X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fgraphics%2Fpng%2Fpngloader.cpp;h=1dfa77362d2111d88153003f30155a8ff56edd59;hb=917c43de100807f4397e36b66b1a748dbf44370e;hp=50d58b3e3d9fabef282e1f2bf6574ba228f00998;hpb=7f7f3c7494fe10a91215eaff208465636e9979ab;p=libs%2Fgui.git

diff --git a/source/graphics/png/pngloader.cpp b/source/graphics/png/pngloader.cpp
index 50d58b3..1dfa773 100644
--- a/source/graphics/png/pngloader.cpp
+++ b/source/graphics/png/pngloader.cpp
@@ -29,9 +29,9 @@ struct PngLoader::Private
 	std::string message;
 	png_struct *png;
 	png_info *info;
+	int interlace;
 };
 
-ImageLoader::Register<PngLoader> PngLoader::reg;
 
 PngLoader::PngLoader(IO::Base &io, unsigned sig_bytes):
 	priv(new Private)
@@ -55,17 +55,19 @@ bool PngLoader::detect(const std::string &sig)
 	return !png_sig_cmp(reinterpret_cast<png_byte *>(const_cast<char*>(sig.data())), 0, sig.size());
 }
 
-void PngLoader::load(Image::Data &data)
+void PngLoader::load_headers_(Image::Data &data)
 {
 	if(setjmp(png_jmpbuf(priv->png)))
+	{
 		throw bad_image_data(priv->message);
+	}
 
 	png_read_info(priv->png, priv->info);
 	png_uint_32 width;
 	png_uint_32 height;
 	int depth;
 	int color;
-	png_get_IHDR(priv->png, priv->info, &width, &height, &depth, &color, 0, 0, 0);
+	png_get_IHDR(priv->png, priv->info, &width, &height, &depth, &color, &priv->interlace, 0, 0);
 	unsigned nchans = png_get_channels(priv->png, priv->info);
 
 	if(depth!=8)
@@ -80,17 +82,41 @@ void PngLoader::load(Image::Data &data)
 	case PNG_COLOR_TYPE_PALETTE:    data.fmt = COLOR_INDEX; break;
 	case PNG_COLOR_TYPE_GRAY:       data.fmt = LUMINANCE; break;
 	case PNG_COLOR_TYPE_GRAY_ALPHA: data.fmt = LUMINANCE_ALPHA; break;
-	case PNG_COLOR_TYPE_RGB:        data.fmt = RGB; break;
+	case PNG_COLOR_TYPE_RGB:        data.fmt = (nchans==4 ? RGBX : RGB); break;
 	case PNG_COLOR_TYPE_RGB_ALPHA:  data.fmt = RGBA; break;
 	default: throw unsupported_image_format("unknown color type");
 	}
+}
 
-	if(nchans==4 && data.fmt==RGB)
-		png_set_strip_alpha(priv->png);
+void PngLoader::load_pixels_(Image::Data &data)
+{
+	png_byte **rows = 0;
 
-	data.data = new char[data.stride*data.height];
-	for(unsigned y=0; y<data.height; ++y)
-		png_read_row(priv->png, reinterpret_cast<png_byte *>(data.data+data.stride*(data.height-1-y)), 0);
+	if(setjmp(png_jmpbuf(priv->png)))
+	{
+		delete[] rows;
+		throw bad_image_data(priv->message);
+	}
+
+	if(priv->interlace==PNG_INTERLACE_ADAM7)
+	{
+		// ADAM7 requires all rows to be loaded at once
+		unsigned n_passes = png_set_interlace_handling(priv->png);
+		rows = new png_byte *[data.height];
+		for(unsigned y=0; y<data.height; ++y)
+			rows[y] = reinterpret_cast<png_byte *>(data.pixels+data.stride*(data.height-1-y));
+
+		for(unsigned i=0; i<n_passes; ++i)
+			png_read_rows(priv->png, rows, 0, data.height);
+
+		delete[] rows;
+		rows = 0;
+	}
+	else
+	{
+		for(unsigned y=0; y<data.height; ++y)
+			png_read_row(priv->png, reinterpret_cast<png_byte *>(data.pixels+data.stride*(data.height-1-y)), 0);
+	}
 
 	png_read_end(priv->png, 0);
 }