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00012 #ifdef WITH_PNG
00013
00014 #include "../stdafx.h"
00015 #include "../fileio_func.h"
00016 #include "../debug.h"
00017 #include "png.hpp"
00018 #include <png.h>
00019
00020 #define PNG_SLOT 62
00021
00022 static void PNGAPI png_my_read(png_structp png_ptr, png_bytep data, png_size_t length)
00023 {
00024 FioReadBlock(data, length);
00025 }
00026
00027 static void PNGAPI png_my_error(png_structp png_ptr, png_const_charp message)
00028 {
00029 DEBUG(sprite, 0, "ERROR (libpng): %s - %s", message, (char *)png_get_error_ptr(png_ptr));
00030 longjmp(png_jmpbuf(png_ptr), 1);
00031 }
00032
00033 static void PNGAPI png_my_warning(png_structp png_ptr, png_const_charp message)
00034 {
00035 DEBUG(sprite, 0, "WARNING (libpng): %s - %s", message, (char *)png_get_error_ptr(png_ptr));
00036 }
00037
00038 static bool OpenPNGFile(const char *filename, uint32 id, bool mask)
00039 {
00040 char png_file[MAX_PATH];
00041
00042
00043 const char *sep = (filename[0] == PATHSEPCHAR) ? "" : PATHSEP;
00044 snprintf(png_file, sizeof(png_file), "sprites%s%s" PATHSEP "%d%s.png", sep, filename, id, mask ? "m" : "");
00045 if (FioCheckFileExists(png_file)) {
00046 FioOpenFile(PNG_SLOT, png_file);
00047 return true;
00048 }
00049
00050
00051 return false;
00052 }
00053
00054 static bool LoadPNG(SpriteLoader::Sprite *sprite, const char *filename, uint32 id, volatile bool mask)
00055 {
00056 png_byte header[8];
00057 png_structp png_ptr;
00058 png_infop info_ptr, end_info;
00059 uint bit_depth, colour_type;
00060 uint i, pixelsize;
00061 SpriteLoader::CommonPixel *dst;
00062
00063 if (!OpenPNGFile(filename, id, mask)) return mask;
00064
00065
00066 FioReadBlock(header, 8);
00067 if (png_sig_cmp(header, 0, 8) != 0) return false;
00068
00069
00070 png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, (png_voidp)NULL, png_my_error, png_my_warning);
00071 if (png_ptr == NULL) return false;
00072
00073
00074 info_ptr = png_create_info_struct(png_ptr);
00075 if (info_ptr == NULL) {
00076 png_destroy_read_struct(&png_ptr, (png_infopp)NULL, (png_infopp)NULL);
00077 return false;
00078 }
00079 end_info = png_create_info_struct(png_ptr);
00080 if (end_info == NULL) {
00081 png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
00082 return false;
00083 }
00084
00085
00086 if (setjmp(png_jmpbuf(png_ptr))) {
00087 png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
00088 return false;
00089 }
00090
00091
00092 png_set_read_fn(png_ptr, NULL, png_my_read);
00093 png_set_sig_bytes(png_ptr, 8);
00094
00095 png_read_info(png_ptr, info_ptr);
00096
00097 if (!mask) {
00098
00099 png_textp text_ptr;
00100 int num_text = 0;
00101 png_get_text(png_ptr, info_ptr, &text_ptr, &num_text);
00102 if (num_text == 0) DEBUG(misc, 0, "Warning: PNG Sprite '%s/%d.png' doesn't have x_offs and y_offs; expect graphical problems", filename, id);
00103 for (int i = 0; i < num_text; i++) {
00104
00105 if (strcmp("x_offs", text_ptr[i].key) == 0) sprite->x_offs = strtol(text_ptr[i].text, NULL, 0);
00106 if (strcmp("y_offs", text_ptr[i].key) == 0) sprite->y_offs = strtol(text_ptr[i].text, NULL, 0);
00107 }
00108
00109 uint height = png_get_image_height(png_ptr, info_ptr);
00110 uint width = png_get_image_width(png_ptr, info_ptr);
00111
00112 if (height > UINT8_MAX || width > UINT16_MAX) {
00113 png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
00114 return false;
00115 }
00116 sprite->height = height;
00117 sprite->width = width;
00118 sprite->AllocateData(sprite->width * sprite->height);
00119 } else if (sprite->height != png_get_image_height(png_ptr, info_ptr) || sprite->width != png_get_image_width(png_ptr, info_ptr)) {
00120
00121 DEBUG(misc, 0, "Ignoring mask for SpriteID %d as it isn't the same dimension as the masked sprite", id);
00122 png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
00123 return true;
00124 }
00125
00126 bit_depth = png_get_bit_depth(png_ptr, info_ptr);
00127 colour_type = png_get_color_type(png_ptr, info_ptr);
00128
00129 if (mask && (bit_depth != 8 || colour_type != PNG_COLOR_TYPE_PALETTE)) {
00130 DEBUG(misc, 0, "Ignoring mask for SpriteID %d as it isn't a 8 bit palette image", id);
00131 png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
00132 return true;
00133 }
00134
00135 if (!mask) {
00136 if (bit_depth == 16) png_set_strip_16(png_ptr);
00137
00138 if (colour_type == PNG_COLOR_TYPE_PALETTE) {
00139 png_set_palette_to_rgb(png_ptr);
00140 colour_type = PNG_COLOR_TYPE_RGB;
00141 }
00142 if (colour_type == PNG_COLOR_TYPE_GRAY || colour_type == PNG_COLOR_TYPE_GRAY_ALPHA) {
00143 png_set_gray_to_rgb(png_ptr);
00144 colour_type = PNG_COLOR_TYPE_RGB;
00145 }
00146
00147 if (colour_type == PNG_COLOR_TYPE_RGB) {
00148 if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)) {
00149
00150 png_set_tRNS_to_alpha(png_ptr);
00151 } else {
00152 png_set_filler(png_ptr, 0xff, PNG_FILLER_AFTER);
00153 }
00154 }
00155
00156 pixelsize = sizeof(uint32);
00157 } else {
00158 pixelsize = sizeof(uint8);
00159 }
00160
00161 png_bytep row_pointer = AllocaM(png_byte, png_get_image_width(png_ptr, info_ptr) * pixelsize);
00162
00163 for (i = 0; i < png_get_image_height(png_ptr, info_ptr); i++) {
00164 png_read_row(png_ptr, row_pointer, NULL);
00165
00166 dst = sprite->data + i * png_get_image_width(png_ptr, info_ptr);
00167
00168 for (uint x = 0; x < png_get_image_width(png_ptr, info_ptr); x++) {
00169 if (mask) {
00170 if (row_pointer[x * sizeof(uint8)] != 0) {
00171 dst[x].r = 0;
00172 dst[x].g = 0;
00173 dst[x].b = 0;
00174
00175 dst[x].m = row_pointer[x * sizeof(uint8)];
00176 }
00177 } else {
00178 dst[x].r = row_pointer[x * sizeof(uint32) + 0];
00179 dst[x].g = row_pointer[x * sizeof(uint32) + 1];
00180 dst[x].b = row_pointer[x * sizeof(uint32) + 2];
00181 dst[x].a = row_pointer[x * sizeof(uint32) + 3];
00182 dst[x].m = 0;
00183 }
00184 }
00185 }
00186
00187 png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
00188
00189 return true;
00190 }
00191
00192 bool SpriteLoaderPNG::LoadSprite(SpriteLoader::Sprite *sprite, uint8 file_slot, size_t file_pos, SpriteType sprite_type)
00193 {
00194 const char *filename = FioGetFilename(file_slot);
00195 if (!LoadPNG(sprite, filename, (uint32)file_pos, false)) return false;
00196 if (!LoadPNG(sprite, filename, (uint32)file_pos, true)) return false;
00197 return true;
00198 }
00199
00200 #endif