src/video/dummy/SDL_nullrender.c
author Sam Lantinga <slouken@libsdl.org>
Fri, 14 Jul 2006 08:24:43 +0000
changeset 1906 0c49855a7a3e
parent 1895 c121d94672cb
child 1907 06c27a737b7a
permissions -rw-r--r--
Changed the name of the dummy renderer
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2006 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, write to the Free Software
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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    Sam Lantinga
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    slouken@libsdl.org
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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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/* SDL surface based renderer implementation */
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static SDL_Renderer *SDL_DUMMY_CreateRenderer(SDL_Window * window,
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                                              Uint32 flags);
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static int SDL_DUMMY_CreateTexture(SDL_Renderer * renderer,
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                                   SDL_Texture * texture);
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static int SDL_DUMMY_RenderReadPixels(SDL_Renderer * renderer,
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                                      const SDL_Rect * rect, void *pixels,
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                                      int pitch);
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static int SDL_DUMMY_RenderWritePixels(SDL_Renderer * renderer,
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                                       const SDL_Rect * rect,
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                                       const void *pixels, int pitch);
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static void SDL_DUMMY_RenderPresent(SDL_Renderer * renderer);
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static void SDL_DUMMY_DestroyRenderer(SDL_Renderer * renderer);
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SDL_RenderDriver SDL_DUMMY_RenderDriver = {
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    SDL_DUMMY_CreateRenderer,
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    {
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     "dummy",
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     (SDL_Renderer_Minimal | SDL_Renderer_PresentDiscard |
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      SDL_Renderer_PresentCopy),
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     SDL_TextureBlendMode_None,
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     SDL_TextureScaleMode_None,
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     0,
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     {0},
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     0,
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     0}
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};
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typedef struct
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{
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    SDL_Surface *surface;
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} SDL_DUMMY_RenderData;
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SDL_Renderer *
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SDL_DUMMY_CreateRenderer(SDL_Window * window, Uint32 flags)
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{
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    SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
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    SDL_DisplayMode *displayMode = &display->current_mode;
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    SDL_Renderer *renderer;
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    SDL_DUMMY_RenderData *data;
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    int bpp;
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    Uint32 Rmask, Gmask, Bmask, Amask;
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    if (!SDL_PixelFormatEnumToMasks
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        (displayMode->format, &bpp, &Rmask, &Gmask, &Bmask, &Amask)) {
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        SDL_SetError("Unknown display format");
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        return NULL;
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    }
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    renderer = (SDL_Renderer *) SDL_malloc(sizeof(*renderer));
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    if (!renderer) {
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        SDL_OutOfMemory();
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        return NULL;
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    }
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    SDL_zerop(renderer);
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    data = (SDL_DUMMY_RenderData *) SDL_malloc(sizeof(*data));
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    if (!data) {
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        SDL_DUMMY_DestroyRenderer(renderer);
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        SDL_OutOfMemory();
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        return NULL;
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    }
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    SDL_zerop(data);
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    renderer->RenderReadPixels = SDL_DUMMY_RenderReadPixels;
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    renderer->RenderWritePixels = SDL_DUMMY_RenderWritePixels;
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    renderer->RenderPresent = SDL_DUMMY_RenderPresent;
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    renderer->DestroyRenderer = SDL_DUMMY_DestroyRenderer;
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    renderer->info = SDL_DUMMY_RenderDriver.info;
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    renderer->window = window->id;
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    renderer->driverdata = data;
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    data->surface =
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        SDL_CreateRGBSurface(0, window->w, window->h, bpp, Rmask, Gmask,
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                             Bmask, Amask);
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    if (!data->surface) {
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        SDL_DUMMY_DestroyRenderer(renderer);
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        return NULL;
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    }
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    SDL_SetSurfacePalette(data->surface, display->palette);
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    return renderer;
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}
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int
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SDL_DUMMY_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
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                           void *pixels, int pitch)
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{
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    SDL_DUMMY_RenderData *data =
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        (SDL_DUMMY_RenderData *) renderer->driverdata;
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    SDL_Surface *surface = data->surface;
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    Uint8 *src, *dst;
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    int row;
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    size_t length;
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   124
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    src =
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        (Uint8 *) surface->pixels + rect->y * surface->pitch +
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        rect->x * surface->format->BytesPerPixel;
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    dst = (Uint8 *) pixels;
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    length = rect->w * surface->format->BytesPerPixel;
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    for (row = 0; row < rect->h; ++row) {
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        SDL_memcpy(dst, src, length);
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        src += surface->pitch;
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        dst += pitch;
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    }
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    return 0;
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   136
}
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   137
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int
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SDL_DUMMY_RenderWritePixels(SDL_Renderer * renderer, const SDL_Rect * rect,
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                            const void *pixels, int pitch)
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{
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    SDL_DUMMY_RenderData *data =
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        (SDL_DUMMY_RenderData *) renderer->driverdata;
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    SDL_Surface *surface = data->surface;
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    Uint8 *src, *dst;
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    int row;
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    size_t length;
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    src = (Uint8 *) pixels;
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    dst =
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        (Uint8 *) surface->pixels + rect->y * surface->pitch +
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        rect->x * surface->format->BytesPerPixel;
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    length = rect->w * surface->format->BytesPerPixel;
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    for (row = 0; row < rect->h; ++row) {
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        SDL_memcpy(dst, src, length);
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        src += pitch;
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        dst += surface->pitch;
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    }
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    return 0;
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}
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   161
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void
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SDL_DUMMY_RenderPresent(SDL_Renderer * renderer)
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{
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    static int frame_number;
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    SDL_DUMMY_RenderData *data =
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        (SDL_DUMMY_RenderData *) renderer->driverdata;
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    SDL_Surface *surface = data->surface;
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   169
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    if (SDL_getenv("SDL_VIDEO_DUMMY_SAVE_FRAMES")) {
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        char file[128];
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        SDL_snprintf(file, sizeof(file), "SDL_window%d-%8.8d.bmp",
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                     renderer->window, ++frame_number);
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        SDL_SaveBMP(surface, file);
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    }
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}
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   177
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void
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SDL_DUMMY_DestroyRenderer(SDL_Renderer * renderer)
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{
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    SDL_DUMMY_RenderData *data =
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        (SDL_DUMMY_RenderData *) renderer->driverdata;
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    if (data) {
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        if (data->surface) {
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            data->surface->format->palette = NULL;
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            SDL_FreeSurface(data->surface);
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        }
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        SDL_free(data);
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    }
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    SDL_free(renderer);
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}
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/* vi: set ts=4 sw=4 expandtab: */