst, dst->flags, */
bob@2329
   504
/*              dst->map->info.flags, src->map->blit); */
slouken@1895
   505
    }
slouken@2257
   506
    return (src->map->blit(src, srcrect, dst, dstrect));
slouken@0
   507
}
slouken@0
   508
slouken@0
   509
slouken@1895
   510
int
slouken@4949
   511
SDL_UpperBlit(SDL_Surface * src, const SDL_Rect * srcrect,
slouken@1895
   512
              SDL_Surface * dst, SDL_Rect * dstrect)
slouken@0
   513
{
slouken@1895
   514
    SDL_Rect fulldst;
slouken@1895
   515
    int srcx, srcy, w, h;
slouken@0
   516
slouken@1895
   517
    /* Make sure the surfaces aren't locked */
slouken@1895
   518
    if (!src || !dst) {
icculus@7037
   519
        return SDL_SetError("SDL_UpperBlit: passed a NULL surface");
slouken@1895
   520
    }
slouken@1895
   521
    if (src->locked || dst->locked) {
icculus@7037
   522
        return SDL_SetError("Surfaces must not be locked during blit");
slouken@1895
   523
    }
slouken@0
   524
slouken@1895
   525
    /* If the destination rectangle is NULL, use the entire dest surface */
slouken@1895
   526
    if (dstrect == NULL) {
slouken@1895
   527
        fulldst.x = fulldst.y = 0;
slouken@1895
   528
        dstrect = &fulldst;
slouken@1895
   529
    }
slouken@0
   530
slouken@1895
   531
    /* clip the source rectangle to the source surface */
slouken@1895
   532
    if (srcrect) {
slouken@1895
   533
        int maxw, maxh;
slouken@0
   534
slouken@1895
   535
        srcx = srcrect->x;
slouken@1895
   536
        w = srcrect->w;
slouken@1895
   537
        if (srcx < 0) {
slouken@1895
   538
            w += srcx;
slouken@1895
   539
            dstrect->x -= srcx;
slouken@1895
   540
            srcx = 0;
slouken@1895
   541
        }
slouken@1895
   542
        maxw = src->w - srcx;
slouken@1895
   543
        if (maxw < w)
slouken@1895
   544
            w = maxw;
slouken@0
   545
slouken@1895
   546
        srcy = srcrect->y;
slouken@1895
   547
        h = srcrect->h;
slouken@1895
   548
        if (srcy < 0) {
slouken@1895
   549
            h += srcy;
slouken@1895
   550
            dstrect->y -= srcy;
slouken@1895
   551
            srcy = 0;
slouken@1895
   552
        }
slouken@1895
   553
        maxh = src->h - srcy;
slouken@1895
   554
        if (maxh < h)
slouken@1895
   555
            h = maxh;
slouken@0
   556
slouken@1895
   557
    } else {
slouken@1895
   558
        srcx = srcy = 0;
slouken@1895
   559
        w = src->w;
slouken@1895
   560
        h = src->h;
slouken@1895
   561
    }
slouken@0
   562
slouken@1895
   563
    /* clip the destination rectangle against the clip rectangle */
slouken@1895
   564
    {
slouken@1895
   565
        SDL_Rect *clip = &dst->clip_rect;
slouken@1895
   566
        int dx, dy;
slouken@0
   567
slouken@1895
   568
        dx = clip->x - dstrect->x;
slouken@1895
   569
        if (dx > 0) {
slouken@1895
   570
            w -= dx;
slouken@1895
   571
            dstrect->x += dx;
slouken@1895
   572
            srcx += dx;
slouken@1895
   573
        }
slouken@1895
   574
        dx = dstrect->x + w - clip->x - clip->w;
slouken@1895
   575
        if (dx > 0)
slouken@1895
   576
            w -= dx;
slouken@1895
   577
slouken@1895
   578
        dy = clip->y - dstrect->y;
slouken@1895
   579
        if (dy > 0) {
slouken@1895
   580
            h -= dy;
slouken@1895
   581
            dstrect->y += dy;
slouken@1895
   582
            srcy += dy;
slouken@1895
   583
        }
slouken@1895
   584
        dy = dstrect->y + h - clip->y - clip->h;
slouken@1895
   585
        if (dy > 0)
slouken@1895
   586
            h -= dy;
slouken@1895
   587
    }
slouken@1895
   588
slouken@1895
   589
    if (w > 0 && h > 0) {
slouken@1895
   590
        SDL_Rect sr;
slouken@1895
   591
        sr.x = srcx;
slouken@1895
   592
        sr.y = srcy;
slouken@1895
   593
        sr.w = dstrect->w = w;
slouken@1895
   594
        sr.h = dstrect->h = h;
slouken@1895
   595
        return SDL_LowerBlit(src, &sr, dst, dstrect);
slouken@1895
   596
    }
slouken@1895
   597
    dstrect->w = dstrect->h = 0;
slouken@1895
   598
    return 0;
slouken@0
   599
}
slouken@0
   600
ken@5296
   601
int
ken@5499
   602
SDL_UpperBlitScaled(SDL_Surface * src, const SDL_Rect * srcrect,
ken@5499
   603
              SDL_Surface * dst, SDL_Rect * dstrect)
ken@5499
   604
{
ken@5499
   605
    SDL_Rect final_src, final_dst, fulldst;
ken@5499
   606
ken@5499
   607
    /* Make sure the surfaces aren't locked */
ken@5499
   608
    if (!src || !dst) {
icculus@7037
   609
        return SDL_SetError("SDL_UpperBlitScaled: passed a NULL surface");
ken@5499
   610
    }
ken@5499
   611
    if (src->locked || dst->locked) {
icculus@7037
   612
        return SDL_SetError("Surfaces must not be locked during blit");
ken@5499
   613
    }
ken@5499
   614
ken@5499
   615
    /* If the destination rectangle is NULL, use the entire dest surface */
ken@5499
   616
    if (dstrect == NULL) {
ken@5499
   617
        fulldst.x = fulldst.y = 0;
ken@5499
   618
        dstrect = &fulldst;
ken@5499
   619
    }
ken@5499
   620
ken@5499
   621
    /* clip the source rectangle to the source surface */
ken@5499
   622
    if (srcrect) {
ken@5499
   623
        int maxw, maxh;
ken@5499
   624
ken@5499
   625
        final_src.x = srcrect->x;
ken@5499
   626
        final_src.w = srcrect->w;
ken@5499
   627
        if (final_src.x < 0) {
ken@5499
   628
            final_src.w += final_src.x;
ken@5499
   629
            final_src.x = 0;
ken@5499
   630
        }
ken@5499
   631
        maxw = src->w - final_src.x;
ken@5499
   632
        if (maxw < final_src.w)
ken@5499
   633
            final_src.w = maxw;
ken@5499
   634
ken@5499
   635
        final_src.y = srcrect->y;
ken@5499
   636
        final_src.h = srcrect->h;
ken@5499
   637
        if (final_src.y < 0) {
ken@5499
   638
            final_src.h += final_src.y;
ken@5499
   639
            final_src.y = 0;
ken@5499
   640
        }
ken@5499
   641
        maxh = src->h - final_src.y;
ken@5499
   642
        if (maxh < final_src.h)
ken@5499
   643
            final_src.h = maxh;
ken@5499
   644
ken@5499
   645
    } else {
ken@5499
   646
        final_src.x = final_src.y = 0;
ken@5499
   647
        final_src.w = src->w;
ken@5499
   648
        final_src.h = src->h;
ken@5499
   649
    }
ken@5499
   650
ken@5499
   651
    /* clip the destination rectangle against the clip rectangle */
ken@5499
   652
    if (dstrect) {
ken@5499
   653
        int maxw, maxh;
ken@5499
   654
ken@5499
   655
        final_dst.x = dstrect->x;
ken@5499
   656
        final_dst.w = dstrect->w;
ken@5499
   657
        if (final_dst.x < 0) {
ken@5499
   658
            final_dst.w += final_dst.x;
ken@5499
   659
            final_dst.x = 0;
ken@5499
   660
        }
ken@5499
   661
        maxw = dst->w - final_dst.x;
ken@5499
   662
        if (maxw < final_dst.w)
ken@5499
   663
            final_dst.w = maxw;
ken@5499
   664
ken@5499
   665
        final_dst.y = dstrect->y;
ken@5499
   666
        final_dst.h = dstrect->h;
ken@5499
   667
        if (final_dst.y < 0) {
ken@5499
   668
            final_dst.h += final_dst.y;
ken@5499
   669
            final_dst.y = 0;
ken@5499
   670
        }
ken@5499
   671
        maxh = dst->h - final_dst.y;
ken@5499
   672
        if (maxh < final_dst.h)
ken@5499
   673
            final_dst.h = maxh;
ken@5499
   674
    } else {
ken@5499
   675
        final_dst.x = final_dst.y = 0;
ken@5499
   676
        final_dst.w = dst->w;
ken@5499
   677
        final_dst.h = dst->h;
ken@5499
   678
    }
ken@5499
   679
ken@5499
   680
    if (final_dst.w > 0 && final_dst.h > 0) {
ken@5499
   681
        return SDL_LowerBlitScaled(src, &final_src, dst, &final_dst);
ken@5499
   682
    }
ken@5499
   683
ken@5499
   684
    return 0;
ken@5499
   685
}
ken@5499
   686
ken@5499
   687
/**
ken@5499
   688
 *  This is a semi-private blit function and it performs low-level surface
ken@5499
   689
 *  scaled blitting only.
ken@5499
   690
 */
ken@5499
   691
int
ken@5499
   692
SDL_LowerBlitScaled(SDL_Surface * src, SDL_Rect * srcrect,
ken@5499
   693
                SDL_Surface * dst, SDL_Rect * dstrect)
ken@5296
   694
{
slouken@6526
   695
    static const Uint32 complex_copy_flags = (
slouken@6526
   696
        SDL_COPY_MODULATE_COLOR | SDL_COPY_MODULATE_ALPHA |
slouken@6526
   697
        SDL_COPY_BLEND | SDL_COPY_ADD | SDL_COPY_MOD |
slouken@6526
   698
        SDL_COPY_COLORKEY
slouken@6526
   699
    );
slouken@6526
   700
ken@5296
   701
    /* Save off the original dst width, height */
ken@5296
   702
    int dstW = dstrect->w;
ken@5296
   703
    int dstH = dstrect->h;
slouken@6527
   704
    SDL_Rect full_rect;
ken@5296
   705
    SDL_Rect final_dst = *dstrect;
ken@5296
   706
    SDL_Rect final_src = *srcrect;
ken@5296
   707
ken@5296
   708
    /* Clip the dst surface to the dstrect */
slouken@6527
   709
    full_rect.x = 0;
slouken@6527
   710
    full_rect.y = 0;
slouken@6527
   711
    full_rect.w = dst->w;
slouken@6527
   712
    full_rect.h = dst->h;
slouken@6527
   713
    if (!SDL_IntersectRect(&final_dst, &full_rect, &final_dst)) {
slouken@6527
   714
        return 0;
slouken@6527
   715
    }
ken@5296
   716
ken@5296
   717
    /* Did the dst width change? */
slouken@6527
   718
    if ( dstW != final_dst.w ) {
ken@5296
   719
        /* scale the src width appropriately */
ken@5296
   720
        final_src.w = final_src.w * dst->clip_rect.w / dstW;
ken@5296
   721
    }
ken@5296
   722
ken@5296
   723
    /* Did the dst height change? */
slouken@6527
   724
    if ( dstH != final_dst.h ) {
ken@5296
   725
        /* scale the src width appropriately */
ken@5296
   726
        final_src.h = final_src.h * dst->clip_rect.h / dstH;
ken@5296
   727
    }
ken@5296
   728
ken@5296
   729
    /* Clip the src surface to the srcrect */
slouken@6527
   730
    full_rect.x = 0;
slouken@6527
   731
    full_rect.y = 0;
slouken@6527
   732
    full_rect.w = src->w;
slouken@6527
   733
    full_rect.h = src->h;
slouken@6527
   734
    if (!SDL_IntersectRect(&final_src, &full_rect, &final_src)) {
slouken@6527
   735
        return 0;
slouken@6527
   736
    }
ken@5296
   737
ken@5296
   738
    src->map->info.flags |= SDL_COPY_NEAREST;
ken@5296
   739
slouken@6526
   740
    if ( !(src->map->info.flags & complex_copy_flags) &&
slouken@6526
   741
         src->format->format == dst->format->format && 
slouken@6526
   742
         !SDL_ISPIXELFORMAT_INDEXED(src->format->format) ) {
ken@5296
   743
        return SDL_SoftStretch( src, &final_src, dst, &final_dst );
ken@5296
   744
    } else {
ken@5296
   745
        return SDL_LowerBlit( src, &final_src, dst, &final_dst );
ken@5296
   746
    }
ken@5296
   747
}
ken@5296
   748
ken@5296
   749
/*
slouken@0
   750
 * Lock a surface to directly access the pixels
slouken@0
   751
 */
slouken@1895
   752
int
slouken@1895
   753
SDL_LockSurface(SDL_Surface * surface)
slouken@0
   754
{
slouken@1895
   755
    if (!surface->locked) {
slouken@1895
   756
        /* Perform the lock */
slouken@1895
   757
        if (surface->flags & SDL_RLEACCEL) {
slouken@1895
   758
            SDL_UnRLESurface(surface, 1);
slouken@1895
   759
            surface->flags |= SDL_RLEACCEL;     /* save accel'd state */
slouken@1895
   760
        }
slouken@1895
   761
    }
slouken@0
   762
slouken@1895
   763
    /* Increment the surface lock count, for recursive locks */
slouken@1895
   764
    ++surface->locked;
slouken@0
   765
slouken@1895
   766
    /* Ready to go.. */
slouken@1895
   767
    return (0);
slouken@0
   768
}
slouken@1895
   769
slouken@0
   770
/*
slouken@0
   771
 * Unlock a previously locked surface
slouken@0
   772
 */
slouken@1895
   773
void
slouken@1895
   774
SDL_UnlockSurface(SDL_Surface * surface)
slouken@0
   775
{
slouken@1895
   776
    /* Only perform an unlock if we are locked */
slouken@1895
   777
    if (!surface->locked || (--surface->locked > 0)) {
slouken@1895
   778
        return;
slouken@1895
   779
    }
slouken@0
   780
slouken@1895
   781
    /* Update RLE encoded surface with new data */
slouken@1895
   782
    if ((surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL) {
slouken@1895
   783
        surface->flags &= ~SDL_RLEACCEL;        /* stop lying */
slouken@1895
   784
        SDL_RLESurface(surface);
slouken@1895
   785
    }
slouken@0
   786
}
slouken@0
   787
slouken@0
   788
/* 
slouken@0
   789
 * Convert a surface into the specified pixel format.
slouken@0
   790
 */
slouken@1895
   791
SDL_Surface *
slouken@2807
   792
SDL_ConvertSurface(SDL_Surface * surface, SDL_PixelFormat * format,
slouken@2807
   793
                   Uint32 flags)
slouken@0
   794
{
slouken@1895
   795
    SDL_Surface *convert;
slouken@2266
   796
    Uint32 copy_flags;
slouken@1895
   797
    SDL_Rect bounds;
slouken@0
   798
slouken@1895
   799
    /* Check for empty destination palette! (results in empty image) */
slouken@1895
   800
    if (format->palette != NULL) {
slouken@1895
   801
        int i;
slouken@1895
   802
        for (i = 0; i < format->palette->ncolors; ++i) {
slouken@1895
   803
            if ((format->palette->colors[i].r != 0xFF) ||
slouken@1895
   804
                (format->palette->colors[i].g != 0xFF) ||
slouken@1895
   805
                (format->palette->colors[i].b != 0xFF))
slouken@1895
   806
                break;
slouken@1895
   807
        }
slouken@1895
   808
        if (i == format->palette->ncolors) {
slouken@1895
   809
            SDL_SetError("Empty destination palette");
slouken@1895
   810
            return (NULL);
slouken@1895
   811
        }
slouken@1895
   812
    }
slouken@0
   813
slouken@1895
   814
    /* Create a new surface with the desired format */
slouken@2807
   815
    convert = SDL_CreateRGBSurface(flags, surface->w, surface->h,
slouken@1895
   816
                                   format->BitsPerPixel, format->Rmask,
slouken@1895
   817
                                   format->Gmask, format->Bmask,
slouken@1895
   818
                                   format->Amask);
slouken@1895
   819
    if (convert == NULL) {
slouken@1895
   820
        return (NULL);
slouken@1895
   821
    }
slouken@264
   822
slouken@1895
   823
    /* Copy the palette if any */
slouken@1895
   824
    if (format->palette && convert->format->palette) {
slouken@1895
   825
        SDL_memcpy(convert->format->palette->colors,
slouken@1895
   826
                   format->palette->colors,
slouken@1895
   827
                   format->palette->ncolors * sizeof(SDL_Color));
slouken@1895
   828
        convert->format->palette->ncolors = format->palette->ncolors;
slouken@1895
   829
    }
slouken@0
   830
slouken@2266
   831
    /* Save the original copy flags */
slouken@2266
   832
    copy_flags = surface->map->info.flags;
slouken@2266
   833
    surface->map->info.flags = 0;
slouken@0
   834
slouken@1895
   835
    /* Copy over the image data */
slouken@1895
   836
    bounds.x = 0;
slouken@1895
   837
    bounds.y = 0;
slouken@1895
   838
    bounds.w = surface->w;
slouken@1895
   839
    bounds.h = surface->h;
slouken@1895
   840
    SDL_LowerBlit(surface, &bounds, convert, &bounds);
slouken@0
   841
slouken@1895
   842
    /* Clean up the original surface, and update converted surface */
slouken@2824
   843
    convert->map->info.r = surface->map->info.r;
slouken@2824
   844
    convert->map->info.g = surface->map->info.g;
slouken@2824
   845
    convert->map->info.b = surface->map->info.b;
slouken@2824
   846
    convert->map->info.a = surface->map->info.a;
slouken@2824
   847
    convert->map->info.flags =
slouken@2824
   848
        (copy_flags &
slouken@2824
   849
         ~(SDL_COPY_COLORKEY | SDL_COPY_BLEND
slouken@2824
   850
           | SDL_COPY_RLE_DESIRED | SDL_COPY_RLE_COLORKEY |
slouken@2824
   851
           SDL_COPY_RLE_ALPHAKEY));
slouken@2824
   852
    surface->map->info.flags = copy_flags;
slouken@2266
   853
    if (copy_flags & SDL_COPY_COLORKEY) {
slouken@7023
   854
        SDL_bool set_colorkey_by_color = SDL_FALSE;
slouken@2266
   855
slouken@7023
   856
        if (surface->format->palette) {
slouken@7023
   857
            if (format->palette && 
slouken@7023
   858
                surface->format->palette->ncolors <= format->palette->ncolors &&
slouken@7023
   859
                (SDL_memcmp(surface->format->palette->colors, format->palette->colors,
slouken@7023
   860
                  surface->format->palette->ncolors * sizeof(SDL_Color)) == 0)) {
slouken@7023
   861
                /* The palette is identical, just set the same colorkey */
slouken@7023
   862
                SDL_SetColorKey(convert, 1, surface->map->info.colorkey);
slouken@7023
   863
            } else if (format->Amask) {
slouken@7023
   864
                /* The alpha was set in the destination from the palette */
slouken@7023
   865
            } else {
slouken@7023
   866
                set_colorkey_by_color = SDL_TRUE;
slouken@7023
   867
            }
slouken@7023
   868
        } else {
slouken@7023
   869
            set_colorkey_by_color = SDL_TRUE;
slouken@7023
   870
        }
slouken@7023
   871
slouken@7023
   872
        if (set_colorkey_by_color) {
slouken@7023
   873
            /* Set the colorkey by color, which needs to be unique */
slouken@7023
   874
            Uint8 keyR, keyG, keyB, keyA;
slouken@7023
   875
slouken@7023
   876
            SDL_GetRGBA(surface->map->info.colorkey, surface->format, &keyR,
slouken@7023
   877
                        &keyG, &keyB, &keyA);
slouken@7023
   878
            SDL_SetColorKey(convert, 1,
slouken@7023
   879
                            SDL_MapRGBA(convert->format, keyR, keyG, keyB, keyA));
slouken@7023
   880
            /* This is needed when converting for 3D texture upload */
slouken@7023
   881
            SDL_ConvertColorkeyToAlpha(convert);
slouken@7023
   882
        }
slouken@1895
   883
    }
slouken@2824
   884
    SDL_SetClipRect(convert, &surface->clip_rect);
slouken@0
   885
slouken@2266
   886
    /* Enable alpha blending by default if the new surface has an
slouken@2266
   887
     * alpha channel or alpha modulation */
slouken@2824
   888
    if ((surface->format->Amask && format->Amask) ||
slouken@4491
   889
        (copy_flags & (SDL_COPY_COLORKEY|SDL_COPY_MODULATE_ALPHA))) {
slouken@2884
   890
        SDL_SetSurfaceBlendMode(convert, SDL_BLENDMODE_BLEND);
slouken@1895
   891
    }
slouken@2824
   892
    if ((copy_flags & SDL_COPY_RLE_DESIRED) || (flags & SDL_RLEACCEL)) {
slouken@2824
   893
        SDL_SetSurfaceRLE(convert, SDL_RLEACCEL);
slouken@2824
   894
    }
slouken@0
   895
slouken@1895
   896
    /* We're ready to go! */
slouken@1895
   897
    return (convert);
slouken@0
   898
}
slouken@0
   899
slouken@5375
   900
SDL_Surface *
slouken@5375
   901
SDL_ConvertSurfaceFormat(SDL_Surface * surface, Uint32 pixel_format,
slouken@5375
   902
                         Uint32 flags)
slouken@5375
   903
{
slouken@5375
   904
    SDL_PixelFormat *fmt;
slouken@5515
   905
    SDL_Surface *convert = NULL;
slouken@5375
   906
slouken@5375
   907
    fmt = SDL_AllocFormat(pixel_format);
slouken@5375
   908
    if (fmt) {
slouken@5375
   909
        convert = SDL_ConvertSurface(surface, fmt, flags);
slouken@5375
   910
        SDL_FreeFormat(fmt);
slouken@5375
   911
    }
slouken@5375
   912
    return convert;
slouken@5375
   913
}
slouken@5375
   914
slouken@0
   915
/*
slouken@3434
   916
 * Create a surface on the stack for quick blit operations
slouken@3434
   917
 */
slouken@3434
   918
static __inline__ SDL_bool
slouken@3434
   919
SDL_CreateSurfaceOnStack(int width, int height, Uint32 pixel_format,
slouken@3434
   920
                         void * pixels, int pitch, SDL_Surface * surface, 
slouken@3434
   921
                         SDL_PixelFormat * format, SDL_BlitMap * blitmap)
slouken@3434
   922
{
slouken@5288
   923
    if (SDL_ISPIXELFORMAT_INDEXED(pixel_format)) {
slouken@5288
   924
        SDL_SetError("Indexed pixel formats not supported");
slouken@3434
   925
        return SDL_FALSE;
slouken@3434
   926
    }
slouken@5288
   927
    if (SDL_InitFormat(format, pixel_format) < 0) {
slouken@3434
   928
        return SDL_FALSE;
slouken@3434
   929
    }
slouken@3434
   930
slouken@3434
   931
    SDL_zerop(surface);
slouken@3434
   932
    surface->flags = SDL_PREALLOC;
slouken@5288
   933
    surface->format = format;
slouken@3434
   934
    surface->pixels = pixels;
slouken@3434
   935
    surface->w = width;
slouken@3434
   936
    surface->h = height;
slouken@3434
   937
    surface->pitch = pitch;
slouken@3434
   938
    /* We don't actually need to set up the clip rect for our purposes */
slouken@3434
   939
    /*SDL_SetClipRect(surface, NULL);*/
slouken@3434
   940
slouken@3434
   941
    /* Allocate an empty mapping */
slouken@3434
   942
    SDL_zerop(blitmap);
slouken@3434
   943
    blitmap->info.r = 0xFF;
slouken@3434
   944
    blitmap->info.g = 0xFF;
slouken@3434
   945
    blitmap->info.b = 0xFF;
slouken@3434
   946
    blitmap->info.a = 0xFF;
slouken@3434
   947
    surface->map = blitmap;
slouken@3434
   948
slouken@3434
   949
    /* The surface is ready to go */
slouken@3434
   950
    surface->refcount = 1;
slouken@3434
   951
    return SDL_TRUE;
slouken@3434
   952
}
slouken@3434
   953
slouken@3434
   954
/*
slouken@3434
   955
 * Copy a block of pixels of one format to another format
slouken@3434
   956
 */
slouken@3434
   957
int SDL_ConvertPixels(int width, int height,
slouken@3434
   958
                      Uint32 src_format, const void * src, int src_pitch,
slouken@3434
   959
                      Uint32 dst_format, void * dst, int dst_pitch)
slouken@3434
   960
{
slouken@3434
   961
    SDL_Surface src_surface, dst_surface;
slouken@3434
   962
    SDL_PixelFormat src_fmt, dst_fmt;
slouken@3434
   963
    SDL_BlitMap src_blitmap, dst_blitmap;
slouken@3434
   964
    SDL_Rect rect;
icculus@6407
   965
    void *nonconst_src = (void *) src;
slouken@3434
   966
slouken@6920
   967
    /* Check to make sure we are bliting somewhere, so we don't crash */
slouken@6920
   968
    if (!dst) {
icculus@7037
   969
        return SDL_InvalidParamError("dst");
slouken@6920
   970
    }
slouken@6920
   971
    if (!dst_pitch) {
icculus@7037
   972
        return SDL_InvalidParamError("dst_pitch");
slouken@6920
   973
    }
slouken@6920
   974
slouken@3434
   975
    /* Fast path for same format copy */
slouken@3434
   976
    if (src_format == dst_format) {
slouken@3434
   977
        int bpp;
slouken@3434
   978
slouken@3434
   979
        if (SDL_ISPIXELFORMAT_FOURCC(src_format)) {
slouken@3434
   980
            switch (src_format) {
slouken@3434
   981
            case SDL_PIXELFORMAT_YV12:
slouken@3434
   982
            case SDL_PIXELFORMAT_IYUV:
slouken@3434
   983
            case SDL_PIXELFORMAT_YUY2:
slouken@3434
   984
            case SDL_PIXELFORMAT_UYVY:
slouken@3434
   985
            case SDL_PIXELFORMAT_YVYU:
slouken@3434
   986
                bpp = 2;
slouken@6663
   987
                break;
slouken@3434
   988
            default:
icculus@7037
   989
                return SDL_SetError("Unknown FOURCC pixel format");
slouken@3434
   990
            }
slouken@3434
   991
        } else {
slouken@3434
   992
            bpp = SDL_BYTESPERPIXEL(src_format);
slouken@3434
   993
        }
slouken@3434
   994
        width *= bpp;
slouken@3434
   995
slouken@3434
   996
        while (height-- > 0) {
slouken@3434
   997
            SDL_memcpy(dst, src, width);
slouken@3434
   998
            src = (Uint8*)src + src_pitch;
slouken@3434
   999
            dst = (Uint8*)dst + dst_pitch;
slouken@3434
  1000
        }
slouken@6041
  1001
        return 0;
slouken@3434
  1002
    }
slouken@3434
  1003
icculus@6407
  1004
    if (!SDL_CreateSurfaceOnStack(width, height, src_format, nonconst_src,
slouken@3434
  1005
                                  src_pitch,
slouken@3434
  1006
                                  &src_surface, &src_fmt, &src_blitmap)) {
slouken@3434
  1007
        return -1;
slouken@3434
  1008
    }
slouken@3434
  1009
    if (!SDL_CreateSurfaceOnStack(width, height, dst_format, dst, dst_pitch,
slouken@3434
  1010
                                  &dst_surface, &dst_fmt, &dst_blitmap)) {
slouken@3434
  1011
        return -1;
slouken@3434
  1012
    }
slouken@3434
  1013
slouken@3434
  1014
    /* Set up the rect and go! */
slouken@3434
  1015
    rect.x = 0;
slouken@3434
  1016
    rect.y = 0;
slouken@3434
  1017
    rect.w = width;
slouken@3436
  1018
    rect.h = height;
slouken@3434
  1019
    return SDL_LowerBlit(&src_surface, &rect, &dst_surface, &rect);
slouken@3434
  1020
}
slouken@3434
  1021
slouken@3434
  1022
/*
slouken@0
  1023
 * Free a surface created by the above function.
slouken@0
  1024
 */
slouken@1895
  1025
void
slouken@1895
  1026
SDL_FreeSurface(SDL_Surface * surface)
slouken@0
  1027
{
slouken@1895
  1028
    if (surface == NULL) {
slouken@1895
  1029
        return;
slouken@1895
  1030
    }
slouken@5288
  1031
    if (surface->flags & SDL_DONTFREE) {
slouken@5288
  1032
        return;
slouken@5288
  1033
    }
slouken@1895
  1034
    if (--surface->refcount > 0) {
slouken@1895
  1035
        return;
slouken@1895
  1036
    }
slouken@1895
  1037
    while (surface->locked > 0) {
slouken@1895
  1038
        SDL_UnlockSurface(surface);
slouken@1895
  1039
    }
slouken@1895
  1040
    if (surface->flags & SDL_RLEACCEL) {
slouken@1895
  1041
        SDL_UnRLESurface(surface, 0);
slouken@1895
  1042
    }
slouken@1895
  1043
    if (surface->format) {
slouken@1895
  1044
        SDL_SetSurfacePalette(surface, NULL);
slouken@1895
  1045
        SDL_FreeFormat(surface->format);
slouken@1895
  1046
        surface->format = NULL;
slouken@1895
  1047
    }
slouken@1895
  1048
    if (surface->map != NULL) {
slouken@1895
  1049
        SDL_FreeBlitMap(surface->map);
slouken@1895
  1050
        surface->map = NULL;
slouken@1895
  1051
    }
slouken@1895
  1052
    if (surface->pixels && ((surface->flags & SDL_PREALLOC) != SDL_PREALLOC)) {
slouken@1895
  1053
        SDL_free(surface->pixels);
slouken@1895
  1054
    }
slouken@1895
  1055
    SDL_free(surface);
slouken@0
  1056
}
slouken@1895
  1057
slouken@1895
  1058
/* vi: set ts=4 sw=4 expandtab: */