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 --- .../SDL-3.2.8/src/render/software/SDL_blendpoint.c | 376 +++++++++++++++++++++ 1 file changed, 376 insertions(+) create mode 100644 contrib/SDL-3.2.8/src/render/software/SDL_blendpoint.c (limited to 'contrib/SDL-3.2.8/src/render/software/SDL_blendpoint.c') diff --git a/contrib/SDL-3.2.8/src/render/software/SDL_blendpoint.c b/contrib/SDL-3.2.8/src/render/software/SDL_blendpoint.c new file mode 100644 index 0000000..e408453 --- /dev/null +++ b/contrib/SDL-3.2.8/src/render/software/SDL_blendpoint.c @@ -0,0 +1,376 @@ +/* + 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_blendpoint.h" + +static bool SDL_BlendPoint_RGB555(SDL_Surface *dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, + Uint8 g, Uint8 b, Uint8 a) +{ + unsigned inva = 0xff - a; + + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + DRAW_SETPIXELXY_BLEND_RGB555(x, y); + break; + case SDL_BLENDMODE_BLEND_PREMULTIPLIED: + DRAW_SETPIXELXY_BLEND_CLAMPED_RGB555(x, y); + break; + case SDL_BLENDMODE_ADD: + case SDL_BLENDMODE_ADD_PREMULTIPLIED: + DRAW_SETPIXELXY_ADD_RGB555(x, y); + break; + case SDL_BLENDMODE_MOD: + DRAW_SETPIXELXY_MOD_RGB555(x, y); + break; + case SDL_BLENDMODE_MUL: + DRAW_SETPIXELXY_MUL_RGB555(x, y); + break; + default: + DRAW_SETPIXELXY_RGB555(x, y); + break; + } + return true; +} + +static bool SDL_BlendPoint_RGB565(SDL_Surface *dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, + Uint8 g, Uint8 b, Uint8 a) +{ + unsigned inva = 0xff - a; + + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + DRAW_SETPIXELXY_BLEND_RGB565(x, y); + break; + case SDL_BLENDMODE_BLEND_PREMULTIPLIED: + DRAW_SETPIXELXY_BLEND_CLAMPED_RGB565(x, y); + break; + case SDL_BLENDMODE_ADD: + case SDL_BLENDMODE_ADD_PREMULTIPLIED: + DRAW_SETPIXELXY_ADD_RGB565(x, y); + break; + case SDL_BLENDMODE_MOD: + DRAW_SETPIXELXY_MOD_RGB565(x, y); + break; + case SDL_BLENDMODE_MUL: + DRAW_SETPIXELXY_MUL_RGB565(x, y); + break; + default: + DRAW_SETPIXELXY_RGB565(x, y); + break; + } + return true; +} + +static bool SDL_BlendPoint_XRGB8888(SDL_Surface *dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, + Uint8 g, Uint8 b, Uint8 a) +{ + unsigned inva = 0xff - a; + + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + DRAW_SETPIXELXY_BLEND_XRGB8888(x, y); + break; + case SDL_BLENDMODE_BLEND_PREMULTIPLIED: + DRAW_SETPIXELXY_BLEND_CLAMPED_XRGB8888(x, y); + break; + case SDL_BLENDMODE_ADD: + case SDL_BLENDMODE_ADD_PREMULTIPLIED: + DRAW_SETPIXELXY_ADD_XRGB8888(x, y); + break; + case SDL_BLENDMODE_MOD: + DRAW_SETPIXELXY_MOD_XRGB8888(x, y); + break; + case SDL_BLENDMODE_MUL: + DRAW_SETPIXELXY_MUL_XRGB8888(x, y); + break; + default: + DRAW_SETPIXELXY_XRGB8888(x, y); + break; + } + return true; +} + +static bool SDL_BlendPoint_ARGB8888(SDL_Surface *dst, int x, int y, SDL_BlendMode blendMode, + Uint8 r, Uint8 g, Uint8 b, Uint8 a) +{ + unsigned inva = 0xff - a; + + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + DRAW_SETPIXELXY_BLEND_ARGB8888(x, y); + break; + case SDL_BLENDMODE_BLEND_PREMULTIPLIED: + DRAW_SETPIXELXY_BLEND_CLAMPED_ARGB8888(x, y); + break; + case SDL_BLENDMODE_ADD: + case SDL_BLENDMODE_ADD_PREMULTIPLIED: + DRAW_SETPIXELXY_ADD_ARGB8888(x, y); + break; + case SDL_BLENDMODE_MOD: + DRAW_SETPIXELXY_MOD_ARGB8888(x, y); + break; + case SDL_BLENDMODE_MUL: + DRAW_SETPIXELXY_MUL_ARGB8888(x, y); + break; + default: + DRAW_SETPIXELXY_ARGB8888(x, y); + break; + } + return true; +} + +static bool SDL_BlendPoint_RGB(SDL_Surface *dst, int x, int y, 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: + DRAW_SETPIXELXY2_BLEND_RGB(x, y); + break; + case SDL_BLENDMODE_BLEND_PREMULTIPLIED: + DRAW_SETPIXELXY2_BLEND_CLAMPED_RGB(x, y); + break; + case SDL_BLENDMODE_ADD: + case SDL_BLENDMODE_ADD_PREMULTIPLIED: + DRAW_SETPIXELXY2_ADD_RGB(x, y); + break; + case SDL_BLENDMODE_MOD: + DRAW_SETPIXELXY2_MOD_RGB(x, y); + break; + case SDL_BLENDMODE_MUL: + DRAW_SETPIXELXY2_MUL_RGB(x, y); + break; + default: + DRAW_SETPIXELXY2_RGB(x, y); + break; + } + return true; + case 4: + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + DRAW_SETPIXELXY4_BLEND_RGB(x, y); + break; + case SDL_BLENDMODE_BLEND_PREMULTIPLIED: + DRAW_SETPIXELXY4_BLEND_CLAMPED_RGB(x, y); + break; + case SDL_BLENDMODE_ADD: + case SDL_BLENDMODE_ADD_PREMULTIPLIED: + DRAW_SETPIXELXY4_ADD_RGB(x, y); + break; + case SDL_BLENDMODE_MOD: + DRAW_SETPIXELXY4_MOD_RGB(x, y); + break; + case SDL_BLENDMODE_MUL: + DRAW_SETPIXELXY4_MUL_RGB(x, y); + break; + default: + DRAW_SETPIXELXY4_RGB(x, y); + break; + } + return true; + default: + return SDL_Unsupported(); + } +} + +static bool SDL_BlendPoint_RGBA(SDL_Surface *dst, int x, int y, 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: + DRAW_SETPIXELXY4_BLEND_RGBA(x, y); + break; + case SDL_BLENDMODE_BLEND_PREMULTIPLIED: + DRAW_SETPIXELXY4_BLEND_CLAMPED_RGBA(x, y); + break; + case SDL_BLENDMODE_ADD: + case SDL_BLENDMODE_ADD_PREMULTIPLIED: + DRAW_SETPIXELXY4_ADD_RGBA(x, y); + break; + case SDL_BLENDMODE_MOD: + DRAW_SETPIXELXY4_MOD_RGBA(x, y); + break; + case SDL_BLENDMODE_MUL: + DRAW_SETPIXELXY4_MUL_RGBA(x, y); + break; + default: + DRAW_SETPIXELXY4_RGBA(x, y); + break; + } + return true; + default: + return SDL_Unsupported(); + } +} + +bool SDL_BlendPoint(SDL_Surface *dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) +{ + if (!SDL_SurfaceValid(dst)) { + return SDL_InvalidParamError("SDL_BlendPoint(): dst"); + } + + // This function doesn't work on surfaces < 8 bpp + if (SDL_BITSPERPIXEL(dst->format) < 8) { + return SDL_SetError("SDL_BlendPoint(): Unsupported surface format"); + } + + // Perform clipping + if (x < dst->clip_rect.x || y < dst->clip_rect.y || + x >= (dst->clip_rect.x + dst->clip_rect.w) || + y >= (dst->clip_rect.y + dst->clip_rect.h)) { + return true; + } + + 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_BlendPoint_RGB555(dst, x, y, blendMode, r, g, b, a); + } + break; + case 16: + switch (dst->fmt->Rmask) { + case 0xF800: + return SDL_BlendPoint_RGB565(dst, x, y, blendMode, r, g, b, a); + } + break; + case 32: + switch (dst->fmt->Rmask) { + case 0x00FF0000: + if (!dst->fmt->Amask) { + return SDL_BlendPoint_XRGB8888(dst, x, y, blendMode, r, g, b, a); + } else { + return SDL_BlendPoint_ARGB8888(dst, x, y, blendMode, r, g, b, a); + } + // break; -Wunreachable-code-break + } + break; + default: + break; + } + + if (!dst->fmt->Amask) { + return SDL_BlendPoint_RGB(dst, x, y, blendMode, r, g, b, a); + } else { + return SDL_BlendPoint_RGBA(dst, x, y, blendMode, r, g, b, a); + } +} + +bool SDL_BlendPoints(SDL_Surface *dst, const SDL_Point *points, int count, SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) +{ + int minx, miny; + int maxx, maxy; + int i; + int x, y; + bool (*func)(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) = NULL; + bool result = true; + + if (!SDL_SurfaceValid(dst)) { + return SDL_InvalidParamError("SDL_BlendPoints(): dst"); + } + + // This function doesn't work on surfaces < 8 bpp + if (dst->fmt->bits_per_pixel < 8) { + return SDL_SetError("SDL_BlendPoints(): 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_BlendPoint_RGB555; + break; + } + break; + case 16: + switch (dst->fmt->Rmask) { + case 0xF800: + func = SDL_BlendPoint_RGB565; + break; + } + break; + case 32: + switch (dst->fmt->Rmask) { + case 0x00FF0000: + if (!dst->fmt->Amask) { + func = SDL_BlendPoint_XRGB8888; + } else { + func = SDL_BlendPoint_ARGB8888; + } + break; + } + break; + default: + break; + } + + if (!func) { + if (!dst->fmt->Amask) { + func = SDL_BlendPoint_RGB; + } else { + func = SDL_BlendPoint_RGBA; + } + } + + minx = dst->clip_rect.x; + maxx = dst->clip_rect.x + dst->clip_rect.w - 1; + miny = dst->clip_rect.y; + maxy = dst->clip_rect.y + dst->clip_rect.h - 1; + + for (i = 0; i < count; ++i) { + x = points[i].x; + y = points[i].y; + + if (x < minx || x > maxx || y < miny || y > maxy) { + continue; + } + result = func(dst, x, y, blendMode, r, g, b, a); + } + return result; +} + +#endif // SDL_VIDEO_RENDER_SW -- cgit v1.2.3