our current experimental Neutrino branch

git-svn-id: file:///home/bas/coolstream_public_svn/THIRDPARTY/applications/neutrino-experimental@27 e54a6e83-5905-42d5-8d5c-058d10e6a962


Origin commit data
------------------
Commit: bc5bd4154e
Author: mrcolor <mrcolor@e54a6e83-5905-42d5-8d5c-058d10e6a962>
Date: 2009-12-08 (Tue, 08 Dec 2009)

src/driver/pictureviewer/png.cpp

@@ -0,0 +1,158 @@
+#include "config.h"
+
+#ifdef FBV_SUPPORT_PNG
+	#include <png.h>
+	#include <sys/types.h>
+	#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+	#include "pictureviewer.h"
+
+	#define PNG_BYTES_TO_CHECK 4
+	#define min(x,y) ((x) < (y) ? (x) : (y))
+
+int fh_png_id(const char *name)
+{
+	int fd;
+	char id[4];
+	fd=open(name,O_RDONLY); if(fd==-1) return(0);
+	read(fd,id,4);
+	close(fd);
+	if(id[1]=='P' && id[2]=='N' && id[3]=='G') return(1);
+	return(0);
+}
+
+
+int fh_png_load(const char *name,unsigned char **buffer,int* xp,int* yp)
+{
+	static const png_color_16 my_background = {0, 0, 0, 0, 0};
+
+	png_structp png_ptr;
+	png_infop info_ptr;
+	png_uint_32 width, height;
+	unsigned int i;
+	int bit_depth, color_type, interlace_type;
+	int number_passes,pass;
+	png_byte * fbptr;
+	FILE     * fh;
+
+	if(!(fh=fopen(name,"rb")))	return(FH_ERROR_FILE);
+
+	png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,NULL,NULL,NULL);
+	if(png_ptr == NULL) {
+		fclose(fh);
+		return(FH_ERROR_FORMAT);
+	}
+	info_ptr = png_create_info_struct(png_ptr);
+	if(info_ptr == NULL)
+	{
+		png_destroy_read_struct(&png_ptr, (png_infopp)NULL, (png_infopp)NULL);
+		fclose(fh); 
+		return(FH_ERROR_FORMAT);
+	}
+
+	if(setjmp(png_ptr->jmpbuf))
+	{
+		png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
+		fclose(fh); 
+		return(FH_ERROR_FORMAT);
+	}
+
+	png_init_io(png_ptr,fh);
+
+	png_read_info(png_ptr, info_ptr);
+	png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,&interlace_type, NULL, NULL);
+
+	if (color_type == PNG_COLOR_TYPE_PALETTE)
+	{
+		png_set_palette_to_rgb(png_ptr);
+		png_set_background(png_ptr, (png_color_16*)&my_background, PNG_BACKGROUND_GAMMA_SCREEN, 0, 1.0);
+		/* other possibility for png_set_background: use png_get_bKGD */
+	}
+
+	if (color_type == PNG_COLOR_TYPE_GRAY        ||
+			color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
+	{
+		png_set_gray_to_rgb(png_ptr);
+		png_set_background(png_ptr, (png_color_16*)&my_background, PNG_BACKGROUND_GAMMA_SCREEN, 0, 1.0);
+	}
+
+	if (color_type & PNG_COLOR_MASK_ALPHA)
+		png_set_strip_alpha(png_ptr);
+
+	if (bit_depth < 8)
+		png_set_packing(png_ptr);
+
+	if (bit_depth == 16)
+		png_set_strip_16(png_ptr);
+
+	/* on Intel PC ?:
+	   if (bit_depth == 16)
+	   png_set_swap(png_ptr);
+	   */
+
+	number_passes = png_set_interlace_handling(png_ptr);
+	png_read_update_info(png_ptr,info_ptr);
+
+	if (width * 3 != png_get_rowbytes(png_ptr, info_ptr))
+	{
+		printf("[png.cpp]: Error processing %s - please report (including image).\n", name);
+		fclose(fh);
+		return(FH_ERROR_FORMAT);
+	}
+
+	for(pass = 0; pass < number_passes; pass++)
+	{
+		fbptr = (png_byte *)(*buffer);
+		for (i = 0; i < height; i++, fbptr += width * 3)
+		{
+			png_read_row(png_ptr, fbptr, NULL);
+		}
+	}
+	png_read_end(png_ptr, info_ptr);
+	png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
+	fclose(fh);
+	return(FH_ERROR_OK);
+}
+
+int fh_png_getsize(const char *name,int *x,int *y, int wanted_width, int wanted_height)
+{
+	png_structp png_ptr;
+	png_infop info_ptr;
+	png_uint_32 width, height;
+	int bit_depth, color_type, interlace_type;
+	FILE *fh;
+
+	if(!(fh=fopen(name,"rb")))	return(FH_ERROR_FILE);
+
+	png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,NULL,NULL,NULL);
+	if(png_ptr == NULL) {
+		fclose(fh);
+		return(FH_ERROR_FORMAT);
+	}
+	info_ptr = png_create_info_struct(png_ptr);
+	if(info_ptr == NULL)
+	{
+		png_destroy_read_struct(&png_ptr, (png_infopp)NULL, (png_infopp)NULL);
+		fclose(fh); 
+		return(FH_ERROR_FORMAT);
+	}
+
+	if(setjmp(png_ptr->jmpbuf))
+	{
+		png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
+		fclose(fh); 
+		return(FH_ERROR_FORMAT);
+	}
+
+	png_init_io(png_ptr,fh);
+	png_read_info(png_ptr, info_ptr);
+	png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,&interlace_type, NULL, NULL);
+	png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
+	*x=width;
+	*y=height;
+	fclose(fh);
+	return(FH_ERROR_OK);
+}
+#endif