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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 Tecnic Software productions (TNSP)
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6 */
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7 #include "dmimage.h"
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8
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9
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10 #define STBI_FAILURE_USERMSG 1
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11 #define STBI_NO_STDIO 1
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12 #define STBI_NO_HDR 1
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13 #include "stb_image.c"
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14
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15
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16 SDL_Surface *dmCreateRGBSurfaceFrom(void *data, const int width, const int height, const int depth, const int pitch, const int rmask, const int gmask, const int bmask, const int amask)
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17 {
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18 SDL_Surface *tmp, *pixtmp, *result = NULL;
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19
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20 tmp = SDL_CreateRGBSurfaceFrom(data, width, height, depth, pitch, bmask, gmask, rmask, amask);
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21
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22 pixtmp = SDL_CreateRGBSurface(SDL_SWSURFACE | SDL_SRCALPHA, 10, 10, 32, rmask, gmask, bmask, amask);
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23 if (tmp != NULL && pixtmp != NULL)
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24 {
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25 result = SDL_ConvertSurface(tmp, pixtmp->format, SDL_SWSURFACE | SDL_SRCALPHA);
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26 SDL_FreeSurface(tmp);
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27 }
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28 if (pixtmp != NULL)
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29 SDL_FreeSurface(pixtmp);
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30
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31 return result;
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32 }
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33
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34
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35 SDL_Surface *dmCreatePaletteSurfaceFrom(void *data, const int width, const int height, const int pitch)
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36 {
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37 int yc;
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38 Uint8 *dst, *src;
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39 SDL_Surface *result;
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40 result = SDL_CreateRGBSurface(SDL_SWSURFACE, width, height, 8, 0,0,0,0);
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41 if (result == NULL)
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42 return NULL;
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43
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44 dst = result->pixels;
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45 src = data;
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46 for (yc = 0; yc < height; yc++)
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47 {
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48 memcpy(dst, src, width * sizeof(Uint8));
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49 dst += result->pitch;
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50 src += pitch;
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51 }
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52
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53 return result;
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54 }
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55
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56
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57
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58 static int dmSTBIread(void *user, char *data, int size)
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59 {
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60 return dmfread(data, 1, size, (DMResource *) user);
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61 }
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62
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63
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64 static void dmSTBIskip(void *user, unsigned int n)
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65 {
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66 dmfseek((DMResource *) user, n, SEEK_CUR);
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67 }
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68
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69
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70 static int dmSTBIeof(void *user)
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71 {
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72 return dmfeof((DMResource *) user);
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73 }
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74
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75
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76 static const stbi_io_callbacks dmSTBICallbacks =
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77 {
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78 dmSTBIread,
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79 dmSTBIskip,
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80 dmSTBIeof,
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81 };
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82
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83
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84 SDL_Surface *dmLoadImage(DMResource *file)
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85 {
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86 Uint32 rmask, gmask, bmask, amask;
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87 SDL_Surface *result = NULL;
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88 int width, height, comp;
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89 Uint8 *data;
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90
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91 data = stbi_load_from_callbacks(&dmSTBICallbacks, file, &width, &height, &comp, 0);
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92
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93 if (data == NULL)
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94 {
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95 dmError("Error decoding image resource %p '%s' [%d, %d, %d]: %s\n",
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96 file, file->filename, width, height, comp, stbi_failure_reason());
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97 return NULL;
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98 }
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99
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100 #if SDL_BYTEORDER == SDL_BIG_ENDIAN
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101 rmask = 0xff000000;
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102 gmask = 0x00ff0000;
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103 bmask = 0x0000ff00;
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104 amask = 0x000000ff;
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105 #else
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106 rmask = 0x000000ff;
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107 gmask = 0x0000ff00;
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108 bmask = 0x00ff0000;
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109 amask = 0xff000000;
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110 #endif
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111
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112 switch (comp)
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113 {
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114 case 4:
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115 case 3:
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116 result = dmCreateRGBSurfaceFrom(data, width, height, comp * 8,
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117 width * comp, rmask, gmask, bmask, amask);
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118 break;
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119
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120 case 1:
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121 result = dmCreatePaletteSurfaceFrom(data, width, height, width * comp);
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122 break;
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123 }
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124
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125 stbi_image_free(data);
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126
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127 if (result == NULL)
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128 {
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129 dmError("Format conversion failed for image resource %p '%s' [%d, %d, %d].\n",
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130 file, file->filename, width, height, comp);
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131 }
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132
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133 return result;
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134 }
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