RenderCopyEx,rotation and flipping for all hardware/software backends (#1308)
This commit is contained in:
Gabriel Jacobo
parent
5791b11bc4
commit
17bdcc6e8e
14 changed files with 1550 additions and 10 deletions
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@ -24,6 +24,7 @@
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#include "../SDL_sysrender.h"
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#include "SDL_render_sw_c.h"
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#include "SDL_hints.h"
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#include "SDL_draw.h"
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#include "SDL_blendfillrect.h"
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@ -31,7 +32,7 @@
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#include "SDL_blendpoint.h"
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#include "SDL_drawline.h"
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#include "SDL_drawpoint.h"
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#include "SDL_rotate.h"
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/* SDL surface based renderer implementation */
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@ -62,6 +63,9 @@ static int SW_RenderFillRects(SDL_Renderer * renderer,
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const SDL_Rect * rects, int count);
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static int SW_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
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const SDL_Rect * srcrect, const SDL_Rect * dstrect);
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static int SW_RenderCopyEx(SDL_Renderer * renderer, SDL_Texture * texture,
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const SDL_Rect * srcrect, const SDL_Rect * dstrect,
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const double angle, const SDL_Point * center, const SDL_RendererFlip flip);
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static int SW_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
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Uint32 format, void * pixels, int pitch);
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static void SW_RenderPresent(SDL_Renderer * renderer);
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@ -152,6 +156,7 @@ SW_CreateRendererForSurface(SDL_Surface * surface)
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renderer->RenderDrawLines = SW_RenderDrawLines;
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renderer->RenderFillRects = SW_RenderFillRects;
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renderer->RenderCopy = SW_RenderCopy;
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renderer->RenderCopyEx = SW_RenderCopyEx;
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renderer->RenderReadPixels = SW_RenderReadPixels;
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renderer->RenderPresent = SW_RenderPresent;
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renderer->DestroyTexture = SW_DestroyTexture;
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@ -495,6 +500,102 @@ SW_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
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}
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}
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static int
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GetScaleQuality(void)
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{
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const char *hint = SDL_GetHint(SDL_HINT_RENDER_SCALE_QUALITY);
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if (!hint || *hint == '0' || SDL_strcasecmp(hint, "nearest") == 0) {
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return 0;
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} else {
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return 1;
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}
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}
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static int
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SW_RenderCopyEx(SDL_Renderer * renderer, SDL_Texture * texture,
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const SDL_Rect * srcrect, const SDL_Rect * dstrect,
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const double angle, const SDL_Point * center, const SDL_RendererFlip flip)
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{
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SDL_Surface *surface = SW_ActivateRenderer(renderer);
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SDL_Surface *src = (SDL_Surface *) texture->driverdata;
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SDL_Rect final_rect = *dstrect, tmp_rect;
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SDL_Surface *surface_rotated, *surface_scaled;
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SDL_Point final_rect_center;
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Uint32 colorkey;
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int retval, dstwidth, dstheight, abscenterx, abscentery;
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double cangle, sangle, px, py, p1x, p1y, p2x, p2y, p3x, p3y, p4x, p4y;
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if (!surface) {
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return -1;
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}
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if (renderer->viewport.x || renderer->viewport.y) {
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final_rect.x += renderer->viewport.x;
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final_rect.y += renderer->viewport.y;
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}
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surface_scaled = SDL_CreateRGBSurface(SDL_SWSURFACE, final_rect.w, final_rect.h, src->format->BitsPerPixel,
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src->format->Rmask, src->format->Gmask,
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src->format->Bmask, src->format->Amask );
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SDL_GetColorKey(src, &colorkey);
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SDL_SetColorKey(surface_scaled, SDL_TRUE, colorkey);
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tmp_rect = final_rect;
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tmp_rect.x = 0;
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tmp_rect.y = 0;
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if (surface_scaled) {
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retval = SDL_BlitScaled(src, srcrect, surface_scaled, &tmp_rect);
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if (!retval) {
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_rotozoomSurfaceSizeTrig(tmp_rect.w, tmp_rect.h, -angle, &dstwidth, &dstheight, &cangle, &sangle);
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surface_rotated = _rotateSurface(surface_scaled, -angle, dstwidth/2, dstheight/2, GetScaleQuality(), flip & SDL_FLIP_HORIZONTAL, flip & SDL_FLIP_VERTICAL, dstwidth, dstheight, cangle, sangle);
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if(surface_rotated) {
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/* Find out where the new origin is by rotating the four final_rect points around the center and then taking the extremes */
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abscenterx = final_rect.x + center->x;
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abscentery = final_rect.y + center->y;
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/* Compensate the angle inversion to match the behaviour of the other backends */
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sangle = -sangle;
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/* Top Left */
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px = final_rect.x - abscenterx;
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py = final_rect.y - abscentery;
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p1x = px * cangle - py * sangle + abscenterx;
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p1y = px * sangle + py * cangle + abscentery;
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/* Top Right */
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px = final_rect.x + final_rect.w - abscenterx;
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py = final_rect.y - abscentery;
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p2x = px * cangle - py * sangle + abscenterx;
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p2y = px * sangle + py * cangle + abscentery;
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/* Bottom Left */
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px = final_rect.x - abscenterx;
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py = final_rect.y + final_rect.h - abscentery;
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p3x = px * cangle - py * sangle + abscenterx;
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p3y = px * sangle + py * cangle + abscentery;
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/* Bottom Right */
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px = final_rect.x + final_rect.w - abscenterx;
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py = final_rect.y + final_rect.h - abscentery;
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p4x = px * cangle - py * sangle + abscenterx;
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p4y = px * sangle + py * cangle + abscentery;
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tmp_rect.x = (int)MIN(MIN(p1x, p2x), MIN(p3x, p4x));
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tmp_rect.y = (int)MIN(MIN(p1y, p2y), MIN(p3y, p4y));
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tmp_rect.w = dstwidth;
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tmp_rect.h = dstheight;
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retval = SDL_BlitSurface(surface_rotated, NULL, surface, &tmp_rect);
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SDL_FreeSurface(surface_scaled);
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SDL_FreeSurface(surface_rotated);
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return retval;
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}
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}
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return retval;
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}
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return -1;
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}
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static int
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SW_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
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Uint32 format, void * pixels, int pitch)
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