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color transform

This commit is contained in:
Vadim Lopatin 2014-04-11 14:40:12 +04:00
parent 5accf91de5
commit 07599d0bc4
1 changed files with 41 additions and 0 deletions
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41
src/dlangui/graphics/drawbuf.d
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@ -3,6 +3,9 @@ module dlangui.graphics.drawbuf;
public import dlangui.core.types;
import dlangui.core.logger;
immutable uint COLOR_TRANSFORM_OFFSET_NONE = 0x80808080;
immutable uint COLOR_TRANSFORM_MULTIPLY_NONE = 0x80808080;
/// blend two RGB pixels using alpha
uint blendARGB(uint dst, uint src, uint alpha) {
uint dstalpha = dst >> 24;
@ -28,6 +31,26 @@ ubyte rgbToGray(uint color) {
return cast(uint)(((srcr + srcg + srcg + srcb) >> 2) & 0xFF);
}
uint transformComponent(int src, int addBefore, int multiply, int addAfter) {
int add1 = (cast(int)(addBefore << 1)) - 0x100;
int add2 = (cast(int)(addAfter << 1)) - 0x100;
int mul = cast(int)(multiply << 2);
int res = (((src + add1) * mul) >> 8) + add2;
if (res < 0)
res = 0;
else if (res > 255)
res = 255;
return cast(uint)res;
}
uint transformRGBA(uint src, uint addBefore, uint multiply, uint addAfter) {
uint a = transformComponent(src >> 24, addBefore >> 24, multiply >> 24, addAfter >> 24);
uint r = transformComponent((src >> 16) & 0xFF, (addBefore >> 16) & 0xFF, (multiply >> 16) & 0xFF, (addAfter >> 16) & 0xFF);
uint g = transformComponent((src >> 8) & 0xFF, (addBefore >> 8) & 0xFF, (multiply >> 8) & 0xFF, (addAfter >> 8) & 0xFF);
uint b = transformComponent(src & 0xFF, addBefore & 0xFF, multiply & 0xFF, addAfter & 0xFF);
return (a << 24) | (r << 16) | (g << 8) | b;
}
/// blend two RGB pixels using alpha
ubyte blendGray(ubyte dst, ubyte src, uint alpha) {
uint ialpha = 256 - alpha;
@ -237,6 +260,12 @@ class DrawBuf : RefCountedObject {
void drawImage(int x, int y, DrawBuf src) {
drawFragment(x, y, src, Rect(0, 0, src.width, src.height));
}
/// create drawbuf with copy of current buffer with changed colors (returns this if not supported)
DrawBuf transformColors(uint addBefore, uint multiply, uint addAfter) {
return this;
}
void clear() {}
~this() { clear(); }
}
@ -677,6 +706,18 @@ class ColorDrawBuf : ColorDrawBufBase {
for (int i = 0; i < len; i++)
p[i] = color;
}
override DrawBuf transformColors(uint addBefore, uint multiply, uint addAfter) {
if (addBefore == COLOR_TRANSFORM_OFFSET_NONE && addAfter == COLOR_TRANSFORM_OFFSET_NONE && multiply == COLOR_TRANSFORM_MULTIPLY_NONE)
return this;
ColorDrawBuf res = new ColorDrawBuf(_dx, _dy);
for (int y = 0; y < _dy; y++) {
uint * srcline = scanLine(y);
uint * dstline = res.scanLine(y);
for (int x = 0; x < _dx; x++)
dstline[x] = transformRGBA(srcline[x], addBefore, multiply, addAfter);
}
return res;
}
}