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/AliOS-Things-master/components/SDL2/src/render/software/
A DSDL_render_sw.c346 int retval = 0, dstwidth, dstheight, abscenterx, abscentery; in SW_RenderCopyEx() local
464 abscentery = final_rect->y + (int)center->y; in SW_RenderCopyEx()
470 py = final_rect->y - abscentery; in SW_RenderCopyEx()
472 p1y = px * sangle + py * cangle + abscentery; in SW_RenderCopyEx()
476 py = final_rect->y - abscentery; in SW_RenderCopyEx()
478 p2y = px * sangle + py * cangle + abscentery; in SW_RenderCopyEx()
482 py = final_rect->y + final_rect->h - abscentery; in SW_RenderCopyEx()
484 p3y = px * sangle + py * cangle + abscentery; in SW_RenderCopyEx()
488 py = final_rect->y + final_rect->h - abscentery; in SW_RenderCopyEx()
490 p4y = px * sangle + py * cangle + abscentery; in SW_RenderCopyEx()

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