Mercurial > MadButterfly

annotate src/paint.c @ 21:83d24300a992

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opacity (alpha) channel
author Thinker K.F. Li <thinker@branda.to>
date Sat, 02 Aug 2008 16:06:53 +0800
parents cf6d65398619
children 56f592f56ff7
rev   line source
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0f3baa488a62 Support solid color paint for fill.
Thinker K.F. Li <thinker@branda.to>
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1 #include <stdio.h>
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2 #include <stdlib.h>
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3 #include <cairo.h>
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4 #include "paint.h"
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5
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6 typedef struct _paint_color {
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7 paint_t paint;
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8 co_comp_t r, g, b, a;
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9 redraw_man_t *rdman;
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10 } paint_color_t;
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13 static void paint_color_prepare(paint_t *paint, cairo_t *cr) {
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14 paint_color_t *color = (paint_color_t *)paint;
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16 cairo_set_source_rgba(cr, color->r, color->g, color->b, color->a);
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17 }
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19 static void paint_color_free(paint_t *paint) {
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20 paint_color_t *color = (paint_color_t *)paint;
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22 shnode_list_free(color->rdman, paint->members);
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23 free(paint);
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24 }
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25
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26 paint_t *paint_color_new(redraw_man_t *rdman,
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27 co_comp_t r, co_comp_t g,
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28 co_comp_t b, co_comp_t a) {
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29 paint_color_t *color;
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30
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31 color = (paint_color_t *)malloc(sizeof(paint_color_t));
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32 if(color == NULL)
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33 return NULL;
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34 color->rdman = rdman;
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35 color->r = r;
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36 color->g = g;
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37 color->b = b;
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38 color->a = a;
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39 paint_init(&color->paint, paint_color_prepare, paint_color_free);
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40 return (paint_t *)color;
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41 }
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43 void paint_color_set(paint_t *paint,
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44 co_comp_t r, co_comp_t g,
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45 co_comp_t b, co_comp_t a) {
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46 paint_color_t *color = (paint_color_t *)paint;
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47
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48 color->r = r;
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49 color->g = g;
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50 color->b = b;
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51 color->a = a;
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52 }