diff options
Diffstat (limited to '3rdparty/SDL2/src/render/software/SDL_drawline.c')
-rw-r--r-- | 3rdparty/SDL2/src/render/software/SDL_drawline.c | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/3rdparty/SDL2/src/render/software/SDL_drawline.c b/3rdparty/SDL2/src/render/software/SDL_drawline.c new file mode 100644 index 00000000000..fd50ea748b0 --- /dev/null +++ b/3rdparty/SDL2/src/render/software/SDL_drawline.c @@ -0,0 +1,209 @@ +/* + Simple DirectMedia Layer + Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org> + + 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" + +#if !SDL_RENDER_DISABLED + +#include "SDL_draw.h" +#include "SDL_drawline.h" +#include "SDL_drawpoint.h" + + +static void +SDL_DrawLine1(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color, + SDL_bool draw_end) +{ + if (y1 == y2) { + int length; + int pitch = (dst->pitch / dst->format->BytesPerPixel); + Uint8 *pixel; + if (x1 <= x2) { + pixel = (Uint8 *)dst->pixels + y1 * pitch + x1; + length = draw_end ? (x2-x1+1) : (x2-x1); + } else { + pixel = (Uint8 *)dst->pixels + y1 * pitch + x2; + if (!draw_end) { + ++pixel; + } + length = draw_end ? (x1-x2+1) : (x1-x2); + } + SDL_memset(pixel, color, length); + } else if (x1 == x2) { + VLINE(Uint8, DRAW_FASTSETPIXEL1, draw_end); + } else if (ABS(x1 - x2) == ABS(y1 - y2)) { + DLINE(Uint8, DRAW_FASTSETPIXEL1, draw_end); + } else { + BLINE(x1, y1, x2, y2, DRAW_FASTSETPIXELXY1, draw_end); + } +} + +static void +SDL_DrawLine2(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color, + SDL_bool draw_end) +{ + if (y1 == y2) { + HLINE(Uint16, DRAW_FASTSETPIXEL2, draw_end); + } else if (x1 == x2) { + VLINE(Uint16, DRAW_FASTSETPIXEL2, draw_end); + } else if (ABS(x1 - x2) == ABS(y1 - y2)) { + DLINE(Uint16, DRAW_FASTSETPIXEL2, draw_end); + } else { + Uint8 _r, _g, _b, _a; + const SDL_PixelFormat * fmt = dst->format; + SDL_GetRGBA(color, fmt, &_r, &_g, &_b, &_a); + if (fmt->Rmask == 0x7C00) { + AALINE(x1, y1, x2, y2, + DRAW_FASTSETPIXELXY2, DRAW_SETPIXELXY_BLEND_RGB555, + draw_end); + } else if (fmt->Rmask == 0xF800) { + AALINE(x1, y1, x2, y2, + DRAW_FASTSETPIXELXY2, DRAW_SETPIXELXY_BLEND_RGB565, + draw_end); + } else { + AALINE(x1, y1, x2, y2, + DRAW_FASTSETPIXELXY2, DRAW_SETPIXELXY2_BLEND_RGB, + draw_end); + } + } +} + +static void +SDL_DrawLine4(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color, + SDL_bool draw_end) +{ + if (y1 == y2) { + HLINE(Uint32, DRAW_FASTSETPIXEL4, draw_end); + } else if (x1 == x2) { + VLINE(Uint32, DRAW_FASTSETPIXEL4, draw_end); + } else if (ABS(x1 - x2) == ABS(y1 - y2)) { + DLINE(Uint32, DRAW_FASTSETPIXEL4, draw_end); + } else { + Uint8 _r, _g, _b, _a; + const SDL_PixelFormat * fmt = dst->format; + SDL_GetRGBA(color, fmt, &_r, &_g, &_b, &_a); + if (fmt->Rmask == 0x00FF0000) { + if (!fmt->Amask) { + AALINE(x1, y1, x2, y2, + DRAW_FASTSETPIXELXY4, DRAW_SETPIXELXY_BLEND_RGB888, + draw_end); + } else { + AALINE(x1, y1, x2, y2, + DRAW_FASTSETPIXELXY4, DRAW_SETPIXELXY_BLEND_ARGB8888, + draw_end); + } + } else { + AALINE(x1, y1, x2, y2, + DRAW_FASTSETPIXELXY4, DRAW_SETPIXELXY4_BLEND_RGB, + draw_end); + } + } +} + +typedef void (*DrawLineFunc) (SDL_Surface * dst, + int x1, int y1, int x2, int y2, + Uint32 color, SDL_bool draw_end); + +static DrawLineFunc +SDL_CalculateDrawLineFunc(const SDL_PixelFormat * fmt) +{ + switch (fmt->BytesPerPixel) { + case 1: + if (fmt->BitsPerPixel < 8) { + break; + } + return SDL_DrawLine1; + case 2: + return SDL_DrawLine2; + case 4: + return SDL_DrawLine4; + } + return NULL; +} + +int +SDL_DrawLine(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color) +{ + DrawLineFunc func; + + if (!dst) { + return SDL_SetError("SDL_DrawLine(): Passed NULL destination surface"); + } + + func = SDL_CalculateDrawLineFunc(dst->format); + if (!func) { + return SDL_SetError("SDL_DrawLine(): Unsupported surface format"); + } + + /* 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, color, SDL_TRUE); + return 0; +} + +int +SDL_DrawLines(SDL_Surface * dst, const SDL_Point * points, int count, + Uint32 color) +{ + int i; + int x1, y1; + int x2, y2; + SDL_bool draw_end; + DrawLineFunc func; + + if (!dst) { + return SDL_SetError("SDL_DrawLines(): Passed NULL destination surface"); + } + + func = SDL_CalculateDrawLineFunc(dst->format); + if (!func) { + return SDL_SetError("SDL_DrawLines(): 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_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, color, draw_end); + } + if (points[0].x != points[count-1].x || points[0].y != points[count-1].y) { + SDL_DrawPoint(dst, points[count-1].x, points[count-1].y, color); + } + return 0; +} + +#endif /* !SDL_RENDER_DISABLED */ + +/* vi: set ts=4 sw=4 expandtab: */ |