Enable creating NativeImage from file path
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2876f15063
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4 changed files with 143 additions and 1 deletions
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@ -4,12 +4,18 @@
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#include "atom/common/api/atom_api_native_image.h"
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#include "atom/common/native_mate_converters/file_path_converter.h"
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#include "atom/common/native_mate_converters/gfx_converter.h"
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#include "atom/common/native_mate_converters/image_converter.h"
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#include "base/files/file_util.h"
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#include "base/strings/string_util.h"
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#include "native_mate/constructor.h"
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#include "native_mate/dictionary.h"
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#include "native_mate/object_template_builder.h"
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#include "ui/base/layout.h"
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#include "ui/gfx/codec/jpeg_codec.h"
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#include "ui/gfx/codec/png_codec.h"
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#include "ui/gfx/geometry/size.h"
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#include "ui/gfx/image/image_skia.h"
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#include "ui/gfx/image/image_util.h"
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#include "atom/common/node_includes.h"
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@ -20,6 +26,82 @@ namespace api {
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namespace {
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#if !defined(OS_MACOSX)
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struct ScaleFactorPair {
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const char* name;
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float scale;
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};
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ScaleFactorPair kScaleFactorPairs[] = {
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// The "@2x" is put as first one to make scale matching faster.
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{ "@2x" , 2.0f },
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{ "@3x" , 3.0f },
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{ "@1x" , 1.0f },
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{ "@4x" , 4.0f },
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{ "@5x" , 5.0f },
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{ "@1.25x" , 1.25f },
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{ "@1.33x" , 1.33f },
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{ "@1.4x" , 1.4f },
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{ "@1.5x" , 1.5f },
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{ "@1.8x" , 1.8f },
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{ "@2.5x" , 2.5f },
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};
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float GetScaleFactorFromPath(const base::FilePath& path) {
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std::string filename(path.BaseName().RemoveExtension().AsUTF8Unsafe());
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// We don't try to convert string to float here because it is very very
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// expensive.
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for (unsigned i = 0; i < arraysize(kScaleFactorPairs); ++i) {
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if (EndsWith(filename, kScaleFactorPairs[i].name, true))
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return kScaleFactorPairs[i].scale;
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}
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return 1.0f;
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}
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bool AddImageSkiaRep(gfx::ImageSkia* image,
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const base::FilePath& path,
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double scale_factor) {
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std::string file_contents;
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if (!base::ReadFileToString(path, &file_contents))
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return false;
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const unsigned char* data =
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reinterpret_cast<const unsigned char*>(file_contents.data());
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size_t size = file_contents.size();
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scoped_ptr<SkBitmap> decoded(new SkBitmap());
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// Try PNG first.
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if (!gfx::PNGCodec::Decode(data, size, decoded.get()))
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// Try JPEG.
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decoded.reset(gfx::JPEGCodec::Decode(data, size));
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if (!decoded)
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return false;
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image->AddRepresentation(gfx::ImageSkiaRep(*decoded.release(), scale_factor));
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return true;
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}
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bool PopulateImageSkiaRepsFromPath(gfx::ImageSkia* image,
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const base::FilePath& path) {
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bool succeed = false;
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std::string filename(path.BaseName().RemoveExtension().AsUTF8Unsafe());
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if (MatchPattern(filename, "*@*x"))
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// Don't search for other representations if the DPI has been specified.
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return AddImageSkiaRep(image, path, GetScaleFactorFromPath(path));
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else
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succeed |= AddImageSkiaRep(image, path, 1.0f);
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for (const ScaleFactorPair& pair : kScaleFactorPairs)
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succeed |= AddImageSkiaRep(image,
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path.InsertBeforeExtensionASCII(pair.name),
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pair.scale);
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return succeed;
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}
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#endif // !defined(OS_MACOSX)
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v8::Persistent<v8::ObjectTemplate> template_;
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} // namespace
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@ -89,6 +171,16 @@ mate::Handle<NativeImage> NativeImage::CreateFromJPEG(
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return Create(isolate, image);
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}
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#if !defined(OS_MACOSX)
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// static
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mate::Handle<NativeImage> NativeImage::CreateFromPath(
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v8::Isolate* isolate, const base::FilePath& path) {
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gfx::ImageSkia image_skia;
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PopulateImageSkiaRepsFromPath(&image_skia, path);
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return Create(isolate, gfx::Image(image_skia));
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}
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#endif // !defined(OS_MACOSX)
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} // namespace api
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} // namespace atom
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@ -101,6 +193,7 @@ void Initialize(v8::Handle<v8::Object> exports, v8::Handle<v8::Value> unused,
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mate::Dictionary dict(context->GetIsolate(), exports);
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dict.SetMethod("createFromPng", &atom::api::NativeImage::CreateFromPNG);
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dict.SetMethod("createFromJpeg", &atom::api::NativeImage::CreateFromJPEG);
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dict.SetMethod("createFromPath", &atom::api::NativeImage::CreateFromPath);
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}
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} // namespace
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