diff options
Diffstat (limited to 'Source/external/SDL2/src/render/software/SDL_render_sw.c')
| -rw-r--r-- | Source/external/SDL2/src/render/software/SDL_render_sw.c | 887 |
1 files changed, 887 insertions, 0 deletions
diff --git a/Source/external/SDL2/src/render/software/SDL_render_sw.c b/Source/external/SDL2/src/render/software/SDL_render_sw.c new file mode 100644 index 0000000..709dfe8 --- /dev/null +++ b/Source/external/SDL2/src/render/software/SDL_render_sw.c @@ -0,0 +1,887 @@ +/* + 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: */ |