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Added color reduction for 16bpp displays

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This commit is contained in:
Derek Foreman 2003-01-23 18:47:47 +00:00
parent 47fb66e54b
commit d4e4e25e28
2 changed files with 39 additions and 7 deletions
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43
otk/truerendercontrol.cc
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@ -156,19 +156,19 @@ void TrueRenderControl::drawGradientBackground(
if (texture.bevel() == RenderTexture::Bevel1) {
for (off = 1, x = 1; x < w - 1; ++x, off++)
highlight(data + off,
data + off + (h-1) * w,
texture.relief()==RenderTexture::Raised);
data + off + (h-1) * w,
texture.relief()==RenderTexture::Raised);
for (off = 0, x = 0; x < h; ++x, off++)
highlight(data + off * w,
data + off * w + w - 1,
texture.relief()==RenderTexture::Raised);
data + off * w + w - 1,
texture.relief()==RenderTexture::Raised);
}
if (texture.bevel() == RenderTexture::Bevel2) {
for (off = 2, x = 2; x < w - 2; ++x, off++)
highlight(data + off + w,
data + off + (h-2) * w,
texture.relief()==RenderTexture::Raised);
data + off + (h-2) * w,
texture.relief()==RenderTexture::Raised);
for (off = 1, x = 1; x < h-1; ++x, off++)
highlight(data + off * w + 1,
data + off * w + w - 2,
@ -176,7 +176,8 @@ void TrueRenderControl::drawGradientBackground(
}
}
//XXX: any dithering should be done now
reduceDepth(im, data);
im->data = (char*) data;
sf.setPixmap(im);
@ -186,6 +187,34 @@ void TrueRenderControl::drawGradientBackground(
XDestroyImage(im);
}
void TrueRenderControl::reduceDepth(XImage *im, pixel32 *data) const
{
int r, g, b;
int x,y;
pixel16 *p = (pixel16 *)data;
switch (im->bits_per_pixel) {
case 32:
return;
case 16:
for (y = 0; y < im->height; y++) {
for (x = 0; x < im->width; x++) {
r = (data[x] >> 16) & 0xFF;
r = r >> _red_shift;
g = (data[x] >> 8) & 0xFF;
g = g >> _green_shift;
b = data[x] & 0xFF;
b = b >> _blue_shift;
p[x] = (r << _red_offset) + (g << _green_offset) + (b << _blue_offset);
}
data += im->width;
p += im->bytes_per_line/2;
}
break;
default:
printf("your bit depth is currently unhandled\n");
}
}
void TrueRenderControl::highlight(pixel32 *x, pixel32 *y, bool raised) const
{
int r, g, b;

3
otk/truerendercontrol.hh
View file

@ -22,8 +22,10 @@ namespace otk {
#ifdef HAVE_STDINT_H
typedef uint32_t pixel32;
typedef uint16_t pixel16;
#else
typedef u_int32_t pixel32;
typedef u_int16_t pixel16;
#endif
class TrueRenderControl : public RenderControl {
@ -48,6 +50,7 @@ public:
const RenderTexture &texture) const;
inline void highlight(pixel32 *x, pixel32 *y, bool raised) const;
void reduceDepth(XImage *im, pixel32 *data) const;
};
}