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gecko-dev/image/encoders/bmp/nsBMPEncoder.cpp

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/* -*- 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 "nsCRT.h"
#include "mozilla/EndianUtils.h"
#include "mozilla/UniquePtrExtensions.h"
#include "nsBMPEncoder.h"
#include "nsString.h"
#include "nsStreamUtils.h"
#include "nsTArray.h"
#include "mozilla/CheckedInt.h"
#include "BMPHeaders.h"
using namespace mozilla;
using namespace mozilla::image;
using namespace mozilla::image::bmp;
NS_IMPL_ISUPPORTS(nsBMPEncoder, imgIEncoder, nsIInputStream,
nsIAsyncInputStream)
nsBMPEncoder::nsBMPEncoder()
: mBMPInfoHeader{},
mImageBufferStart(nullptr),
mImageBufferCurr(0),
mImageBufferSize(0),
mImageBufferReadPoint(0),
mFinished(false),
mCallback(nullptr),
mCallbackTarget(nullptr),
mNotifyThreshold(0) {
this->mBMPFileHeader.filesize = 0;
this->mBMPFileHeader.reserved = 0;
this->mBMPFileHeader.dataoffset = 0;
}
nsBMPEncoder::~nsBMPEncoder() {
if (mImageBufferStart) {
free(mImageBufferStart);
mImageBufferStart = nullptr;
mImageBufferCurr = nullptr;
}
}
// nsBMPEncoder::InitFromData
//
// One output option is supported: bpp=<bpp_value>
// bpp specifies the bits per pixel to use where bpp_value can be 24 or 32
NS_IMETHODIMP
nsBMPEncoder::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) {
// validate input format
if (aInputFormat != INPUT_FORMAT_RGB && aInputFormat != INPUT_FORMAT_RGBA &&
aInputFormat != INPUT_FORMAT_HOSTARGB) {
return NS_ERROR_INVALID_ARG;
}
CheckedInt32 check = CheckedInt32(aWidth) * 4;
if (MOZ_UNLIKELY(!check.isValid())) {
return NS_ERROR_INVALID_ARG;
}
// Stride is the padded width of each row, so it better be longer
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;
}
nsresult rv;
rv = StartImageEncode(aWidth, aHeight, aInputFormat, aOutputOptions);
if (NS_FAILED(rv)) {
return rv;
}
rv = AddImageFrame(aData, aLength, aWidth, aHeight, aStride, aInputFormat,
aOutputOptions);
if (NS_FAILED(rv)) {
return rv;
}
rv = EndImageEncode();
return rv;
}
// Just a helper method to make it explicit in calculations that we are dealing
// with bytes and not bits
static inline uint16_t BytesPerPixel(uint16_t aBPP) { return aBPP / 8; }
// Calculates the number of padding bytes that are needed per row of image data
static inline uint32_t PaddingBytes(uint16_t aBPP, uint32_t aWidth) {
uint32_t rowSize = aWidth * BytesPerPixel(aBPP);
uint8_t paddingSize = 0;
if (rowSize % 4) {
paddingSize = (4 - (rowSize % 4));
}
return paddingSize;
}
// See ::InitFromData for other info.
NS_IMETHODIMP
nsBMPEncoder::StartImageEncode(uint32_t aWidth, uint32_t aHeight,
uint32_t aInputFormat,
const nsAString& aOutputOptions) {
// can't initialize more than once
if (mImageBufferStart || mImageBufferCurr) {
return NS_ERROR_ALREADY_INITIALIZED;
}
// validate input format
if (aInputFormat != INPUT_FORMAT_RGB && aInputFormat != INPUT_FORMAT_RGBA &&
aInputFormat != INPUT_FORMAT_HOSTARGB) {
return NS_ERROR_INVALID_ARG;
}
// parse and check any provided output options
Version version;
uint16_t bpp;
nsresult rv = ParseOptions(aOutputOptions, version, bpp);
if (NS_FAILED(rv)) {
return rv;
}
MOZ_ASSERT(bpp <= 32);
rv = InitFileHeader(version, bpp, aWidth, aHeight);
if (NS_FAILED(rv)) {
return rv;
}
rv = InitInfoHeader(version, bpp, aWidth, aHeight);
if (NS_FAILED(rv)) {
return rv;
}
mImageBufferSize = mBMPFileHeader.filesize;
mImageBufferStart = static_cast<uint8_t*>(malloc(mImageBufferSize));
if (!mImageBufferStart) {
return NS_ERROR_OUT_OF_MEMORY;
}
mImageBufferCurr = mImageBufferStart;
EncodeFileHeader();
EncodeInfoHeader();
return NS_OK;
}
// Returns the number of bytes in the image buffer used.
// For a BMP file, this is all bytes in the buffer.
NS_IMETHODIMP
nsBMPEncoder::GetImageBufferUsed(uint32_t* aOutputSize) {
NS_ENSURE_ARG_POINTER(aOutputSize);
*aOutputSize = mImageBufferSize;
return NS_OK;
}
// Returns a pointer to the start of the image buffer
NS_IMETHODIMP
nsBMPEncoder::GetImageBuffer(char** aOutputBuffer) {
NS_ENSURE_ARG_POINTER(aOutputBuffer);
*aOutputBuffer = reinterpret_cast<char*>(mImageBufferStart);
return NS_OK;
}
NS_IMETHODIMP
nsBMPEncoder::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) {
// must be initialized
if (!mImageBufferStart || !mImageBufferCurr) {
return NS_ERROR_NOT_INITIALIZED;
}
// validate input format
if (aInputFormat != INPUT_FORMAT_RGB && aInputFormat != INPUT_FORMAT_RGBA &&
aInputFormat != INPUT_FORMAT_HOSTARGB) {
return NS_ERROR_INVALID_ARG;
}
if (mBMPInfoHeader.width < 0) {
return NS_ERROR_ILLEGAL_VALUE;
}
CheckedUint32 size = CheckedUint32(mBMPInfoHeader.width) *
CheckedUint32(BytesPerPixel(mBMPInfoHeader.bpp));
if (MOZ_UNLIKELY(!size.isValid())) {
return NS_ERROR_FAILURE;
}
auto row = MakeUniqueFallible<uint8_t[]>(size.value());
if (!row) {
return NS_ERROR_OUT_OF_MEMORY;
}
CheckedUint32 check = CheckedUint32(mBMPInfoHeader.height) * aStride;
if (MOZ_UNLIKELY(!check.isValid())) {
return NS_ERROR_FAILURE;
}
// write each row: if we add more input formats, we may want to
// generalize the conversions
if (aInputFormat == INPUT_FORMAT_HOSTARGB) {
// BMP requires RGBA with post-multiplied alpha, so we need to convert
for (int32_t y = mBMPInfoHeader.height - 1; y >= 0; y--) {
ConvertHostARGBRow(&aData[y * aStride], row, mBMPInfoHeader.width);
if (mBMPInfoHeader.bpp == 24) {
EncodeImageDataRow24(row.get());
} else {
EncodeImageDataRow32(row.get());
}
}
} else if (aInputFormat == INPUT_FORMAT_RGBA) {
// simple RGBA, no conversion needed
for (int32_t y = 0; y < mBMPInfoHeader.height; y++) {
if (mBMPInfoHeader.bpp == 24) {
EncodeImageDataRow24(row.get());
} else {
EncodeImageDataRow32(row.get());
}
}
} else if (aInputFormat == INPUT_FORMAT_RGB) {
// simple RGB, no conversion needed
for (int32_t y = 0; y < mBMPInfoHeader.height; y++) {
if (mBMPInfoHeader.bpp == 24) {
EncodeImageDataRow24(&aData[y * aStride]);
} else {
EncodeImageDataRow32(&aData[y * aStride]);
}
}
} else {
MOZ_ASSERT_UNREACHABLE("Bad format type");
return NS_ERROR_INVALID_ARG;
}
return NS_OK;
}
NS_IMETHODIMP
nsBMPEncoder::EndImageEncode() {
// must be initialized
if (!mImageBufferStart || !mImageBufferCurr) {
return NS_ERROR_NOT_INITIALIZED;
}
mFinished = true;
NotifyListener();
// if output callback can't get enough memory, it will free our buffer
if (!mImageBufferStart || !mImageBufferCurr) {
return NS_ERROR_OUT_OF_MEMORY;
}
return NS_OK;
}
// Parses the encoder options and sets the bits per pixel to use
// See InitFromData for a description of the parse options
nsresult nsBMPEncoder::ParseOptions(const nsAString& aOptions,
Version& aVersionOut, uint16_t& aBppOut) {
aVersionOut = VERSION_3;
aBppOut = 24;
// Parse the input string into a set of name/value pairs.
// From a format like: name=value;bpp=<bpp_value>;name=value
// to format: [0] = name=value, [1] = bpp=<bpp_value>, [2] = name=value
nsTArray<nsCString> nameValuePairs;
if (!ParseString(NS_ConvertUTF16toUTF8(aOptions), ';', nameValuePairs)) {
return NS_ERROR_INVALID_ARG;
}
// For each name/value pair in the set
for (uint32_t i = 0; i < nameValuePairs.Length(); ++i) {
// Split the name value pair [0] = name, [1] = value
nsTArray<nsCString> nameValuePair;
if (!ParseString(nameValuePairs[i], '=', nameValuePair)) {
return NS_ERROR_INVALID_ARG;
}
if (nameValuePair.Length() != 2) {
return NS_ERROR_INVALID_ARG;
}
// Parse the bpp portion of the string name=value;version=<version_value>;
// name=value
if (nameValuePair[0].Equals("version",
nsCaseInsensitiveCStringComparator())) {
if (nameValuePair[1].EqualsLiteral("3")) {
aVersionOut = VERSION_3;
} else if (nameValuePair[1].EqualsLiteral("5")) {
aVersionOut = VERSION_5;
} else {
return NS_ERROR_INVALID_ARG;
}
}
// Parse the bpp portion of the string name=value;bpp=<bpp_value>;name=value
if (nameValuePair[0].Equals("bpp", nsCaseInsensitiveCStringComparator())) {
if (nameValuePair[1].EqualsLiteral("24")) {
aBppOut = 24;
} else if (nameValuePair[1].EqualsLiteral("32")) {
aBppOut = 32;
} else {
return NS_ERROR_INVALID_ARG;
}
}
}
return NS_OK;
}
NS_IMETHODIMP
nsBMPEncoder::Close() {
if (mImageBufferStart) {
free(mImageBufferStart);
mImageBufferStart = nullptr;
mImageBufferSize = 0;
mImageBufferReadPoint = 0;
mImageBufferCurr = nullptr;
}
return NS_OK;
}
// Obtains the available bytes to read
NS_IMETHODIMP
nsBMPEncoder::Available(uint64_t* _retval) {
if (!mImageBufferStart || !mImageBufferCurr) {
return NS_BASE_STREAM_CLOSED;
}
*_retval = GetCurrentImageBufferOffset() - mImageBufferReadPoint;
return NS_OK;
}
// [noscript] Reads bytes which are available
NS_IMETHODIMP
nsBMPEncoder::Read(char* aBuf, uint32_t aCount, uint32_t* _retval) {
return ReadSegments(NS_CopySegmentToBuffer, aBuf, aCount, _retval);
}
// [noscript] Reads segments
NS_IMETHODIMP
nsBMPEncoder::ReadSegments(nsWriteSegmentFun aWriter, void* aClosure,
uint32_t aCount, uint32_t* _retval) {
uint32_t maxCount = GetCurrentImageBufferOffset() - 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*>(mImageBufferStart + 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
nsBMPEncoder::IsNonBlocking(bool* _retval) {
*_retval = true;
return NS_OK;
}
NS_IMETHODIMP
nsBMPEncoder::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
nsBMPEncoder::CloseWithStatus(nsresult aStatus) { return Close(); }
// nsBMPEncoder::ConvertHostARGBRow
//
// Our colors are stored with premultiplied alphas, but we need
// an output with no alpha in machine-independent byte order.
//
void nsBMPEncoder::ConvertHostARGBRow(const uint8_t* aSrc,
const UniquePtr<uint8_t[]>& aDest,
uint32_t aPixelWidth) {
uint16_t bytes = BytesPerPixel(mBMPInfoHeader.bpp);
if (mBMPInfoHeader.bpp == 32) {
for (uint32_t x = 0; x < aPixelWidth; x++) {
const uint32_t& pixelIn = ((const uint32_t*)(aSrc))[x];
uint8_t* pixelOut = &aDest[x * bytes];
pixelOut[0] = (pixelIn & 0x00ff0000) >> 16;
pixelOut[1] = (pixelIn & 0x0000ff00) >> 8;
pixelOut[2] = (pixelIn & 0x000000ff) >> 0;
pixelOut[3] = (pixelIn & 0xff000000) >> 24;
}
} else {
for (uint32_t x = 0; x < aPixelWidth; x++) {
const uint32_t& pixelIn = ((const uint32_t*)(aSrc))[x];
uint8_t* pixelOut = &aDest[x * bytes];
pixelOut[0] = (pixelIn & 0xff0000) >> 16;
pixelOut[1] = (pixelIn & 0x00ff00) >> 8;
pixelOut[2] = (pixelIn & 0x0000ff) >> 0;
}
}
}
void nsBMPEncoder::NotifyListener() {
if (mCallback && (GetCurrentImageBufferOffset() - mImageBufferReadPoint >=
mNotifyThreshold ||
mFinished)) {
nsCOMPtr<nsIInputStreamCallback> callback;
if (mCallbackTarget) {
callback = NS_NewInputStreamReadyEvent("nsBMPEncoder::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);
}
}
// Initializes the BMP file header mBMPFileHeader to the passed in values
nsresult nsBMPEncoder::InitFileHeader(Version aVersion, uint16_t aBPP,
uint32_t aWidth, uint32_t aHeight) {
memset(&mBMPFileHeader, 0, sizeof(mBMPFileHeader));
mBMPFileHeader.signature[0] = 'B';
mBMPFileHeader.signature[1] = 'M';
if (aVersion == VERSION_3) {
mBMPFileHeader.dataoffset = FILE_HEADER_LENGTH + InfoHeaderLength::WIN_V3;
} else { // aVersion == 5
mBMPFileHeader.dataoffset = FILE_HEADER_LENGTH + InfoHeaderLength::WIN_V5;
}
// The color table is present only if BPP is <= 8
if (aBPP <= 8) {
uint32_t numColors = 1 << aBPP;
mBMPFileHeader.dataoffset += 4 * numColors;
CheckedUint32 filesize = CheckedUint32(mBMPFileHeader.dataoffset) +
CheckedUint32(aWidth) * aHeight;
if (MOZ_UNLIKELY(!filesize.isValid())) {
return NS_ERROR_INVALID_ARG;
}
mBMPFileHeader.filesize = filesize.value();
} else {
CheckedUint32 filesize = CheckedUint32(mBMPFileHeader.dataoffset) +
(CheckedUint32(aWidth) * BytesPerPixel(aBPP) +
PaddingBytes(aBPP, aWidth)) *
aHeight;
if (MOZ_UNLIKELY(!filesize.isValid())) {
return NS_ERROR_INVALID_ARG;
}
mBMPFileHeader.filesize = filesize.value();
}
mBMPFileHeader.reserved = 0;
return NS_OK;
}
#define ENCODE(pImageBufferCurr, value) \
memcpy(*pImageBufferCurr, &value, sizeof value); \
*pImageBufferCurr += sizeof value;
// Initializes the bitmap info header mBMPInfoHeader to the passed in values
nsresult nsBMPEncoder::InitInfoHeader(Version aVersion, uint16_t aBPP,
uint32_t aWidth, uint32_t aHeight) {
memset(&mBMPInfoHeader, 0, sizeof(mBMPInfoHeader));
if (aVersion == VERSION_3) {
mBMPInfoHeader.bihsize = InfoHeaderLength::WIN_V3;
} else {
MOZ_ASSERT(aVersion == VERSION_5);
mBMPInfoHeader.bihsize = InfoHeaderLength::WIN_V5;
}
CheckedInt32 width(aWidth);
CheckedInt32 height(aHeight);
if (MOZ_UNLIKELY(!width.isValid() || !height.isValid())) {
return NS_ERROR_INVALID_ARG;
}
mBMPInfoHeader.width = width.value();
mBMPInfoHeader.height = height.value();
mBMPInfoHeader.planes = 1;
mBMPInfoHeader.bpp = aBPP;
mBMPInfoHeader.compression = 0;
mBMPInfoHeader.colors = 0;
mBMPInfoHeader.important_colors = 0;
CheckedUint32 check = CheckedUint32(aWidth) * BytesPerPixel(aBPP);
if (MOZ_UNLIKELY(!check.isValid())) {
return NS_ERROR_INVALID_ARG;
}
if (aBPP <= 8) {
CheckedUint32 imagesize = CheckedUint32(aWidth) * aHeight;
if (MOZ_UNLIKELY(!imagesize.isValid())) {
return NS_ERROR_INVALID_ARG;
}
mBMPInfoHeader.image_size = imagesize.value();
} else {
CheckedUint32 imagesize = (CheckedUint32(aWidth) * BytesPerPixel(aBPP) +
PaddingBytes(aBPP, aWidth)) *
CheckedUint32(aHeight);
if (MOZ_UNLIKELY(!imagesize.isValid())) {
return NS_ERROR_INVALID_ARG;
}
mBMPInfoHeader.image_size = imagesize.value();
}
mBMPInfoHeader.xppm = 0;
mBMPInfoHeader.yppm = 0;
if (aVersion >= VERSION_5) {
mBMPInfoHeader.red_mask = 0x000000FF;
mBMPInfoHeader.green_mask = 0x0000FF00;
mBMPInfoHeader.blue_mask = 0x00FF0000;
mBMPInfoHeader.alpha_mask = 0xFF000000;
mBMPInfoHeader.color_space = V5InfoHeader::COLOR_SPACE_LCS_SRGB;
mBMPInfoHeader.white_point.r.x = 0;
mBMPInfoHeader.white_point.r.y = 0;
mBMPInfoHeader.white_point.r.z = 0;
mBMPInfoHeader.white_point.g.x = 0;
mBMPInfoHeader.white_point.g.y = 0;
mBMPInfoHeader.white_point.g.z = 0;
mBMPInfoHeader.white_point.b.x = 0;
mBMPInfoHeader.white_point.b.y = 0;
mBMPInfoHeader.white_point.b.z = 0;
mBMPInfoHeader.gamma_red = 0;
mBMPInfoHeader.gamma_green = 0;
mBMPInfoHeader.gamma_blue = 0;
mBMPInfoHeader.intent = 0;
mBMPInfoHeader.profile_offset = 0;
mBMPInfoHeader.profile_size = 0;
mBMPInfoHeader.reserved = 0;
}
return NS_OK;
}
// Encodes the BMP file header mBMPFileHeader
void nsBMPEncoder::EncodeFileHeader() {
FileHeader littleEndianBFH = mBMPFileHeader;
NativeEndian::swapToLittleEndianInPlace(&littleEndianBFH.filesize, 1);
NativeEndian::swapToLittleEndianInPlace(&littleEndianBFH.reserved, 1);
NativeEndian::swapToLittleEndianInPlace(&littleEndianBFH.dataoffset, 1);
ENCODE(&mImageBufferCurr, littleEndianBFH.signature);
ENCODE(&mImageBufferCurr, littleEndianBFH.filesize);
ENCODE(&mImageBufferCurr, littleEndianBFH.reserved);
ENCODE(&mImageBufferCurr, littleEndianBFH.dataoffset);
}
// Encodes the BMP info header mBMPInfoHeader
void nsBMPEncoder::EncodeInfoHeader() {
V5InfoHeader littleEndianmBIH = mBMPInfoHeader;
NativeEndian::swapToLittleEndianInPlace(&littleEndianmBIH.bihsize, 1);
NativeEndian::swapToLittleEndianInPlace(&littleEndianmBIH.width, 1);
NativeEndian::swapToLittleEndianInPlace(&littleEndianmBIH.height, 1);
NativeEndian::swapToLittleEndianInPlace(&littleEndianmBIH.planes, 1);
NativeEndian::swapToLittleEndianInPlace(&littleEndianmBIH.bpp, 1);
NativeEndian::swapToLittleEndianInPlace(&littleEndianmBIH.compression, 1);
NativeEndian::swapToLittleEndianInPlace(&littleEndianmBIH.image_size, 1);
NativeEndian::swapToLittleEndianInPlace(&littleEndianmBIH.xppm, 1);
NativeEndian::swapToLittleEndianInPlace(&littleEndianmBIH.yppm, 1);
NativeEndian::swapToLittleEndianInPlace(&littleEndianmBIH.colors, 1);
NativeEndian::swapToLittleEndianInPlace(&littleEndianmBIH.important_colors,
1);
NativeEndian::swapToLittleEndianInPlace(&littleEndianmBIH.red_mask, 1);
NativeEndian::swapToLittleEndianInPlace(&littleEndianmBIH.green_mask, 1);
NativeEndian::swapToLittleEndianInPlace(&littleEndianmBIH.blue_mask, 1);
NativeEndian::swapToLittleEndianInPlace(&littleEndianmBIH.alpha_mask, 1);
NativeEndian::swapToLittleEndianInPlace(&littleEndianmBIH.color_space, 1);
NativeEndian::swapToLittleEndianInPlace(&littleEndianmBIH.white_point.r.x, 1);
NativeEndian::swapToLittleEndianInPlace(&littleEndianmBIH.white_point.r.y, 1);
NativeEndian::swapToLittleEndianInPlace(&littleEndianmBIH.white_point.r.z, 1);
NativeEndian::swapToLittleEndianInPlace(&littleEndianmBIH.white_point.g.x, 1);
NativeEndian::swapToLittleEndianInPlace(&littleEndianmBIH.white_point.g.y, 1);
NativeEndian::swapToLittleEndianInPlace(&littleEndianmBIH.white_point.g.z, 1);
NativeEndian::swapToLittleEndianInPlace(&littleEndianmBIH.white_point.b.x, 1);
NativeEndian::swapToLittleEndianInPlace(&littleEndianmBIH.white_point.b.y, 1);
NativeEndian::swapToLittleEndianInPlace(&littleEndianmBIH.white_point.b.z, 1);
NativeEndian::swapToLittleEndianInPlace(&littleEndianmBIH.gamma_red, 1);
NativeEndian::swapToLittleEndianInPlace(&littleEndianmBIH.gamma_green, 1);
NativeEndian::swapToLittleEndianInPlace(&littleEndianmBIH.gamma_blue, 1);
NativeEndian::swapToLittleEndianInPlace(&littleEndianmBIH.intent, 1);
NativeEndian::swapToLittleEndianInPlace(&littleEndianmBIH.profile_offset, 1);
NativeEndian::swapToLittleEndianInPlace(&littleEndianmBIH.profile_size, 1);
ENCODE(&mImageBufferCurr, littleEndianmBIH.bihsize);
ENCODE(&mImageBufferCurr, littleEndianmBIH.width);
ENCODE(&mImageBufferCurr, littleEndianmBIH.height);
ENCODE(&mImageBufferCurr, littleEndianmBIH.planes);
ENCODE(&mImageBufferCurr, littleEndianmBIH.bpp);
ENCODE(&mImageBufferCurr, littleEndianmBIH.compression);
ENCODE(&mImageBufferCurr, littleEndianmBIH.image_size);
ENCODE(&mImageBufferCurr, littleEndianmBIH.xppm);
ENCODE(&mImageBufferCurr, littleEndianmBIH.yppm);
ENCODE(&mImageBufferCurr, littleEndianmBIH.colors);
ENCODE(&mImageBufferCurr, littleEndianmBIH.important_colors);
if (mBMPInfoHeader.bihsize > InfoHeaderLength::WIN_V3) {
ENCODE(&mImageBufferCurr, littleEndianmBIH.red_mask);
ENCODE(&mImageBufferCurr, littleEndianmBIH.green_mask);
ENCODE(&mImageBufferCurr, littleEndianmBIH.blue_mask);
ENCODE(&mImageBufferCurr, littleEndianmBIH.alpha_mask);
ENCODE(&mImageBufferCurr, littleEndianmBIH.color_space);
ENCODE(&mImageBufferCurr, littleEndianmBIH.white_point.r.x);
ENCODE(&mImageBufferCurr, littleEndianmBIH.white_point.r.y);
ENCODE(&mImageBufferCurr, littleEndianmBIH.white_point.r.z);
ENCODE(&mImageBufferCurr, littleEndianmBIH.white_point.g.x);
ENCODE(&mImageBufferCurr, littleEndianmBIH.white_point.g.y);
ENCODE(&mImageBufferCurr, littleEndianmBIH.white_point.g.z);
ENCODE(&mImageBufferCurr, littleEndianmBIH.white_point.b.x);
ENCODE(&mImageBufferCurr, littleEndianmBIH.white_point.b.y);
ENCODE(&mImageBufferCurr, littleEndianmBIH.white_point.b.z);
ENCODE(&mImageBufferCurr, littleEndianmBIH.gamma_red);
ENCODE(&mImageBufferCurr, littleEndianmBIH.gamma_green);
ENCODE(&mImageBufferCurr, littleEndianmBIH.gamma_blue);
ENCODE(&mImageBufferCurr, littleEndianmBIH.intent);
ENCODE(&mImageBufferCurr, littleEndianmBIH.profile_offset);
ENCODE(&mImageBufferCurr, littleEndianmBIH.profile_size);
ENCODE(&mImageBufferCurr, littleEndianmBIH.reserved);
}
}
// Sets a pixel in the image buffer that doesn't have alpha data
static inline void SetPixel24(uint8_t*& imageBufferCurr, uint8_t aRed,
uint8_t aGreen, uint8_t aBlue) {
*imageBufferCurr = aBlue;
*(imageBufferCurr + 1) = aGreen;
*(imageBufferCurr + 2) = aRed;
}
// Sets a pixel in the image buffer with alpha data
static inline void SetPixel32(uint8_t*& imageBufferCurr, uint8_t aRed,
uint8_t aGreen, uint8_t aBlue,
uint8_t aAlpha = 0xFF) {
*imageBufferCurr = aBlue;
*(imageBufferCurr + 1) = aGreen;
*(imageBufferCurr + 2) = aRed;
*(imageBufferCurr + 3) = aAlpha;
}
// Encodes a row of image data which does not have alpha data
void nsBMPEncoder::EncodeImageDataRow24(const uint8_t* aData) {
for (int32_t x = 0; x < mBMPInfoHeader.width; x++) {
uint32_t pos = x * BytesPerPixel(mBMPInfoHeader.bpp);
SetPixel24(mImageBufferCurr, aData[pos], aData[pos + 1], aData[pos + 2]);
mImageBufferCurr += BytesPerPixel(mBMPInfoHeader.bpp);
}
for (uint32_t x = 0;
x < PaddingBytes(mBMPInfoHeader.bpp, mBMPInfoHeader.width); x++) {
*mImageBufferCurr++ = 0;
}
}
// Encodes a row of image data which does have alpha data
void nsBMPEncoder::EncodeImageDataRow32(const uint8_t* aData) {
for (int32_t x = 0; x < mBMPInfoHeader.width; x++) {
uint32_t pos = x * BytesPerPixel(mBMPInfoHeader.bpp);
SetPixel32(mImageBufferCurr, aData[pos], aData[pos + 1], aData[pos + 2],
aData[pos + 3]);
mImageBufferCurr += 4;
}
for (uint32_t x = 0;
x < PaddingBytes(mBMPInfoHeader.bpp, mBMPInfoHeader.width); x++) {
*mImageBufferCurr++ = 0;
}
}
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