This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
SDL_blendline.c
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Simple DirectMedia Layer
Copyright (C) 1997-2011 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.
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*/
#include "SDL_config.h"
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#if !SDL_RENDER_DISABLED
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#include "SDL_draw.h"
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#include "SDL_blendline.h"
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#include "SDL_blendpoint.h"
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static void
SDL_BlendLine_RGB2(SDL_Surface * dst, int x1, int y1, int x2, int y2,
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SDL_BlendMode blendMode, Uint8 _r, Uint8 _g, Uint8 _b, Uint8 _a,
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SDL_bool draw_end)
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const SDL_PixelFormat *fmt = dst->format;
unsigned r, g, b, a, inva;
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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;
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case SDL_BLENDMODE_MOD:
HLINE(Uint16, DRAW_SETPIXEL_MOD_RGB, draw_end);
break;
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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;
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case SDL_BLENDMODE_MOD:
VLINE(Uint16, DRAW_SETPIXEL_MOD_RGB, draw_end);
break;
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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;
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case SDL_BLENDMODE_MOD:
DLINE(Uint16, DRAW_SETPIXEL_MOD_RGB, draw_end);
break;
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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;
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case SDL_BLENDMODE_MOD:
AALINE(x1, y1, x2, y2,
DRAW_SETPIXELXY2_MOD_RGB, DRAW_SETPIXELXY2_MOD_RGB,
draw_end);
break;
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default:
AALINE(x1, y1, x2, y2,
DRAW_SETPIXELXY2_RGB, DRAW_SETPIXELXY2_BLEND_RGB,
draw_end);
break;
}
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}
}
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static void
SDL_BlendLine_RGB555(SDL_Surface * dst, int x1, int y1, int x2, int y2,
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SDL_BlendMode blendMode, Uint8 _r, Uint8 _g, Uint8 _b, Uint8 _a,
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SDL_bool draw_end)
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const SDL_PixelFormat *fmt = dst->format;
unsigned r, g, b, a, inva;
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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;
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case SDL_BLENDMODE_MOD:
HLINE(Uint16, DRAW_SETPIXEL_MOD_RGB555, draw_end);
break;
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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;
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case SDL_BLENDMODE_MOD:
VLINE(Uint16, DRAW_SETPIXEL_MOD_RGB555, draw_end);
break;
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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;
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case SDL_BLENDMODE_MOD:
DLINE(Uint16, DRAW_SETPIXEL_MOD_RGB555, draw_end);
break;
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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;
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case SDL_BLENDMODE_MOD:
AALINE(x1, y1, x2, y2,
DRAW_SETPIXELXY_MOD_RGB555, DRAW_SETPIXELXY_MOD_RGB555,
draw_end);
break;
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default:
AALINE(x1, y1, x2, y2,
DRAW_SETPIXELXY_RGB555, DRAW_SETPIXELXY_BLEND_RGB555,
draw_end);
break;
}
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static void
SDL_BlendLine_RGB565(SDL_Surface * dst, int x1, int y1, int x2, int y2,
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SDL_BlendMode blendMode, Uint8 _r, Uint8 _g, Uint8 _b, Uint8 _a,
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SDL_bool draw_end)
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const SDL_PixelFormat *fmt = dst->format;
unsigned r, g, b, a, inva;
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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;
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inva = (a ^ 0xff);
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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;
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case SDL_BLENDMODE_MOD:
HLINE(Uint16, DRAW_SETPIXEL_MOD_RGB565, draw_end);
break;
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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;
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case SDL_BLENDMODE_MOD:
VLINE(Uint16, DRAW_SETPIXEL_MOD_RGB565, draw_end);
break;
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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;
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case SDL_BLENDMODE_MOD:
DLINE(Uint16, DRAW_SETPIXEL_MOD_RGB565, draw_end);
break;
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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;
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case SDL_BLENDMODE_MOD:
AALINE(x1, y1, x2, y2,
DRAW_SETPIXELXY_MOD_RGB565, DRAW_SETPIXELXY_MOD_RGB565,
draw_end);
break;
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default:
AALINE(x1, y1, x2, y2,
DRAW_SETPIXELXY_RGB565, DRAW_SETPIXELXY_BLEND_RGB565,
draw_end);
break;
}
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}
}
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static void
SDL_BlendLine_RGB4(SDL_Surface * dst, int x1, int y1, int x2, int y2,
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SDL_BlendMode blendMode, Uint8 _r, Uint8 _g, Uint8 _b, Uint8 _a,
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SDL_bool draw_end)
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const SDL_PixelFormat *fmt = dst->format;
unsigned r, g, b, a, inva;
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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) {
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switch (blendMode) {
case SDL_BLENDMODE_BLEND:
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HLINE(Uint32, DRAW_SETPIXEL_BLEND_RGB, draw_end);
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break;
case SDL_BLENDMODE_ADD:
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HLINE(Uint32, DRAW_SETPIXEL_ADD_RGB, draw_end);
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break;
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case SDL_BLENDMODE_MOD:
HLINE(Uint32, DRAW_SETPIXEL_MOD_RGB, draw_end);
break;
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default:
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HLINE(Uint32, DRAW_SETPIXEL_RGB, draw_end);
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break;
}
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} else if (x1 == x2) {
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switch (blendMode) {
case SDL_BLENDMODE_BLEND:
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VLINE(Uint32, DRAW_SETPIXEL_BLEND_RGB, draw_end);
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break;
case SDL_BLENDMODE_ADD:
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VLINE(Uint32, DRAW_SETPIXEL_ADD_RGB, draw_end);
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break;
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case SDL_BLENDMODE_MOD:
VLINE(Uint32, DRAW_SETPIXEL_MOD_RGB, draw_end);
break;
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default:
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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;
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case SDL_BLENDMODE_MOD:
DLINE(Uint32, DRAW_SETPIXEL_MOD_RGB, draw_end);
break;
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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;
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case SDL_BLENDMODE_MOD:
AALINE(x1, y1, x2, y2,
DRAW_SETPIXELXY4_MOD_RGB, DRAW_SETPIXELXY4_MOD_RGB,
draw_end);
break;
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default:
AALINE(x1, y1, x2, y2,
DRAW_SETPIXELXY4_RGB, DRAW_SETPIXELXY4_BLEND_RGB,
draw_end);
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break;
}
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}
}
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static void
SDL_BlendLine_RGBA4(SDL_Surface * dst, int x1, int y1, int x2, int y2,
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SDL_BlendMode blendMode, Uint8 _r, Uint8 _g, Uint8 _b, Uint8 _a,
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SDL_bool draw_end)
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const SDL_PixelFormat *fmt = dst->format;
unsigned r, g, b, a, inva;
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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) {
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switch (blendMode) {
case SDL_BLENDMODE_BLEND:
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HLINE(Uint32, DRAW_SETPIXEL_BLEND_RGBA, draw_end);
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break;
case SDL_BLENDMODE_ADD:
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HLINE(Uint32, DRAW_SETPIXEL_ADD_RGBA, draw_end);
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break;
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case SDL_BLENDMODE_MOD:
HLINE(Uint32, DRAW_SETPIXEL_MOD_RGBA, draw_end);
break;
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default:
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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;
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case SDL_BLENDMODE_MOD:
VLINE(Uint32, DRAW_SETPIXEL_MOD_RGBA, draw_end);
break;
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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;
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case SDL_BLENDMODE_MOD:
DLINE(Uint32, DRAW_SETPIXEL_MOD_RGBA, draw_end);
break;
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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;
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case SDL_BLENDMODE_MOD:
AALINE(x1, y1, x2, y2,
DRAW_SETPIXELXY4_MOD_RGBA, DRAW_SETPIXELXY4_MOD_RGBA,
draw_end);
break;
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default:
AALINE(x1, y1, x2, y2,
DRAW_SETPIXELXY4_RGBA, DRAW_SETPIXELXY4_BLEND_RGBA,
draw_end);
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break;
}
}
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static void
SDL_BlendLine_RGB888(SDL_Surface * dst, int x1, int y1, int x2, int y2,
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SDL_BlendMode blendMode, Uint8 _r, Uint8 _g, Uint8 _b, Uint8 _a,
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SDL_bool draw_end)
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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;
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inva = (a ^ 0xff);
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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;
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case SDL_BLENDMODE_MOD:
HLINE(Uint32, DRAW_SETPIXEL_MOD_RGB888, draw_end);
break;
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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;
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case SDL_BLENDMODE_MOD:
VLINE(Uint32, DRAW_SETPIXEL_MOD_RGB888, draw_end);
break;
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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;
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case SDL_BLENDMODE_MOD:
DLINE(Uint32, DRAW_SETPIXEL_MOD_RGB888, draw_end);
break;
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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;
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case SDL_BLENDMODE_MOD:
AALINE(x1, y1, x2, y2,
DRAW_SETPIXELXY_MOD_RGB888, DRAW_SETPIXELXY_MOD_RGB888,
draw_end);
break;
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default:
AALINE(x1, y1, x2, y2,
DRAW_SETPIXELXY_RGB888, DRAW_SETPIXELXY_BLEND_RGB888,
draw_end);
break;
}
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}
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static void
SDL_BlendLine_ARGB8888(SDL_Surface * dst, int x1, int y1, int x2, int y2,
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SDL_BlendMode blendMode, Uint8 _r, Uint8 _g, Uint8 _b, Uint8 _a,
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SDL_bool draw_end)
{
const SDL_PixelFormat *fmt = dst->format;
unsigned r, g, b, a, inva;
590
if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) {
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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;
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inva = (a ^ 0xff);
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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;
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613
case SDL_BLENDMODE_MOD:
HLINE(Uint32, DRAW_SETPIXEL_MOD_ARGB8888, draw_end);
break;
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default:
HLINE(Uint32, DRAW_SETPIXEL_ARGB8888, draw_end);
break;
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} 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;
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case SDL_BLENDMODE_MOD:
VLINE(Uint32, DRAW_SETPIXEL_MOD_ARGB8888, draw_end);
break;
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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;
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case SDL_BLENDMODE_MOD:
DLINE(Uint32, DRAW_SETPIXEL_MOD_ARGB8888, draw_end);
break;
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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;
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662
663
664
case SDL_BLENDMODE_MOD:
AALINE(x1, y1, x2, y2,
DRAW_SETPIXELXY_MOD_ARGB8888, DRAW_SETPIXELXY_MOD_ARGB8888,
draw_end);
break;
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667
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675
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,
676
SDL_BlendMode blendMode,
677
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681
682
683
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685
686
687
688
689
690
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;
691
692
}
break;
693
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695
696
case 4:
if (fmt->Rmask == 0x00FF0000) {
if (fmt->Amask) {
return SDL_BlendLine_ARGB8888;
697
} else {
698
699
700
701
702
703
704
return SDL_BlendLine_RGB888;
}
} else {
if (fmt->Amask) {
return SDL_BlendLine_RGBA4;
} else {
return SDL_BlendLine_RGB4;
705
706
707
}
}
}
708
709
return NULL;
}
711
712
int
SDL_BlendLine(SDL_Surface * dst, int x1, int y1, int x2, int y2,
713
SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
{
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;
733
734
735
func(dst, x1, y1, x2, y2, blendMode, r, g, b, a, SDL_TRUE);
return 0;
738
739
int
SDL_BlendLines(SDL_Surface * dst, const SDL_Point * points, int count,
740
SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
741
742
743
744
{
int i;
int x1, y1;
int x2, y2;
745
746
SDL_bool draw_end;
BlendLineFunc func;
747
748
if (!dst) {
749
SDL_SetError("SDL_BlendLines(): Passed NULL destination surface");
750
751
752
return -1;
}
753
754
func = SDL_CalculateBlendLineFunc(dst->format);
if (!func) {
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
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;
}
771
772
773
774
/* 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);
775
776
}
if (points[0].x != points[count-1].x || points[0].y != points[count-1].y) {
777
778
SDL_BlendPoint(dst, points[count-1].x, points[count-1].y,
blendMode, r, g, b, a);
783
784
#endif /* !SDL_RENDER_DISABLED */
785
/* vi: set ts=4 sw=4 expandtab: */