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electron_api_native_image.cc
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// Copyright (c) 2015 GitHub, Inc.
// Use of this source code is governed by the MIT license that can be
// found in the LICENSE file.
#include "shell/common/api/electron_api_native_image.h"
#include <memory>
#include <string>
#include <utility>
#include <vector>
#include "base/files/file_util.h"
#include "base/logging.h"
#include "base/strings/pattern.h"
#include "base/strings/string_util.h"
#include "base/strings/utf_string_conversions.h"
#include "base/threading/thread_restrictions.h"
#include "gin/arguments.h"
#include "gin/object_template_builder.h"
#include "gin/per_isolate_data.h"
#include "gin/wrappable.h"
#include "net/base/data_url.h"
#include "shell/common/asar/asar_util.h"
#include "shell/common/gin_converters/file_path_converter.h"
#include "shell/common/gin_converters/gfx_converter.h"
#include "shell/common/gin_converters/gurl_converter.h"
#include "shell/common/gin_converters/value_converter.h"
#include "shell/common/gin_helper/dictionary.h"
#include "shell/common/gin_helper/function_template_extensions.h"
#include "shell/common/gin_helper/object_template_builder.h"
#include "shell/common/node_includes.h"
#include "shell/common/skia_util.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "third_party/skia/include/core/SkImageInfo.h"
#include "third_party/skia/include/core/SkPixelRef.h"
#include "ui/base/layout.h"
#include "ui/base/webui/web_ui_util.h"
#include "ui/gfx/codec/jpeg_codec.h"
#include "ui/gfx/codec/png_codec.h"
#include "ui/gfx/geometry/size.h"
#include "ui/gfx/image/image_skia.h"
#include "ui/gfx/image/image_skia_operations.h"
#include "ui/gfx/image/image_util.h"
#if defined(OS_WIN)
#include "base/win/scoped_gdi_object.h"
#include "shell/common/asar/archive.h"
#include "ui/gfx/icon_util.h"
#endif
namespace electron {
namespace api {
namespace {
// Get the scale factor from options object at the first argument
float GetScaleFactorFromOptions(gin::Arguments* args) {
float scale_factor = 1.0f;
gin_helper::Dictionary options;
if (args->GetNext(&options))
options.Get("scaleFactor", &scale_factor);
return scale_factor;
}
base::FilePath NormalizePath(const base::FilePath& path) {
if (!path.ReferencesParent()) {
return path;
}
base::ThreadRestrictions::ScopedAllowIO allow_blocking;
base::FilePath absolute_path = MakeAbsoluteFilePath(path);
// MakeAbsoluteFilePath returns an empty path on failures so use original path
if (absolute_path.empty()) {
return path;
} else {
return absolute_path;
}
}
#if defined(OS_MAC)
bool IsTemplateFilename(const base::FilePath& path) {
return (base::MatchPattern(path.value(), "*Template.*") ||
base::MatchPattern(path.value(), "*Template@*x.*"));
}
#endif
#if defined(OS_WIN)
base::win::ScopedHICON ReadICOFromPath(int size, const base::FilePath& path) {
// If file is in asar archive, we extract it to a temp file so LoadImage can
// load it.
base::FilePath asar_path, relative_path;
base::FilePath image_path(path);
if (asar::GetAsarArchivePath(image_path, &asar_path, &relative_path)) {
std::shared_ptr<asar::Archive> archive =
asar::GetOrCreateAsarArchive(asar_path);
if (archive)
archive->CopyFileOut(relative_path, &image_path);
}
// Load the icon from file.
return base::win::ScopedHICON(
static_cast<HICON>(LoadImage(NULL, image_path.value().c_str(), IMAGE_ICON,
size, size, LR_LOADFROMFILE)));
}
#endif
} // namespace
NativeImage::NativeImage(v8::Isolate* isolate, const gfx::Image& image)
: image_(image), isolate_(isolate) {
if (image_.HasRepresentation(gfx::Image::kImageRepSkia)) {
auto* const image_skia = image_.ToImageSkia();
if (!image_skia->isNull()) {
isolate_->AdjustAmountOfExternalAllocatedMemory(
image_skia->bitmap()->computeByteSize());
}
}
}
#if defined(OS_WIN)
NativeImage::NativeImage(v8::Isolate* isolate, const base::FilePath& hicon_path)
: hicon_path_(hicon_path), isolate_(isolate) {
// Use the 256x256 icon as fallback icon.
gfx::ImageSkia image_skia;
electron::util::ReadImageSkiaFromICO(&image_skia, GetHICON(256));
image_ = gfx::Image(image_skia);
if (image_.HasRepresentation(gfx::Image::kImageRepSkia)) {
if (!image_skia.isNull()) {
isolate_->AdjustAmountOfExternalAllocatedMemory(
image_.ToImageSkia()->bitmap()->computeByteSize());
}
}
}
#endif
NativeImage::~NativeImage() {
if (image_.HasRepresentation(gfx::Image::kImageRepSkia)) {
auto* const image_skia = image_.ToImageSkia();
if (!image_skia->isNull()) {
isolate_->AdjustAmountOfExternalAllocatedMemory(
image_skia->bitmap()->computeByteSize());
}
}
}
// static
bool NativeImage::TryConvertNativeImage(v8::Isolate* isolate,
v8::Local<v8::Value> image,
NativeImage** native_image,
OnConvertError on_error) {
std::string error_message;
base::FilePath icon_path;
if (gin::ConvertFromV8(isolate, image, &icon_path)) {
*native_image = NativeImage::CreateFromPath(isolate, icon_path).get();
if ((*native_image)->image().IsEmpty()) {
#if defined(OS_WIN)
const auto img_path = base::UTF16ToUTF8(icon_path.value());
#else
const auto img_path = icon_path.value();
#endif
error_message = "Failed to load image from path '" + img_path + "'";
}
} else {
if (!gin::ConvertFromV8(isolate, image, native_image)) {
error_message = "Argument must be a file path or a NativeImage";
}
}
if (!error_message.empty()) {
switch (on_error) {
case OnConvertError::kThrow:
isolate->ThrowException(
v8::Exception::Error(gin::StringToV8(isolate, error_message)));
break;
case OnConvertError::kWarn:
LOG(WARNING) << error_message;
break;
}
return false;
}
return true;
}
#if defined(OS_WIN)
HICON NativeImage::GetHICON(int size) {
auto iter = hicons_.find(size);
if (iter != hicons_.end())
return iter->second.get();
// First try loading the icon with specified size.
if (!hicon_path_.empty()) {
hicons_[size] = ReadICOFromPath(size, hicon_path_);
return hicons_[size].get();
}
// Then convert the image to ICO.
if (image_.IsEmpty())
return NULL;
hicons_[size] = IconUtil::CreateHICONFromSkBitmap(image_.AsBitmap());
return hicons_[size].get();
}
#endif
v8::Local<v8::Value> NativeImage::ToPNG(gin::Arguments* args) {
float scale_factor = GetScaleFactorFromOptions(args);
if (scale_factor == 1.0f) {
// Use raw 1x PNG bytes when available
scoped_refptr<base::RefCountedMemory> png = image_.As1xPNGBytes();
if (png->size() > 0) {
const char* data = reinterpret_cast<const char*>(png->front());
size_t size = png->size();
return node::Buffer::Copy(args->isolate(), data, size).ToLocalChecked();
}
}
const SkBitmap bitmap =
image_.AsImageSkia().GetRepresentation(scale_factor).GetBitmap();
std::vector<unsigned char> encoded;
gfx::PNGCodec::EncodeBGRASkBitmap(bitmap, false, &encoded);
const char* data = reinterpret_cast<char*>(encoded.data());
size_t size = encoded.size();
return node::Buffer::Copy(args->isolate(), data, size).ToLocalChecked();
}
v8::Local<v8::Value> NativeImage::ToBitmap(gin::Arguments* args) {
float scale_factor = GetScaleFactorFromOptions(args);
const SkBitmap bitmap =
image_.AsImageSkia().GetRepresentation(scale_factor).GetBitmap();
SkImageInfo info =
SkImageInfo::MakeN32Premul(bitmap.width(), bitmap.height());
auto array_buffer =
v8::ArrayBuffer::New(args->isolate(), info.computeMinByteSize());
auto backing_store = array_buffer->GetBackingStore();
if (bitmap.readPixels(info, backing_store->Data(), info.minRowBytes(), 0,
0)) {
return node::Buffer::New(args->isolate(), array_buffer, 0,
info.computeMinByteSize())
.ToLocalChecked();
}
return node::Buffer::New(args->isolate(), 0).ToLocalChecked();
}
v8::Local<v8::Value> NativeImage::ToJPEG(v8::Isolate* isolate, int quality) {
std::vector<unsigned char> output;
gfx::JPEG1xEncodedDataFromImage(image_, quality, &output);
if (output.empty())
return node::Buffer::New(isolate, 0).ToLocalChecked();
return node::Buffer::Copy(isolate,
reinterpret_cast<const char*>(&output.front()),
output.size())
.ToLocalChecked();
}
std::string NativeImage::ToDataURL(gin::Arguments* args) {
float scale_factor = GetScaleFactorFromOptions(args);
if (scale_factor == 1.0f) {
// Use raw 1x PNG bytes when available
scoped_refptr<base::RefCountedMemory> png = image_.As1xPNGBytes();
if (png->size() > 0)
return webui::GetPngDataUrl(png->front(), png->size());
}
return webui::GetBitmapDataUrl(
image_.AsImageSkia().GetRepresentation(scale_factor).GetBitmap());
}
void SkUnref(char* data, void* hint) {
reinterpret_cast<SkRefCnt*>(hint)->unref();
}
v8::Local<v8::Value> NativeImage::GetBitmap(gin::Arguments* args) {
float scale_factor = GetScaleFactorFromOptions(args);
const SkBitmap bitmap =
image_.AsImageSkia().GetRepresentation(scale_factor).GetBitmap();
SkPixelRef* ref = bitmap.pixelRef();
if (!ref)
return node::Buffer::New(args->isolate(), 0).ToLocalChecked();
ref->ref();
return node::Buffer::New(args->isolate(),
reinterpret_cast<char*>(ref->pixels()),
bitmap.computeByteSize(), &SkUnref, ref)
.ToLocalChecked();
}
v8::Local<v8::Value> NativeImage::GetNativeHandle(
gin_helper::ErrorThrower thrower) {
#if defined(OS_MAC)
if (IsEmpty())
return node::Buffer::New(thrower.isolate(), 0).ToLocalChecked();
NSImage* ptr = image_.AsNSImage();
return node::Buffer::Copy(thrower.isolate(), reinterpret_cast<char*>(ptr),
sizeof(void*))
.ToLocalChecked();
#else
thrower.ThrowError("Not implemented");
return v8::Undefined(thrower.isolate());
#endif
}
bool NativeImage::IsEmpty() {
return image_.IsEmpty();
}
gfx::Size NativeImage::GetSize(const base::Optional<float> scale_factor) {
float sf = scale_factor.value_or(1.0f);
gfx::ImageSkiaRep image_rep = image_.AsImageSkia().GetRepresentation(sf);
return gfx::Size(image_rep.GetWidth(), image_rep.GetHeight());
}
std::vector<float> NativeImage::GetScaleFactors() {
gfx::ImageSkia image_skia = image_.AsImageSkia();
std::vector<float> scale_factors;
for (const auto& rep : image_skia.image_reps()) {
scale_factors.push_back(rep.scale());
}
return scale_factors;
}
float NativeImage::GetAspectRatio(const base::Optional<float> scale_factor) {
float sf = scale_factor.value_or(1.0f);
gfx::Size size = GetSize(sf);
if (size.IsEmpty())
return 1.f;
else
return static_cast<float>(size.width()) / static_cast<float>(size.height());
}
gin::Handle<NativeImage> NativeImage::Resize(gin::Arguments* args,
base::DictionaryValue options) {
float scale_factor = GetScaleFactorFromOptions(args);
gfx::Size size = GetSize(scale_factor);
int width = size.width();
int height = size.height();
bool width_set = options.GetInteger("width", &width);
bool height_set = options.GetInteger("height", &height);
size.SetSize(width, height);
if (width <= 0 && height <= 0) {
return CreateEmpty(args->isolate());
} else if (width_set && !height_set) {
// Scale height to preserve original aspect ratio
size.set_height(width);
size =
gfx::ScaleToRoundedSize(size, 1.f, 1.f / GetAspectRatio(scale_factor));
} else if (height_set && !width_set) {
// Scale width to preserve original aspect ratio
size.set_width(height);
size = gfx::ScaleToRoundedSize(size, GetAspectRatio(scale_factor), 1.f);
}
skia::ImageOperations::ResizeMethod method =
skia::ImageOperations::ResizeMethod::RESIZE_BEST;
std::string quality;
options.GetString("quality", &quality);
if (quality == "good")
method = skia::ImageOperations::ResizeMethod::RESIZE_GOOD;
else if (quality == "better")
method = skia::ImageOperations::ResizeMethod::RESIZE_BETTER;
gfx::ImageSkia resized = gfx::ImageSkiaOperations::CreateResizedImage(
image_.AsImageSkia(), method, size);
return gin::CreateHandle(
args->isolate(), new NativeImage(args->isolate(), gfx::Image(resized)));
}
gin::Handle<NativeImage> NativeImage::Crop(v8::Isolate* isolate,
const gfx::Rect& rect) {
gfx::ImageSkia cropped =
gfx::ImageSkiaOperations::ExtractSubset(image_.AsImageSkia(), rect);
return gin::CreateHandle(isolate,
new NativeImage(isolate, gfx::Image(cropped)));
}
void NativeImage::AddRepresentation(const gin_helper::Dictionary& options) {
int width = 0;
int height = 0;
float scale_factor = 1.0f;
options.Get("width", &width);
options.Get("height", &height);
options.Get("scaleFactor", &scale_factor);
bool skia_rep_added = false;
gfx::ImageSkia image_skia = image_.AsImageSkia();
v8::Local<v8::Value> buffer;
GURL url;
if (options.Get("buffer", &buffer) && node::Buffer::HasInstance(buffer)) {
auto* data = reinterpret_cast<unsigned char*>(node::Buffer::Data(buffer));
auto size = node::Buffer::Length(buffer);
skia_rep_added = electron::util::AddImageSkiaRepFromBuffer(
&image_skia, data, size, width, height, scale_factor);
} else if (options.Get("dataURL", &url)) {
std::string mime_type, charset, data;
if (net::DataURL::Parse(url, &mime_type, &charset, &data)) {
auto* data_ptr = reinterpret_cast<const unsigned char*>(data.c_str());
if (mime_type == "image/png") {
skia_rep_added = electron::util::AddImageSkiaRepFromPNG(
&image_skia, data_ptr, data.size(), scale_factor);
} else if (mime_type == "image/jpeg") {
skia_rep_added = electron::util::AddImageSkiaRepFromJPEG(
&image_skia, data_ptr, data.size(), scale_factor);
}
}
}
// Re-initialize image when first representation is added to an empty image
if (skia_rep_added && IsEmpty()) {
gfx::Image image(image_skia);
image_ = std::move(image);
}
}
#if !defined(OS_MAC)
void NativeImage::SetTemplateImage(bool setAsTemplate) {}
bool NativeImage::IsTemplateImage() {
return false;
}
#endif
// static
gin::Handle<NativeImage> NativeImage::CreateEmpty(v8::Isolate* isolate) {
return gin::CreateHandle(isolate, new NativeImage(isolate, gfx::Image()));
}
// static
gin::Handle<NativeImage> NativeImage::Create(v8::Isolate* isolate,
const gfx::Image& image) {
return gin::CreateHandle(isolate, new NativeImage(isolate, image));
}
// static
gin::Handle<NativeImage> NativeImage::CreateFromPNG(v8::Isolate* isolate,
const char* buffer,
size_t length) {
gfx::ImageSkia image_skia;
electron::util::AddImageSkiaRepFromPNG(
&image_skia, reinterpret_cast<const unsigned char*>(buffer), length, 1.0);
return Create(isolate, gfx::Image(image_skia));
}
// static
gin::Handle<NativeImage> NativeImage::CreateFromJPEG(v8::Isolate* isolate,
const char* buffer,
size_t length) {
gfx::ImageSkia image_skia;
electron::util::AddImageSkiaRepFromJPEG(
&image_skia, reinterpret_cast<const unsigned char*>(buffer), length, 1.0);
return Create(isolate, gfx::Image(image_skia));
}
// static
gin::Handle<NativeImage> NativeImage::CreateFromPath(
v8::Isolate* isolate,
const base::FilePath& path) {
base::FilePath image_path = NormalizePath(path);
#if defined(OS_WIN)
if (image_path.MatchesExtension(FILE_PATH_LITERAL(".ico"))) {
return gin::CreateHandle(isolate, new NativeImage(isolate, image_path));
}
#endif
gfx::ImageSkia image_skia;
electron::util::PopulateImageSkiaRepsFromPath(&image_skia, image_path);
gfx::Image image(image_skia);
gin::Handle<NativeImage> handle = Create(isolate, image);
#if defined(OS_MAC)
if (IsTemplateFilename(image_path))
handle->SetTemplateImage(true);
#endif
return handle;
}
// static
gin::Handle<NativeImage> NativeImage::CreateFromBitmap(
gin_helper::ErrorThrower thrower,
v8::Local<v8::Value> buffer,
const gin_helper::Dictionary& options) {
if (!node::Buffer::HasInstance(buffer)) {
thrower.ThrowError("buffer must be a node Buffer");
return gin::Handle<NativeImage>();
}
unsigned int width = 0;
unsigned int height = 0;
double scale_factor = 1.;
if (!options.Get("width", &width)) {
thrower.ThrowError("width is required");
return gin::Handle<NativeImage>();
}
if (!options.Get("height", &height)) {
thrower.ThrowError("height is required");
return gin::Handle<NativeImage>();
}
auto info = SkImageInfo::MakeN32(width, height, kPremul_SkAlphaType);
auto size_bytes = info.computeMinByteSize();
if (size_bytes != node::Buffer::Length(buffer)) {
thrower.ThrowError("invalid buffer size");
return gin::Handle<NativeImage>();
}
options.Get("scaleFactor", &scale_factor);
if (width == 0 || height == 0) {
return CreateEmpty(thrower.isolate());
}
SkBitmap bitmap;
bitmap.allocN32Pixels(width, height, false);
bitmap.writePixels({info, node::Buffer::Data(buffer), bitmap.rowBytes()});
gfx::ImageSkia image_skia =
gfx::ImageSkia::CreateFromBitmap(bitmap, scale_factor);
return Create(thrower.isolate(), gfx::Image(image_skia));
}
// static
gin::Handle<NativeImage> NativeImage::CreateFromBuffer(
gin_helper::ErrorThrower thrower,
v8::Local<v8::Value> buffer,
gin::Arguments* args) {
if (!node::Buffer::HasInstance(buffer)) {
thrower.ThrowError("buffer must be a node Buffer");
return gin::Handle<NativeImage>();
}
int width = 0;
int height = 0;
double scale_factor = 1.;
gin_helper::Dictionary options;
if (args->GetNext(&options)) {
options.Get("width", &width);
options.Get("height", &height);
options.Get("scaleFactor", &scale_factor);
}
gfx::ImageSkia image_skia;
electron::util::AddImageSkiaRepFromBuffer(
&image_skia, reinterpret_cast<unsigned char*>(node::Buffer::Data(buffer)),
node::Buffer::Length(buffer), width, height, scale_factor);
return Create(args->isolate(), gfx::Image(image_skia));
}
// static
gin::Handle<NativeImage> NativeImage::CreateFromDataURL(v8::Isolate* isolate,
const GURL& url) {
std::string mime_type, charset, data;
if (net::DataURL::Parse(url, &mime_type, &charset, &data)) {
if (mime_type == "image/png")
return CreateFromPNG(isolate, data.c_str(), data.size());
else if (mime_type == "image/jpeg")
return CreateFromJPEG(isolate, data.c_str(), data.size());
}
return CreateEmpty(isolate);
}
#if !defined(OS_MAC)
gin::Handle<NativeImage> NativeImage::CreateFromNamedImage(gin::Arguments* args,
std::string name) {
return CreateEmpty(args->isolate());
}
#endif
// static
gin::ObjectTemplateBuilder NativeImage::GetObjectTemplateBuilder(
v8::Isolate* isolate) {
gin::PerIsolateData* data = gin::PerIsolateData::From(isolate);
auto* wrapper_info = &kWrapperInfo;
v8::Local<v8::FunctionTemplate> constructor =
data->GetFunctionTemplate(wrapper_info);
if (constructor.IsEmpty()) {
constructor = v8::FunctionTemplate::New(isolate);
constructor->SetClassName(gin::StringToV8(isolate, GetTypeName()));
data->SetFunctionTemplate(wrapper_info, constructor);
}
return gin::ObjectTemplateBuilder(isolate, GetTypeName(),
constructor->InstanceTemplate())
.SetMethod("toPNG", &NativeImage::ToPNG)
.SetMethod("toJPEG", &NativeImage::ToJPEG)
.SetMethod("toBitmap", &NativeImage::ToBitmap)
.SetMethod("getBitmap", &NativeImage::GetBitmap)
.SetMethod("getScaleFactors", &NativeImage::GetScaleFactors)
.SetMethod("getNativeHandle", &NativeImage::GetNativeHandle)
.SetMethod("toDataURL", &NativeImage::ToDataURL)
.SetMethod("isEmpty", &NativeImage::IsEmpty)
.SetMethod("getSize", &NativeImage::GetSize)
.SetMethod("setTemplateImage", &NativeImage::SetTemplateImage)
.SetMethod("isTemplateImage", &NativeImage::IsTemplateImage)
.SetProperty("isMacTemplateImage", &NativeImage::IsTemplateImage,
&NativeImage::SetTemplateImage)
.SetMethod("resize", &NativeImage::Resize)
.SetMethod("crop", &NativeImage::Crop)
.SetMethod("getAspectRatio", &NativeImage::GetAspectRatio)
.SetMethod("addRepresentation", &NativeImage::AddRepresentation);
}
const char* NativeImage::GetTypeName() {
return "NativeImage";
}
// static
gin::WrapperInfo NativeImage::kWrapperInfo = {gin::kEmbedderNativeGin};
} // namespace api
} // namespace electron
namespace {
using electron::api::NativeImage;
void Initialize(v8::Local<v8::Object> exports,
v8::Local<v8::Value> unused,
v8::Local<v8::Context> context,
void* priv) {
v8::Isolate* isolate = context->GetIsolate();
gin_helper::Dictionary dict(isolate, exports);
gin_helper::Dictionary native_image = gin::Dictionary::CreateEmpty(isolate);
dict.Set("nativeImage", native_image);
native_image.SetMethod("createEmpty", &NativeImage::CreateEmpty);
native_image.SetMethod("createFromPath", &NativeImage::CreateFromPath);
native_image.SetMethod("createFromBitmap", &NativeImage::CreateFromBitmap);
native_image.SetMethod("createFromBuffer", &NativeImage::CreateFromBuffer);
native_image.SetMethod("createFromDataURL", &NativeImage::CreateFromDataURL);
native_image.SetMethod("createFromNamedImage",
&NativeImage::CreateFromNamedImage);
#if !defined(OS_LINUX)
native_image.SetMethod("createThumbnailFromPath",
&NativeImage::CreateThumbnailFromPath);
#endif
}
} // namespace
NODE_LINKED_MODULE_CONTEXT_AWARE(electron_common_native_image, Initialize)