| /* |
| Simple DirectMedia Layer |
| Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org> |
| |
| This software is provided 'as-is', without any express or implied |
| warranty. In no event will the authors be held liable for any damages |
| arising from the use of this software. |
| |
| Permission is granted to anyone to use this software for any purpose, |
| including commercial applications, and to alter it and redistribute it |
| freely, subject to the following restrictions: |
| |
| 1. The origin of this software must not be misrepresented; you must not |
| claim that you wrote the original software. If you use this software |
| in a product, an acknowledgment in the product documentation would be |
| appreciated but is not required. |
| 2. Altered source versions must be plainly marked as such, and must not be |
| misrepresented as being the original software. |
| 3. This notice may not be removed or altered from any source distribution. |
| */ |
| #include "../../SDL_internal.h" |
| |
| #if !SDL_RENDER_DISABLED |
| |
| #include "../SDL_sysrender.h" |
| #include "SDL_render_sw_c.h" |
| #include "SDL_hints.h" |
| |
| #include "SDL_draw.h" |
| #include "SDL_blendfillrect.h" |
| #include "SDL_blendline.h" |
| #include "SDL_blendpoint.h" |
| #include "SDL_drawline.h" |
| #include "SDL_drawpoint.h" |
| #include "SDL_rotate.h" |
| |
| /* SDL surface based renderer implementation */ |
| |
| static SDL_Renderer *SW_CreateRenderer(SDL_Window * window, Uint32 flags); |
| static void SW_WindowEvent(SDL_Renderer * renderer, |
| const SDL_WindowEvent *event); |
| static int SW_GetOutputSize(SDL_Renderer * renderer, int *w, int *h); |
| static int SW_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture); |
| static int SW_SetTextureColorMod(SDL_Renderer * renderer, |
| SDL_Texture * texture); |
| static int SW_SetTextureAlphaMod(SDL_Renderer * renderer, |
| SDL_Texture * texture); |
| static int SW_SetTextureBlendMode(SDL_Renderer * renderer, |
| SDL_Texture * texture); |
| static int SW_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture, |
| const SDL_Rect * rect, const void *pixels, |
| int pitch); |
| static int SW_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture, |
| const SDL_Rect * rect, void **pixels, int *pitch); |
| static void SW_UnlockTexture(SDL_Renderer * renderer, SDL_Texture * texture); |
| static int SW_SetRenderTarget(SDL_Renderer * renderer, SDL_Texture * texture); |
| static int SW_UpdateViewport(SDL_Renderer * renderer); |
| static int SW_UpdateClipRect(SDL_Renderer * renderer); |
| static int SW_RenderClear(SDL_Renderer * renderer); |
| static int SW_RenderDrawPoints(SDL_Renderer * renderer, |
| const SDL_FPoint * points, int count); |
| static int SW_RenderDrawLines(SDL_Renderer * renderer, |
| const SDL_FPoint * points, int count); |
| static int SW_RenderFillRects(SDL_Renderer * renderer, |
| const SDL_FRect * rects, int count); |
| static int SW_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture, |
| const SDL_Rect * srcrect, const SDL_FRect * dstrect); |
| static int SW_RenderCopyEx(SDL_Renderer * renderer, SDL_Texture * texture, |
| const SDL_Rect * srcrect, const SDL_FRect * dstrect, |
| const double angle, const SDL_FPoint * center, const SDL_RendererFlip flip); |
| static int SW_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect, |
| Uint32 format, void * pixels, int pitch); |
| static void SW_RenderPresent(SDL_Renderer * renderer); |
| static void SW_DestroyTexture(SDL_Renderer * renderer, SDL_Texture * texture); |
| static void SW_DestroyRenderer(SDL_Renderer * renderer); |
| |
| |
| SDL_RenderDriver SW_RenderDriver = { |
| SW_CreateRenderer, |
| { |
| "software", |
| SDL_RENDERER_SOFTWARE | SDL_RENDERER_TARGETTEXTURE, |
| 8, |
| { |
| SDL_PIXELFORMAT_ARGB8888, |
| SDL_PIXELFORMAT_ABGR8888, |
| SDL_PIXELFORMAT_RGBA8888, |
| SDL_PIXELFORMAT_BGRA8888, |
| SDL_PIXELFORMAT_RGB888, |
| SDL_PIXELFORMAT_BGR888, |
| SDL_PIXELFORMAT_RGB565, |
| SDL_PIXELFORMAT_RGB555 |
| }, |
| 0, |
| 0} |
| }; |
| |
| typedef struct |
| { |
| SDL_Surface *surface; |
| SDL_Surface *window; |
| } SW_RenderData; |
| |
| |
| static SDL_Surface * |
| SW_ActivateRenderer(SDL_Renderer * renderer) |
| { |
| SW_RenderData *data = (SW_RenderData *) renderer->driverdata; |
| |
| if (!data->surface) { |
| data->surface = data->window; |
| } |
| if (!data->surface) { |
| SDL_Surface *surface = SDL_GetWindowSurface(renderer->window); |
| if (surface) { |
| data->surface = data->window = surface; |
| |
| SW_UpdateViewport(renderer); |
| SW_UpdateClipRect(renderer); |
| } |
| } |
| return data->surface; |
| } |
| |
| SDL_Renderer * |
| SW_CreateRendererForSurface(SDL_Surface * surface) |
| { |
| SDL_Renderer *renderer; |
| SW_RenderData *data; |
| |
| if (!surface) { |
| SDL_SetError("Can't create renderer for NULL surface"); |
| return NULL; |
| } |
| |
| renderer = (SDL_Renderer *) SDL_calloc(1, sizeof(*renderer)); |
| if (!renderer) { |
| SDL_OutOfMemory(); |
| return NULL; |
| } |
| |
| data = (SW_RenderData *) SDL_calloc(1, sizeof(*data)); |
| if (!data) { |
| SW_DestroyRenderer(renderer); |
| SDL_OutOfMemory(); |
| return NULL; |
| } |
| data->surface = surface; |
| data->window = surface; |
| |
| renderer->WindowEvent = SW_WindowEvent; |
| renderer->GetOutputSize = SW_GetOutputSize; |
| renderer->CreateTexture = SW_CreateTexture; |
| renderer->SetTextureColorMod = SW_SetTextureColorMod; |
| renderer->SetTextureAlphaMod = SW_SetTextureAlphaMod; |
| renderer->SetTextureBlendMode = SW_SetTextureBlendMode; |
| renderer->UpdateTexture = SW_UpdateTexture; |
| renderer->LockTexture = SW_LockTexture; |
| renderer->UnlockTexture = SW_UnlockTexture; |
| renderer->SetRenderTarget = SW_SetRenderTarget; |
| renderer->UpdateViewport = SW_UpdateViewport; |
| renderer->UpdateClipRect = SW_UpdateClipRect; |
| renderer->RenderClear = SW_RenderClear; |
| renderer->RenderDrawPoints = SW_RenderDrawPoints; |
| renderer->RenderDrawLines = SW_RenderDrawLines; |
| renderer->RenderFillRects = SW_RenderFillRects; |
| renderer->RenderCopy = SW_RenderCopy; |
| renderer->RenderCopyEx = SW_RenderCopyEx; |
| renderer->RenderReadPixels = SW_RenderReadPixels; |
| renderer->RenderPresent = SW_RenderPresent; |
| renderer->DestroyTexture = SW_DestroyTexture; |
| renderer->DestroyRenderer = SW_DestroyRenderer; |
| renderer->info = SW_RenderDriver.info; |
| renderer->driverdata = data; |
| |
| SW_ActivateRenderer(renderer); |
| |
| return renderer; |
| } |
| |
| SDL_Renderer * |
| SW_CreateRenderer(SDL_Window * window, Uint32 flags) |
| { |
| SDL_Surface *surface; |
| |
| surface = SDL_GetWindowSurface(window); |
| if (!surface) { |
| return NULL; |
| } |
| return SW_CreateRendererForSurface(surface); |
| } |
| |
| static void |
| SW_WindowEvent(SDL_Renderer * renderer, const SDL_WindowEvent *event) |
| { |
| SW_RenderData *data = (SW_RenderData *) renderer->driverdata; |
| |
| if (event->event == SDL_WINDOWEVENT_SIZE_CHANGED) { |
| data->surface = NULL; |
| data->window = NULL; |
| } |
| } |
| |
| static int |
| SW_GetOutputSize(SDL_Renderer * renderer, int *w, int *h) |
| { |
| SDL_Surface *surface = SW_ActivateRenderer(renderer); |
| |
| if (surface) { |
| if (w) { |
| *w = surface->w; |
| } |
| if (h) { |
| *h = surface->h; |
| } |
| return 0; |
| } else { |
| SDL_SetError("Software renderer doesn't have an output surface"); |
| return -1; |
| } |
| } |
| |
| static int |
| SW_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture) |
| { |
| int bpp; |
| Uint32 Rmask, Gmask, Bmask, Amask; |
| |
| if (!SDL_PixelFormatEnumToMasks |
| (texture->format, &bpp, &Rmask, &Gmask, &Bmask, &Amask)) { |
| return SDL_SetError("Unknown texture format"); |
| } |
| |
| texture->driverdata = |
| SDL_CreateRGBSurface(0, texture->w, texture->h, bpp, Rmask, Gmask, |
| Bmask, Amask); |
| SDL_SetSurfaceColorMod(texture->driverdata, texture->r, texture->g, |
| texture->b); |
| SDL_SetSurfaceAlphaMod(texture->driverdata, texture->a); |
| SDL_SetSurfaceBlendMode(texture->driverdata, texture->blendMode); |
| |
| /* Only RLE encode textures without an alpha channel since the RLE coder |
| * discards the color values of pixels with an alpha value of zero. |
| */ |
| if (texture->access == SDL_TEXTUREACCESS_STATIC && !Amask) { |
| SDL_SetSurfaceRLE(texture->driverdata, 1); |
| } |
| |
| if (!texture->driverdata) { |
| return -1; |
| } |
| return 0; |
| } |
| |
| static int |
| SW_SetTextureColorMod(SDL_Renderer * renderer, SDL_Texture * texture) |
| { |
| SDL_Surface *surface = (SDL_Surface *) texture->driverdata; |
| /* If the color mod is ever enabled (non-white), permanently disable RLE (which doesn't support |
| * color mod) to avoid potentially frequent RLE encoding/decoding. |
| */ |
| if ((texture->r & texture->g & texture->b) != 255) { |
| SDL_SetSurfaceRLE(surface, 0); |
| } |
| return SDL_SetSurfaceColorMod(surface, texture->r, texture->g, |
| texture->b); |
| } |
| |
| static int |
| SW_SetTextureAlphaMod(SDL_Renderer * renderer, SDL_Texture * texture) |
| { |
| SDL_Surface *surface = (SDL_Surface *) texture->driverdata; |
| /* If the texture ever has multiple alpha values (surface alpha plus alpha channel), permanently |
| * disable RLE (which doesn't support this) to avoid potentially frequent RLE encoding/decoding. |
| */ |
| if (texture->a != 255 && surface->format->Amask) { |
| SDL_SetSurfaceRLE(surface, 0); |
| } |
| return SDL_SetSurfaceAlphaMod(surface, texture->a); |
| } |
| |
| static int |
| SW_SetTextureBlendMode(SDL_Renderer * renderer, SDL_Texture * texture) |
| { |
| SDL_Surface *surface = (SDL_Surface *) texture->driverdata; |
| /* If add or mod blending are ever enabled, permanently disable RLE (which doesn't support |
| * them) to avoid potentially frequent RLE encoding/decoding. |
| */ |
| if ((texture->blendMode == SDL_BLENDMODE_ADD || texture->blendMode == SDL_BLENDMODE_MOD)) { |
| SDL_SetSurfaceRLE(surface, 0); |
| } |
| return SDL_SetSurfaceBlendMode(surface, texture->blendMode); |
| } |
| |
| static int |
| SW_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture, |
| const SDL_Rect * rect, const void *pixels, int pitch) |
| { |
| SDL_Surface *surface = (SDL_Surface *) texture->driverdata; |
| Uint8 *src, *dst; |
| int row; |
| size_t length; |
| |
| if(SDL_MUSTLOCK(surface)) |
| SDL_LockSurface(surface); |
| 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; |
| } |
| if(SDL_MUSTLOCK(surface)) |
| SDL_UnlockSurface(surface); |
| return 0; |
| } |
| |
| static int |
| SW_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture, |
| const SDL_Rect * rect, void **pixels, int *pitch) |
| { |
| SDL_Surface *surface = (SDL_Surface *) texture->driverdata; |
| |
| *pixels = |
| (void *) ((Uint8 *) surface->pixels + rect->y * surface->pitch + |
| rect->x * surface->format->BytesPerPixel); |
| *pitch = surface->pitch; |
| return 0; |
| } |
| |
| static void |
| SW_UnlockTexture(SDL_Renderer * renderer, SDL_Texture * texture) |
| { |
| } |
| |
| static int |
| SW_SetRenderTarget(SDL_Renderer * renderer, SDL_Texture * texture) |
| { |
| SW_RenderData *data = (SW_RenderData *) renderer->driverdata; |
| |
| if (texture ) { |
| data->surface = (SDL_Surface *) texture->driverdata; |
| } else { |
| data->surface = data->window; |
| } |
| return 0; |
| } |
| |
| static int |
| SW_UpdateViewport(SDL_Renderer * renderer) |
| { |
| SW_RenderData *data = (SW_RenderData *) renderer->driverdata; |
| SDL_Surface *surface = data->surface; |
| |
| if (!surface) { |
| /* We'll update the viewport after we recreate the surface */ |
| return 0; |
| } |
| |
| SDL_SetClipRect(data->surface, &renderer->viewport); |
| return 0; |
| } |
| |
| static int |
| SW_UpdateClipRect(SDL_Renderer * renderer) |
| { |
| SW_RenderData *data = (SW_RenderData *) renderer->driverdata; |
| SDL_Surface *surface = data->surface; |
| if (surface) { |
| if (renderer->clipping_enabled) { |
| SDL_Rect clip_rect; |
| clip_rect = renderer->clip_rect; |
| clip_rect.x += renderer->viewport.x; |
| clip_rect.y += renderer->viewport.y; |
| SDL_IntersectRect(&renderer->viewport, &clip_rect, &clip_rect); |
| SDL_SetClipRect(surface, &clip_rect); |
| } else { |
| SDL_SetClipRect(surface, &renderer->viewport); |
| } |
| } |
| return 0; |
| } |
| |
| static int |
| SW_RenderClear(SDL_Renderer * renderer) |
| { |
| SDL_Surface *surface = SW_ActivateRenderer(renderer); |
| Uint32 color; |
| SDL_Rect clip_rect; |
| |
| if (!surface) { |
| return -1; |
| } |
| |
| color = SDL_MapRGBA(surface->format, |
| renderer->r, renderer->g, renderer->b, renderer->a); |
| |
| /* By definition the clear ignores the clip rect */ |
| clip_rect = surface->clip_rect; |
| SDL_SetClipRect(surface, NULL); |
| SDL_FillRect(surface, NULL, color); |
| SDL_SetClipRect(surface, &clip_rect); |
| return 0; |
| } |
| |
| static int |
| SW_RenderDrawPoints(SDL_Renderer * renderer, const SDL_FPoint * points, |
| int count) |
| { |
| SDL_Surface *surface = SW_ActivateRenderer(renderer); |
| SDL_Point *final_points; |
| int i, status; |
| |
| if (!surface) { |
| return -1; |
| } |
| |
| final_points = SDL_stack_alloc(SDL_Point, count); |
| if (!final_points) { |
| return SDL_OutOfMemory(); |
| } |
| if (renderer->viewport.x || renderer->viewport.y) { |
| int x = renderer->viewport.x; |
| int y = renderer->viewport.y; |
| |
| for (i = 0; i < count; ++i) { |
| final_points[i].x = (int)(x + points[i].x); |
| final_points[i].y = (int)(y + points[i].y); |
| } |
| } else { |
| for (i = 0; i < count; ++i) { |
| final_points[i].x = (int)points[i].x; |
| final_points[i].y = (int)points[i].y; |
| } |
| } |
| |
| /* Draw the points! */ |
| if (renderer->blendMode == SDL_BLENDMODE_NONE) { |
| Uint32 color = SDL_MapRGBA(surface->format, |
| renderer->r, renderer->g, renderer->b, |
| renderer->a); |
| |
| status = SDL_DrawPoints(surface, final_points, count, color); |
| } else { |
| status = SDL_BlendPoints(surface, final_points, count, |
| renderer->blendMode, |
| renderer->r, renderer->g, renderer->b, |
| renderer->a); |
| } |
| SDL_stack_free(final_points); |
| |
| return status; |
| } |
| |
| static int |
| SW_RenderDrawLines(SDL_Renderer * renderer, const SDL_FPoint * points, |
| int count) |
| { |
| SDL_Surface *surface = SW_ActivateRenderer(renderer); |
| SDL_Point *final_points; |
| int i, status; |
| |
| if (!surface) { |
| return -1; |
| } |
| |
| final_points = SDL_stack_alloc(SDL_Point, count); |
| if (!final_points) { |
| return SDL_OutOfMemory(); |
| } |
| if (renderer->viewport.x || renderer->viewport.y) { |
| int x = renderer->viewport.x; |
| int y = renderer->viewport.y; |
| |
| for (i = 0; i < count; ++i) { |
| final_points[i].x = (int)(x + points[i].x); |
| final_points[i].y = (int)(y + points[i].y); |
| } |
| } else { |
| for (i = 0; i < count; ++i) { |
| final_points[i].x = (int)points[i].x; |
| final_points[i].y = (int)points[i].y; |
| } |
| } |
| |
| /* Draw the lines! */ |
| if (renderer->blendMode == SDL_BLENDMODE_NONE) { |
| Uint32 color = SDL_MapRGBA(surface->format, |
| renderer->r, renderer->g, renderer->b, |
| renderer->a); |
| |
| status = SDL_DrawLines(surface, final_points, count, color); |
| } else { |
| status = SDL_BlendLines(surface, final_points, count, |
| renderer->blendMode, |
| renderer->r, renderer->g, renderer->b, |
| renderer->a); |
| } |
| SDL_stack_free(final_points); |
| |
| return status; |
| } |
| |
| static int |
| SW_RenderFillRects(SDL_Renderer * renderer, const SDL_FRect * rects, int count) |
| { |
| SDL_Surface *surface = SW_ActivateRenderer(renderer); |
| SDL_Rect *final_rects; |
| int i, status; |
| |
| if (!surface) { |
| return -1; |
| } |
| |
| final_rects = SDL_stack_alloc(SDL_Rect, count); |
| if (!final_rects) { |
| return SDL_OutOfMemory(); |
| } |
| if (renderer->viewport.x || renderer->viewport.y) { |
| int x = renderer->viewport.x; |
| int y = renderer->viewport.y; |
| |
| for (i = 0; i < count; ++i) { |
| final_rects[i].x = (int)(x + rects[i].x); |
| final_rects[i].y = (int)(y + rects[i].y); |
| final_rects[i].w = SDL_max((int)rects[i].w, 1); |
| final_rects[i].h = SDL_max((int)rects[i].h, 1); |
| } |
| } else { |
| for (i = 0; i < count; ++i) { |
| final_rects[i].x = (int)rects[i].x; |
| final_rects[i].y = (int)rects[i].y; |
| final_rects[i].w = SDL_max((int)rects[i].w, 1); |
| final_rects[i].h = SDL_max((int)rects[i].h, 1); |
| } |
| } |
| |
| if (renderer->blendMode == SDL_BLENDMODE_NONE) { |
| Uint32 color = SDL_MapRGBA(surface->format, |
| renderer->r, renderer->g, renderer->b, |
| renderer->a); |
| status = SDL_FillRects(surface, final_rects, count, color); |
| } else { |
| status = SDL_BlendFillRects(surface, final_rects, count, |
| renderer->blendMode, |
| renderer->r, renderer->g, renderer->b, |
| renderer->a); |
| } |
| SDL_stack_free(final_rects); |
| |
| return status; |
| } |
| |
| static int |
| SW_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture, |
| const SDL_Rect * srcrect, const SDL_FRect * dstrect) |
| { |
| SDL_Surface *surface = SW_ActivateRenderer(renderer); |
| SDL_Surface *src = (SDL_Surface *) texture->driverdata; |
| SDL_Rect final_rect; |
| |
| if (!surface) { |
| return -1; |
| } |
| |
| if (renderer->viewport.x || renderer->viewport.y) { |
| final_rect.x = (int)(renderer->viewport.x + dstrect->x); |
| final_rect.y = (int)(renderer->viewport.y + dstrect->y); |
| } else { |
| final_rect.x = (int)dstrect->x; |
| final_rect.y = (int)dstrect->y; |
| } |
| final_rect.w = (int)dstrect->w; |
| final_rect.h = (int)dstrect->h; |
| |
| if ( srcrect->w == final_rect.w && srcrect->h == final_rect.h ) { |
| return SDL_BlitSurface(src, srcrect, surface, &final_rect); |
| } else { |
| /* If scaling is ever done, permanently disable RLE (which doesn't support scaling) |
| * to avoid potentially frequent RLE encoding/decoding. |
| */ |
| SDL_SetSurfaceRLE(surface, 0); |
| return SDL_BlitScaled(src, srcrect, surface, &final_rect); |
| } |
| } |
| |
| static int |
| SW_RenderCopyEx(SDL_Renderer * renderer, SDL_Texture * texture, |
| const SDL_Rect * srcrect, const SDL_FRect * dstrect, |
| const double angle, const SDL_FPoint * center, const SDL_RendererFlip flip) |
| { |
| SDL_Surface *surface = SW_ActivateRenderer(renderer); |
| SDL_Surface *src = (SDL_Surface *) texture->driverdata; |
| SDL_Rect final_rect, tmp_rect; |
| SDL_Surface *src_clone, *src_rotated, *src_scaled; |
| SDL_Surface *mask = NULL, *mask_rotated = NULL; |
| int retval = 0, dstwidth, dstheight, abscenterx, abscentery; |
| double cangle, sangle, px, py, p1x, p1y, p2x, p2y, p3x, p3y, p4x, p4y; |
| SDL_BlendMode blendmode; |
| Uint8 alphaMod, rMod, gMod, bMod; |
| int applyModulation = SDL_FALSE; |
| int blitRequired = SDL_FALSE; |
| int isOpaque = SDL_FALSE; |
| |
| if (!surface) { |
| return -1; |
| } |
| |
| if (renderer->viewport.x || renderer->viewport.y) { |
| final_rect.x = (int)(renderer->viewport.x + dstrect->x); |
| final_rect.y = (int)(renderer->viewport.y + dstrect->y); |
| } else { |
| final_rect.x = (int)dstrect->x; |
| final_rect.y = (int)dstrect->y; |
| } |
| final_rect.w = (int)dstrect->w; |
| final_rect.h = (int)dstrect->h; |
| |
| tmp_rect = final_rect; |
| tmp_rect.x = 0; |
| tmp_rect.y = 0; |
| |
| /* It is possible to encounter an RLE encoded surface here and locking it is |
| * necessary because this code is going to access the pixel buffer directly. |
| */ |
| if (SDL_MUSTLOCK(src)) { |
| SDL_LockSurface(src); |
| } |
| |
| /* Clone the source surface but use its pixel buffer directly. |
| * The original source surface must be treated as read-only. |
| */ |
| src_clone = SDL_CreateRGBSurfaceFrom(src->pixels, src->w, src->h, src->format->BitsPerPixel, src->pitch, |
| src->format->Rmask, src->format->Gmask, |
| src->format->Bmask, src->format->Amask); |
| if (src_clone == NULL) { |
| if (SDL_MUSTLOCK(src)) { |
| SDL_UnlockSurface(src); |
| } |
| return -1; |
| } |
| |
| SDL_GetSurfaceBlendMode(src, &blendmode); |
| SDL_GetSurfaceAlphaMod(src, &alphaMod); |
| SDL_GetSurfaceColorMod(src, &rMod, &gMod, &bMod); |
| |
| /* SDLgfx_rotateSurface only accepts 32-bit surfaces with a 8888 layout. Everything else has to be converted. */ |
| if (src->format->BitsPerPixel != 32 || SDL_PIXELLAYOUT(src->format->format) != SDL_PACKEDLAYOUT_8888 || !src->format->Amask) { |
| blitRequired = SDL_TRUE; |
| } |
| |
| /* If scaling and cropping is necessary, it has to be taken care of before the rotation. */ |
| if (!(srcrect->w == final_rect.w && srcrect->h == final_rect.h && srcrect->x == 0 && srcrect->y == 0)) { |
| blitRequired = SDL_TRUE; |
| } |
| |
| /* srcrect is not selecting the whole src surface, so cropping is needed */ |
| if (!(srcrect->w == src->w && srcrect->h == src->h && srcrect->x == 0 && srcrect->y == 0)) { |
| blitRequired = SDL_TRUE; |
| } |
| |
| /* The color and alpha modulation has to be applied before the rotation when using the NONE and MOD blend modes. */ |
| if ((blendmode == SDL_BLENDMODE_NONE || blendmode == SDL_BLENDMODE_MOD) && (alphaMod & rMod & gMod & bMod) != 255) { |
| applyModulation = SDL_TRUE; |
| SDL_SetSurfaceAlphaMod(src_clone, alphaMod); |
| SDL_SetSurfaceColorMod(src_clone, rMod, gMod, bMod); |
| } |
| |
| /* Opaque surfaces are much easier to handle with the NONE blend mode. */ |
| if (blendmode == SDL_BLENDMODE_NONE && !src->format->Amask && alphaMod == 255) { |
| isOpaque = SDL_TRUE; |
| } |
| |
| /* The NONE blend mode requires a mask for non-opaque surfaces. This mask will be used |
| * to clear the pixels in the destination surface. The other steps are explained below. |
| */ |
| if (blendmode == SDL_BLENDMODE_NONE && !isOpaque) { |
| mask = SDL_CreateRGBSurface(0, final_rect.w, final_rect.h, 32, |
| 0x00ff0000, 0x0000ff00, 0x000000ff, 0xff000000); |
| if (mask == NULL) { |
| retval = -1; |
| } else { |
| SDL_SetSurfaceBlendMode(mask, SDL_BLENDMODE_MOD); |
| } |
| } |
| |
| /* Create a new surface should there be a format mismatch or if scaling, cropping, |
| * or modulation is required. It's possible to use the source surface directly otherwise. |
| */ |
| if (!retval && (blitRequired || applyModulation)) { |
| SDL_Rect scale_rect = tmp_rect; |
| src_scaled = SDL_CreateRGBSurface(0, final_rect.w, final_rect.h, 32, |
| 0x00ff0000, 0x0000ff00, 0x000000ff, 0xff000000); |
| if (src_scaled == NULL) { |
| retval = -1; |
| } else { |
| SDL_SetSurfaceBlendMode(src_clone, SDL_BLENDMODE_NONE); |
| retval = SDL_BlitScaled(src_clone, srcrect, src_scaled, &scale_rect); |
| SDL_FreeSurface(src_clone); |
| src_clone = src_scaled; |
| src_scaled = NULL; |
| } |
| } |
| |
| /* SDLgfx_rotateSurface is going to make decisions depending on the blend mode. */ |
| SDL_SetSurfaceBlendMode(src_clone, blendmode); |
| |
| if (!retval) { |
| SDLgfx_rotozoomSurfaceSizeTrig(tmp_rect.w, tmp_rect.h, angle, &dstwidth, &dstheight, &cangle, &sangle); |
| src_rotated = SDLgfx_rotateSurface(src_clone, angle, dstwidth/2, dstheight/2, (texture->scaleMode == SDL_ScaleModeNearest) ? 0 : 1, flip & SDL_FLIP_HORIZONTAL, flip & SDL_FLIP_VERTICAL, dstwidth, dstheight, cangle, sangle); |
| if (src_rotated == NULL) { |
| retval = -1; |
| } |
| if (!retval && mask != NULL) { |
| /* The mask needed for the NONE blend mode gets rotated with the same parameters. */ |
| mask_rotated = SDLgfx_rotateSurface(mask, angle, dstwidth/2, dstheight/2, SDL_FALSE, 0, 0, dstwidth, dstheight, cangle, sangle); |
| if (mask_rotated == NULL) { |
| retval = -1; |
| } |
| } |
| if (!retval) { |
| /* Find out where the new origin is by rotating the four final_rect points around the center and then taking the extremes */ |
| abscenterx = final_rect.x + (int)center->x; |
| abscentery = final_rect.y + (int)center->y; |
| /* Compensate the angle inversion to match the behaviour of the other backends */ |
| sangle = -sangle; |
| |
| /* Top Left */ |
| px = final_rect.x - abscenterx; |
| py = final_rect.y - abscentery; |
| p1x = px * cangle - py * sangle + abscenterx; |
| p1y = px * sangle + py * cangle + abscentery; |
| |
| /* Top Right */ |
| px = final_rect.x + final_rect.w - abscenterx; |
| py = final_rect.y - abscentery; |
| p2x = px * cangle - py * sangle + abscenterx; |
| p2y = px * sangle + py * cangle + abscentery; |
| |
| /* Bottom Left */ |
| px = final_rect.x - abscenterx; |
| py = final_rect.y + final_rect.h - abscentery; |
| p3x = px * cangle - py * sangle + abscenterx; |
| p3y = px * sangle + py * cangle + abscentery; |
| |
| /* Bottom Right */ |
| px = final_rect.x + final_rect.w - abscenterx; |
| py = final_rect.y + final_rect.h - abscentery; |
| p4x = px * cangle - py * sangle + abscenterx; |
| p4y = px * sangle + py * cangle + abscentery; |
| |
| tmp_rect.x = (int)MIN(MIN(p1x, p2x), MIN(p3x, p4x)); |
| tmp_rect.y = (int)MIN(MIN(p1y, p2y), MIN(p3y, p4y)); |
| tmp_rect.w = dstwidth; |
| tmp_rect.h = dstheight; |
| |
| /* The NONE blend mode needs some special care with non-opaque surfaces. |
| * Other blend modes or opaque surfaces can be blitted directly. |
| */ |
| if (blendmode != SDL_BLENDMODE_NONE || isOpaque) { |
| if (applyModulation == SDL_FALSE) { |
| /* If the modulation wasn't already applied, make it happen now. */ |
| SDL_SetSurfaceAlphaMod(src_rotated, alphaMod); |
| SDL_SetSurfaceColorMod(src_rotated, rMod, gMod, bMod); |
| } |
| retval = SDL_BlitSurface(src_rotated, NULL, surface, &tmp_rect); |
| } else { |
| /* The NONE blend mode requires three steps to get the pixels onto the destination surface. |
| * First, the area where the rotated pixels will be blitted to get set to zero. |
| * This is accomplished by simply blitting a mask with the NONE blend mode. |
| * The colorkey set by the rotate function will discard the correct pixels. |
| */ |
| SDL_Rect mask_rect = tmp_rect; |
| SDL_SetSurfaceBlendMode(mask_rotated, SDL_BLENDMODE_NONE); |
| retval = SDL_BlitSurface(mask_rotated, NULL, surface, &mask_rect); |
| if (!retval) { |
| /* The next step copies the alpha value. This is done with the BLEND blend mode and |
| * by modulating the source colors with 0. Since the destination is all zeros, this |
| * will effectively set the destination alpha to the source alpha. |
| */ |
| SDL_SetSurfaceColorMod(src_rotated, 0, 0, 0); |
| mask_rect = tmp_rect; |
| retval = SDL_BlitSurface(src_rotated, NULL, surface, &mask_rect); |
| if (!retval) { |
| /* The last step gets the color values in place. The ADD blend mode simply adds them to |
| * the destination (where the color values are all zero). However, because the ADD blend |
| * mode modulates the colors with the alpha channel, a surface without an alpha mask needs |
| * to be created. This makes all source pixels opaque and the colors get copied correctly. |
| */ |
| SDL_Surface *src_rotated_rgb; |
| src_rotated_rgb = SDL_CreateRGBSurfaceFrom(src_rotated->pixels, src_rotated->w, src_rotated->h, |
| src_rotated->format->BitsPerPixel, src_rotated->pitch, |
| src_rotated->format->Rmask, src_rotated->format->Gmask, |
| src_rotated->format->Bmask, 0); |
| if (src_rotated_rgb == NULL) { |
| retval = -1; |
| } else { |
| SDL_SetSurfaceBlendMode(src_rotated_rgb, SDL_BLENDMODE_ADD); |
| retval = SDL_BlitSurface(src_rotated_rgb, NULL, surface, &tmp_rect); |
| SDL_FreeSurface(src_rotated_rgb); |
| } |
| } |
| } |
| SDL_FreeSurface(mask_rotated); |
| } |
| if (src_rotated != NULL) { |
| SDL_FreeSurface(src_rotated); |
| } |
| } |
| } |
| |
| if (SDL_MUSTLOCK(src)) { |
| SDL_UnlockSurface(src); |
| } |
| if (mask != NULL) { |
| SDL_FreeSurface(mask); |
| } |
| if (src_clone != NULL) { |
| SDL_FreeSurface(src_clone); |
| } |
| return retval; |
| } |
| |
| static int |
| SW_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect, |
| Uint32 format, void * pixels, int pitch) |
| { |
| SDL_Surface *surface = SW_ActivateRenderer(renderer); |
| Uint32 src_format; |
| void *src_pixels; |
| |
| if (!surface) { |
| return -1; |
| } |
| |
| /* NOTE: The rect is already adjusted according to the viewport by |
| * SDL_RenderReadPixels. |
| */ |
| |
| if (rect->x < 0 || rect->x+rect->w > surface->w || |
| rect->y < 0 || rect->y+rect->h > surface->h) { |
| return SDL_SetError("Tried to read outside of surface bounds"); |
| } |
| |
| src_format = surface->format->format; |
| src_pixels = (void*)((Uint8 *) surface->pixels + |
| rect->y * surface->pitch + |
| rect->x * surface->format->BytesPerPixel); |
| |
| return SDL_ConvertPixels(rect->w, rect->h, |
| src_format, src_pixels, surface->pitch, |
| format, pixels, pitch); |
| } |
| |
| static void |
| SW_RenderPresent(SDL_Renderer * renderer) |
| { |
| SDL_Window *window = renderer->window; |
| |
| if (window) { |
| SDL_UpdateWindowSurface(window); |
| } |
| } |
| |
| static void |
| SW_DestroyTexture(SDL_Renderer * renderer, SDL_Texture * texture) |
| { |
| SDL_Surface *surface = (SDL_Surface *) texture->driverdata; |
| |
| SDL_FreeSurface(surface); |
| } |
| |
| static void |
| SW_DestroyRenderer(SDL_Renderer * renderer) |
| { |
| SW_RenderData *data = (SW_RenderData *) renderer->driverdata; |
| |
| SDL_free(data); |
| SDL_free(renderer); |
| } |
| |
| #endif /* !SDL_RENDER_DISABLED */ |
| |
| /* vi: set ts=4 sw=4 expandtab: */ |
