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/* $Id$ */

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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, "[libpng] error: %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, 1, "[libpng] warning: %s - %s", message, (char *)png_get_error_ptr(png_ptr));

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}

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void DisplaySplashImage()

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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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	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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	if (width > (uint) _screen.width) width = _screen.width;

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	if (height > (uint) _screen.height) 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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	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() {}

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#endif /* WITH_PNG */