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annotate src/dmimage.c @ 2294:7f6ba3b32f54

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Cleanups.
author Matti Hamalainen <ccr@tnsp.org>
date Wed, 03 Jul 2019 10:28:43 +0300
parents 7a2337dcd1b3
children 0e355702435d
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1 /*
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2 * DMLib
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3 * -- Bitmap image conversion and loading
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4 * Programmed and designed by Matti 'ccr' Hamalainen
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5 * (C) Copyright 2012-2015 Tecnic Software productions (TNSP)
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6 */
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7 #include "dmimage.h"
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8 #include "dmzlib.h"
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9
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10 // Formats
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11 #define STBI_ONLY_JPEG 1
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12 #define STBI_ONLY_PNG 1
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13 //#define STBI_NO_HDR 1
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14
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15 // Other options, etc.
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16 #ifndef DM_DEBUG
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17 #define STBI_NO_FAILURE_STRINGS 1
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18 #define STBI_ASSERT(x)
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19 #endif
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20 #define STBI_FAILURE_USERMSG 1
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21
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22 #define STB_IMAGE_IMPLEMENTATION 1
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23 #define STBI_NO_STDIO 1
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24
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25 #include "stb_image.c"
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26
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27
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28 SDL_Surface *dmCreateRGBSurfaceFrom(void *data,
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29 const int width, const int height,
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30 const int depth, const int pitch,
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31 const Uint32 format)
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32 {
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33 // Create source surface from given data
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34 SDL_Surface
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35 *result = NULL,
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36 *tmp = SDL_CreateRGBSurfaceWithFormatFrom(data, width, height, depth, pitch, format);
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37
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38 // Create result conversion surface
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39 if (tmp != NULL)
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40 {
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41 result = SDL_ConvertSurfaceFormat(tmp, SDL_PIXELFORMAT_RGBA32, 0);
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42 SDL_FreeSurface(tmp);
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43 }
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44
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45 return result;
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46 }
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47
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48
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49 SDL_Surface *dmCreatePaletteSurfaceFrom(void *data, const int width, const int height, const int pitch)
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50 {
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51 int yc;
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52 Uint8 *dst, *src;
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53 SDL_Surface *result;
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54 result = SDL_CreateRGBSurfaceWithFormat(0, width, height, 8, SDL_PIXELFORMAT_INDEX8);
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55 if (result == NULL)
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56 return NULL;
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57
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58 dst = result->pixels;
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59 src = data;
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60 for (yc = 0; yc < height; yc++)
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61 {
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62 memcpy(dst, src, width * sizeof(Uint8));
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63 dst += result->pitch;
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64 src += pitch;
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65 }
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66
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67 return result;
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68 }
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69
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70
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71 static int dmSTBIread(void *user, char *data, int size)
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72 {
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73 return dmfread(data, 1, size, (DMResource *) user);
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74 }
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75
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76
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77 static void dmSTBIskip(void *user, int n)
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78 {
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79 dmfseek((DMResource *) user, n, SEEK_CUR);
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80 }
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81
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82
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83 static int dmSTBIeof(void *user)
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84 {
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85 return dmfeof((DMResource *) user);
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86 }
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87
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88
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89 static const stbi_io_callbacks dmSTBICallbacks =
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90 {
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91 dmSTBIread,
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92 dmSTBIskip,
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93 dmSTBIeof,
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94 };
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95
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96
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97 SDL_Surface *dmLoadImage(DMResource *file)
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98 {
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99 SDL_Surface *result = NULL;
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100 int width = 0, height = 0, comp = 0;
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101 Uint8 *data;
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102
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103 dmfreset(file);
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104 data = stbi_load_from_callbacks(&dmSTBICallbacks, file, &width, &height, &comp, 0);
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105
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106 if (data == NULL)
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107 {
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108 dmErrorDBGMsg(
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109 "Error decoding image resource %p '%s' [%d, %d, %d]: %s\n",
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110 file, file->filename, width, height, comp, stbi_failure_reason());
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111 return NULL;
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112 }
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113
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114
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115 switch (comp)
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116 {
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117 case 4:
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118 result = dmCreateRGBSurfaceFrom(data, width, height, comp * 8, width * comp,
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119 #if SDL_BYTEORDER == SDL_BIG_ENDIAN
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120 SDL_PIXELFORMAT_ABGR8888
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121 #else
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122 SDL_PIXELFORMAT_ARGB8888
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123 #endif
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124 );
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125 break;
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126
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127 case 3:
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128 // These masks are different from the dmX*masks
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129 result = dmCreateRGBSurfaceFrom(data, width, height, comp * 8, width * comp,
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130 #if SDL_BYTEORDER == SDL_BIG_ENDIAN
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131 SDL_PIXELFORMAT_BGR888
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132 #else
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133 SDL_PIXELFORMAT_RGB888
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134 #endif
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135 );
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136 break;
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137
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138 case 1:
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139 result = dmCreatePaletteSurfaceFrom(data, width, height, width * comp);
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140 break;
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141 }
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142
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143 stbi_image_free(data);
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144
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145 if (result == NULL)
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146 {
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147 dmErrorDBGMsg(
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148 "Format conversion failed for image resource %p '%s' [%d, %d, %d].\n",
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149 file, file->filename, width, height, comp);
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150 }
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151
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152 return result;
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153 }
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154
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155
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156 SDL_Texture *dmLoadImageToTexture(DMResource *file, SDL_Renderer *renderer)
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parents: 1203
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157 {
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parents: 1203
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158 SDL_Surface *tmp;
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parents: 1203
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159 SDL_Texture *texture;
5e5f75b45f8d Initial port to SDL2. Many things will not work now.
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parents: 1203
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160
5e5f75b45f8d Initial port to SDL2. Many things will not work now.
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parents: 1203
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161 // Sanity checks
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162 if (renderer == NULL || file == NULL)
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163 return NULL;
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parents: 1203
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164
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parents: 1203
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165 if ((tmp = dmLoadImage(file)) == NULL)
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parents: 1203
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166 return NULL;
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parents: 1203
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167
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parents: 1203
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168 // Attempt to create the texture
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parents: 1203
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169 texture = SDL_CreateTextureFromSurface(renderer, tmp);
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parents: 1203
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170 SDL_FreeSurface(tmp);
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parents: 1203
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171
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172 return texture;
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parents: 1203
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173 }