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SDL_nullrender.c
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2009 Sam Lantinga
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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"
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#include "../SDL_yuv_sw_c.h"
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#include "../SDL_renderer_sw.h"
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/* SDL surface based renderer implementation */
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static SDL_Renderer *SDL_DUMMY_CreateRenderer(SDL_Window * window,
Uint32 flags);
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static int SDL_DUMMY_SetDrawColor(SDL_Renderer * renderer);
static int SDL_DUMMY_RenderFill(SDL_Renderer * renderer,
const SDL_Rect * rect);
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static int SDL_DUMMY_RenderCopy(SDL_Renderer * renderer,
SDL_Texture * texture,
const SDL_Rect * srcrect,
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const SDL_Rect * dstrect);
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static void SDL_DUMMY_RenderPresent(SDL_Renderer * renderer);
static void SDL_DUMMY_DestroyRenderer(SDL_Renderer * renderer);
SDL_RenderDriver SDL_DUMMY_RenderDriver = {
SDL_DUMMY_CreateRenderer,
{
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"dummy",
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(SDL_RENDERER_SINGLEBUFFER | SDL_RENDERER_PRESENTCOPY |
SDL_RENDERER_PRESENTFLIP2 | SDL_RENDERER_PRESENTFLIP3 |
SDL_RENDERER_PRESENTDISCARD),
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};
typedef struct
{
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int current_screen;
SDL_Surface *screens[3];
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} SDL_DUMMY_RenderData;
SDL_Renderer *
SDL_DUMMY_CreateRenderer(SDL_Window * window, Uint32 flags)
{
SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
SDL_DisplayMode *displayMode = &display->current_mode;
SDL_Renderer *renderer;
SDL_DUMMY_RenderData *data;
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int i, n;
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int bpp;
Uint32 Rmask, Gmask, Bmask, Amask;
if (!SDL_PixelFormatEnumToMasks
(displayMode->format, &bpp, &Rmask, &Gmask, &Bmask, &Amask)) {
SDL_SetError("Unknown display format");
return NULL;
}
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renderer = (SDL_Renderer *) SDL_calloc(1, sizeof(*renderer));
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if (!renderer) {
SDL_OutOfMemory();
return NULL;
}
data = (SDL_DUMMY_RenderData *) SDL_malloc(sizeof(*data));
if (!data) {
SDL_DUMMY_DestroyRenderer(renderer);
SDL_OutOfMemory();
return NULL;
}
SDL_zerop(data);
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renderer->SetDrawColor = SDL_DUMMY_SetDrawColor;
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renderer->RenderFill = SDL_DUMMY_RenderFill;
renderer->RenderCopy = SDL_DUMMY_RenderCopy;
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renderer->RenderPresent = SDL_DUMMY_RenderPresent;
renderer->DestroyRenderer = SDL_DUMMY_DestroyRenderer;
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renderer->info.name = SDL_DUMMY_RenderDriver.info.name;
renderer->info.flags = 0;
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renderer->window = window->id;
renderer->driverdata = data;
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Setup_SoftwareRenderer(renderer);
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if (flags & SDL_RENDERER_PRESENTFLIP2) {
renderer->info.flags |= SDL_RENDERER_PRESENTFLIP2;
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} else if (flags & SDL_RENDERER_PRESENTFLIP3) {
renderer->info.flags |= SDL_RENDERER_PRESENTFLIP3;
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n = 3;
} else {
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renderer->info.flags |= SDL_RENDERER_PRESENTCOPY;
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for (i = 0; i < n; ++i) {
data->screens[i] =
SDL_CreateRGBSurface(0, window->w, window->h, bpp, Rmask, Gmask,
Bmask, Amask);
if (!data->screens[i]) {
SDL_DUMMY_DestroyRenderer(renderer);
return NULL;
}
SDL_SetSurfacePalette(data->screens[i], display->palette);
}
data->current_screen = 0;
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return renderer;
}
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static int
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SDL_DUMMY_SetDrawColor(SDL_Renderer * renderer)
{
return 0;
}
static int
SDL_DUMMY_RenderFill(SDL_Renderer * renderer, const SDL_Rect * rect)
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SDL_DUMMY_RenderData *data =
(SDL_DUMMY_RenderData *) renderer->driverdata;
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SDL_Surface *target = data->screens[data->current_screen];
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Uint32 color;
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SDL_Rect real_rect = *rect;
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color = SDL_MapRGBA(target->format,
renderer->r, renderer->g, renderer->b, renderer->a);
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return SDL_FillRect(target, &real_rect, color);
}
static int
SDL_DUMMY_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
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const SDL_Rect * srcrect, const SDL_Rect * dstrect)
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SDL_DUMMY_RenderData *data =
(SDL_DUMMY_RenderData *) renderer->driverdata;
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SDL_Window *window = SDL_GetWindowFromID(renderer->window);
SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
SDL_Surface *target = data->screens[data->current_screen];
void *pixels =
(Uint8 *) target->pixels + dstrect->y * target->pitch +
dstrect->x * target->format->BytesPerPixel;
return SDL_SW_CopyYUVToRGB((SDL_SW_YUVTexture *) texture->driverdata,
srcrect, display->current_mode.format,
dstrect->w, dstrect->h, pixels,
target->pitch);
} else {
SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
SDL_Surface *target = data->screens[data->current_screen];
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SDL_Rect real_srcrect = *srcrect;
SDL_Rect real_dstrect = *dstrect;
return SDL_LowerBlit(surface, &real_srcrect, target, &real_dstrect);
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}
}
static void
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SDL_DUMMY_RenderPresent(SDL_Renderer * renderer)
{
static int frame_number;
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SDL_DUMMY_RenderData *data =
(SDL_DUMMY_RenderData *) renderer->driverdata;
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/* Send the data to the display */
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if (SDL_getenv("SDL_VIDEO_DUMMY_SAVE_FRAMES")) {
char file[128];
SDL_snprintf(file, sizeof(file), "SDL_window%d-%8.8d.bmp",
renderer->window, ++frame_number);
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SDL_SaveBMP(data->screens[data->current_screen], file);
}
/* Update the flipping chain, if any */
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if (renderer->info.flags & SDL_RENDERER_PRESENTFLIP2) {
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data->current_screen = (data->current_screen + 1) % 2;
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} else if (renderer->info.flags & SDL_RENDERER_PRESENTFLIP3) {
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data->current_screen = (data->current_screen + 1) % 3;
}
}
static void
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SDL_DUMMY_DestroyRenderer(SDL_Renderer * renderer)
{
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SDL_DUMMY_RenderData *data =
(SDL_DUMMY_RenderData *) renderer->driverdata;
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if (data) {
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for (i = 0; i < SDL_arraysize(data->screens); ++i) {
if (data->screens[i]) {
SDL_FreeSurface(data->screens[i]);
}
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}
SDL_free(data);
}
SDL_free(renderer);
}
/* vi: set ts=4 sw=4 expandtab: */