1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/image/decoders/nsPNGDecoder.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,136 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
1.5 + *
1.6 + * This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#ifndef nsPNGDecoder_h__
1.11 +#define nsPNGDecoder_h__
1.12 +
1.13 +#include "Decoder.h"
1.14 +
1.15 +#include "gfxTypes.h"
1.16 +
1.17 +#include "nsCOMPtr.h"
1.18 +
1.19 +#include "png.h"
1.20 +
1.21 +#include "qcms.h"
1.22 +
1.23 +namespace mozilla {
1.24 +namespace image {
1.25 +class RasterImage;
1.26 +
1.27 +class nsPNGDecoder : public Decoder
1.28 +{
1.29 +public:
1.30 + nsPNGDecoder(RasterImage &aImage);
1.31 + virtual ~nsPNGDecoder();
1.32 +
1.33 + virtual void InitInternal();
1.34 + virtual void WriteInternal(const char* aBuffer, uint32_t aCount, DecodeStrategy aStrategy);
1.35 + virtual Telemetry::ID SpeedHistogram();
1.36 +
1.37 + void CreateFrame(png_uint_32 x_offset, png_uint_32 y_offset,
1.38 + int32_t width, int32_t height,
1.39 + gfxImageFormat format);
1.40 + void EndImageFrame();
1.41 +
1.42 + // Check if PNG is valid ICO (32bpp RGBA)
1.43 + // http://blogs.msdn.com/b/oldnewthing/archive/2010/10/22/10079192.aspx
1.44 + bool IsValidICO() const
1.45 + {
1.46 + // If there are errors in the call to png_get_IHDR, the error_callback in
1.47 + // nsPNGDecoder.cpp is called. In this error callback we do a longjmp, so
1.48 + // we need to save the jump buffer here. Oterwise we'll end up without a
1.49 + // proper callstack.
1.50 + if (setjmp(png_jmpbuf(mPNG))) {
1.51 + // We got here from a longjmp call indirectly from png_get_IHDR
1.52 + return false;
1.53 + }
1.54 +
1.55 + png_uint_32
1.56 + png_width, // Unused
1.57 + png_height; // Unused
1.58 +
1.59 + int png_bit_depth,
1.60 + png_color_type;
1.61 +
1.62 + if (png_get_IHDR(mPNG, mInfo, &png_width, &png_height, &png_bit_depth,
1.63 + &png_color_type, nullptr, nullptr, nullptr)) {
1.64 +
1.65 + return ((png_color_type == PNG_COLOR_TYPE_RGB_ALPHA ||
1.66 + png_color_type == PNG_COLOR_TYPE_RGB) &&
1.67 + png_bit_depth == 8);
1.68 + } else {
1.69 + return false;
1.70 + }
1.71 + }
1.72 +
1.73 +public:
1.74 + png_structp mPNG;
1.75 + png_infop mInfo;
1.76 + nsIntRect mFrameRect;
1.77 + uint8_t *mCMSLine;
1.78 + uint8_t *interlacebuf;
1.79 + qcms_profile *mInProfile;
1.80 + qcms_transform *mTransform;
1.81 +
1.82 + gfxImageFormat format;
1.83 +
1.84 + // For size decodes
1.85 + uint8_t mSizeBytes[8]; // Space for width and height, both 4 bytes
1.86 + uint32_t mHeaderBytesRead;
1.87 +
1.88 + // whether CMS or premultiplied alpha are forced off
1.89 + uint32_t mCMSMode;
1.90 +
1.91 + uint8_t mChannels;
1.92 + bool mFrameHasNoAlpha;
1.93 + bool mFrameIsHidden;
1.94 + bool mDisablePremultipliedAlpha;
1.95 +
1.96 + struct AnimFrameInfo
1.97 + {
1.98 + AnimFrameInfo();
1.99 +#ifdef PNG_APNG_SUPPORTED
1.100 + AnimFrameInfo(png_structp aPNG, png_infop aInfo);
1.101 +#endif
1.102 +
1.103 + FrameBlender::FrameDisposalMethod mDispose;
1.104 + FrameBlender::FrameBlendMethod mBlend;
1.105 + int32_t mTimeout;
1.106 + };
1.107 +
1.108 + AnimFrameInfo mAnimInfo;
1.109 +
1.110 + // The number of frames we've finished.
1.111 + uint32_t mNumFrames;
1.112 +
1.113 + /*
1.114 + * libpng callbacks
1.115 + *
1.116 + * We put these in the class so that they can access protected members.
1.117 + */
1.118 + static void PNGAPI info_callback(png_structp png_ptr, png_infop info_ptr);
1.119 + static void PNGAPI row_callback(png_structp png_ptr, png_bytep new_row,
1.120 + png_uint_32 row_num, int pass);
1.121 +#ifdef PNG_APNG_SUPPORTED
1.122 + static void PNGAPI frame_info_callback(png_structp png_ptr,
1.123 + png_uint_32 frame_num);
1.124 +#endif
1.125 + static void PNGAPI end_callback(png_structp png_ptr, png_infop info_ptr);
1.126 + static void PNGAPI error_callback(png_structp png_ptr,
1.127 + png_const_charp error_msg);
1.128 + static void PNGAPI warning_callback(png_structp png_ptr,
1.129 + png_const_charp warning_msg);
1.130 +
1.131 + // This is defined in the PNG spec as an invariant. We use it to
1.132 + // do manual validation without libpng.
1.133 + static const uint8_t pngSignatureBytes[];
1.134 +};
1.135 +
1.136 +} // namespace image
1.137 +} // namespace mozilla
1.138 +
1.139 +#endif // nsPNGDecoder_h__
