/* $Id$ */ /** @file grf.cpp */ #ifdef WITH_PNG #include "../stdafx.h" #include "../gfx.h" #include "../fileio.h" #include "../variables.h" #include "../debug.h" #include "png.hpp" #include <png.h> #define PNG_SLOT 62 static void PNGAPI png_my_read(png_structp png_ptr, png_bytep data, png_size_t length) { FioReadBlock(data, length); } static void PNGAPI png_my_error(png_structp png_ptr, png_const_charp message) { DEBUG(sprite, 0, "ERROR (libpng): %s - %s", message, (char *)png_get_error_ptr(png_ptr)); longjmp(png_ptr->jmpbuf, 1); } static void PNGAPI png_my_warning(png_structp png_ptr, png_const_charp message) { DEBUG(sprite, 0, "WARNING (libpng): %s - %s", message, (char *)png_get_error_ptr(png_ptr)); } static bool OpenPNGFile(const char *filename, uint32 id, bool mask) { char png_file[MAX_PATH]; snprintf(png_file, sizeof(png_file), "sprites" PATHSEP "%s" PATHSEP "%d%s.png", filename, id, mask ? "m" : ""); if (FioCheckFileExists(png_file)) { FioOpenFile(PNG_SLOT, png_file); return true; } /* TODO -- Add TAR support */ return false; } static bool LoadPNG(SpriteLoader::Sprite *sprite, const char *filename, uint32 id, bool mask) { png_byte header[8]; png_structp png_ptr; png_infop info_ptr, end_info; uint bit_depth, color_type; uint i, pixelsize; png_bytep row_pointer; SpriteLoader::CommonPixel *dst; if (!OpenPNGFile(filename, id, mask)) return mask; // If mask is true, and file not found, continue true anyway, as it isn't a show-stopper /* Check the header */ FioReadBlock(header, 8); if (png_sig_cmp(header, 0, 8) != 0) return false; /* Create the reader */ png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, (png_voidp)NULL, png_my_error, png_my_warning); if (png_ptr == NULL) return false; /* Create initial stuff */ info_ptr = png_create_info_struct(png_ptr); if (info_ptr == NULL) { png_destroy_read_struct(&png_ptr, (png_infopp)NULL, (png_infopp)NULL); return false; } end_info = png_create_info_struct(png_ptr); if (end_info == NULL) { png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL); return false; } /* Make sure that upon error, we can clean up graceful */ if (setjmp(png_jmpbuf(png_ptr))) { png_destroy_read_struct(&png_ptr, &info_ptr, &end_info); return false; } /* Read the file */ png_set_read_fn(png_ptr, NULL, png_my_read); png_set_sig_bytes(png_ptr, 8); png_read_info(png_ptr, info_ptr); if (!mask) { /* Read the text chunks */ png_textp text_ptr; int num_text = 0; png_get_text(png_ptr, info_ptr, &text_ptr, &num_text); 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); for (int i = 0; i < num_text; i++) { /* x_offs and y_offs are in the text-chunk of PNG */ if (strcmp("x_offs", text_ptr[i].key) == 0) sprite->x_offs = strtol(text_ptr[i].text, NULL, 0); if (strcmp("y_offs", text_ptr[i].key) == 0) sprite->y_offs = strtol(text_ptr[i].text, NULL, 0); } sprite->height = info_ptr->height; sprite->width = info_ptr->width; sprite->data = CallocT<SpriteLoader::CommonPixel>(sprite->width * sprite->height); } bit_depth = png_get_bit_depth(png_ptr, info_ptr); color_type = png_get_color_type(png_ptr, info_ptr); if (mask && (bit_depth != 8 || color_type != PNG_COLOR_TYPE_PALETTE)) { DEBUG(misc, 0, "Ignoring mask for SpriteID %d as it isn't a 8 bit palette image", id); return true; } if (!mask) { if (bit_depth == 16) png_set_strip_16(png_ptr); if (color_type == PNG_COLOR_TYPE_PALETTE) { png_set_palette_to_rgb(png_ptr); color_type = PNG_COLOR_TYPE_RGB; } if (color_type == PNG_COLOR_TYPE_GRAY || color_type == PNG_COLOR_TYPE_GRAY_ALPHA) { png_set_gray_to_rgb(png_ptr); color_type = PNG_COLOR_TYPE_RGB; } #ifdef TTD_LITTLE_ENDIAN png_set_bgr(png_ptr); #else if (color_type == PNG_COLOR_TYPE_RGB_ALPHA) png_set_swap_alpha(png_ptr); #endif if (color_type == PNG_COLOR_TYPE_RGB) { #ifdef TTD_LITTLE_ENDIAN png_set_filler(png_ptr, 0xff, PNG_FILLER_AFTER); #else png_set_filler(png_ptr, 0xff, PNG_FILLER_BEFORE); #endif } pixelsize = sizeof(uint32); } else { pixelsize = sizeof(uint8); } row_pointer = (png_byte *)malloc(info_ptr->width * pixelsize); if (row_pointer == NULL) { png_destroy_read_struct(&png_ptr, &info_ptr, &end_info); return false; } for (i = 0; i < info_ptr->height; i++) { png_read_row(png_ptr, row_pointer, NULL); dst = sprite->data + i * info_ptr->width; for (uint x = 0; x < info_ptr->width; x++) { if (mask) { if (row_pointer[x * sizeof(uint8)] != 0) { dst[x].b = 0; dst[x].g = 0; dst[x].r = 0; /* Alpha channel is used from the original image (to allow transparency in remap colors) */ dst[x].m = row_pointer[x * sizeof(uint8)]; } } else { dst[x].b = row_pointer[x * sizeof(uint32) + 0]; dst[x].g = row_pointer[x * sizeof(uint32) + 1]; dst[x].r = row_pointer[x * sizeof(uint32) + 2]; dst[x].a = row_pointer[x * sizeof(uint32) + 3]; dst[x].m = 0; } } } free(row_pointer); png_destroy_read_struct(&png_ptr, &info_ptr, &end_info); return true; } bool SpriteLoaderPNG::LoadSprite(SpriteLoader::Sprite *sprite, const char *filename, uint32 file_pos) { if (!LoadPNG(sprite, filename, file_pos, false)) return false; if (!LoadPNG(sprite, filename, file_pos, true)) return false; return true; } #endif /* WITH_PNG */