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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkEncodedInfo_DEFINED
#define SkEncodedInfo_DEFINED
#include "SkData.h"
#include "SkImageInfo.h"
#include "../../third_party/skcms/skcms.h"
struct SkEncodedInfo {
public:
class ICCProfile {
public:
static std::unique_ptr<ICCProfile> Make(sk_sp<SkData>);
static std::unique_ptr<ICCProfile> Make(const skcms_ICCProfile&);
const skcms_ICCProfile* profile() const { return &fProfile; }
private:
ICCProfile(const skcms_ICCProfile&, sk_sp<SkData> = nullptr);
skcms_ICCProfile fProfile;
sk_sp<SkData> fData;
};
enum Alpha {
kOpaque_Alpha,
kUnpremul_Alpha,
// Each pixel is either fully opaque or fully transparent.
// There is no difference between requesting kPremul or kUnpremul.
kBinary_Alpha,
};
/*
* We strive to make the number of components per pixel obvious through
* our naming conventions.
* Ex: kRGB has 3 components. kRGBA has 4 components.
*
* This sometimes results in redundant Alpha and Color information.
* Ex: kRGB images must also be kOpaque.
*/
enum Color {
// PNG, WBMP
kGray_Color,
// PNG
kGrayAlpha_Color,
// PNG with Skia-specific sBIT
// Like kGrayAlpha, except this expects to be treated as
// kAlpha_8_SkColorType, which ignores the gray component. If
// decoded to full color (e.g. kN32), the gray component is respected
// (so it can share code with kGrayAlpha).
kXAlpha_Color,
// PNG
// 565 images may be encoded to PNG by specifying the number of
// significant bits for each channel. This is a strange 565
// representation because the image is still encoded with 8 bits per
// component.
k565_Color,
// PNG, GIF, BMP
kPalette_Color,
// PNG, RAW
kRGB_Color,
kRGBA_Color,
// BMP
kBGR_Color,
kBGRX_Color,
kBGRA_Color,
// JPEG, WEBP
kYUV_Color,
// WEBP
kYUVA_Color,
// JPEG
// Photoshop actually writes inverted CMYK data into JPEGs, where zero
// represents 100% ink coverage. For this reason, we treat CMYK JPEGs
// as having inverted CMYK. libjpeg-turbo warns that this may break
// other applications, but the CMYK JPEGs we see on the web expect to
// be treated as inverted CMYK.
kInvertedCMYK_Color,
kYCCK_Color,
};
static SkEncodedInfo Make(int width, int height, Color color, Alpha alpha,
int bitsPerComponent) {
return Make(width, height, color, alpha, bitsPerComponent, nullptr);
}
static SkEncodedInfo Make(int width, int height, Color color, Alpha alpha,
int bitsPerComponent, std::unique_ptr<ICCProfile> profile) {
SkASSERT(1 == bitsPerComponent ||
2 == bitsPerComponent ||
4 == bitsPerComponent ||
8 == bitsPerComponent ||
16 == bitsPerComponent);
switch (color) {
case kGray_Color:
SkASSERT(kOpaque_Alpha == alpha);
break;
case kGrayAlpha_Color:
SkASSERT(kOpaque_Alpha != alpha);
break;
case kPalette_Color:
SkASSERT(16 != bitsPerComponent);
break;
case kRGB_Color:
case kBGR_Color:
case kBGRX_Color:
SkASSERT(kOpaque_Alpha == alpha);
SkASSERT(bitsPerComponent >= 8);
break;
case kYUV_Color:
case kInvertedCMYK_Color:
case kYCCK_Color:
SkASSERT(kOpaque_Alpha == alpha);
SkASSERT(8 == bitsPerComponent);
break;
case kRGBA_Color:
SkASSERT(kOpaque_Alpha != alpha);
SkASSERT(bitsPerComponent >= 8);
break;
case kBGRA_Color:
case kYUVA_Color:
SkASSERT(kOpaque_Alpha != alpha);
SkASSERT(8 == bitsPerComponent);
break;
case kXAlpha_Color:
SkASSERT(kUnpremul_Alpha == alpha);
SkASSERT(8 == bitsPerComponent);
break;
case k565_Color:
SkASSERT(kOpaque_Alpha == alpha);
SkASSERT(8 == bitsPerComponent);
break;
default:
SkASSERT(false);
break;
}
return SkEncodedInfo(width, height, color, alpha, bitsPerComponent, std::move(profile));
}
/*
* Returns a recommended SkImageInfo.
*
* TODO: Leave this up to the client.
*/
SkImageInfo makeImageInfo() const {
auto ct = kGray_Color == fColor ? kGray_8_SkColorType :
kXAlpha_Color == fColor ? kAlpha_8_SkColorType :
k565_Color == fColor ? kRGB_565_SkColorType :
kN32_SkColorType ;
auto alpha = kOpaque_Alpha == fAlpha ? kOpaque_SkAlphaType
: kUnpremul_SkAlphaType;
sk_sp<SkColorSpace> cs = fProfile ? SkColorSpace::Make(*fProfile->profile())
: nullptr;
if (!cs) {
cs = SkColorSpace::MakeSRGB();
}
return SkImageInfo::Make(fWidth, fHeight, ct, alpha, std::move(cs));
}
int width() const { return fWidth; }
int height() const { return fHeight; }
Color color() const { return fColor; }
Alpha alpha() const { return fAlpha; }
bool opaque() const { return fAlpha == kOpaque_Alpha; }
const skcms_ICCProfile* profile() const {
if (!fProfile) return nullptr;
return fProfile->profile();
}
uint8_t bitsPerComponent() const { return fBitsPerComponent; }
uint8_t bitsPerPixel() const {
switch (fColor) {
case kGray_Color:
return fBitsPerComponent;
case kXAlpha_Color:
case kGrayAlpha_Color:
return 2 * fBitsPerComponent;
case kPalette_Color:
return fBitsPerComponent;
case kRGB_Color:
case kBGR_Color:
case kYUV_Color:
case k565_Color:
return 3 * fBitsPerComponent;
case kRGBA_Color:
case kBGRA_Color:
case kBGRX_Color:
case kYUVA_Color:
case kInvertedCMYK_Color:
case kYCCK_Color:
return 4 * fBitsPerComponent;
default:
SkASSERT(false);
return 0;
}
}
SkEncodedInfo(const SkEncodedInfo& orig) = delete;
SkEncodedInfo& operator=(const SkEncodedInfo&) = delete;
SkEncodedInfo(SkEncodedInfo&& orig) = default;
SkEncodedInfo& operator=(SkEncodedInfo&&) = default;
// Explicit copy method, to avoid accidental copying.
SkEncodedInfo copy() const {
auto copy = SkEncodedInfo::Make(fWidth, fHeight, fColor, fAlpha, fBitsPerComponent);
if (fProfile) {
copy.fProfile.reset(new ICCProfile(*fProfile.get()));
}
return copy;
}
private:
SkEncodedInfo(int width, int height, Color color, Alpha alpha,
uint8_t bitsPerComponent, std::unique_ptr<ICCProfile> profile)
: fWidth(width)
, fHeight(height)
, fColor(color)
, fAlpha(alpha)
, fBitsPerComponent(bitsPerComponent)
, fProfile(std::move(profile))
{}
int fWidth;
int fHeight;
Color fColor;
Alpha fAlpha;
uint8_t fBitsPerComponent;
std::unique_ptr<ICCProfile> fProfile;
};
#endif