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123 lines
3.4 KiB
C++
123 lines
3.4 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsPNGDecoder_h__
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#define nsPNGDecoder_h__
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#include "Decoder.h"
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#include "imgIDecoderObserver.h"
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#include "gfxASurface.h"
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#include "nsCOMPtr.h"
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#include "png.h"
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#include "qcms.h"
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namespace mozilla {
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namespace image {
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class RasterImage;
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class nsPNGDecoder : public Decoder
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{
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public:
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nsPNGDecoder(RasterImage &aImage, imgIDecoderObserver* aObserver);
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virtual ~nsPNGDecoder();
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virtual void InitInternal();
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virtual void WriteInternal(const char* aBuffer, PRUint32 aCount);
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virtual Telemetry::ID SpeedHistogram();
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void CreateFrame(png_uint_32 x_offset, png_uint_32 y_offset,
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PRInt32 width, PRInt32 height,
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gfxASurface::gfxImageFormat format);
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void SetAnimFrameInfo();
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void EndImageFrame();
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// Check if PNG is valid ICO (32bpp RGBA)
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// http://blogs.msdn.com/b/oldnewthing/archive/2010/10/22/10079192.aspx
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bool IsValidICO() const
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{
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// If there are errors in the call to png_get_IHDR, the error_callback in
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// nsPNGDecoder.cpp is called. In this error callback we do a longjmp, so
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// we need to save the jump buffer here. Oterwise we'll end up without a
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// proper callstack.
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if (setjmp(png_jmpbuf(mPNG))) {
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// We got here from a longjmp call indirectly from png_get_IHDR
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return false;
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}
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png_uint_32
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png_width, // Unused
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png_height; // Unused
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int png_bit_depth,
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png_color_type;
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if (png_get_IHDR(mPNG, mInfo, &png_width, &png_height, &png_bit_depth,
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&png_color_type, NULL, NULL, NULL)) {
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return (png_color_type == PNG_COLOR_TYPE_RGB_ALPHA &&
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png_bit_depth == 8);
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} else {
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return false;
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}
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}
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public:
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png_structp mPNG;
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png_infop mInfo;
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nsIntRect mFrameRect;
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PRUint8 *mCMSLine;
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PRUint8 *interlacebuf;
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PRUint8 *mImageData;
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qcms_profile *mInProfile;
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qcms_transform *mTransform;
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gfxASurface::gfxImageFormat format;
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// For size decodes
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PRUint8 *mHeaderBuf;
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PRUint32 mHeaderBytesRead;
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PRUint8 mChannels;
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bool mFrameHasNoAlpha;
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bool mFrameIsHidden;
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// whether CMS or premultiplied alpha are forced off
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PRUint32 mCMSMode;
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bool mDisablePremultipliedAlpha;
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/*
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* libpng callbacks
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*
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* We put these in the class so that they can access protected members.
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*/
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static void PNGAPI info_callback(png_structp png_ptr, png_infop info_ptr);
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static void PNGAPI row_callback(png_structp png_ptr, png_bytep new_row,
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png_uint_32 row_num, int pass);
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#ifdef PNG_APNG_SUPPORTED
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static void PNGAPI frame_info_callback(png_structp png_ptr,
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png_uint_32 frame_num);
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#endif
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static void PNGAPI end_callback(png_structp png_ptr, png_infop info_ptr);
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static void PNGAPI error_callback(png_structp png_ptr,
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png_const_charp error_msg);
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static void PNGAPI warning_callback(png_structp png_ptr,
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png_const_charp warning_msg);
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// This is defined in the PNG spec as an invariant. We use it to
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// do manual validation without libpng.
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static const PRUint8 pngSignatureBytes[];
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};
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} // namespace image
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} // namespace mozilla
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#endif // nsPNGDecoder_h__
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