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_blendline.c | 986 +++++++++++++++++++++ 1 file changed, 986 insertions(+) create mode 100644 contrib/SDL-3.2.8/src/render/software/SDL_blendline.c (limited to 'contrib/SDL-3.2.8/src/render/software/SDL_blendline.c') diff --git a/contrib/SDL-3.2.8/src/render/software/SDL_blendline.c b/contrib/SDL-3.2.8/src/render/software/SDL_blendline.c new file mode 100644 index 0000000..53be2f1 --- /dev/null +++ b/contrib/SDL-3.2.8/src/render/software/SDL_blendline.c @@ -0,0 +1,986 @@ +/* + 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_blendline.h" +#include "SDL_blendpoint.h" + +static void SDL_BlendLine_RGB2(SDL_Surface *dst, int x1, int y1, int x2, int y2, + SDL_BlendMode blendMode, Uint8 _r, Uint8 _g, Uint8 _b, Uint8 _a, + bool draw_end) +{ + const SDL_PixelFormatDetails *fmt = dst->fmt; + unsigned r, g, b, a, inva; + + if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) { + r = DRAW_MUL(_r, _a); + g = DRAW_MUL(_g, _a); + b = DRAW_MUL(_b, _a); + a = _a; + } else { + r = _r; + g = _g; + b = _b; + a = _a; + } + inva = (a ^ 0xff); + + if (y1 == y2) { + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + HLINE(Uint16, DRAW_SETPIXEL_BLEND_RGB, draw_end); + break; + case SDL_BLENDMODE_BLEND_PREMULTIPLIED: + HLINE(Uint16, DRAW_SETPIXEL_BLEND_CLAMPED_RGB, draw_end); + break; + case SDL_BLENDMODE_ADD: + case SDL_BLENDMODE_ADD_PREMULTIPLIED: + HLINE(Uint16, DRAW_SETPIXEL_ADD_RGB, draw_end); + break; + case SDL_BLENDMODE_MOD: + HLINE(Uint16, DRAW_SETPIXEL_MOD_RGB, draw_end); + break; + case SDL_BLENDMODE_MUL: + HLINE(Uint16, DRAW_SETPIXEL_MUL_RGB, draw_end); + break; + default: + HLINE(Uint16, DRAW_SETPIXEL_RGB, draw_end); + break; + } + } else if (x1 == x2) { + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + VLINE(Uint16, DRAW_SETPIXEL_BLEND_RGB, draw_end); + break; + case SDL_BLENDMODE_BLEND_PREMULTIPLIED: + VLINE(Uint16, DRAW_SETPIXEL_BLEND_CLAMPED_RGB, draw_end); + break; + case SDL_BLENDMODE_ADD: + case SDL_BLENDMODE_ADD_PREMULTIPLIED: + VLINE(Uint16, DRAW_SETPIXEL_ADD_RGB, draw_end); + break; + case SDL_BLENDMODE_MOD: + VLINE(Uint16, DRAW_SETPIXEL_MOD_RGB, draw_end); + break; + case SDL_BLENDMODE_MUL: + VLINE(Uint16, DRAW_SETPIXEL_MUL_RGB, draw_end); + break; + default: + VLINE(Uint16, DRAW_SETPIXEL_RGB, draw_end); + break; + } + } else if (ABS(x1 - x2) == ABS(y1 - y2)) { + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + DLINE(Uint16, DRAW_SETPIXEL_BLEND_RGB, draw_end); + break; + case SDL_BLENDMODE_BLEND_PREMULTIPLIED: + DLINE(Uint16, DRAW_SETPIXEL_BLEND_CLAMPED_RGB, draw_end); + break; + case SDL_BLENDMODE_ADD: + case SDL_BLENDMODE_ADD_PREMULTIPLIED: + DLINE(Uint16, DRAW_SETPIXEL_ADD_RGB, draw_end); + break; + case SDL_BLENDMODE_MOD: + DLINE(Uint16, DRAW_SETPIXEL_MOD_RGB, draw_end); + break; + case SDL_BLENDMODE_MUL: + DLINE(Uint16, DRAW_SETPIXEL_MUL_RGB, draw_end); + break; + default: + DLINE(Uint16, DRAW_SETPIXEL_RGB, draw_end); + break; + } + } else { + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY2_BLEND_RGB, DRAW_SETPIXELXY2_BLEND_RGB, + draw_end); + break; + case SDL_BLENDMODE_BLEND_PREMULTIPLIED: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY2_BLEND_CLAMPED_RGB, DRAW_SETPIXELXY2_BLEND_CLAMPED_RGB, + draw_end); + break; + case SDL_BLENDMODE_ADD: + case SDL_BLENDMODE_ADD_PREMULTIPLIED: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY2_ADD_RGB, DRAW_SETPIXELXY2_ADD_RGB, + draw_end); + break; + case SDL_BLENDMODE_MOD: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY2_MOD_RGB, DRAW_SETPIXELXY2_MOD_RGB, + draw_end); + break; + case SDL_BLENDMODE_MUL: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY2_MUL_RGB, DRAW_SETPIXELXY2_MUL_RGB, + draw_end); + break; + default: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY2_RGB, DRAW_SETPIXELXY2_BLEND_RGB, + draw_end); + break; + } + } +} + +static void SDL_BlendLine_RGB555(SDL_Surface *dst, int x1, int y1, int x2, int y2, + SDL_BlendMode blendMode, Uint8 _r, Uint8 _g, Uint8 _b, Uint8 _a, + bool draw_end) +{ + unsigned r, g, b, a, inva; + + if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) { + r = DRAW_MUL(_r, _a); + g = DRAW_MUL(_g, _a); + b = DRAW_MUL(_b, _a); + a = _a; + } else { + r = _r; + g = _g; + b = _b; + a = _a; + } + inva = (a ^ 0xff); + + if (y1 == y2) { + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + HLINE(Uint16, DRAW_SETPIXEL_BLEND_RGB555, draw_end); + break; + case SDL_BLENDMODE_BLEND_PREMULTIPLIED: + HLINE(Uint16, DRAW_SETPIXEL_BLEND_CLAMPED_RGB555, draw_end); + break; + case SDL_BLENDMODE_ADD: + case SDL_BLENDMODE_ADD_PREMULTIPLIED: + HLINE(Uint16, DRAW_SETPIXEL_ADD_RGB555, draw_end); + break; + case SDL_BLENDMODE_MOD: + HLINE(Uint16, DRAW_SETPIXEL_MOD_RGB555, draw_end); + break; + case SDL_BLENDMODE_MUL: + HLINE(Uint16, DRAW_SETPIXEL_MUL_RGB555, draw_end); + break; + default: + HLINE(Uint16, DRAW_SETPIXEL_RGB555, draw_end); + break; + } + } else if (x1 == x2) { + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + VLINE(Uint16, DRAW_SETPIXEL_BLEND_RGB555, draw_end); + break; + case SDL_BLENDMODE_BLEND_PREMULTIPLIED: + VLINE(Uint16, DRAW_SETPIXEL_BLEND_CLAMPED_RGB555, draw_end); + break; + case SDL_BLENDMODE_ADD: + case SDL_BLENDMODE_ADD_PREMULTIPLIED: + VLINE(Uint16, DRAW_SETPIXEL_ADD_RGB555, draw_end); + break; + case SDL_BLENDMODE_MOD: + VLINE(Uint16, DRAW_SETPIXEL_MOD_RGB555, draw_end); + break; + case SDL_BLENDMODE_MUL: + VLINE(Uint16, DRAW_SETPIXEL_MUL_RGB555, draw_end); + break; + default: + VLINE(Uint16, DRAW_SETPIXEL_RGB555, draw_end); + break; + } + } else if (ABS(x1 - x2) == ABS(y1 - y2)) { + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + DLINE(Uint16, DRAW_SETPIXEL_BLEND_RGB555, draw_end); + break; + case SDL_BLENDMODE_BLEND_PREMULTIPLIED: + DLINE(Uint16, DRAW_SETPIXEL_BLEND_CLAMPED_RGB555, draw_end); + break; + case SDL_BLENDMODE_ADD: + case SDL_BLENDMODE_ADD_PREMULTIPLIED: + DLINE(Uint16, DRAW_SETPIXEL_ADD_RGB555, draw_end); + break; + case SDL_BLENDMODE_MOD: + DLINE(Uint16, DRAW_SETPIXEL_MOD_RGB555, draw_end); + break; + case SDL_BLENDMODE_MUL: + DLINE(Uint16, DRAW_SETPIXEL_MUL_RGB555, draw_end); + break; + default: + DLINE(Uint16, DRAW_SETPIXEL_RGB555, draw_end); + break; + } + } else { + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY_BLEND_RGB555, DRAW_SETPIXELXY_BLEND_RGB555, + draw_end); + break; + case SDL_BLENDMODE_BLEND_PREMULTIPLIED: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY_BLEND_CLAMPED_RGB555, DRAW_SETPIXELXY_BLEND_CLAMPED_RGB555, + draw_end); + break; + case SDL_BLENDMODE_ADD: + case SDL_BLENDMODE_ADD_PREMULTIPLIED: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY_ADD_RGB555, DRAW_SETPIXELXY_ADD_RGB555, + draw_end); + break; + case SDL_BLENDMODE_MOD: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY_MOD_RGB555, DRAW_SETPIXELXY_MOD_RGB555, + draw_end); + break; + case SDL_BLENDMODE_MUL: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY_MUL_RGB555, DRAW_SETPIXELXY_MUL_RGB555, + draw_end); + break; + default: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY_RGB555, DRAW_SETPIXELXY_BLEND_RGB555, + draw_end); + break; + } + } +} + +static void SDL_BlendLine_RGB565(SDL_Surface *dst, int x1, int y1, int x2, int y2, + SDL_BlendMode blendMode, Uint8 _r, Uint8 _g, Uint8 _b, Uint8 _a, + bool draw_end) +{ + unsigned r, g, b, a, inva; + + if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) { + r = DRAW_MUL(_r, _a); + g = DRAW_MUL(_g, _a); + b = DRAW_MUL(_b, _a); + a = _a; + } else { + r = _r; + g = _g; + b = _b; + a = _a; + } + inva = (a ^ 0xff); + + if (y1 == y2) { + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + HLINE(Uint16, DRAW_SETPIXEL_BLEND_RGB565, draw_end); + break; + case SDL_BLENDMODE_BLEND_PREMULTIPLIED: + HLINE(Uint16, DRAW_SETPIXEL_BLEND_CLAMPED_RGB565, draw_end); + break; + case SDL_BLENDMODE_ADD: + case SDL_BLENDMODE_ADD_PREMULTIPLIED: + HLINE(Uint16, DRAW_SETPIXEL_ADD_RGB565, draw_end); + break; + case SDL_BLENDMODE_MOD: + HLINE(Uint16, DRAW_SETPIXEL_MOD_RGB565, draw_end); + break; + case SDL_BLENDMODE_MUL: + HLINE(Uint16, DRAW_SETPIXEL_MUL_RGB565, draw_end); + break; + default: + HLINE(Uint16, DRAW_SETPIXEL_RGB565, draw_end); + break; + } + } else if (x1 == x2) { + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + VLINE(Uint16, DRAW_SETPIXEL_BLEND_RGB565, draw_end); + break; + case SDL_BLENDMODE_BLEND_PREMULTIPLIED: + VLINE(Uint16, DRAW_SETPIXEL_BLEND_CLAMPED_RGB565, draw_end); + break; + case SDL_BLENDMODE_ADD: + case SDL_BLENDMODE_ADD_PREMULTIPLIED: + VLINE(Uint16, DRAW_SETPIXEL_ADD_RGB565, draw_end); + break; + case SDL_BLENDMODE_MOD: + VLINE(Uint16, DRAW_SETPIXEL_MOD_RGB565, draw_end); + break; + case SDL_BLENDMODE_MUL: + VLINE(Uint16, DRAW_SETPIXEL_MUL_RGB565, draw_end); + break; + default: + VLINE(Uint16, DRAW_SETPIXEL_RGB565, draw_end); + break; + } + } else if (ABS(x1 - x2) == ABS(y1 - y2)) { + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + DLINE(Uint16, DRAW_SETPIXEL_BLEND_RGB565, draw_end); + break; + case SDL_BLENDMODE_BLEND_PREMULTIPLIED: + DLINE(Uint16, DRAW_SETPIXEL_BLEND_CLAMPED_RGB565, draw_end); + break; + case SDL_BLENDMODE_ADD: + case SDL_BLENDMODE_ADD_PREMULTIPLIED: + DLINE(Uint16, DRAW_SETPIXEL_ADD_RGB565, draw_end); + break; + case SDL_BLENDMODE_MOD: + DLINE(Uint16, DRAW_SETPIXEL_MOD_RGB565, draw_end); + break; + case SDL_BLENDMODE_MUL: + DLINE(Uint16, DRAW_SETPIXEL_MUL_RGB565, draw_end); + break; + default: + DLINE(Uint16, DRAW_SETPIXEL_RGB565, draw_end); + break; + } + } else { + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY_BLEND_RGB565, DRAW_SETPIXELXY_BLEND_RGB565, + draw_end); + break; + case SDL_BLENDMODE_BLEND_PREMULTIPLIED: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY_BLEND_CLAMPED_RGB565, DRAW_SETPIXELXY_BLEND_CLAMPED_RGB565, + draw_end); + break; + case SDL_BLENDMODE_ADD: + case SDL_BLENDMODE_ADD_PREMULTIPLIED: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY_ADD_RGB565, DRAW_SETPIXELXY_ADD_RGB565, + draw_end); + break; + case SDL_BLENDMODE_MOD: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY_MOD_RGB565, DRAW_SETPIXELXY_MOD_RGB565, + draw_end); + break; + case SDL_BLENDMODE_MUL: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY_MUL_RGB565, DRAW_SETPIXELXY_MUL_RGB565, + draw_end); + break; + default: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY_RGB565, DRAW_SETPIXELXY_BLEND_RGB565, + draw_end); + break; + } + } +} + +static void SDL_BlendLine_RGB4(SDL_Surface *dst, int x1, int y1, int x2, int y2, + SDL_BlendMode blendMode, Uint8 _r, Uint8 _g, Uint8 _b, Uint8 _a, + bool draw_end) +{ + const SDL_PixelFormatDetails *fmt = dst->fmt; + unsigned r, g, b, a, inva; + + if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) { + r = DRAW_MUL(_r, _a); + g = DRAW_MUL(_g, _a); + b = DRAW_MUL(_b, _a); + a = _a; + } else { + r = _r; + g = _g; + b = _b; + a = _a; + } + inva = (a ^ 0xff); + + if (y1 == y2) { + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + HLINE(Uint32, DRAW_SETPIXEL_BLEND_RGB, draw_end); + break; + case SDL_BLENDMODE_BLEND_PREMULTIPLIED: + HLINE(Uint32, DRAW_SETPIXEL_BLEND_CLAMPED_RGB, draw_end); + break; + case SDL_BLENDMODE_ADD: + case SDL_BLENDMODE_ADD_PREMULTIPLIED: + HLINE(Uint32, DRAW_SETPIXEL_ADD_RGB, draw_end); + break; + case SDL_BLENDMODE_MOD: + HLINE(Uint32, DRAW_SETPIXEL_MOD_RGB, draw_end); + break; + case SDL_BLENDMODE_MUL: + HLINE(Uint32, DRAW_SETPIXEL_MUL_RGB, draw_end); + break; + default: + HLINE(Uint32, DRAW_SETPIXEL_RGB, draw_end); + break; + } + } else if (x1 == x2) { + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + VLINE(Uint32, DRAW_SETPIXEL_BLEND_RGB, draw_end); + break; + case SDL_BLENDMODE_BLEND_PREMULTIPLIED: + VLINE(Uint32, DRAW_SETPIXEL_BLEND_CLAMPED_RGB, draw_end); + break; + case SDL_BLENDMODE_ADD: + case SDL_BLENDMODE_ADD_PREMULTIPLIED: + VLINE(Uint32, DRAW_SETPIXEL_ADD_RGB, draw_end); + break; + case SDL_BLENDMODE_MOD: + VLINE(Uint32, DRAW_SETPIXEL_MOD_RGB, draw_end); + break; + case SDL_BLENDMODE_MUL: + VLINE(Uint32, DRAW_SETPIXEL_MUL_RGB, draw_end); + break; + default: + VLINE(Uint32, DRAW_SETPIXEL_RGB, draw_end); + break; + } + } else if (ABS(x1 - x2) == ABS(y1 - y2)) { + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + DLINE(Uint32, DRAW_SETPIXEL_BLEND_RGB, draw_end); + break; + case SDL_BLENDMODE_BLEND_PREMULTIPLIED: + DLINE(Uint32, DRAW_SETPIXEL_BLEND_CLAMPED_RGB, draw_end); + break; + case SDL_BLENDMODE_ADD: + case SDL_BLENDMODE_ADD_PREMULTIPLIED: + DLINE(Uint32, DRAW_SETPIXEL_ADD_RGB, draw_end); + break; + case SDL_BLENDMODE_MOD: + DLINE(Uint32, DRAW_SETPIXEL_MOD_RGB, draw_end); + break; + case SDL_BLENDMODE_MUL: + DLINE(Uint32, DRAW_SETPIXEL_MUL_RGB, draw_end); + break; + default: + DLINE(Uint32, DRAW_SETPIXEL_RGB, draw_end); + break; + } + } else { + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY4_BLEND_RGB, DRAW_SETPIXELXY4_BLEND_RGB, + draw_end); + break; + case SDL_BLENDMODE_BLEND_PREMULTIPLIED: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY4_BLEND_CLAMPED_RGB, DRAW_SETPIXELXY4_BLEND_CLAMPED_RGB, + draw_end); + break; + case SDL_BLENDMODE_ADD: + case SDL_BLENDMODE_ADD_PREMULTIPLIED: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY4_ADD_RGB, DRAW_SETPIXELXY4_ADD_RGB, + draw_end); + break; + case SDL_BLENDMODE_MOD: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY4_MOD_RGB, DRAW_SETPIXELXY4_MOD_RGB, + draw_end); + break; + case SDL_BLENDMODE_MUL: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY4_MUL_RGB, DRAW_SETPIXELXY4_MUL_RGB, + draw_end); + break; + default: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY4_RGB, DRAW_SETPIXELXY4_BLEND_RGB, + draw_end); + break; + } + } +} + +static void SDL_BlendLine_RGBA4(SDL_Surface *dst, int x1, int y1, int x2, int y2, + SDL_BlendMode blendMode, Uint8 _r, Uint8 _g, Uint8 _b, Uint8 _a, + bool draw_end) +{ + const SDL_PixelFormatDetails *fmt = dst->fmt; + unsigned r, g, b, a, inva; + + if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) { + r = DRAW_MUL(_r, _a); + g = DRAW_MUL(_g, _a); + b = DRAW_MUL(_b, _a); + a = _a; + } else { + r = _r; + g = _g; + b = _b; + a = _a; + } + inva = (a ^ 0xff); + + if (y1 == y2) { + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + HLINE(Uint32, DRAW_SETPIXEL_BLEND_RGBA, draw_end); + break; + case SDL_BLENDMODE_BLEND_PREMULTIPLIED: + HLINE(Uint32, DRAW_SETPIXEL_BLEND_CLAMPED_RGBA, draw_end); + break; + case SDL_BLENDMODE_ADD: + case SDL_BLENDMODE_ADD_PREMULTIPLIED: + HLINE(Uint32, DRAW_SETPIXEL_ADD_RGBA, draw_end); + break; + case SDL_BLENDMODE_MOD: + HLINE(Uint32, DRAW_SETPIXEL_MOD_RGBA, draw_end); + break; + case SDL_BLENDMODE_MUL: + HLINE(Uint32, DRAW_SETPIXEL_MUL_RGBA, draw_end); + break; + default: + HLINE(Uint32, DRAW_SETPIXEL_RGBA, draw_end); + break; + } + } else if (x1 == x2) { + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + VLINE(Uint32, DRAW_SETPIXEL_BLEND_RGBA, draw_end); + break; + case SDL_BLENDMODE_BLEND_PREMULTIPLIED: + VLINE(Uint32, DRAW_SETPIXEL_BLEND_CLAMPED_RGBA, draw_end); + break; + case SDL_BLENDMODE_ADD: + case SDL_BLENDMODE_ADD_PREMULTIPLIED: + VLINE(Uint32, DRAW_SETPIXEL_ADD_RGBA, draw_end); + break; + case SDL_BLENDMODE_MOD: + VLINE(Uint32, DRAW_SETPIXEL_MOD_RGBA, draw_end); + break; + case SDL_BLENDMODE_MUL: + VLINE(Uint32, DRAW_SETPIXEL_MUL_RGBA, draw_end); + break; + default: + VLINE(Uint32, DRAW_SETPIXEL_RGBA, draw_end); + break; + } + } else if (ABS(x1 - x2) == ABS(y1 - y2)) { + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + DLINE(Uint32, DRAW_SETPIXEL_BLEND_RGBA, draw_end); + break; + case SDL_BLENDMODE_BLEND_PREMULTIPLIED: + DLINE(Uint32, DRAW_SETPIXEL_BLEND_CLAMPED_RGBA, draw_end); + break; + case SDL_BLENDMODE_ADD: + case SDL_BLENDMODE_ADD_PREMULTIPLIED: + DLINE(Uint32, DRAW_SETPIXEL_ADD_RGBA, draw_end); + break; + case SDL_BLENDMODE_MOD: + DLINE(Uint32, DRAW_SETPIXEL_MOD_RGBA, draw_end); + break; + case SDL_BLENDMODE_MUL: + DLINE(Uint32, DRAW_SETPIXEL_MUL_RGBA, draw_end); + break; + default: + DLINE(Uint32, DRAW_SETPIXEL_RGBA, draw_end); + break; + } + } else { + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY4_BLEND_RGBA, DRAW_SETPIXELXY4_BLEND_RGBA, + draw_end); + break; + case SDL_BLENDMODE_BLEND_PREMULTIPLIED: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY4_BLEND_CLAMPED_RGBA, DRAW_SETPIXELXY4_BLEND_CLAMPED_RGBA, + draw_end); + break; + case SDL_BLENDMODE_ADD: + case SDL_BLENDMODE_ADD_PREMULTIPLIED: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY4_ADD_RGBA, DRAW_SETPIXELXY4_ADD_RGBA, + draw_end); + break; + case SDL_BLENDMODE_MOD: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY4_MOD_RGBA, DRAW_SETPIXELXY4_MOD_RGBA, + draw_end); + break; + case SDL_BLENDMODE_MUL: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY4_MUL_RGBA, DRAW_SETPIXELXY4_MUL_RGBA, + draw_end); + break; + default: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY4_RGBA, DRAW_SETPIXELXY4_BLEND_RGBA, + draw_end); + break; + } + } +} + +static void SDL_BlendLine_XRGB8888(SDL_Surface *dst, int x1, int y1, int x2, int y2, + SDL_BlendMode blendMode, Uint8 _r, Uint8 _g, Uint8 _b, Uint8 _a, + bool draw_end) +{ + unsigned r, g, b, a, inva; + + if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) { + r = DRAW_MUL(_r, _a); + g = DRAW_MUL(_g, _a); + b = DRAW_MUL(_b, _a); + a = _a; + } else { + r = _r; + g = _g; + b = _b; + a = _a; + } + inva = (a ^ 0xff); + + if (y1 == y2) { + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + HLINE(Uint32, DRAW_SETPIXEL_BLEND_XRGB8888, draw_end); + break; + case SDL_BLENDMODE_BLEND_PREMULTIPLIED: + HLINE(Uint32, DRAW_SETPIXEL_BLEND_CLAMPED_XRGB8888, draw_end); + break; + case SDL_BLENDMODE_ADD: + case SDL_BLENDMODE_ADD_PREMULTIPLIED: + HLINE(Uint32, DRAW_SETPIXEL_ADD_XRGB8888, draw_end); + break; + case SDL_BLENDMODE_MOD: + HLINE(Uint32, DRAW_SETPIXEL_MOD_XRGB8888, draw_end); + break; + case SDL_BLENDMODE_MUL: + HLINE(Uint32, DRAW_SETPIXEL_MUL_XRGB8888, draw_end); + break; + default: + HLINE(Uint32, DRAW_SETPIXEL_XRGB8888, draw_end); + break; + } + } else if (x1 == x2) { + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + VLINE(Uint32, DRAW_SETPIXEL_BLEND_XRGB8888, draw_end); + break; + case SDL_BLENDMODE_BLEND_PREMULTIPLIED: + VLINE(Uint32, DRAW_SETPIXEL_BLEND_CLAMPED_XRGB8888, draw_end); + break; + case SDL_BLENDMODE_ADD: + case SDL_BLENDMODE_ADD_PREMULTIPLIED: + VLINE(Uint32, DRAW_SETPIXEL_ADD_XRGB8888, draw_end); + break; + case SDL_BLENDMODE_MOD: + VLINE(Uint32, DRAW_SETPIXEL_MOD_XRGB8888, draw_end); + break; + case SDL_BLENDMODE_MUL: + VLINE(Uint32, DRAW_SETPIXEL_MUL_XRGB8888, draw_end); + break; + default: + VLINE(Uint32, DRAW_SETPIXEL_XRGB8888, draw_end); + break; + } + } else if (ABS(x1 - x2) == ABS(y1 - y2)) { + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + DLINE(Uint32, DRAW_SETPIXEL_BLEND_XRGB8888, draw_end); + break; + case SDL_BLENDMODE_BLEND_PREMULTIPLIED: + DLINE(Uint32, DRAW_SETPIXEL_BLEND_CLAMPED_XRGB8888, draw_end); + break; + case SDL_BLENDMODE_ADD: + case SDL_BLENDMODE_ADD_PREMULTIPLIED: + DLINE(Uint32, DRAW_SETPIXEL_ADD_XRGB8888, draw_end); + break; + case SDL_BLENDMODE_MOD: + DLINE(Uint32, DRAW_SETPIXEL_MOD_XRGB8888, draw_end); + break; + case SDL_BLENDMODE_MUL: + DLINE(Uint32, DRAW_SETPIXEL_MUL_XRGB8888, draw_end); + break; + default: + DLINE(Uint32, DRAW_SETPIXEL_XRGB8888, draw_end); + break; + } + } else { + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY_BLEND_XRGB8888, DRAW_SETPIXELXY_BLEND_XRGB8888, + draw_end); + break; + case SDL_BLENDMODE_BLEND_PREMULTIPLIED: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY_BLEND_CLAMPED_XRGB8888, DRAW_SETPIXELXY_BLEND_CLAMPED_XRGB8888, + draw_end); + break; + case SDL_BLENDMODE_ADD: + case SDL_BLENDMODE_ADD_PREMULTIPLIED: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY_ADD_XRGB8888, DRAW_SETPIXELXY_ADD_XRGB8888, + draw_end); + break; + case SDL_BLENDMODE_MOD: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY_MOD_XRGB8888, DRAW_SETPIXELXY_MOD_XRGB8888, + draw_end); + break; + case SDL_BLENDMODE_MUL: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY_MUL_XRGB8888, DRAW_SETPIXELXY_MUL_XRGB8888, + draw_end); + break; + default: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY_XRGB8888, DRAW_SETPIXELXY_BLEND_XRGB8888, + draw_end); + break; + } + } +} + +static void SDL_BlendLine_ARGB8888(SDL_Surface *dst, int x1, int y1, int x2, int y2, + SDL_BlendMode blendMode, Uint8 _r, Uint8 _g, Uint8 _b, Uint8 _a, + bool draw_end) +{ + unsigned r, g, b, a, inva; + + if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) { + r = DRAW_MUL(_r, _a); + g = DRAW_MUL(_g, _a); + b = DRAW_MUL(_b, _a); + a = _a; + } else { + r = _r; + g = _g; + b = _b; + a = _a; + } + inva = (a ^ 0xff); + + if (y1 == y2) { + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + HLINE(Uint32, DRAW_SETPIXEL_BLEND_ARGB8888, draw_end); + break; + case SDL_BLENDMODE_BLEND_PREMULTIPLIED: + HLINE(Uint32, DRAW_SETPIXEL_BLEND_CLAMPED_ARGB8888, draw_end); + break; + case SDL_BLENDMODE_ADD: + case SDL_BLENDMODE_ADD_PREMULTIPLIED: + HLINE(Uint32, DRAW_SETPIXEL_ADD_ARGB8888, draw_end); + break; + case SDL_BLENDMODE_MOD: + HLINE(Uint32, DRAW_SETPIXEL_MOD_ARGB8888, draw_end); + break; + case SDL_BLENDMODE_MUL: + HLINE(Uint32, DRAW_SETPIXEL_MUL_ARGB8888, draw_end); + break; + default: + HLINE(Uint32, DRAW_SETPIXEL_ARGB8888, draw_end); + break; + } + } else if (x1 == x2) { + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + VLINE(Uint32, DRAW_SETPIXEL_BLEND_ARGB8888, draw_end); + break; + case SDL_BLENDMODE_BLEND_PREMULTIPLIED: + VLINE(Uint32, DRAW_SETPIXEL_BLEND_CLAMPED_ARGB8888, draw_end); + break; + case SDL_BLENDMODE_ADD: + case SDL_BLENDMODE_ADD_PREMULTIPLIED: + VLINE(Uint32, DRAW_SETPIXEL_ADD_ARGB8888, draw_end); + break; + case SDL_BLENDMODE_MOD: + VLINE(Uint32, DRAW_SETPIXEL_MOD_ARGB8888, draw_end); + break; + case SDL_BLENDMODE_MUL: + VLINE(Uint32, DRAW_SETPIXEL_MUL_ARGB8888, draw_end); + break; + default: + VLINE(Uint32, DRAW_SETPIXEL_ARGB8888, draw_end); + break; + } + } else if (ABS(x1 - x2) == ABS(y1 - y2)) { + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + DLINE(Uint32, DRAW_SETPIXEL_BLEND_ARGB8888, draw_end); + break; + case SDL_BLENDMODE_BLEND_PREMULTIPLIED: + DLINE(Uint32, DRAW_SETPIXEL_BLEND_CLAMPED_ARGB8888, draw_end); + break; + case SDL_BLENDMODE_ADD: + case SDL_BLENDMODE_ADD_PREMULTIPLIED: + DLINE(Uint32, DRAW_SETPIXEL_ADD_ARGB8888, draw_end); + break; + case SDL_BLENDMODE_MOD: + DLINE(Uint32, DRAW_SETPIXEL_MOD_ARGB8888, draw_end); + break; + case SDL_BLENDMODE_MUL: + DLINE(Uint32, DRAW_SETPIXEL_MUL_ARGB8888, draw_end); + break; + default: + DLINE(Uint32, DRAW_SETPIXEL_ARGB8888, draw_end); + break; + } + } else { + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY_BLEND_ARGB8888, DRAW_SETPIXELXY_BLEND_ARGB8888, + draw_end); + break; + case SDL_BLENDMODE_BLEND_PREMULTIPLIED: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY_BLEND_CLAMPED_ARGB8888, DRAW_SETPIXELXY_BLEND_CLAMPED_ARGB8888, + draw_end); + break; + case SDL_BLENDMODE_ADD: + case SDL_BLENDMODE_ADD_PREMULTIPLIED: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY_ADD_ARGB8888, DRAW_SETPIXELXY_ADD_ARGB8888, + draw_end); + break; + case SDL_BLENDMODE_MOD: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY_MOD_ARGB8888, DRAW_SETPIXELXY_MOD_ARGB8888, + draw_end); + break; + case SDL_BLENDMODE_MUL: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY_MUL_ARGB8888, DRAW_SETPIXELXY_MUL_ARGB8888, + draw_end); + break; + default: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY_ARGB8888, DRAW_SETPIXELXY_BLEND_ARGB8888, + draw_end); + break; + } + } +} + +typedef void (*BlendLineFunc)(SDL_Surface *dst, + int x1, int y1, int x2, int y2, + SDL_BlendMode blendMode, + Uint8 r, Uint8 g, Uint8 b, Uint8 a, + bool draw_end); + +static BlendLineFunc SDL_CalculateBlendLineFunc(const SDL_PixelFormatDetails *fmt) +{ + switch (fmt->bytes_per_pixel) { + case 2: + if (fmt->Rmask == 0x7C00) { + return SDL_BlendLine_RGB555; + } else if (fmt->Rmask == 0xF800) { + return SDL_BlendLine_RGB565; + } else { + return SDL_BlendLine_RGB2; + } + // break; -Wunreachable-code-break + case 4: + if (fmt->Rmask == 0x00FF0000) { + if (fmt->Amask) { + return SDL_BlendLine_ARGB8888; + } else { + return SDL_BlendLine_XRGB8888; + } + } else { + if (fmt->Amask) { + return SDL_BlendLine_RGBA4; + } else { + return SDL_BlendLine_RGB4; + } + } + } + return NULL; +} + +bool SDL_BlendLine(SDL_Surface *dst, int x1, int y1, int x2, int y2, SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) +{ + BlendLineFunc func; + + if (!SDL_SurfaceValid(dst)) { + return SDL_InvalidParamError("SDL_BlendLine(): dst"); + } + + func = SDL_CalculateBlendLineFunc(dst->fmt); + if (!func) { + return SDL_SetError("SDL_BlendLine(): Unsupported surface format"); + } + + // Perform clipping + // FIXME: We don't actually want to clip, as it may change line slope + if (!SDL_GetRectAndLineIntersection(&dst->clip_rect, &x1, &y1, &x2, &y2)) { + return true; + } + + func(dst, x1, y1, x2, y2, blendMode, r, g, b, a, true); + return true; +} + +bool SDL_BlendLines(SDL_Surface *dst, const SDL_Point *points, int count, SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) +{ + int i; + int x1, y1; + int x2, y2; + bool draw_end; + BlendLineFunc func; + + if (!SDL_SurfaceValid(dst)) { + return SDL_SetError("SDL_BlendLines(): Passed NULL destination surface"); + } + + func = SDL_CalculateBlendLineFunc(dst->fmt); + if (!func) { + return SDL_SetError("SDL_BlendLines(): Unsupported surface format"); + } + + for (i = 1; i < count; ++i) { + x1 = points[i - 1].x; + y1 = points[i - 1].y; + x2 = points[i].x; + y2 = points[i].y; + + // Perform clipping + // FIXME: We don't actually want to clip, as it may change line slope + if (!SDL_GetRectAndLineIntersection(&dst->clip_rect, &x1, &y1, &x2, &y2)) { + continue; + } + + // Draw the end if it was clipped + draw_end = (x2 != points[i].x || y2 != points[i].y); + + func(dst, x1, y1, x2, y2, blendMode, r, g, b, a, draw_end); + } + if (points[0].x != points[count - 1].x || points[0].y != points[count - 1].y) { + SDL_BlendPoint(dst, points[count - 1].x, points[count - 1].y, + blendMode, r, g, b, a); + } + return true; +} + +#endif // SDL_VIDEO_RENDER_SW -- cgit v1.2.3