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#include <glib.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include "util.h"
/*
* derived from http://www.gnu.org/software/guile-gnome/docs/gdk/html/The-GdkPixbuf-Structure.html
*/
guchar *pixbuf_point(GdkPixbuf *pixbuf, point_t point)
{
#if 0
g_assert(point.x >= 0 && point.x < gdk_pixbuf_get_width (pixbuf));
g_assert(point.y >= 0 && point.y < gdk_pixbuf_get_height(pixbuf));
g_assert(gdk_pixbuf_get_bits_per_sample(pixbuf) == 8);
#endif
return gdk_pixbuf_get_pixels(pixbuf)
+ point.y * gdk_pixbuf_get_rowstride (pixbuf)
+ point.x * gdk_pixbuf_get_n_channels(pixbuf);
}
void put_pixel(GdkPixbuf *pixbuf, point_t point, color_t color)
{
//const gint n_channels = gdk_pixbuf_get_n_channels(pixbuf);
#if 0
g_assert(n_channels == 4 || n_channels == 3);
g_assert(gdk_pixbuf_get_colorspace(pixbuf) == GDK_COLORSPACE_RGB);
g_assert(gdk_pixbuf_get_bits_per_sample(pixbuf) == 8);
#endif
guchar *p = pixbuf_point(pixbuf, point);
p[0] = color.r;
p[1] = color.g;
p[2] = color.b;
#if 0
if (n_channels == 4)
p[3] = color.a;
#endif
}
color_t get_pixel(GdkPixbuf *pixbuf, point_t point)
{
//const gint n_channels = gdk_pixbuf_get_n_channels(pixbuf);
#if 0
g_assert(gdk_pixbuf_get_colorspace(pixbuf) == GDK_COLORSPACE_RGB);
g_assert(gdk_pixbuf_get_bits_per_sample(pixbuf) == 8);
g_assert(n_channels == 4 || n_channels == 3);
#endif
guchar *p = pixbuf_point(pixbuf, point);
return COLOR(p[0], p[1], p[2], 0 /*n_channels == 4 ? p[3] : COL_MAX*/);
}
void color_to_yiq(color_t color, guint8 *y, guint8 *i, guint8 *q)
{
if (y)
*y = 0.299 * color.r + 0.587 * color.g + 0.115 * color.b;
if (i)
*i = 0.595716 * color.r - 0.274453 * color.g - 0.321263 * color.b;
if (q)
*q = 0.211456 * color.r - 0.522591 * color.g + 0.311135 * color.b;
}
/*
* http://en.wikipedia.org/wiki/Digital_compositing
*/
color_t tint(color_t src, color_t tint_color)
{
return COLOR(
(tint_color.a * tint_color.r + (255 - tint_color.a) * src.r) / 255,
(tint_color.a * tint_color.g + (255 - tint_color.a) * src.g) / 255,
(tint_color.a * tint_color.b + (255 - tint_color.a) * src.b) / 255,
src.a);
}
color32_t color32_add(color32_t a, color32_t b)
{
return COLOR32(
a.r + b.r,
a.g + b.g,
a.b + b.b
);
}
color32_t color32_mult(color32_t a, gint multiplier)
{
return COLOR32(
multiplier * a.r,
multiplier * a.g,
multiplier * a.b
);
}
color32_t to_color32(color_t a)
{
return COLOR32(a.r, a.g, a.b);
}
colord_t colord_add(colord_t a, colord_t b)
{
return COLORD(
a.r + b.r,
a.g + b.g,
a.b + b.b,
a.a + b.a
);
}
colord_t colord_mult(colord_t a, gdouble multiplier)
{
return COLORD(
multiplier * a.r,
multiplier * a.g,
multiplier * a.b,
multiplier * a.a
);
}
colord_t to_colord(color_t a)
{
return COLORD(a.r, a.g, a.b, a.a);
}
void ring_shift(void *_pntr, gint num, size_t size)
{
g_assert(num >= 2);
guint8 *pntr = (guint8*) _pntr;
char *tmp = g_malloc(size);
g_memmove(tmp, pntr, size);
for (gint i = 0; i < (num-1)*size; i+=size)
g_memmove(pntr+i, pntr+i+size, size);
g_memmove(pntr + (num-1)*size, tmp, size);
g_free(tmp);
}
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