src/video/dummy/SDL_nullrender.c
author Sam Lantinga <slouken@libsdl.org>
Sun, 12 Aug 2007 00:01:41 +0000
changeset 2228 bb67fd5ccfdb
parent 2227 b252359547ed
child 2262 bee005ace1bf
permissions -rw-r--r--
Fixed compile warnings with Visual C++
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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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#include "../SDL_yuv_sw_c.h"
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#include "../SDL_renderer_sw.h"
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#include "../SDL_rendercopy.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_RenderFill(SDL_Renderer * renderer, Uint8 r, Uint8 g,
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                                Uint8 b, Uint8 a, const SDL_Rect * rect);
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static int SDL_DUMMY_RenderCopy(SDL_Renderer * renderer,
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                                SDL_Texture * texture,
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                                const SDL_Rect * srcrect,
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                                const SDL_Rect * dstrect);
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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_SINGLEBUFFER | SDL_RENDERER_PRESENTCOPY |
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      SDL_RENDERER_PRESENTFLIP2 | SDL_RENDERER_PRESENTFLIP3 |
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      SDL_RENDERER_PRESENTDISCARD),
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     }
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};
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typedef struct
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{
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    int current_screen;
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    SDL_Surface *screens[3];
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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 i, n;
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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_calloc(1, 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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    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->RenderFill = SDL_DUMMY_RenderFill;
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    renderer->RenderCopy = SDL_DUMMY_RenderCopy;
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    renderer->RenderPresent = SDL_DUMMY_RenderPresent;
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    renderer->DestroyRenderer = SDL_DUMMY_DestroyRenderer;
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    renderer->info.name = SDL_DUMMY_RenderDriver.info.name;
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    renderer->info.flags = 0;
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    renderer->window = window->id;
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    renderer->driverdata = data;
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    Setup_SoftwareRenderer(renderer);
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    if (flags & SDL_RENDERER_PRESENTFLIP2) {
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        renderer->info.flags |= SDL_RENDERER_PRESENTFLIP2;
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        n = 2;
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    } else if (flags & SDL_RENDERER_PRESENTFLIP3) {
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        renderer->info.flags |= SDL_RENDERER_PRESENTFLIP3;
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        n = 3;
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    } else {
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        renderer->info.flags |= SDL_RENDERER_PRESENTCOPY;
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        n = 1;
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    }
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    for (i = 0; i < n; ++i) {
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        data->screens[i] =
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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->screens[i]) {
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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->screens[i], display->palette);
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    }
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    data->current_screen = 0;
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    return renderer;
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}
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static int
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SDL_DUMMY_RenderFill(SDL_Renderer * renderer, Uint8 r, Uint8 g, Uint8 b,
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                     Uint8 a, const SDL_Rect * rect)
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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 *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, r, g, b, a);
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    return SDL_FillRect(target, &real_rect, color);
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}
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static int
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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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{
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    SDL_DUMMY_RenderData *data =
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        (SDL_DUMMY_RenderData *) renderer->driverdata;
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    SDL_Window *window = SDL_GetWindowFromID(renderer->window);
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    SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
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    if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
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        SDL_Surface *target = data->screens[data->current_screen];
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        void *pixels =
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            (Uint8 *) target->pixels + dstrect->y * target->pitch +
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            dstrect->x * target->format->BytesPerPixel;
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        return SDL_SW_CopyYUVToRGB((SDL_SW_YUVTexture *) texture->driverdata,
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                                   srcrect, display->current_mode.format,
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                                   dstrect->w, dstrect->h, pixels,
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                                   target->pitch);
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    } else {
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        SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
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        SDL_Surface *target = data->screens[data->current_screen];
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        SDL_RenderCopyFunc copyfunc = (SDL_RenderCopyFunc) surface->userdata;
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        if (copyfunc) {
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            SDL_RenderCopyData copydata;
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            copydata.src =
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                (Uint8 *) surface->pixels + srcrect->y * surface->pitch +
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                srcrect->x * surface->format->BytesPerPixel;
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            copydata.src_w = srcrect->w;
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            copydata.src_h = srcrect->h;
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            copydata.src_pitch = surface->pitch;
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            copydata.dst =
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                (Uint8 *) target->pixels + dstrect->y * target->pitch +
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                dstrect->x * target->format->BytesPerPixel;
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            copydata.dst_w = dstrect->w;
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            copydata.dst_h = dstrect->h;
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            copydata.dst_pitch = target->pitch;
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            copydata.flags = 0;
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            if (texture->modMode & SDL_TEXTUREMODULATE_COLOR) {
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                copydata.flags |= SDL_RENDERCOPY_MODULATE_COLOR;
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                copydata.r = texture->r;
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                copydata.g = texture->g;
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                copydata.b = texture->b;
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            }
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            if (texture->modMode & SDL_TEXTUREMODULATE_ALPHA) {
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                copydata.flags |= SDL_RENDERCOPY_MODULATE_ALPHA;
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                copydata.a = texture->a;
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            }
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            if (texture->blendMode & SDL_TEXTUREBLENDMODE_MASK) {
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                copydata.flags |= SDL_RENDERCOPY_MASK;
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            } else if (texture->blendMode & SDL_TEXTUREBLENDMODE_BLEND) {
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                copydata.flags |= SDL_RENDERCOPY_BLEND;
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            } else if (texture->blendMode & SDL_TEXTUREBLENDMODE_ADD) {
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                copydata.flags |= SDL_RENDERCOPY_ADD;
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            } else if (texture->blendMode & SDL_TEXTUREBLENDMODE_MOD) {
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                copydata.flags |= SDL_RENDERCOPY_MOD;
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            }
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            if (texture->scaleMode) {
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                copydata.flags |= SDL_RENDERCOPY_NEAREST;
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            }
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            return copyfunc(&copydata);
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        } else {
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            SDL_Rect real_srcrect = *srcrect;
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            SDL_Rect real_dstrect = *dstrect;
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            return SDL_LowerBlit(surface, &real_srcrect, target,
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                                 &real_dstrect);
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        }
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    }
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}
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static 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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    /* Send the data to the display */
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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(data->screens[data->current_screen], file);
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   227
    }
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    /* 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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   232
    } else if (renderer->info.flags & SDL_RENDERER_PRESENTFLIP3) {
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   233
        data->current_screen = (data->current_screen + 1) % 3;
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   234
    }
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   235
}
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static 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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   241
        (SDL_DUMMY_RenderData *) renderer->driverdata;
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    int i;
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    if (data) {
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   245
        for (i = 0; i < SDL_arraysize(data->screens); ++i) {
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   246
            if (data->screens[i]) {
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   247
                SDL_FreeSurface(data->screens[i]);
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   248
            }
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   249
        }
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        SDL_free(data);
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   251
    }
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    SDL_free(renderer);
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   253
}
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/* vi: set ts=4 sw=4 expandtab: */