/* -*- indent-tabs-mode: nil; tab-width: 4; c-basic-offset: 4; -*-
image.c for the Openbox window manager
- Copyright (c) 2003 Ben Jansens
+ Copyright (c) 2006 Mikael Magnusson
+ Copyright (c) 2003-2007 Dana Jansens
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
#define FLOOR(i) ((i) & (~0UL << FRACTION))
#define AVERAGE(a, b) (((((a) ^ (b)) & 0xfefefefeL) >> 1) + ((a) & (b)))
-static RrPixel32* scale_half(RrPixel32 *source, gint w, gint h)
-{
- RrPixel32 *out, *dest, *sourceline, *sourceline2;
- gint dw, dh, x, y;
-
- sourceline = source;
- sourceline2 = source + w;
-
- dw = w >> 1;
- dh = h >> 1;
-
- out = dest = g_new(RrPixel32, dw * dh);
-
- for (y = 0; y < dh; ++y) {
- RrPixel32 *s, *s2;
-
- s = sourceline;
- s2 = sourceline2;
-
- for (x = 0; x < dw; ++x) {
- *dest++ = AVERAGE(AVERAGE(*s, *(s+1)),
- AVERAGE(*s2, *(s2+1)));
- s += 2;
- s2 += 2;
- }
- sourceline += w << 1;
- sourceline2 += w << 1;
- }
- return out;
-}
-
static void ImageCopyResampled(RrPixel32 *dst, RrPixel32 *src,
gulong dstW, gulong dstH,
gulong srcW, gulong srcH)
portionXY = (portionX * portionY) >> FRACTION;
sumXY += portionXY;
- pixel = *(src + (srcY >> FRACTION) * srcW + (srcX >> FRACTION));
- red += ((pixel >> RrDefaultRedOffset) & 0xFF) * portionXY;
- green += ((pixel >> RrDefaultGreenOffset) & 0xFF) * portionXY;
- blue += ((pixel >> RrDefaultBlueOffset) & 0xFF) * portionXY;
- alpha += ((pixel >> RrDefaultAlphaOffset) & 0xFF) * portionXY;
+ pixel = *(src + (srcY >> FRACTION) * srcW
+ + (srcX >> FRACTION));
+ red += ((pixel >> RrDefaultRedOffset) & 0xFF)
+ * portionXY;
+ green += ((pixel >> RrDefaultGreenOffset) & 0xFF)
+ * portionXY;
+ blue += ((pixel >> RrDefaultBlueOffset) & 0xFF)
+ * portionXY;
+ alpha += ((pixel >> RrDefaultAlphaOffset) & 0xFF)
+ * portionXY;
}
}