785 lines
22 KiB
C++
785 lines
22 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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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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#include "ImageLogging.h"
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#include "nsCRT.h"
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#include "nsPNGEncoder.h"
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#include "nsStreamUtils.h"
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#include "nsString.h"
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#include "prprf.h"
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#include "mozilla/CheckedInt.h"
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using namespace mozilla;
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static LazyLogModule sPNGEncoderLog("PNGEncoder");
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NS_IMPL_ISUPPORTS(nsPNGEncoder, imgIEncoder, nsIInputStream,
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nsIAsyncInputStream)
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nsPNGEncoder::nsPNGEncoder() : mPNG(nullptr), mPNGinfo(nullptr),
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mIsAnimation(false),
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mFinished(false),
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mImageBuffer(nullptr), mImageBufferSize(0),
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mImageBufferUsed(0), mImageBufferReadPoint(0),
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mCallback(nullptr),
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mCallbackTarget(nullptr), mNotifyThreshold(0),
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mReentrantMonitor(
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"nsPNGEncoder.mReentrantMonitor")
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{ }
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nsPNGEncoder::~nsPNGEncoder()
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{
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if (mImageBuffer) {
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free(mImageBuffer);
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mImageBuffer = nullptr;
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}
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// don't leak if EndImageEncode wasn't called
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if (mPNG) {
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png_destroy_write_struct(&mPNG, &mPNGinfo);
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}
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}
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// nsPNGEncoder::InitFromData
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//
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// One output option is supported: "transparency=none" means that the
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// output PNG will not have an alpha channel, even if the input does.
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//
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// Based partially on gfx/cairo/cairo/src/cairo-png.c
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// See also media/libpng/libpng-manual.txt
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NS_IMETHODIMP
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nsPNGEncoder::InitFromData(const uint8_t* aData,
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uint32_t aLength, // (unused, req'd by JS)
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uint32_t aWidth,
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uint32_t aHeight,
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uint32_t aStride,
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uint32_t aInputFormat,
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const nsAString& aOutputOptions)
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{
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NS_ENSURE_ARG(aData);
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nsresult rv;
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rv = StartImageEncode(aWidth, aHeight, aInputFormat, aOutputOptions);
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if (!NS_SUCCEEDED(rv)) {
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return rv;
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}
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rv = AddImageFrame(aData, aLength, aWidth, aHeight, aStride,
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aInputFormat, aOutputOptions);
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if (!NS_SUCCEEDED(rv)) {
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return rv;
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}
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rv = EndImageEncode();
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return rv;
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}
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// nsPNGEncoder::StartImageEncode
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//
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//
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// See ::InitFromData for other info.
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NS_IMETHODIMP
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nsPNGEncoder::StartImageEncode(uint32_t aWidth,
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uint32_t aHeight,
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uint32_t aInputFormat,
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const nsAString& aOutputOptions)
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{
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bool useTransparency = true, skipFirstFrame = false;
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uint32_t numFrames = 1;
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uint32_t numPlays = 0; // For animations, 0 == forever
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// can't initialize more than once
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if (mImageBuffer != nullptr) {
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return NS_ERROR_ALREADY_INITIALIZED;
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}
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// validate input format
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if (aInputFormat != INPUT_FORMAT_RGB &&
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aInputFormat != INPUT_FORMAT_RGBA &&
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aInputFormat != INPUT_FORMAT_HOSTARGB)
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return NS_ERROR_INVALID_ARG;
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// parse and check any provided output options
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nsresult rv = ParseOptions(aOutputOptions, &useTransparency, &skipFirstFrame,
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&numFrames, &numPlays, nullptr, nullptr,
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nullptr, nullptr, nullptr);
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if (rv != NS_OK) {
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return rv;
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}
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#ifdef PNG_APNG_SUPPORTED
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if (numFrames > 1) {
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mIsAnimation = true;
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}
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#endif
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// initialize
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mPNG = png_create_write_struct(PNG_LIBPNG_VER_STRING,
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nullptr,
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ErrorCallback,
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WarningCallback);
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if (!mPNG) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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mPNGinfo = png_create_info_struct(mPNG);
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if (!mPNGinfo) {
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png_destroy_write_struct(&mPNG, nullptr);
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return NS_ERROR_FAILURE;
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}
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// libpng's error handler jumps back here upon an error.
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// Note: It's important that all png_* callers do this, or errors
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// will result in a corrupt time-warped stack.
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if (setjmp(png_jmpbuf(mPNG))) {
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png_destroy_write_struct(&mPNG, &mPNGinfo);
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return NS_ERROR_FAILURE;
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}
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// Set up to read the data into our image buffer, start out with an 8K
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// estimated size. Note: we don't have to worry about freeing this data
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// in this function. It will be freed on object destruction.
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mImageBufferSize = 8192;
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mImageBuffer = (uint8_t*)malloc(mImageBufferSize);
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if (!mImageBuffer) {
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png_destroy_write_struct(&mPNG, &mPNGinfo);
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return NS_ERROR_OUT_OF_MEMORY;
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}
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mImageBufferUsed = 0;
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// set our callback for libpng to give us the data
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png_set_write_fn(mPNG, this, WriteCallback, nullptr);
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// include alpha?
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int colorType;
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if ((aInputFormat == INPUT_FORMAT_HOSTARGB ||
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aInputFormat == INPUT_FORMAT_RGBA) &&
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useTransparency)
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colorType = PNG_COLOR_TYPE_RGB_ALPHA;
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else
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colorType = PNG_COLOR_TYPE_RGB;
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png_set_IHDR(mPNG, mPNGinfo, aWidth, aHeight, 8, colorType,
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PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT,
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PNG_FILTER_TYPE_DEFAULT);
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#ifdef PNG_APNG_SUPPORTED
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if (mIsAnimation) {
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png_set_first_frame_is_hidden(mPNG, mPNGinfo, skipFirstFrame);
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png_set_acTL(mPNG, mPNGinfo, numFrames, numPlays);
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}
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#endif
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// XXX: support PLTE, gAMA, tRNS, bKGD?
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png_write_info(mPNG, mPNGinfo);
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return NS_OK;
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}
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// Returns the number of bytes in the image buffer used.
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NS_IMETHODIMP
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nsPNGEncoder::GetImageBufferUsed(uint32_t* aOutputSize)
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{
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NS_ENSURE_ARG_POINTER(aOutputSize);
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*aOutputSize = mImageBufferUsed;
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return NS_OK;
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}
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// Returns a pointer to the start of the image buffer
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NS_IMETHODIMP
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nsPNGEncoder::GetImageBuffer(char** aOutputBuffer)
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{
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NS_ENSURE_ARG_POINTER(aOutputBuffer);
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*aOutputBuffer = reinterpret_cast<char*>(mImageBuffer);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsPNGEncoder::AddImageFrame(const uint8_t* aData,
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uint32_t aLength, // (unused, req'd by JS)
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uint32_t aWidth,
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uint32_t aHeight,
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uint32_t aStride,
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uint32_t aInputFormat,
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const nsAString& aFrameOptions)
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{
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bool useTransparency= true;
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uint32_t delay_ms = 500;
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#ifdef PNG_APNG_SUPPORTED
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uint32_t dispose_op = PNG_DISPOSE_OP_NONE;
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uint32_t blend_op = PNG_BLEND_OP_SOURCE;
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#else
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uint32_t dispose_op;
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uint32_t blend_op;
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#endif
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uint32_t x_offset = 0, y_offset = 0;
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// must be initialized
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if (mImageBuffer == nullptr) {
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return NS_ERROR_NOT_INITIALIZED;
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}
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// EndImageEncode was done, or some error occurred earlier
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if (!mPNG) {
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return NS_BASE_STREAM_CLOSED;
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}
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// validate input format
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if (aInputFormat != INPUT_FORMAT_RGB &&
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aInputFormat != INPUT_FORMAT_RGBA &&
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aInputFormat != INPUT_FORMAT_HOSTARGB)
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return NS_ERROR_INVALID_ARG;
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// libpng's error handler jumps back here upon an error.
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if (setjmp(png_jmpbuf(mPNG))) {
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png_destroy_write_struct(&mPNG, &mPNGinfo);
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return NS_ERROR_FAILURE;
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}
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// parse and check any provided output options
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nsresult rv = ParseOptions(aFrameOptions, &useTransparency, nullptr,
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nullptr, nullptr, &dispose_op, &blend_op,
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&delay_ms, &x_offset, &y_offset);
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if (rv != NS_OK) {
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return rv;
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}
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#ifdef PNG_APNG_SUPPORTED
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if (mIsAnimation) {
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// XXX the row pointers arg (#3) is unused, can it be removed?
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png_write_frame_head(mPNG, mPNGinfo, nullptr,
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aWidth, aHeight, x_offset, y_offset,
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delay_ms, 1000, dispose_op, blend_op);
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}
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#endif
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// Stride is the padded width of each row, so it better be longer
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// (I'm afraid people will not understand what stride means, so
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// check it well)
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if ((aInputFormat == INPUT_FORMAT_RGB &&
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aStride < aWidth * 3) ||
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((aInputFormat == INPUT_FORMAT_RGBA ||
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aInputFormat == INPUT_FORMAT_HOSTARGB) &&
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aStride < aWidth * 4)) {
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NS_WARNING("Invalid stride for InitFromData/AddImageFrame");
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return NS_ERROR_INVALID_ARG;
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}
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#ifdef PNG_WRITE_FILTER_SUPPORTED
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png_set_filter(mPNG, PNG_FILTER_TYPE_BASE, PNG_FILTER_VALUE_NONE);
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#endif
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// write each row: if we add more input formats, we may want to
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// generalize the conversions
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if (aInputFormat == INPUT_FORMAT_HOSTARGB) {
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// PNG requires RGBA with post-multiplied alpha, so we need to
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// convert
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UniquePtr<uint8_t[]> row = MakeUnique<uint8_t[]>(aWidth * 4);
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for (uint32_t y = 0; y < aHeight; y++) {
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ConvertHostARGBRow(&aData[y * aStride], row.get(), aWidth, useTransparency);
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png_write_row(mPNG, row.get());
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}
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} else if (aInputFormat == INPUT_FORMAT_RGBA && !useTransparency) {
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// RBGA, but we need to strip the alpha
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UniquePtr<uint8_t[]> row = MakeUnique<uint8_t[]>(aWidth * 4);
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for (uint32_t y = 0; y < aHeight; y++) {
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StripAlpha(&aData[y * aStride], row.get(), aWidth);
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png_write_row(mPNG, row.get());
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}
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} else if (aInputFormat == INPUT_FORMAT_RGB ||
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aInputFormat == INPUT_FORMAT_RGBA) {
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// simple RBG(A), no conversion needed
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for (uint32_t y = 0; y < aHeight; y++) {
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png_write_row(mPNG, (uint8_t*)&aData[y * aStride]);
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}
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} else {
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NS_NOTREACHED("Bad format type");
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return NS_ERROR_INVALID_ARG;
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}
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#ifdef PNG_APNG_SUPPORTED
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if (mIsAnimation) {
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png_write_frame_tail(mPNG, mPNGinfo);
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}
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#endif
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return NS_OK;
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}
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NS_IMETHODIMP
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nsPNGEncoder::EndImageEncode()
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{
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// must be initialized
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if (mImageBuffer == nullptr) {
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return NS_ERROR_NOT_INITIALIZED;
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}
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// EndImageEncode has already been called, or some error
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// occurred earlier
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if (!mPNG) {
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return NS_BASE_STREAM_CLOSED;
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}
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// libpng's error handler jumps back here upon an error.
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if (setjmp(png_jmpbuf(mPNG))) {
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png_destroy_write_struct(&mPNG, &mPNGinfo);
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return NS_ERROR_FAILURE;
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}
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png_write_end(mPNG, mPNGinfo);
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png_destroy_write_struct(&mPNG, &mPNGinfo);
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mFinished = true;
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NotifyListener();
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// if output callback can't get enough memory, it will free our buffer
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if (!mImageBuffer) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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return NS_OK;
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}
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nsresult
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nsPNGEncoder::ParseOptions(const nsAString& aOptions,
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bool* useTransparency,
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bool* skipFirstFrame,
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uint32_t* numFrames,
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uint32_t* numPlays,
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uint32_t* frameDispose,
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uint32_t* frameBlend,
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uint32_t* frameDelay,
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uint32_t* offsetX,
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uint32_t* offsetY)
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{
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#ifdef PNG_APNG_SUPPORTED
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// Make a copy of aOptions, because strtok() will modify it.
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nsAutoCString optionsCopy;
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optionsCopy.Assign(NS_ConvertUTF16toUTF8(aOptions));
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char* options = optionsCopy.BeginWriting();
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while (char* token = nsCRT::strtok(options, ";", &options)) {
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// If there's an '=' character, split the token around it.
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char* equals = token;
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char* value = nullptr;
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while(*equals != '=' && *equals) {
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++equals;
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}
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if (*equals == '=') {
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value = equals + 1;
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}
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if (value) {
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*equals = '\0'; // temporary null
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}
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// transparency=[yes|no|none]
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if (nsCRT::strcmp(token, "transparency") == 0 && useTransparency) {
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if (!value) {
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return NS_ERROR_INVALID_ARG;
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}
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if (nsCRT::strcmp(value, "none") == 0 ||
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nsCRT::strcmp(value, "no") == 0) {
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*useTransparency = false;
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} else if (nsCRT::strcmp(value, "yes") == 0) {
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*useTransparency = true;
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} else {
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return NS_ERROR_INVALID_ARG;
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}
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// skipfirstframe=[yes|no]
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} else if (nsCRT::strcmp(token, "skipfirstframe") == 0 &&
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skipFirstFrame) {
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if (!value) {
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return NS_ERROR_INVALID_ARG;
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}
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if (nsCRT::strcmp(value, "no") == 0) {
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*skipFirstFrame = false;
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} else if (nsCRT::strcmp(value, "yes") == 0) {
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*skipFirstFrame = true;
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} else {
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return NS_ERROR_INVALID_ARG;
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}
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// frames=#
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} else if (nsCRT::strcmp(token, "frames") == 0 && numFrames) {
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if (!value) {
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return NS_ERROR_INVALID_ARG;
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}
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if (PR_sscanf(value, "%u", numFrames) != 1) {
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return NS_ERROR_INVALID_ARG;
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}
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// frames=0 is nonsense.
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if (*numFrames == 0) {
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return NS_ERROR_INVALID_ARG;
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}
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// plays=#
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} else if (nsCRT::strcmp(token, "plays") == 0 && numPlays) {
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if (!value) {
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return NS_ERROR_INVALID_ARG;
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}
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// plays=0 to loop forever, otherwise play sequence specified
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// number of times
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if (PR_sscanf(value, "%u", numPlays) != 1) {
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return NS_ERROR_INVALID_ARG;
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}
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// dispose=[none|background|previous]
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} else if (nsCRT::strcmp(token, "dispose") == 0 && frameDispose) {
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if (!value) {
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return NS_ERROR_INVALID_ARG;
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}
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if (nsCRT::strcmp(value, "none") == 0) {
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*frameDispose = PNG_DISPOSE_OP_NONE;
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} else if (nsCRT::strcmp(value, "background") == 0) {
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*frameDispose = PNG_DISPOSE_OP_BACKGROUND;
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} else if (nsCRT::strcmp(value, "previous") == 0) {
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*frameDispose = PNG_DISPOSE_OP_PREVIOUS;
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} else {
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return NS_ERROR_INVALID_ARG;
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}
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// blend=[source|over]
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} else if (nsCRT::strcmp(token, "blend") == 0 && frameBlend) {
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if (!value) {
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return NS_ERROR_INVALID_ARG;
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}
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if (nsCRT::strcmp(value, "source") == 0) {
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*frameBlend = PNG_BLEND_OP_SOURCE;
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} else if (nsCRT::strcmp(value, "over") == 0) {
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*frameBlend = PNG_BLEND_OP_OVER;
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} else {
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return NS_ERROR_INVALID_ARG;
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}
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// delay=# (in ms)
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} else if (nsCRT::strcmp(token, "delay") == 0 && frameDelay) {
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if (!value) {
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return NS_ERROR_INVALID_ARG;
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}
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if (PR_sscanf(value, "%u", frameDelay) != 1) {
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return NS_ERROR_INVALID_ARG;
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}
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// xoffset=#
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} else if (nsCRT::strcmp(token, "xoffset") == 0 && offsetX) {
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if (!value) {
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return NS_ERROR_INVALID_ARG;
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}
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if (PR_sscanf(value, "%u", offsetX) != 1) {
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return NS_ERROR_INVALID_ARG;
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}
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// yoffset=#
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} else if (nsCRT::strcmp(token, "yoffset") == 0 && offsetY) {
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if (!value) {
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return NS_ERROR_INVALID_ARG;
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}
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if (PR_sscanf(value, "%u", offsetY) != 1) {
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return NS_ERROR_INVALID_ARG;
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}
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// unknown token name
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} else
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return NS_ERROR_INVALID_ARG;
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if (value) {
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*equals = '='; // restore '=' so strtok doesn't get lost
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}
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}
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#endif
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return NS_OK;
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}
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NS_IMETHODIMP
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nsPNGEncoder::Close()
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{
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if (mImageBuffer != nullptr) {
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free(mImageBuffer);
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mImageBuffer = nullptr;
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mImageBufferSize = 0;
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mImageBufferUsed = 0;
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mImageBufferReadPoint = 0;
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsPNGEncoder::Available(uint64_t* _retval)
|
|
{
|
|
if (!mImageBuffer) {
|
|
return NS_BASE_STREAM_CLOSED;
|
|
}
|
|
|
|
*_retval = mImageBufferUsed - mImageBufferReadPoint;
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsPNGEncoder::Read(char* aBuf, uint32_t aCount, uint32_t* _retval)
|
|
{
|
|
return ReadSegments(NS_CopySegmentToBuffer, aBuf, aCount, _retval);
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsPNGEncoder::ReadSegments(nsWriteSegmentFun aWriter,
|
|
void* aClosure, uint32_t aCount,
|
|
uint32_t* _retval)
|
|
{
|
|
// Avoid another thread reallocing the buffer underneath us
|
|
ReentrantMonitorAutoEnter autoEnter(mReentrantMonitor);
|
|
|
|
uint32_t maxCount = mImageBufferUsed - mImageBufferReadPoint;
|
|
if (maxCount == 0) {
|
|
*_retval = 0;
|
|
return mFinished ? NS_OK : NS_BASE_STREAM_WOULD_BLOCK;
|
|
}
|
|
|
|
if (aCount > maxCount) {
|
|
aCount = maxCount;
|
|
}
|
|
|
|
nsresult rv =
|
|
aWriter(this, aClosure,
|
|
reinterpret_cast<const char*>(mImageBuffer+mImageBufferReadPoint),
|
|
0, aCount, _retval);
|
|
if (NS_SUCCEEDED(rv)) {
|
|
NS_ASSERTION(*_retval <= aCount, "bad write count");
|
|
mImageBufferReadPoint += *_retval;
|
|
}
|
|
|
|
// errors returned from the writer end here!
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsPNGEncoder::IsNonBlocking(bool* _retval)
|
|
{
|
|
*_retval = true;
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsPNGEncoder::AsyncWait(nsIInputStreamCallback* aCallback,
|
|
uint32_t aFlags,
|
|
uint32_t aRequestedCount,
|
|
nsIEventTarget* aTarget)
|
|
{
|
|
if (aFlags != 0) {
|
|
return NS_ERROR_NOT_IMPLEMENTED;
|
|
}
|
|
|
|
if (mCallback || mCallbackTarget) {
|
|
return NS_ERROR_UNEXPECTED;
|
|
}
|
|
|
|
mCallbackTarget = aTarget;
|
|
// 0 means "any number of bytes except 0"
|
|
mNotifyThreshold = aRequestedCount;
|
|
if (!aRequestedCount) {
|
|
mNotifyThreshold = 1024; // We don't want to notify incessantly
|
|
}
|
|
|
|
// We set the callback absolutely last, because NotifyListener uses it to
|
|
// determine if someone needs to be notified. If we don't set it last,
|
|
// NotifyListener might try to fire off a notification to a null target
|
|
// which will generally cause non-threadsafe objects to be used off the main
|
|
// thread
|
|
mCallback = aCallback;
|
|
|
|
// What we are being asked for may be present already
|
|
NotifyListener();
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsPNGEncoder::CloseWithStatus(nsresult aStatus)
|
|
{
|
|
return Close();
|
|
}
|
|
|
|
// nsPNGEncoder::ConvertHostARGBRow
|
|
//
|
|
// Our colors are stored with premultiplied alphas, but PNGs use
|
|
// post-multiplied alpha. This swaps to PNG-style alpha.
|
|
//
|
|
// Copied from gfx/cairo/cairo/src/cairo-png.c
|
|
|
|
void
|
|
nsPNGEncoder::ConvertHostARGBRow(const uint8_t* aSrc, uint8_t* aDest,
|
|
uint32_t aPixelWidth,
|
|
bool aUseTransparency)
|
|
{
|
|
uint32_t pixelStride = aUseTransparency ? 4 : 3;
|
|
for (uint32_t x = 0; x < aPixelWidth; x++) {
|
|
const uint32_t& pixelIn = ((const uint32_t*)(aSrc))[x];
|
|
uint8_t* pixelOut = &aDest[x * pixelStride];
|
|
|
|
uint8_t alpha = (pixelIn & 0xff000000) >> 24;
|
|
pixelOut[pixelStride - 1] = alpha; // overwritten below if pixelStride == 3
|
|
if (alpha == 255) {
|
|
pixelOut[0] = (pixelIn & 0xff0000) >> 16;
|
|
pixelOut[1] = (pixelIn & 0x00ff00) >> 8;
|
|
pixelOut[2] = (pixelIn & 0x0000ff) ;
|
|
} else if (alpha == 0) {
|
|
pixelOut[0] = pixelOut[1] = pixelOut[2] = 0;
|
|
} else {
|
|
pixelOut[0] = (((pixelIn & 0xff0000) >> 16) * 255 + alpha / 2) / alpha;
|
|
pixelOut[1] = (((pixelIn & 0x00ff00) >> 8) * 255 + alpha / 2) / alpha;
|
|
pixelOut[2] = (((pixelIn & 0x0000ff) ) * 255 + alpha / 2) / alpha;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
// nsPNGEncoder::StripAlpha
|
|
//
|
|
// Input is RGBA, output is RGB
|
|
|
|
void
|
|
nsPNGEncoder::StripAlpha(const uint8_t* aSrc, uint8_t* aDest,
|
|
uint32_t aPixelWidth)
|
|
{
|
|
for (uint32_t x = 0; x < aPixelWidth; x++) {
|
|
const uint8_t* pixelIn = &aSrc[x * 4];
|
|
uint8_t* pixelOut = &aDest[x * 3];
|
|
pixelOut[0] = pixelIn[0];
|
|
pixelOut[1] = pixelIn[1];
|
|
pixelOut[2] = pixelIn[2];
|
|
}
|
|
}
|
|
|
|
|
|
// nsPNGEncoder::WarningCallback
|
|
|
|
void
|
|
nsPNGEncoder::WarningCallback(png_structp png_ptr,
|
|
png_const_charp warning_msg)
|
|
{
|
|
MOZ_LOG(sPNGEncoderLog, LogLevel::Warning,
|
|
("libpng warning: %s\n", warning_msg));
|
|
}
|
|
|
|
|
|
// nsPNGEncoder::ErrorCallback
|
|
|
|
void
|
|
nsPNGEncoder::ErrorCallback(png_structp png_ptr,
|
|
png_const_charp error_msg)
|
|
{
|
|
MOZ_LOG(sPNGEncoderLog, LogLevel::Error, ("libpng error: %s\n", error_msg));
|
|
png_longjmp(png_ptr, 1);
|
|
}
|
|
|
|
// nsPNGEncoder::WriteCallback
|
|
|
|
void // static
|
|
nsPNGEncoder::WriteCallback(png_structp png, png_bytep data,
|
|
png_size_t size)
|
|
{
|
|
nsPNGEncoder* that = static_cast<nsPNGEncoder*>(png_get_io_ptr(png));
|
|
if (!that->mImageBuffer) {
|
|
return;
|
|
}
|
|
|
|
CheckedUint32 sizeNeeded = CheckedUint32(that->mImageBufferUsed) + size;
|
|
if (!sizeNeeded.isValid()) {
|
|
// Take the lock to ensure that nobody is trying to read from the buffer
|
|
// we are destroying
|
|
ReentrantMonitorAutoEnter autoEnter(that->mReentrantMonitor);
|
|
|
|
that->NullOutImageBuffer();
|
|
return;
|
|
}
|
|
|
|
if (sizeNeeded.value() > that->mImageBufferSize) {
|
|
// When we're reallocing the buffer we need to take the lock to ensure
|
|
// that nobody is trying to read from the buffer we are destroying
|
|
ReentrantMonitorAutoEnter autoEnter(that->mReentrantMonitor);
|
|
|
|
while (sizeNeeded.value() > that->mImageBufferSize) {
|
|
// expand buffer, just double each time
|
|
CheckedUint32 bufferSize = CheckedUint32(that->mImageBufferSize) * 2;
|
|
if (!bufferSize.isValid()) {
|
|
that->NullOutImageBuffer();
|
|
return;
|
|
}
|
|
that->mImageBufferSize *= 2;
|
|
uint8_t* newBuf = (uint8_t*)realloc(that->mImageBuffer,
|
|
that->mImageBufferSize);
|
|
if (!newBuf) {
|
|
// can't resize, just zero (this will keep us from writing more)
|
|
that->NullOutImageBuffer();
|
|
return;
|
|
}
|
|
that->mImageBuffer = newBuf;
|
|
}
|
|
}
|
|
|
|
memcpy(&that->mImageBuffer[that->mImageBufferUsed], data, size);
|
|
that->mImageBufferUsed += size;
|
|
that->NotifyListener();
|
|
}
|
|
|
|
void nsPNGEncoder::NullOutImageBuffer()
|
|
{
|
|
mReentrantMonitor.AssertCurrentThreadIn();
|
|
|
|
free(mImageBuffer);
|
|
mImageBuffer = nullptr;
|
|
mImageBufferSize = 0;
|
|
mImageBufferUsed = 0;
|
|
}
|
|
|
|
void
|
|
nsPNGEncoder::NotifyListener()
|
|
{
|
|
// We might call this function on multiple threads (any threads that call
|
|
// AsyncWait and any that do encoding) so we lock to avoid notifying the
|
|
// listener twice about the same data (which generally leads to a truncated
|
|
// image).
|
|
ReentrantMonitorAutoEnter autoEnter(mReentrantMonitor);
|
|
|
|
if (mCallback &&
|
|
(mImageBufferUsed - mImageBufferReadPoint >= mNotifyThreshold ||
|
|
mFinished)) {
|
|
nsCOMPtr<nsIInputStreamCallback> callback;
|
|
if (mCallbackTarget) {
|
|
callback = NS_NewInputStreamReadyEvent(mCallback, mCallbackTarget);
|
|
} else {
|
|
callback = mCallback;
|
|
}
|
|
|
|
NS_ASSERTION(callback, "Shouldn't fail to make the callback");
|
|
// Null the callback first because OnInputStreamReady could reenter
|
|
// AsyncWait
|
|
mCallback = nullptr;
|
|
mCallbackTarget = nullptr;
|
|
mNotifyThreshold = 0;
|
|
|
|
callback->OnInputStreamReady(this);
|
|
}
|
|
}
|