* Copyright 2021, Haiku, Inc.
* Distributed under the terms of the MIT License.
*/
#include "graphics.h"
RasBuf32 gFramebuf = {NULL, 0, 0, 0};
void
Clear(RasBuf32 vb, uint32_t c)
{
vb.stride -= vb.width;
for (; vb.height > 0; vb.height--) {
for (int x = 0; x < vb.width; x++) {
*vb.colors = c;
vb.colors++;
}
vb.colors += vb.stride;
}
}
template <typename Color>
RasBuf<Color>
RasBuf<Color>::Clip(int x, int y, int w, int h) const
{
RasBuf<Color> vb = *this;
if (x < 0) {w += x; x = 0;}
if (y < 0) {h += y; y = 0;}
if (x + w > vb.width) {w = vb.width - x;}
if (y + h > vb.height) {h = vb.height - y;}
if (w > 0 && h > 0) {
vb.colors += y*vb.stride + x;
vb.width = w;
vb.height = h;
} else {
vb.colors = 0;
vb.width = 0;
vb.height = 0;
}
return vb;
}
template class RasBuf<uint8>;
template class RasBuf<uint32>;
RasBuf8
Font::ThisGlyph(uint32 ch)
{
if (ch < firstChar || ch >= firstChar + charCnt)
return ThisGlyph(' ');
RasBuf8 rb;
rb.colors = data + (ch - firstChar) * charWidth * charHeight;
rb.stride = charWidth;
rb.width = charWidth;
rb.height = charHeight;
return rb;
}
void
BlitMaskRgb(RasBuf32 dst, RasBuf8 src, int32 x, int32 y, uint32_t c)
{
int dstW, dstH;
uint32_t dc, a;
dstW = dst.width; dstH = dst.height;
dst = dst.Clip(x, y, src.width, src.height);
src = src.Clip(-x, -y, dstW, dstH);
dst.stride -= dst.width;
src.stride -= src.width;
for (; dst.height > 0; dst.height--) {
for (x = dst.width; x > 0; x--) {
dc = *dst.colors;
a = *src.colors;
if (a != 0) {
*dst.colors =
((((dc >> 0) % 0x100) * (0xff - a) / 0xff
+ ((c >> 0) % 0x100) * a / 0xff) << 0)
+ ((((dc >> 8) % 0x100) * (0xff - a) / 0xff
+ ((c >> 8) % 0x100) * a / 0xff) << 8)
+ ((((dc >> 16) % 0x100) * (0xff - a) / 0xff
+ ((c >> 16) % 0x100) * a / 0xff) << 16)
+ (dc & 0xff000000);
}
dst.colors++;
src.colors++;
}
dst.colors += dst.stride;
src.colors += src.stride;
}
}
