Mercurial > MadButterfly

annotate src/chgcolor.c @ 314:6c350fc92ae3

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Cache rednering result is now workable. - Know issues - For unknow issue, CAIRO_OPERATOR_CLEAR will not be limited by clipping. Image will be cleaned in a strange way. Maybe, it is a bug of Cairo.
author Thinker K.F. Li <thinker@branda.to>
date Thu, 05 Mar 2009 00:54:42 +0800
parents 530bb7728546
children 586e50f82c1f
rev   line source
116
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1 #include <stdio.h>
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2 #include <stdlib.h>
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3 #include "mb_animate.h"
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4 #include "mb_paint.h"
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5
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6 static float comp_mb_timeval_ratio(const mb_timeval_t *a,
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7 const mb_timeval_t *b) {
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8 float ratio;
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9
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10 ratio = (float)MB_TIMEVAL_SEC(a) * 1000000.0 + (float)MB_TIMEVAL_USEC(a);
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11 ratio /= (float)MB_TIMEVAL_SEC(b) * 1000000.0 + (float)MB_TIMEVAL_USEC(b);
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12 return ratio;
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13 }
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14
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15 typedef struct _mb_chgcolor mb_chgcolor_t;
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16
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17 struct _mb_chgcolor {
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18 mb_action_t action;
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19
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20 co_comp_t r, g, b, a;
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21 paint_t *paint;
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22
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23 mb_timeval_t start_time;
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24 const mb_timeval_t *playing_time;
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25 co_comp_t s_r, s_g, s_b, s_a; /*!< saved RGBA values. */
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26 };
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27
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28 static void mb_chgcolor_start(mb_action_t *act,
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29 const mb_timeval_t *now,
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30 const mb_timeval_t *playing_time,
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31 redraw_man_t *rdman) {
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32 mb_chgcolor_t *chg = (mb_chgcolor_t *)act;
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33
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34 MB_TIMEVAL_CP(&chg->start_time, now);
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35 chg->playing_time = playing_time; /* playing_time is in word,
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36 * it live time is as long as
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37 * actions. */
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38 paint_color_get(chg->paint,
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39 &chg->s_r, &chg->s_g,
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40 &chg->s_b, &chg->s_a);
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41 }
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42
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43 static void mb_chgcolor_step(mb_action_t *act,
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44 const mb_timeval_t *now,
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45 redraw_man_t *rdman) {
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46 mb_chgcolor_t *chg = (mb_chgcolor_t *)act;
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47 mb_timeval_t diff;
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48 co_comp_t r, g, b, a;
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49 float ratio, comp;
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50
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51 MB_TIMEVAL_CP(&diff, now);
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52 MB_TIMEVAL_DIFF(&diff, &chg->start_time);
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53 ratio = comp_mb_timeval_ratio(&diff, chg->playing_time);
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54 comp = 1 - ratio;
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55
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56 r = chg->s_r * comp + ratio * chg->r;
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57 g = chg->s_g * comp + ratio * chg->g;
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58 b = chg->s_b * comp + ratio * chg->b;
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59 a = chg->s_a * comp + ratio * chg->a;
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60 paint_color_set(chg->paint, r, g, b, a);
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61
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62 rdman_paint_changed(rdman, chg->paint);
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63 }
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64
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65 static void mb_chgcolor_stop(mb_action_t *act,
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66 const mb_timeval_t *now,
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67 redraw_man_t *rdman) {
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68 mb_chgcolor_t *chg = (mb_chgcolor_t *)act;
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69
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70 paint_color_set(chg->paint, chg->r, chg->g, chg->b, chg->a);
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71
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72 rdman_paint_changed(rdman, chg->paint);
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73 }
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74
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75 static void mb_chgcolor_free(mb_action_t *act) {
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76 free(act);
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77 }
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78
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79 mb_action_t *mb_chgcolor_new(co_comp_t r, co_comp_t g,
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80 co_comp_t b, co_comp_t a,
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81 paint_t *paint, mb_word_t *word) {
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82 mb_chgcolor_t *chg;
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83
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84 chg = (mb_chgcolor_t *)malloc(sizeof(mb_chgcolor_t));
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85 if(chg == NULL)
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86 return NULL;
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87
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88 chg->r = r;
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89 chg->g = g;
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90 chg->b = b;
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91 chg->a = a;
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92
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93 chg->paint = paint;
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94
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95 chg->action.start = mb_chgcolor_start;
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96 chg->action.step = mb_chgcolor_step;
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97 chg->action.stop = mb_chgcolor_stop;
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98 chg->action.free = mb_chgcolor_free;
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99
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100 mb_word_add_action(word, (mb_action_t *)chg);
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101
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102 return (mb_action_t *)chg;
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103 }
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104
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105