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This commit is contained in:
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/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "SDL_internal.h"
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#ifdef SDL_VIDEO_RENDER_SW
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#include "SDL_draw.h"
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#include "SDL_blendfillrect.h"
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static bool SDL_BlendFillRect_RGB555(SDL_Surface *dst, const SDL_Rect *rect,
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SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
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{
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unsigned inva = 0xff - a;
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switch (blendMode) {
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case SDL_BLENDMODE_BLEND:
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FILLRECT(Uint16, DRAW_SETPIXEL_BLEND_RGB555);
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break;
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case SDL_BLENDMODE_BLEND_PREMULTIPLIED:
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FILLRECT(Uint16, DRAW_SETPIXEL_BLEND_CLAMPED_RGB555);
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break;
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case SDL_BLENDMODE_ADD:
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case SDL_BLENDMODE_ADD_PREMULTIPLIED:
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FILLRECT(Uint16, DRAW_SETPIXEL_ADD_RGB555);
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break;
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case SDL_BLENDMODE_MOD:
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FILLRECT(Uint16, DRAW_SETPIXEL_MOD_RGB555);
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break;
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case SDL_BLENDMODE_MUL:
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FILLRECT(Uint16, DRAW_SETPIXEL_MUL_RGB555);
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break;
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default:
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FILLRECT(Uint16, DRAW_SETPIXEL_RGB555);
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break;
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}
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return true;
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}
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static bool SDL_BlendFillRect_RGB565(SDL_Surface *dst, const SDL_Rect *rect,
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SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
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{
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unsigned inva = 0xff - a;
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switch (blendMode) {
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case SDL_BLENDMODE_BLEND:
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FILLRECT(Uint16, DRAW_SETPIXEL_BLEND_RGB565);
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break;
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case SDL_BLENDMODE_BLEND_PREMULTIPLIED:
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FILLRECT(Uint16, DRAW_SETPIXEL_BLEND_CLAMPED_RGB565);
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break;
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case SDL_BLENDMODE_ADD:
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case SDL_BLENDMODE_ADD_PREMULTIPLIED:
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FILLRECT(Uint16, DRAW_SETPIXEL_ADD_RGB565);
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break;
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case SDL_BLENDMODE_MOD:
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FILLRECT(Uint16, DRAW_SETPIXEL_MOD_RGB565);
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break;
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case SDL_BLENDMODE_MUL:
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FILLRECT(Uint16, DRAW_SETPIXEL_MUL_RGB565);
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break;
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default:
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FILLRECT(Uint16, DRAW_SETPIXEL_RGB565);
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break;
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}
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return true;
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}
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static bool SDL_BlendFillRect_XRGB8888(SDL_Surface *dst, const SDL_Rect *rect,
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SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
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{
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unsigned inva = 0xff - a;
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switch (blendMode) {
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case SDL_BLENDMODE_BLEND:
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FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_XRGB8888);
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break;
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case SDL_BLENDMODE_BLEND_PREMULTIPLIED:
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FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_CLAMPED_XRGB8888);
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break;
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case SDL_BLENDMODE_ADD:
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case SDL_BLENDMODE_ADD_PREMULTIPLIED:
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FILLRECT(Uint32, DRAW_SETPIXEL_ADD_XRGB8888);
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break;
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case SDL_BLENDMODE_MOD:
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FILLRECT(Uint32, DRAW_SETPIXEL_MOD_XRGB8888);
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break;
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case SDL_BLENDMODE_MUL:
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FILLRECT(Uint32, DRAW_SETPIXEL_MUL_XRGB8888);
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break;
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default:
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FILLRECT(Uint32, DRAW_SETPIXEL_XRGB8888);
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break;
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}
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return true;
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}
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static bool SDL_BlendFillRect_ARGB8888(SDL_Surface *dst, const SDL_Rect *rect,
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SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
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{
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unsigned inva = 0xff - a;
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switch (blendMode) {
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case SDL_BLENDMODE_BLEND:
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FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_ARGB8888);
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break;
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case SDL_BLENDMODE_BLEND_PREMULTIPLIED:
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FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_CLAMPED_ARGB8888);
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break;
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case SDL_BLENDMODE_ADD:
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case SDL_BLENDMODE_ADD_PREMULTIPLIED:
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FILLRECT(Uint32, DRAW_SETPIXEL_ADD_ARGB8888);
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break;
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case SDL_BLENDMODE_MOD:
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FILLRECT(Uint32, DRAW_SETPIXEL_MOD_ARGB8888);
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break;
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case SDL_BLENDMODE_MUL:
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FILLRECT(Uint32, DRAW_SETPIXEL_MUL_ARGB8888);
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break;
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default:
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FILLRECT(Uint32, DRAW_SETPIXEL_ARGB8888);
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break;
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}
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return true;
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}
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static bool SDL_BlendFillRect_RGB(SDL_Surface *dst, const SDL_Rect *rect,
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SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
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{
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const SDL_PixelFormatDetails *fmt = dst->fmt;
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unsigned inva = 0xff - a;
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switch (fmt->bytes_per_pixel) {
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case 2:
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switch (blendMode) {
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case SDL_BLENDMODE_BLEND:
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FILLRECT(Uint16, DRAW_SETPIXEL_BLEND_RGB);
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break;
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case SDL_BLENDMODE_BLEND_PREMULTIPLIED:
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FILLRECT(Uint16, DRAW_SETPIXEL_BLEND_CLAMPED_RGB);
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break;
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case SDL_BLENDMODE_ADD:
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case SDL_BLENDMODE_ADD_PREMULTIPLIED:
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FILLRECT(Uint16, DRAW_SETPIXEL_ADD_RGB);
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break;
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case SDL_BLENDMODE_MOD:
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FILLRECT(Uint16, DRAW_SETPIXEL_MOD_RGB);
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break;
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case SDL_BLENDMODE_MUL:
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FILLRECT(Uint16, DRAW_SETPIXEL_MUL_RGB);
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break;
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default:
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FILLRECT(Uint16, DRAW_SETPIXEL_RGB);
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break;
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}
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return true;
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case 4:
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switch (blendMode) {
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case SDL_BLENDMODE_BLEND:
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FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_RGB);
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break;
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case SDL_BLENDMODE_BLEND_PREMULTIPLIED:
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FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_CLAMPED_RGB);
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break;
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case SDL_BLENDMODE_ADD:
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case SDL_BLENDMODE_ADD_PREMULTIPLIED:
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FILLRECT(Uint32, DRAW_SETPIXEL_ADD_RGB);
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break;
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case SDL_BLENDMODE_MOD:
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FILLRECT(Uint32, DRAW_SETPIXEL_MOD_RGB);
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break;
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case SDL_BLENDMODE_MUL:
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FILLRECT(Uint32, DRAW_SETPIXEL_MUL_RGB);
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break;
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default:
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FILLRECT(Uint32, DRAW_SETPIXEL_RGB);
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break;
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}
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return true;
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default:
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return SDL_Unsupported();
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}
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}
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static bool SDL_BlendFillRect_RGBA(SDL_Surface *dst, const SDL_Rect *rect,
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SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
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{
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const SDL_PixelFormatDetails *fmt = dst->fmt;
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unsigned inva = 0xff - a;
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switch (fmt->bytes_per_pixel) {
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case 4:
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switch (blendMode) {
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case SDL_BLENDMODE_BLEND:
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FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_RGBA);
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break;
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case SDL_BLENDMODE_BLEND_PREMULTIPLIED:
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FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_CLAMPED_RGBA);
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break;
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case SDL_BLENDMODE_ADD:
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case SDL_BLENDMODE_ADD_PREMULTIPLIED:
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FILLRECT(Uint32, DRAW_SETPIXEL_ADD_RGBA);
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break;
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case SDL_BLENDMODE_MOD:
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FILLRECT(Uint32, DRAW_SETPIXEL_MOD_RGBA);
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break;
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case SDL_BLENDMODE_MUL:
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FILLRECT(Uint32, DRAW_SETPIXEL_MUL_RGBA);
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break;
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default:
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FILLRECT(Uint32, DRAW_SETPIXEL_RGBA);
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break;
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}
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return true;
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default:
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return SDL_Unsupported();
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}
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}
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bool SDL_BlendFillRect(SDL_Surface *dst, const SDL_Rect *rect, SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
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{
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SDL_Rect clipped;
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if (!SDL_SurfaceValid(dst)) {
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return SDL_InvalidParamError("SDL_BlendFillRect(): dst");
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}
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// This function doesn't work on surfaces < 8 bpp
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if (SDL_BITSPERPIXEL(dst->format) < 8) {
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return SDL_SetError("SDL_BlendFillRect(): Unsupported surface format");
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}
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// If 'rect' == NULL, then fill the whole surface
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if (rect) {
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// Perform clipping
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if (!SDL_GetRectIntersection(rect, &dst->clip_rect, &clipped)) {
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return true;
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}
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rect = &clipped;
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} else {
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rect = &dst->clip_rect;
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}
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if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) {
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r = DRAW_MUL(r, a);
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g = DRAW_MUL(g, a);
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b = DRAW_MUL(b, a);
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}
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switch (dst->fmt->bits_per_pixel) {
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case 15:
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switch (dst->fmt->Rmask) {
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case 0x7C00:
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return SDL_BlendFillRect_RGB555(dst, rect, blendMode, r, g, b, a);
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}
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break;
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case 16:
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switch (dst->fmt->Rmask) {
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case 0xF800:
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return SDL_BlendFillRect_RGB565(dst, rect, blendMode, r, g, b, a);
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}
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break;
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case 32:
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switch (dst->fmt->Rmask) {
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case 0x00FF0000:
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if (!dst->fmt->Amask) {
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return SDL_BlendFillRect_XRGB8888(dst, rect, blendMode, r, g, b, a);
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} else {
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return SDL_BlendFillRect_ARGB8888(dst, rect, blendMode, r, g, b, a);
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}
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// break; -Wunreachable-code-break
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}
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break;
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default:
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break;
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}
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if (!dst->fmt->Amask) {
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return SDL_BlendFillRect_RGB(dst, rect, blendMode, r, g, b, a);
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} else {
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return SDL_BlendFillRect_RGBA(dst, rect, blendMode, r, g, b, a);
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}
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}
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bool SDL_BlendFillRects(SDL_Surface *dst, const SDL_Rect *rects, int count, SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
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{
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SDL_Rect rect;
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int i;
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bool (*func)(SDL_Surface * dst, const SDL_Rect *rect, SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) = NULL;
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bool result = true;
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if (!SDL_SurfaceValid(dst)) {
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return SDL_InvalidParamError("SDL_BlendFillRects(): dst");
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}
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// This function doesn't work on surfaces < 8 bpp
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if (dst->fmt->bits_per_pixel < 8) {
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return SDL_SetError("SDL_BlendFillRects(): Unsupported surface format");
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}
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if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) {
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r = DRAW_MUL(r, a);
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g = DRAW_MUL(g, a);
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b = DRAW_MUL(b, a);
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}
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// FIXME: Does this function pointer slow things down significantly?
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switch (dst->fmt->bits_per_pixel) {
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case 15:
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switch (dst->fmt->Rmask) {
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case 0x7C00:
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func = SDL_BlendFillRect_RGB555;
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}
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break;
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case 16:
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switch (dst->fmt->Rmask) {
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case 0xF800:
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func = SDL_BlendFillRect_RGB565;
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}
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break;
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case 32:
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switch (dst->fmt->Rmask) {
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case 0x00FF0000:
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if (!dst->fmt->Amask) {
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func = SDL_BlendFillRect_XRGB8888;
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} else {
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func = SDL_BlendFillRect_ARGB8888;
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}
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break;
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}
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break;
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default:
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break;
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}
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if (!func) {
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if (!dst->fmt->Amask) {
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func = SDL_BlendFillRect_RGB;
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} else {
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func = SDL_BlendFillRect_RGBA;
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}
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}
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for (i = 0; i < count; ++i) {
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// Perform clipping
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if (!SDL_GetRectIntersection(&rects[i], &dst->clip_rect, &rect)) {
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continue;
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}
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result = func(dst, &rect, blendMode, r, g, b, a);
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}
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return result;
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}
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#endif // SDL_VIDEO_RENDER_SW
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Reference in New Issue
Block a user