From 5a079a2d114f96d4847d1ee305d5b7c16eeec50e Mon Sep 17 00:00:00 2001 From: 3gg <3gg@shellblade.net> Date: Sat, 27 Dec 2025 12:03:39 -0800 Subject: Initial commit --- .../src/render/software/SDL_blendfillrect.c | 371 +++++++++++++++++++++ 1 file changed, 371 insertions(+) create mode 100644 contrib/SDL-3.2.8/src/render/software/SDL_blendfillrect.c (limited to 'contrib/SDL-3.2.8/src/render/software/SDL_blendfillrect.c') diff --git a/contrib/SDL-3.2.8/src/render/software/SDL_blendfillrect.c b/contrib/SDL-3.2.8/src/render/software/SDL_blendfillrect.c new file mode 100644 index 0000000..4e5c7f8 --- /dev/null +++ b/contrib/SDL-3.2.8/src/render/software/SDL_blendfillrect.c @@ -0,0 +1,371 @@ +/* + Simple DirectMedia Layer + Copyright (C) 1997-2025 Sam Lantinga + + 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" + +#ifdef SDL_VIDEO_RENDER_SW + +#include "SDL_draw.h" +#include "SDL_blendfillrect.h" + +static bool SDL_BlendFillRect_RGB555(SDL_Surface *dst, const SDL_Rect *rect, + SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) +{ + unsigned inva = 0xff - a; + + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + FILLRECT(Uint16, DRAW_SETPIXEL_BLEND_RGB555); + break; + case SDL_BLENDMODE_BLEND_PREMULTIPLIED: + FILLRECT(Uint16, DRAW_SETPIXEL_BLEND_CLAMPED_RGB555); + break; + case SDL_BLENDMODE_ADD: + case SDL_BLENDMODE_ADD_PREMULTIPLIED: + FILLRECT(Uint16, DRAW_SETPIXEL_ADD_RGB555); + break; + case SDL_BLENDMODE_MOD: + FILLRECT(Uint16, DRAW_SETPIXEL_MOD_RGB555); + break; + case SDL_BLENDMODE_MUL: + FILLRECT(Uint16, DRAW_SETPIXEL_MUL_RGB555); + break; + default: + FILLRECT(Uint16, DRAW_SETPIXEL_RGB555); + break; + } + return true; +} + +static bool SDL_BlendFillRect_RGB565(SDL_Surface *dst, const SDL_Rect *rect, + SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) +{ + unsigned inva = 0xff - a; + + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + FILLRECT(Uint16, DRAW_SETPIXEL_BLEND_RGB565); + break; + case SDL_BLENDMODE_BLEND_PREMULTIPLIED: + FILLRECT(Uint16, DRAW_SETPIXEL_BLEND_CLAMPED_RGB565); + break; + case SDL_BLENDMODE_ADD: + case SDL_BLENDMODE_ADD_PREMULTIPLIED: + FILLRECT(Uint16, DRAW_SETPIXEL_ADD_RGB565); + break; + case SDL_BLENDMODE_MOD: + FILLRECT(Uint16, DRAW_SETPIXEL_MOD_RGB565); + break; + case SDL_BLENDMODE_MUL: + FILLRECT(Uint16, DRAW_SETPIXEL_MUL_RGB565); + break; + default: + FILLRECT(Uint16, DRAW_SETPIXEL_RGB565); + break; + } + return true; +} + +static bool SDL_BlendFillRect_XRGB8888(SDL_Surface *dst, const SDL_Rect *rect, + SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) +{ + unsigned inva = 0xff - a; + + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_XRGB8888); + break; + case SDL_BLENDMODE_BLEND_PREMULTIPLIED: + FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_CLAMPED_XRGB8888); + break; + case SDL_BLENDMODE_ADD: + case SDL_BLENDMODE_ADD_PREMULTIPLIED: + FILLRECT(Uint32, DRAW_SETPIXEL_ADD_XRGB8888); + break; + case SDL_BLENDMODE_MOD: + FILLRECT(Uint32, DRAW_SETPIXEL_MOD_XRGB8888); + break; + case SDL_BLENDMODE_MUL: + FILLRECT(Uint32, DRAW_SETPIXEL_MUL_XRGB8888); + break; + default: + FILLRECT(Uint32, DRAW_SETPIXEL_XRGB8888); + break; + } + return true; +} + +static bool SDL_BlendFillRect_ARGB8888(SDL_Surface *dst, const SDL_Rect *rect, + SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) +{ + unsigned inva = 0xff - a; + + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_ARGB8888); + break; + case SDL_BLENDMODE_BLEND_PREMULTIPLIED: + FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_CLAMPED_ARGB8888); + break; + case SDL_BLENDMODE_ADD: + case SDL_BLENDMODE_ADD_PREMULTIPLIED: + FILLRECT(Uint32, DRAW_SETPIXEL_ADD_ARGB8888); + break; + case SDL_BLENDMODE_MOD: + FILLRECT(Uint32, DRAW_SETPIXEL_MOD_ARGB8888); + break; + case SDL_BLENDMODE_MUL: + FILLRECT(Uint32, DRAW_SETPIXEL_MUL_ARGB8888); + break; + default: + FILLRECT(Uint32, DRAW_SETPIXEL_ARGB8888); + break; + } + return true; +} + +static bool SDL_BlendFillRect_RGB(SDL_Surface *dst, const SDL_Rect *rect, + SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) +{ + const SDL_PixelFormatDetails *fmt = dst->fmt; + unsigned inva = 0xff - a; + + switch (fmt->bytes_per_pixel) { + case 2: + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + FILLRECT(Uint16, DRAW_SETPIXEL_BLEND_RGB); + break; + case SDL_BLENDMODE_BLEND_PREMULTIPLIED: + FILLRECT(Uint16, DRAW_SETPIXEL_BLEND_CLAMPED_RGB); + break; + case SDL_BLENDMODE_ADD: + case SDL_BLENDMODE_ADD_PREMULTIPLIED: + FILLRECT(Uint16, DRAW_SETPIXEL_ADD_RGB); + break; + case SDL_BLENDMODE_MOD: + FILLRECT(Uint16, DRAW_SETPIXEL_MOD_RGB); + break; + case SDL_BLENDMODE_MUL: + FILLRECT(Uint16, DRAW_SETPIXEL_MUL_RGB); + break; + default: + FILLRECT(Uint16, DRAW_SETPIXEL_RGB); + break; + } + return true; + case 4: + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_RGB); + break; + case SDL_BLENDMODE_BLEND_PREMULTIPLIED: + FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_CLAMPED_RGB); + break; + case SDL_BLENDMODE_ADD: + case SDL_BLENDMODE_ADD_PREMULTIPLIED: + FILLRECT(Uint32, DRAW_SETPIXEL_ADD_RGB); + break; + case SDL_BLENDMODE_MOD: + FILLRECT(Uint32, DRAW_SETPIXEL_MOD_RGB); + break; + case SDL_BLENDMODE_MUL: + FILLRECT(Uint32, DRAW_SETPIXEL_MUL_RGB); + break; + default: + FILLRECT(Uint32, DRAW_SETPIXEL_RGB); + break; + } + return true; + default: + return SDL_Unsupported(); + } +} + +static bool SDL_BlendFillRect_RGBA(SDL_Surface *dst, const SDL_Rect *rect, + SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) +{ + const SDL_PixelFormatDetails *fmt = dst->fmt; + unsigned inva = 0xff - a; + + switch (fmt->bytes_per_pixel) { + case 4: + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_RGBA); + break; + case SDL_BLENDMODE_BLEND_PREMULTIPLIED: + FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_CLAMPED_RGBA); + break; + case SDL_BLENDMODE_ADD: + case SDL_BLENDMODE_ADD_PREMULTIPLIED: + FILLRECT(Uint32, DRAW_SETPIXEL_ADD_RGBA); + break; + case SDL_BLENDMODE_MOD: + FILLRECT(Uint32, DRAW_SETPIXEL_MOD_RGBA); + break; + case SDL_BLENDMODE_MUL: + FILLRECT(Uint32, DRAW_SETPIXEL_MUL_RGBA); + break; + default: + FILLRECT(Uint32, DRAW_SETPIXEL_RGBA); + break; + } + return true; + default: + return SDL_Unsupported(); + } +} + +bool SDL_BlendFillRect(SDL_Surface *dst, const SDL_Rect *rect, SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) +{ + SDL_Rect clipped; + + if (!SDL_SurfaceValid(dst)) { + return SDL_InvalidParamError("SDL_BlendFillRect(): dst"); + } + + // This function doesn't work on surfaces < 8 bpp + if (SDL_BITSPERPIXEL(dst->format) < 8) { + return SDL_SetError("SDL_BlendFillRect(): Unsupported surface format"); + } + + // If 'rect' == NULL, then fill the whole surface + if (rect) { + // Perform clipping + if (!SDL_GetRectIntersection(rect, &dst->clip_rect, &clipped)) { + return true; + } + rect = &clipped; + } else { + rect = &dst->clip_rect; + } + + if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) { + r = DRAW_MUL(r, a); + g = DRAW_MUL(g, a); + b = DRAW_MUL(b, a); + } + + switch (dst->fmt->bits_per_pixel) { + case 15: + switch (dst->fmt->Rmask) { + case 0x7C00: + return SDL_BlendFillRect_RGB555(dst, rect, blendMode, r, g, b, a); + } + break; + case 16: + switch (dst->fmt->Rmask) { + case 0xF800: + return SDL_BlendFillRect_RGB565(dst, rect, blendMode, r, g, b, a); + } + break; + case 32: + switch (dst->fmt->Rmask) { + case 0x00FF0000: + if (!dst->fmt->Amask) { + return SDL_BlendFillRect_XRGB8888(dst, rect, blendMode, r, g, b, a); + } else { + return SDL_BlendFillRect_ARGB8888(dst, rect, blendMode, r, g, b, a); + } + // break; -Wunreachable-code-break + } + break; + default: + break; + } + + if (!dst->fmt->Amask) { + return SDL_BlendFillRect_RGB(dst, rect, blendMode, r, g, b, a); + } else { + return SDL_BlendFillRect_RGBA(dst, rect, blendMode, r, g, b, a); + } +} + +bool SDL_BlendFillRects(SDL_Surface *dst, const SDL_Rect *rects, int count, SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) +{ + SDL_Rect rect; + int i; + bool (*func)(SDL_Surface * dst, const SDL_Rect *rect, SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) = NULL; + bool result = true; + + if (!SDL_SurfaceValid(dst)) { + return SDL_InvalidParamError("SDL_BlendFillRects(): dst"); + } + + // This function doesn't work on surfaces < 8 bpp + if (dst->fmt->bits_per_pixel < 8) { + return SDL_SetError("SDL_BlendFillRects(): Unsupported surface format"); + } + + if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) { + r = DRAW_MUL(r, a); + g = DRAW_MUL(g, a); + b = DRAW_MUL(b, a); + } + + // FIXME: Does this function pointer slow things down significantly? + switch (dst->fmt->bits_per_pixel) { + case 15: + switch (dst->fmt->Rmask) { + case 0x7C00: + func = SDL_BlendFillRect_RGB555; + } + break; + case 16: + switch (dst->fmt->Rmask) { + case 0xF800: + func = SDL_BlendFillRect_RGB565; + } + break; + case 32: + switch (dst->fmt->Rmask) { + case 0x00FF0000: + if (!dst->fmt->Amask) { + func = SDL_BlendFillRect_XRGB8888; + } else { + func = SDL_BlendFillRect_ARGB8888; + } + break; + } + break; + default: + break; + } + + if (!func) { + if (!dst->fmt->Amask) { + func = SDL_BlendFillRect_RGB; + } else { + func = SDL_BlendFillRect_RGBA; + } + } + + for (i = 0; i < count; ++i) { + // Perform clipping + if (!SDL_GetRectIntersection(&rects[i], &dst->clip_rect, &rect)) { + continue; + } + result = func(dst, &rect, blendMode, r, g, b, a); + } + return result; +} + +#endif // SDL_VIDEO_RENDER_SW -- cgit v1.2.3