mirror of https://github.com/OpenTTD/OpenTTD.git
147 lines
3.3 KiB
C
147 lines
3.3 KiB
C
/* $Id$ */
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#include "../../stdafx.h"
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#include "../../openttd.h"
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#include "../../variables.h"
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#include "../../macros.h"
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#include "../../debug.h"
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#include "../../functions.h"
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#include "../../gfx.h"
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#include "../../fileio.h"
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#include "splash.h"
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#ifdef WITH_PNG
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#include <png.h>
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static void PNGAPI png_my_error(png_structp png_ptr, png_const_charp message)
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{
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DEBUG(misc, 0) ("ERROR(libpng): %s - %s", message, (char *)png_get_error_ptr(png_ptr));
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longjmp(png_ptr->jmpbuf, 1);
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}
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static void PNGAPI png_my_warning(png_structp png_ptr, png_const_charp message)
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{
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DEBUG(misc, 0) ("WARNING(libpng): %s - %s", message, (char *)png_get_error_ptr(png_ptr));
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}
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void DisplaySplashImage(void)
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{
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png_byte header[8];
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FILE *f;
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png_structp png_ptr;
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png_infop info_ptr, end_info;
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uint width, height, bit_depth, color_type;
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png_colorp palette;
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int num_palette;
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png_bytep *row_pointers;
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uint8 *src, *dst;
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uint y;
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uint xoff, yoff;
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int i;
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f = FioFOpenFile(SPLASH_IMAGE_FILE);
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if (f == NULL) return;
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fread(header, 1, 8, f);
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if (png_sig_cmp(header, 0, 8) != 0) {
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fclose(f);
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return;
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}
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png_ptr = png_create_read_struct (PNG_LIBPNG_VER_STRING, (png_voidp) NULL, png_my_error, png_my_warning);
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if (png_ptr == NULL) {
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fclose(f);
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return;
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}
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info_ptr = png_create_info_struct(png_ptr);
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if (info_ptr == NULL) {
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png_destroy_read_struct(&png_ptr, (png_infopp)NULL, (png_infopp)NULL);
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fclose(f);
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return;
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}
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end_info = png_create_info_struct(png_ptr);
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if (end_info == NULL) {
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png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
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fclose(f);
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return;
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}
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if (setjmp(png_jmpbuf(png_ptr))) {
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png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
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fclose(f);
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return;
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}
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png_init_io(png_ptr, f);
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png_set_sig_bytes(png_ptr, 8);
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png_read_png(png_ptr, info_ptr, PNG_TRANSFORM_IDENTITY, NULL);
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width = png_get_image_width(png_ptr, info_ptr);
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height = png_get_image_height(png_ptr, info_ptr);
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bit_depth = png_get_bit_depth(png_ptr, info_ptr);
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color_type = png_get_color_type(png_ptr, info_ptr);
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if(color_type != PNG_COLOR_TYPE_PALETTE || bit_depth != 8) {
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png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
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fclose(f);
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return;
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}
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if(!png_get_valid(png_ptr, info_ptr, PNG_INFO_PLTE)) {
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png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
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fclose(f);
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return;
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}
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png_get_PLTE(png_ptr, info_ptr, &palette, &num_palette);
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row_pointers = png_get_rows(png_ptr, info_ptr);
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memset(_screen.dst_ptr, 0xff, _screen.pitch * _screen.height);
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if(width > (uint) _screen.width)
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width = _screen.width;
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if(height > (uint) _screen.height)
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height = _screen.height;
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xoff = (_screen.width - width) / 2;
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yoff = (_screen.height - height) / 2;
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for(y = 0; y < height; y++) {
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src = row_pointers[y];
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dst = ((uint8 *) _screen.dst_ptr) + (yoff + y) * _screen.pitch + xoff;
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memcpy(dst, src, width);
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}
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for (i = 0; i < num_palette; i++) {
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_cur_palette[i].r = palette[i].red;
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_cur_palette[i].g = palette[i].green;
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_cur_palette[i].b = palette[i].blue;
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}
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_cur_palette[0xff].r = 0;
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_cur_palette[0xff].g = 0;
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_cur_palette[0xff].b = 0;
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_pal_first_dirty = 0;
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_pal_last_dirty = 0xff;
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png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
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fclose(f);
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return;
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}
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#else // WITH_PNG
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void DisplaySplashImage(void) {}
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#endif // WITH_PNG
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