-Image* LoadPNGBuff (unsigned char* fbuffer)
-{
- png_byte** row_pointers;
- png_bytep p_fbuffer;
-
- p_fbuffer = fbuffer;
-
- // the reading glue
- // http://www.libpng.org/pub/png/libpng-manual.html
-
- png_structp png_ptr = png_create_read_struct
- (PNG_LIBPNG_VER_STRING, (png_voidp)NULL,
- user_error_fn, user_warning_fn);
- if (!png_ptr)
- {
- globalErrorStream() << "libpng error: png_create_read_struct\n";
- return 0;
- }
-
- png_infop info_ptr = png_create_info_struct(png_ptr);
- if (!info_ptr) {
- png_destroy_read_struct(&png_ptr,
- (png_infopp)NULL, (png_infopp)NULL);
- globalErrorStream() << "libpng error: png_create_info_struct (info_ptr)\n";
- return 0;
- }
-
- png_infop end_info = png_create_info_struct(png_ptr);
- if (!end_info) {
- png_destroy_read_struct(&png_ptr, &info_ptr,
- (png_infopp)NULL);
- globalErrorStream() << "libpng error: png_create_info_struct (end_info)\n";
- return 0;
- }
-
- // configure the read function
- png_set_read_fn(png_ptr, (png_voidp)&p_fbuffer, (png_rw_ptr)&user_read_data);
-
- if (setjmp(png_jmpbuf(png_ptr))) {
- png_destroy_read_struct(&png_ptr, &info_ptr,
- &end_info);
- return 0;
- }
-
- png_read_info(png_ptr, info_ptr);
-
- int bit_depth = png_get_bit_depth(png_ptr, info_ptr);
- int color_type = png_get_color_type(png_ptr, info_ptr);
-
- // we want to treat all images the same way
- // The following code transforms grayscale images of less than 8 to 8 bits,
- // changes paletted images to RGB, and adds a full alpha channel if there is
- // transparency information in a tRNS chunk.
-
- if (color_type == PNG_COLOR_TYPE_GRAY || color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
- png_set_gray_to_rgb(png_ptr);
- else if (color_type == PNG_COLOR_TYPE_PALETTE)
- png_set_palette_to_rgb(png_ptr);
-
- if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
- png_set_expand_gray_1_2_4_to_8(png_ptr);
-
- if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
- png_set_tRNS_to_alpha(png_ptr);
-
- if ( ! ( color_type & PNG_COLOR_MASK_ALPHA ) ) {
- // Set the background color to draw transparent and alpha images over.
- png_color_16 my_background, *image_background;
-
- if (png_get_bKGD(png_ptr, info_ptr, &image_background))
- png_set_background(png_ptr, image_background,
- PNG_BACKGROUND_GAMMA_FILE, 1, 1.0);
- else
- png_set_background(png_ptr, &my_background,
- PNG_BACKGROUND_GAMMA_SCREEN, 0, 1.0);
-
- // Add alpha byte after each RGB triplet
- png_set_filler(png_ptr, 0xff, PNG_FILLER_AFTER);
- }
-
- // read the sucker in one chunk
- png_read_update_info(png_ptr, info_ptr);
-
- color_type = png_get_color_type(png_ptr, info_ptr);
- bit_depth = png_get_bit_depth(png_ptr, info_ptr);
-
- int width = png_get_image_width(png_ptr, info_ptr);
- int height = png_get_image_height(png_ptr, info_ptr);
-
- // allocate the pixel buffer, and the row pointers
- RGBAImage* image = new RGBAImage(width, height);
-
- row_pointers = (png_byte**) malloc((height) * sizeof(png_byte*));
-
- int i;
- for(i = 0; i < (height); i++)
- row_pointers[i] = (png_byte*)(image->getRGBAPixels()) + i * 4 * (width);
-
- // actual read
- png_read_image(png_ptr, row_pointers);
-
- /* read rest of file, and get additional chunks in info_ptr - REQUIRED */
- png_read_end(png_ptr, info_ptr);
-
- /* free up the memory structure */
- png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
-
- free(row_pointers);
-
- return image;
+Image* LoadPNGBuff( unsigned char* fbuffer ){
+ png_byte** row_pointers;
+ png_bytep p_fbuffer;
+
+ p_fbuffer = fbuffer;
+
+ // the reading glue
+ // http://www.libpng.org/pub/png/libpng-manual.html
+
+ png_structp png_ptr = png_create_read_struct
+ ( PNG_LIBPNG_VER_STRING, (png_voidp)NULL,
+ user_error_fn, user_warning_fn );
+ if ( !png_ptr ) {
+ globalErrorStream() << "libpng error: png_create_read_struct\n";
+ return 0;
+ }
+
+ png_infop info_ptr = png_create_info_struct( png_ptr );
+ if ( !info_ptr ) {
+ png_destroy_read_struct( &png_ptr,
+ (png_infopp)NULL, (png_infopp)NULL );
+ globalErrorStream() << "libpng error: png_create_info_struct (info_ptr)\n";
+ return 0;
+ }
+
+ png_infop end_info = png_create_info_struct( png_ptr );
+ if ( !end_info ) {
+ png_destroy_read_struct( &png_ptr, &info_ptr,
+ (png_infopp)NULL );
+ globalErrorStream() << "libpng error: png_create_info_struct (end_info)\n";
+ return 0;
+ }
+
+ // configure the read function
+ png_set_read_fn( png_ptr, ( png_voidp ) & p_fbuffer, ( png_rw_ptr ) & user_read_data );
+
+ if ( setjmp( png_jmpbuf( png_ptr ) ) ) {
+ png_destroy_read_struct( &png_ptr, &info_ptr,
+ &end_info );
+ return 0;
+ }
+
+ png_read_info( png_ptr, info_ptr );
+
+ int bit_depth = png_get_bit_depth( png_ptr, info_ptr );
+ int color_type = png_get_color_type( png_ptr, info_ptr );
+
+ // we want to treat all images the same way
+ // The following code transforms grayscale images of less than 8 to 8 bits,
+ // changes paletted images to RGB, and adds a full alpha channel if there is
+ // transparency information in a tRNS chunk.
+
+ if ( color_type == PNG_COLOR_TYPE_GRAY || color_type == PNG_COLOR_TYPE_GRAY_ALPHA ) {
+ png_set_gray_to_rgb( png_ptr );
+ }
+ else if ( color_type == PNG_COLOR_TYPE_PALETTE ) {
+ png_set_palette_to_rgb( png_ptr );
+ }
+
+ if ( color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8 ) {
+ png_set_expand_gray_1_2_4_to_8( png_ptr );
+ }
+
+ if ( png_get_valid( png_ptr, info_ptr, PNG_INFO_tRNS ) ) {
+ png_set_tRNS_to_alpha( png_ptr );
+ }
+
+ if ( !( color_type & PNG_COLOR_MASK_ALPHA ) ) {
+ // Set the background color to draw transparent and alpha images over.
+ png_color_16 my_background, *image_background;
+
+ if ( png_get_bKGD( png_ptr, info_ptr, &image_background ) ) {
+ png_set_background( png_ptr, image_background,
+ PNG_BACKGROUND_GAMMA_FILE, 1, 1.0 );
+ }
+ else{
+ png_set_background( png_ptr, &my_background,
+ PNG_BACKGROUND_GAMMA_SCREEN, 0, 1.0 );
+ }
+
+ // Add alpha byte after each RGB triplet
+ png_set_filler( png_ptr, 0xff, PNG_FILLER_AFTER );
+ }
+
+ // read the sucker in one chunk
+ png_read_update_info( png_ptr, info_ptr );
+
+ color_type = png_get_color_type( png_ptr, info_ptr );
+ bit_depth = png_get_bit_depth( png_ptr, info_ptr );
+
+ int width = png_get_image_width( png_ptr, info_ptr );
+ int height = png_get_image_height( png_ptr, info_ptr );
+
+ // allocate the pixel buffer, and the row pointers
+ RGBAImage* image = new RGBAImage( width, height );
+
+ row_pointers = (png_byte**) malloc( ( height ) * sizeof( png_byte* ) );
+
+ int i;
+ for ( i = 0; i < ( height ); i++ )
+ row_pointers[i] = (png_byte*)( image->getRGBAPixels() ) + i * 4 * ( width );
+
+ // actual read
+ png_read_image( png_ptr, row_pointers );
+
+ /* read rest of file, and get additional chunks in info_ptr - REQUIRED */
+ png_read_end( png_ptr, info_ptr );
+
+ /* free up the memory structure */
+ png_destroy_read_struct( &png_ptr, &info_ptr, NULL );
+
+ free( row_pointers );
+
+ return image;