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