Mercurial > sdl-ios-xcode
diff src/render/software/SDL_blendline.c @ 5166:d72793305335
Making the API simpler, moved the surface drawing functions to the software renderer.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Thu, 03 Feb 2011 02:45:29 -0800 |
| parents | src/video/SDL_blendline.c@e743b9c3f6d6 |
| children | 4d39eeaad00b |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/render/software/SDL_blendline.c Thu Feb 03 02:45:29 2011 -0800 @@ -0,0 +1,683 @@ +/* + SDL - Simple DirectMedia Layer + Copyright (C) 1997-2010 Sam Lantinga + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + This library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with this library; if not, write to the Free Software + Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + + Sam Lantinga + slouken@libsdl.org +*/ +#include "SDL_config.h" + +#include "SDL_draw.h" +#include "SDL_blendline.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, + SDL_bool draw_end) +{ + const SDL_PixelFormat *fmt = dst->format; + 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_ADD: + HLINE(Uint16, DRAW_SETPIXEL_ADD_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_ADD: + VLINE(Uint16, DRAW_SETPIXEL_ADD_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_ADD: + DLINE(Uint16, DRAW_SETPIXEL_ADD_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_ADD: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY2_ADD_RGB, DRAW_SETPIXELXY2_ADD_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, + SDL_bool draw_end) +{ + const SDL_PixelFormat *fmt = dst->format; + 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_ADD: + HLINE(Uint16, DRAW_SETPIXEL_ADD_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_ADD: + VLINE(Uint16, DRAW_SETPIXEL_ADD_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_ADD: + DLINE(Uint16, DRAW_SETPIXEL_ADD_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_ADD: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY_ADD_RGB555, DRAW_SETPIXELXY_ADD_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, + SDL_bool draw_end) +{ + const SDL_PixelFormat *fmt = dst->format; + 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_ADD: + HLINE(Uint16, DRAW_SETPIXEL_ADD_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_ADD: + VLINE(Uint16, DRAW_SETPIXEL_ADD_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_ADD: + DLINE(Uint16, DRAW_SETPIXEL_ADD_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_ADD: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY_ADD_RGB565, DRAW_SETPIXELXY_ADD_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, + SDL_bool draw_end) +{ + const SDL_PixelFormat *fmt = dst->format; + 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_ADD: + HLINE(Uint32, DRAW_SETPIXEL_ADD_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_ADD: + VLINE(Uint32, DRAW_SETPIXEL_ADD_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_ADD: + DLINE(Uint32, DRAW_SETPIXEL_ADD_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_ADD: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY4_ADD_RGB, DRAW_SETPIXELXY4_ADD_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, + SDL_bool draw_end) +{ + const SDL_PixelFormat *fmt = dst->format; + 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_ADD: + HLINE(Uint32, DRAW_SETPIXEL_ADD_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_ADD: + VLINE(Uint32, DRAW_SETPIXEL_ADD_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_ADD: + DLINE(Uint32, DRAW_SETPIXEL_ADD_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_ADD: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY4_ADD_RGBA, DRAW_SETPIXELXY4_ADD_RGBA, + draw_end); + break; + default: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY4_RGBA, DRAW_SETPIXELXY4_BLEND_RGBA, + draw_end); + break; + } + } +} + +static void +SDL_BlendLine_RGB888(SDL_Surface * dst, int x1, int y1, int x2, int y2, + SDL_BlendMode blendMode, Uint8 _r, Uint8 _g, Uint8 _b, Uint8 _a, + SDL_bool draw_end) +{ + const SDL_PixelFormat *fmt = dst->format; + 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_RGB888, draw_end); + break; + case SDL_BLENDMODE_ADD: + HLINE(Uint32, DRAW_SETPIXEL_ADD_RGB888, draw_end); + break; + default: + HLINE(Uint32, DRAW_SETPIXEL_RGB888, draw_end); + break; + } + } else if (x1 == x2) { + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + VLINE(Uint32, DRAW_SETPIXEL_BLEND_RGB888, draw_end); + break; + case SDL_BLENDMODE_ADD: + VLINE(Uint32, DRAW_SETPIXEL_ADD_RGB888, draw_end); + break; + default: + VLINE(Uint32, DRAW_SETPIXEL_RGB888, draw_end); + break; + } + } else if (ABS(x1 - x2) == ABS(y1 - y2)) { + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + DLINE(Uint32, DRAW_SETPIXEL_BLEND_RGB888, draw_end); + break; + case SDL_BLENDMODE_ADD: + DLINE(Uint32, DRAW_SETPIXEL_ADD_RGB888, draw_end); + break; + default: + DLINE(Uint32, DRAW_SETPIXEL_RGB888, draw_end); + break; + } + } else { + switch (blendMode) { + case SDL_BLENDMODE_BLEND: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY_BLEND_RGB888, DRAW_SETPIXELXY_BLEND_RGB888, + draw_end); + break; + case SDL_BLENDMODE_ADD: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY_ADD_RGB888, DRAW_SETPIXELXY_ADD_RGB888, + draw_end); + break; + default: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY_RGB888, DRAW_SETPIXELXY_BLEND_RGB888, + 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, + SDL_bool draw_end) +{ + const SDL_PixelFormat *fmt = dst->format; + 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_ADD: + HLINE(Uint32, DRAW_SETPIXEL_ADD_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_ADD: + VLINE(Uint32, DRAW_SETPIXEL_ADD_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_ADD: + DLINE(Uint32, DRAW_SETPIXEL_ADD_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_ADD: + AALINE(x1, y1, x2, y2, + DRAW_SETPIXELXY_ADD_ARGB8888, DRAW_SETPIXELXY_ADD_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, + SDL_bool draw_end); + +static BlendLineFunc +SDL_CalculateBlendLineFunc(const SDL_PixelFormat * fmt) +{ + switch (fmt->BytesPerPixel) { + 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; + case 4: + if (fmt->Rmask == 0x00FF0000) { + if (fmt->Amask) { + return SDL_BlendLine_ARGB8888; + } else { + return SDL_BlendLine_RGB888; + } + } else { + if (fmt->Amask) { + return SDL_BlendLine_RGBA4; + } else { + return SDL_BlendLine_RGB4; + } + } + } + return NULL; +} + +int +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 (!dst) { + SDL_SetError("SDL_BlendLine(): Passed NULL destination surface"); + return -1; + } + + func = SDL_CalculateBlendLineFunc(dst->format); + if (!func) { + SDL_SetError("SDL_BlendLine(): Unsupported surface format"); + return -1; + } + + /* Perform clipping */ + /* FIXME: We don't actually want to clip, as it may change line slope */ + if (!SDL_IntersectRectAndLine(&dst->clip_rect, &x1, &y1, &x2, &y2)) { + return 0; + } + + func(dst, x1, y1, x2, y2, blendMode, r, g, b, a, SDL_TRUE); + return 0; +} + +int +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; + SDL_bool draw_end; + BlendLineFunc func; + + if (!dst) { + SDL_SetError("SDL_BlendLines(): Passed NULL destination surface"); + return -1; + } + + func = SDL_CalculateBlendLineFunc(dst->format); + if (!func) { + SDL_SetError("SDL_BlendLines(): Unsupported surface format"); + return -1; + } + + 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_IntersectRectAndLine(&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 0; +} + +/* vi: set ts=4 sw=4 expandtab: */