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-rw-r--r--image/encoders/webp/moz.build15
-rw-r--r--image/encoders/webp/nsWebPEncoder.cpp342
-rw-r--r--image/encoders/webp/nsWebPEncoder.h63
3 files changed, 420 insertions, 0 deletions
diff --git a/image/encoders/webp/moz.build b/image/encoders/webp/moz.build
new file mode 100644
index 0000000000..4363caa79f
--- /dev/null
+++ b/image/encoders/webp/moz.build
@@ -0,0 +1,15 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+SOURCES += [
+ "nsWebPEncoder.cpp",
+]
+
+LOCAL_INCLUDES += [
+ "/image",
+]
+
+FINAL_LIBRARY = "xul"
diff --git a/image/encoders/webp/nsWebPEncoder.cpp b/image/encoders/webp/nsWebPEncoder.cpp
new file mode 100644
index 0000000000..72ac1388e9
--- /dev/null
+++ b/image/encoders/webp/nsWebPEncoder.cpp
@@ -0,0 +1,342 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// #include "ImageLogging.h"
+#include "nsCRT.h"
+#include "nsWebPEncoder.h"
+#include "nsStreamUtils.h"
+#include "nsString.h"
+#include "prprf.h"
+#include "mozilla/CheckedInt.h"
+#include "mozilla/UniquePtrExtensions.h"
+
+using namespace mozilla;
+
+// static LazyLogModule sWEBPEncoderLog("WEBPEncoder");
+
+NS_IMPL_ISUPPORTS(nsWebPEncoder, imgIEncoder, nsIInputStream,
+ nsIAsyncInputStream)
+
+nsWebPEncoder::nsWebPEncoder()
+ : mFinished(false),
+ mImageBuffer(nullptr),
+ mImageBufferSize(0),
+ mImageBufferUsed(0),
+ mImageBufferReadPoint(0),
+ mCallback(nullptr),
+ mCallbackTarget(nullptr),
+ mNotifyThreshold(0),
+ mReentrantMonitor("nsWebPEncoder.mReentrantMonitor") {}
+
+nsWebPEncoder::~nsWebPEncoder() {
+ if (mImageBuffer) {
+ WebPFree(mImageBuffer);
+ mImageBuffer = nullptr;
+ mImageBufferSize = 0;
+ mImageBufferUsed = 0;
+ mImageBufferReadPoint = 0;
+ }
+}
+
+// nsWebPEncoder::InitFromData
+//
+// One output option is supported: "quality=X" where X is an integer in the
+// range 0-100. Higher values for X give better quality.
+
+NS_IMETHODIMP
+nsWebPEncoder::InitFromData(const uint8_t* aData,
+ uint32_t aLength, // (unused, req'd by JS)
+ uint32_t aWidth, uint32_t aHeight, uint32_t aStride,
+ uint32_t aInputFormat,
+ const nsAString& aOutputOptions) {
+ NS_ENSURE_ARG(aData);
+
+ // validate input format
+ if (aInputFormat != INPUT_FORMAT_RGB && aInputFormat != INPUT_FORMAT_RGBA &&
+ aInputFormat != INPUT_FORMAT_HOSTARGB)
+ return NS_ERROR_INVALID_ARG;
+
+ // Stride is the padded width of each row, so it better be longer (I'm afraid
+ // people will not understand what stride means, so check it well)
+ if ((aInputFormat == INPUT_FORMAT_RGB && aStride < aWidth * 3) ||
+ ((aInputFormat == INPUT_FORMAT_RGBA ||
+ aInputFormat == INPUT_FORMAT_HOSTARGB) &&
+ aStride < aWidth * 4)) {
+ NS_WARNING("Invalid stride for InitFromData");
+ return NS_ERROR_INVALID_ARG;
+ }
+
+ // can't initialize more than once
+ if (mImageBuffer != nullptr) {
+ return NS_ERROR_ALREADY_INITIALIZED;
+ }
+
+ // options: we only have one option so this is easy
+ int quality = 92;
+ if (aOutputOptions.Length() > 0) {
+ // have options string
+ const nsString qualityPrefix(u"quality="_ns);
+ if (aOutputOptions.Length() > qualityPrefix.Length() &&
+ StringBeginsWith(aOutputOptions, qualityPrefix)) {
+ // have quality string
+ nsCString value = NS_ConvertUTF16toUTF8(
+ Substring(aOutputOptions, qualityPrefix.Length()));
+ int newquality = -1;
+ if (PR_sscanf(value.get(), "%d", &newquality) == 1) {
+ if (newquality >= 0 && newquality <= 100) {
+ quality = newquality;
+ } else {
+ NS_WARNING(
+ "Quality value out of range, should be 0-100,"
+ " using default");
+ }
+ } else {
+ NS_WARNING(
+ "Quality value invalid, should be integer 0-100,"
+ " using default");
+ }
+ } else {
+ return NS_ERROR_INVALID_ARG;
+ }
+ }
+
+ size_t size = 0;
+
+ CheckedInt32 width = CheckedInt32(aWidth);
+ CheckedInt32 height = CheckedInt32(aHeight);
+ CheckedInt32 stride = CheckedInt32(aStride);
+ if (!width.isValid() || !height.isValid() || !stride.isValid() ||
+ !(CheckedUint32(aStride) * CheckedUint32(aHeight)).isValid()) {
+ return NS_ERROR_INVALID_ARG;
+ }
+
+ if (aInputFormat == INPUT_FORMAT_RGB) {
+ size = quality == 100
+ ? WebPEncodeLosslessRGB(aData, width.value(), height.value(),
+ stride.value(), &mImageBuffer)
+ : WebPEncodeRGB(aData, width.value(), height.value(),
+ stride.value(), quality, &mImageBuffer);
+ } else if (aInputFormat == INPUT_FORMAT_RGBA) {
+ size = quality == 100
+ ? WebPEncodeLosslessRGBA(aData, width.value(), height.value(),
+ stride.value(), &mImageBuffer)
+ : WebPEncodeRGBA(aData, width.value(), height.value(),
+ stride.value(), quality, &mImageBuffer);
+ } else if (aInputFormat == INPUT_FORMAT_HOSTARGB) {
+ UniquePtr<uint8_t[]> aDest =
+ MakeUniqueFallible<uint8_t[]>(aStride * aHeight);
+ if (NS_WARN_IF(!aDest)) {
+ return NS_ERROR_OUT_OF_MEMORY;
+ }
+
+ for (uint32_t y = 0; y < aHeight; y++) {
+ for (uint32_t x = 0; x < aWidth; x++) {
+ const uint32_t& pixelIn =
+ ((const uint32_t*)(aData))[y * aStride / 4 + x];
+ uint8_t* pixelOut = &aDest[y * aStride + x * 4];
+
+ uint8_t alpha = (pixelIn & 0xff000000) >> 24;
+ pixelOut[3] = alpha;
+ 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;
+ }
+ }
+ }
+
+ size =
+ quality == 100
+ ? WebPEncodeLosslessRGBA(aDest.get(), width.value(), height.value(),
+ stride.value(), &mImageBuffer)
+ : WebPEncodeRGBA(aDest.get(), width.value(), height.value(),
+ stride.value(), quality, &mImageBuffer);
+ }
+
+ mFinished = true;
+
+ if (size == 0) {
+ return NS_ERROR_FAILURE;
+ }
+
+ mImageBufferUsed = size;
+
+ return NS_OK;
+}
+
+// nsWebPEncoder::StartImageEncode
+//
+//
+// See ::InitFromData for other info.
+NS_IMETHODIMP
+nsWebPEncoder::StartImageEncode(uint32_t aWidth, uint32_t aHeight,
+ uint32_t aInputFormat,
+ const nsAString& aOutputOptions) {
+ return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+// Returns the number of bytes in the image buffer used.
+NS_IMETHODIMP
+nsWebPEncoder::GetImageBufferUsed(uint32_t* aOutputSize) {
+ NS_ENSURE_ARG_POINTER(aOutputSize);
+ *aOutputSize = mImageBufferUsed;
+ return NS_OK;
+}
+
+// Returns a pointer to the start of the image buffer
+NS_IMETHODIMP
+nsWebPEncoder::GetImageBuffer(char** aOutputBuffer) {
+ NS_ENSURE_ARG_POINTER(aOutputBuffer);
+ *aOutputBuffer = reinterpret_cast<char*>(mImageBuffer);
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsWebPEncoder::AddImageFrame(const uint8_t* aData,
+ uint32_t aLength, // (unused, req'd by JS)
+ uint32_t aWidth, uint32_t aHeight,
+ uint32_t aStride, uint32_t aInputFormat,
+ const nsAString& aFrameOptions) {
+ return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP
+nsWebPEncoder::EndImageEncode() { return NS_ERROR_NOT_IMPLEMENTED; }
+
+NS_IMETHODIMP
+nsWebPEncoder::Close() {
+ if (mImageBuffer) {
+ WebPFree(mImageBuffer);
+ mImageBuffer = nullptr;
+ mImageBufferSize = 0;
+ mImageBufferUsed = 0;
+ mImageBufferReadPoint = 0;
+ }
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsWebPEncoder::Available(uint64_t* _retval) {
+ if (!mImageBuffer) {
+ return NS_BASE_STREAM_CLOSED;
+ }
+
+ *_retval = mImageBufferUsed - mImageBufferReadPoint;
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsWebPEncoder::StreamStatus() {
+ return mImageBuffer ? NS_OK : NS_BASE_STREAM_CLOSED;
+}
+
+NS_IMETHODIMP
+nsWebPEncoder::Read(char* aBuf, uint32_t aCount, uint32_t* _retval) {
+ return ReadSegments(NS_CopySegmentToBuffer, aBuf, aCount, _retval);
+}
+
+NS_IMETHODIMP
+nsWebPEncoder::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
+nsWebPEncoder::IsNonBlocking(bool* _retval) {
+ *_retval = true;
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsWebPEncoder::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; // 1 KB seems good. 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
+nsWebPEncoder::CloseWithStatus(nsresult aStatus) { return Close(); }
+
+void nsWebPEncoder::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("nsWebPEncoder::NotifyListener",
+ 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);
+ }
+}
diff --git a/image/encoders/webp/nsWebPEncoder.h b/image/encoders/webp/nsWebPEncoder.h
new file mode 100644
index 0000000000..8628d12388
--- /dev/null
+++ b/image/encoders/webp/nsWebPEncoder.h
@@ -0,0 +1,63 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_image_encoders_webp_nsWebPEncoder_h
+#define mozilla_image_encoders_webp_nsWebPEncoder_h
+
+#include "webp/encode.h"
+
+#include "imgIEncoder.h"
+#include "nsCOMPtr.h"
+
+#include "mozilla/Attributes.h"
+#include "mozilla/ReentrantMonitor.h"
+
+#define NS_WEBPENCODER_CID \
+ { /* a8e5a8e5-bebf-4512-9f50-e41e4748ce28 */ \
+ 0xa8e5a8e5, 0xbebf, 0x4512, { \
+ 0x9f, 0x50, 0xe4, 0x1e, 0x47, 0x48, 0xce, 0x28 \
+ } \
+ }
+
+// Provides WEBP encoding functionality. Use InitFromData() to do the
+// encoding. See that function definition for encoding options.
+
+class nsWebPEncoder final : public imgIEncoder {
+ typedef mozilla::ReentrantMonitor ReentrantMonitor;
+
+ public:
+ NS_DECL_THREADSAFE_ISUPPORTS
+ NS_DECL_IMGIENCODER
+ NS_DECL_NSIINPUTSTREAM
+ NS_DECL_NSIASYNCINPUTSTREAM
+
+ nsWebPEncoder();
+
+ protected:
+ ~nsWebPEncoder();
+
+ void NotifyListener();
+
+ bool mFinished;
+
+ // image buffer
+ uint8_t* mImageBuffer;
+ uint32_t mImageBufferSize;
+ uint32_t mImageBufferUsed;
+
+ uint32_t mImageBufferReadPoint;
+
+ nsCOMPtr<nsIInputStreamCallback> mCallback;
+ nsCOMPtr<nsIEventTarget> mCallbackTarget;
+ uint32_t mNotifyThreshold;
+
+ // nsWebPEncoder is designed to allow one thread to pump data into it while
+ // another reads from it. We lock to ensure that the buffer remains
+ // append-only while we read from it (that it is not realloced) and to
+ // ensure that only one thread dispatches a callback for each call to
+ // AsyncWait.
+ ReentrantMonitor mReentrantMonitor MOZ_UNANNOTATED;
+};
+#endif // mozilla_image_encoders_webp_nsWebPEncoder_h