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Enable creating NativeImage from file path

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This commit is contained in:
Cheng Zhao 2015-02-11 18:41:06 +08:00
parent 2876f15063
commit 6556602bdc
4 changed files with 143 additions and 1 deletions
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95
atom/common/api/atom_api_native_image.cc
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@ -4,12 +4,18 @@
#include "atom/common/api/atom_api_native_image.h"
#include "atom/common/native_mate_converters/file_path_converter.h"
#include "atom/common/native_mate_converters/gfx_converter.h"
#include "atom/common/native_mate_converters/image_converter.h"
#include "base/files/file_util.h"
#include "base/strings/string_util.h"
#include "native_mate/constructor.h"
#include "native_mate/dictionary.h"
#include "native_mate/object_template_builder.h"
#include "ui/base/layout.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_util.h"
#include "atom/common/node_includes.h"
@ -20,6 +26,82 @@ namespace api {
namespace {
#if !defined(OS_MACOSX)
struct ScaleFactorPair {
const char* name;
float scale;
};
ScaleFactorPair kScaleFactorPairs[] = {
// The "@2x" is put as first one to make scale matching faster.
{ "@2x" , 2.0f },
{ "@3x" , 3.0f },
{ "@1x" , 1.0f },
{ "@4x" , 4.0f },
{ "@5x" , 5.0f },
{ "@1.25x" , 1.25f },
{ "@1.33x" , 1.33f },
{ "@1.4x" , 1.4f },
{ "@1.5x" , 1.5f },
{ "@1.8x" , 1.8f },
{ "@2.5x" , 2.5f },
};
float GetScaleFactorFromPath(const base::FilePath& path) {
std::string filename(path.BaseName().RemoveExtension().AsUTF8Unsafe());
// We don't try to convert string to float here because it is very very
// expensive.
for (unsigned i = 0; i < arraysize(kScaleFactorPairs); ++i) {
if (EndsWith(filename, kScaleFactorPairs[i].name, true))
return kScaleFactorPairs[i].scale;
}
return 1.0f;
}
bool AddImageSkiaRep(gfx::ImageSkia* image,
const base::FilePath& path,
double scale_factor) {
std::string file_contents;
if (!base::ReadFileToString(path, &file_contents))
return false;
const unsigned char* data =
reinterpret_cast<const unsigned char*>(file_contents.data());
size_t size = file_contents.size();
scoped_ptr<SkBitmap> decoded(new SkBitmap());
// Try PNG first.
if (!gfx::PNGCodec::Decode(data, size, decoded.get()))
// Try JPEG.
decoded.reset(gfx::JPEGCodec::Decode(data, size));
if (!decoded)
return false;
image->AddRepresentation(gfx::ImageSkiaRep(*decoded.release(), scale_factor));
return true;
}
bool PopulateImageSkiaRepsFromPath(gfx::ImageSkia* image,
const base::FilePath& path) {
bool succeed = false;
std::string filename(path.BaseName().RemoveExtension().AsUTF8Unsafe());
if (MatchPattern(filename, "*@*x"))
// Don't search for other representations if the DPI has been specified.
return AddImageSkiaRep(image, path, GetScaleFactorFromPath(path));
else
succeed |= AddImageSkiaRep(image, path, 1.0f);
for (const ScaleFactorPair& pair : kScaleFactorPairs)
succeed |= AddImageSkiaRep(image,
path.InsertBeforeExtensionASCII(pair.name),
pair.scale);
return succeed;
}
#endif // !defined(OS_MACOSX)
v8::Persistent<v8::ObjectTemplate> template_;
} // namespace
@ -89,6 +171,16 @@ mate::Handle<NativeImage> NativeImage::CreateFromJPEG(
return Create(isolate, image);
}
#if !defined(OS_MACOSX)
// static
mate::Handle<NativeImage> NativeImage::CreateFromPath(
v8::Isolate* isolate, const base::FilePath& path) {
gfx::ImageSkia image_skia;
PopulateImageSkiaRepsFromPath(&image_skia, path);
return Create(isolate, gfx::Image(image_skia));
}
#endif // !defined(OS_MACOSX)
} // namespace api
} // namespace atom
@ -101,6 +193,7 @@ void Initialize(v8::Handle<v8::Object> exports, v8::Handle<v8::Value> unused,
mate::Dictionary dict(context->GetIsolate(), exports);
dict.SetMethod("createFromPng", &atom::api::NativeImage::CreateFromPNG);
dict.SetMethod("createFromJpeg", &atom::api::NativeImage::CreateFromJPEG);
dict.SetMethod("createFromPath", &atom::api::NativeImage::CreateFromPath);
}
} // namespace