/* 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" #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, 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; case SDL_BLENDMODE_MOD: HLINE(Uint16, DRAW_SETPIXEL_MOD_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; case SDL_BLENDMODE_MOD: VLINE(Uint16, DRAW_SETPIXEL_MOD_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; case SDL_BLENDMODE_MOD: DLINE(Uint16, DRAW_SETPIXEL_MOD_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; case SDL_BLENDMODE_MOD: AALINE(x1, y1, x2, y2, DRAW_SETPIXELXY2_MOD_RGB, DRAW_SETPIXELXY2_MOD_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; case SDL_BLENDMODE_MOD: HLINE(Uint16, DRAW_SETPIXEL_MOD_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; case SDL_BLENDMODE_MOD: VLINE(Uint16, DRAW_SETPIXEL_MOD_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; case SDL_BLENDMODE_MOD: DLINE(Uint16, DRAW_SETPIXEL_MOD_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; case SDL_BLENDMODE_MOD: AALINE(x1, y1, x2, y2, DRAW_SETPIXELXY_MOD_RGB555, DRAW_SETPIXELXY_MOD_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; case SDL_BLENDMODE_MOD: HLINE(Uint16, DRAW_SETPIXEL_MOD_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; case SDL_BLENDMODE_MOD: VLINE(Uint16, DRAW_SETPIXEL_MOD_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; case SDL_BLENDMODE_MOD: DLINE(Uint16, DRAW_SETPIXEL_MOD_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; case SDL_BLENDMODE_MOD: AALINE(x1, y1, x2, y2, DRAW_SETPIXELXY_MOD_RGB565, DRAW_SETPIXELXY_MOD_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; case SDL_BLENDMODE_MOD: HLINE(Uint32, DRAW_SETPIXEL_MOD_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; case SDL_BLENDMODE_MOD: VLINE(Uint32, DRAW_SETPIXEL_MOD_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; case SDL_BLENDMODE_MOD: DLINE(Uint32, DRAW_SETPIXEL_MOD_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; case SDL_BLENDMODE_MOD: AALINE(x1, y1, x2, y2, DRAW_SETPIXELXY4_MOD_RGB, DRAW_SETPIXELXY4_MOD_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; case SDL_BLENDMODE_MOD: HLINE(Uint32, DRAW_SETPIXEL_MOD_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; case SDL_BLENDMODE_MOD: VLINE(Uint32, DRAW_SETPIXEL_MOD_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; case SDL_BLENDMODE_MOD: DLINE(Uint32, DRAW_SETPIXEL_MOD_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; case SDL_BLENDMODE_MOD: AALINE(x1, y1, x2, y2, DRAW_SETPIXELXY4_MOD_RGBA, DRAW_SETPIXELXY4_MOD_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; case SDL_BLENDMODE_MOD: HLINE(Uint32, DRAW_SETPIXEL_MOD_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; case SDL_BLENDMODE_MOD: VLINE(Uint32, DRAW_SETPIXEL_MOD_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; case SDL_BLENDMODE_MOD: DLINE(Uint32, DRAW_SETPIXEL_MOD_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; case SDL_BLENDMODE_MOD: AALINE(x1, y1, x2, y2, DRAW_SETPIXELXY_MOD_RGB888, DRAW_SETPIXELXY_MOD_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; case SDL_BLENDMODE_MOD: HLINE(Uint32, DRAW_SETPIXEL_MOD_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; case SDL_BLENDMODE_MOD: VLINE(Uint32, DRAW_SETPIXEL_MOD_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; case SDL_BLENDMODE_MOD: DLINE(Uint32, DRAW_SETPIXEL_MOD_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; case SDL_BLENDMODE_MOD: AALINE(x1, y1, x2, y2, DRAW_SETPIXELXY_MOD_ARGB8888, DRAW_SETPIXELXY_MOD_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: */