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annotate src/texture.c @ 39:9d1421c09dfb

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core: add more utilities to improve code simplicity
author David Demelier <markand@malikania.fr>
date Tue, 14 Jan 2020 13:05:45 +0100
parents 783841af4033
children b815621df3e3
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1 /*
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2 * texture.c -- basic texture management
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3 *
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4 * Copyright (c) 2020 David Demelier <markand@malikania.fr>
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5 *
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6 * Permission to use, copy, modify, and/or distribute this software for any
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7 * purpose with or without fee is hereby granted, provided that the above
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8 * copyright notice and this permission notice appear in all copies.
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9 *
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10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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17 */
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18
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19 #include <assert.h>
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20
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21 #include "error.h"
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22 #include "error_p.h"
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23 #include "texture.h"
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24 #include "texture_p.h"
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25 #include "util.h"
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26 #include "window_p.h"
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27
28
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28 struct texture *
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29 texture_new(uint16_t w, uint16_t h)
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30 {
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31 struct texture *tex = emalloc(sizeof (struct texture));
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32
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33 if (!(tex->handle = SDL_CreateTexture(win.renderer,
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34 SDL_PIXELFORMAT_RGBA8888, SDL_TEXTUREACCESS_TARGET, w, h))) {
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35 error_sdl();
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36 free(tex);
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37 return NULL;
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38 }
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39
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40 return tex;
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41 }
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42
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43 bool
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44 texture_get_size(struct texture *tex, uint16_t *w, uint16_t *h)
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45 {
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46 assert(tex);
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47
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48 int rw, rh;
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49
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50 if (SDL_QueryTexture(tex->handle, NULL, NULL, &rw, &rh) < 0) {
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51 error_sdl();
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52 *w = 0;
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53 *h = 0;
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54 return false;
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55 }
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56
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57 *w = rw;
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58 *h = rh;
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59
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60 return true;
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61 }
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62
3
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63 void
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64 texture_draw(struct texture *tex, int x, int y)
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65 {
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66 SDL_Rect dst = {
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67 .x = x,
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68 .y = y,
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69 .w = 0,
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70 .h = 0
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71 };
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72
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73 assert(tex);
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74
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75 /* We need to determine size */
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76 SDL_QueryTexture(tex->handle, NULL, NULL, &dst.w, &dst.h);
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77 SDL_RenderCopy(win.renderer, tex->handle, NULL, &dst);
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78 }
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79
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80 void
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81 texture_draw_ex(struct texture *tex,
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82 int src_x,
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83 int src_y,
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84 unsigned src_w,
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85 unsigned src_h,
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86 int dst_x,
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87 int dst_y,
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88 unsigned dst_w,
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89 unsigned dst_h,
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90 double angle)
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91 {
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92 const SDL_Rect src = {
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93 .x = src_x,
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94 .y = src_y,
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95 .w = src_w,
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96 .h = src_h
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97 };
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98 const SDL_Rect dst = {
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99 .x = dst_x,
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100 .y = dst_y,
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101 .w = dst_w,
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102 .h = dst_h
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103 };
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104
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105 SDL_RenderCopyEx(win.renderer, tex->handle, &src, &dst, angle, NULL, SDL_FLIP_NONE);
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106 }
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107
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108 void
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109 texture_close(struct texture *tex)
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110 {
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111 assert(tex);
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112
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113 SDL_DestroyTexture(tex->handle);
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114 free(tex);
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115 }
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116
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117 /* private */
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118
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119 struct texture *
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120 texture_from_surface(SDL_Surface *surface)
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121 {
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122 assert(surface);
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123
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124 struct texture *texture = ecalloc(1, sizeof (struct texture));
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125
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126 if (!(texture->handle = SDL_CreateTextureFromSurface(win.renderer, surface))) {
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127 error_sdl();
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128 free(texture);
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129 return NULL;
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130 }
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131
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132 return texture;
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133 }