skia2/include/core/SkImageInfo.h
reed 2bdf1f56c3 Revert of Add gamma/sRGB tag to SkImageInfo (patchset #1 id:1 of https://codereview.chromium.org/527073003/)
Reason for revert:
virtual gpu failures in layouttests

http://build.chromium.org/p/tryserver.blink/builders/linux_blink_dbg/builds/23717

[6:6:0903/041147:1700960503:INFO:SkBitmap.cpp(1003)] ../../third_party/skia/src/core/SkBitmap.cpp:1003: failed assertion "fPixelRef->info() == pixelRef->info()"

[6:6:0903/041147:1700961002:FATAL:SkBitmap.cpp(1003)] SK_CRASH
#0 0x7f9867df2c1e base::debug::StackTrace::StackTrace()
#1 0x7f9867e89e05 logging::LogMessage::~LogMessage()
#2 0x7f98689c4970 SkDebugf_FileLine()
#3 0x7f986870ebc6 SkBitmap::deepCopyTo()
#4 0x7f98690a3b6d blink::deepSkBitmapCopy()
#5 0x7f98690a3abe blink::ImageBuffer::copyImage()
#6 0x7f985fd4479e blink::ImageBitmap::ImageBitmap()
#7 0x7f985fd45942 blink::ImageBitmap::create()
#8 0x7f985fd84fdc blink::ImageBitmapFactories::createImageBitmap()
#9 0x7f985fd84d11 blink::ImageBitmapFactories::createImageBitmap()
#10 0x7f985ec9a7f2 blink::LocalDOMWindowV8Internal::createImageBitmap13Method()
#11 0x7f985ec96b0c blink::LocalDOMWindowV8Internal::createImageBitmapMethod()
#12 0x7f985ec91954 blink::LocalDOMWindowV8Internal::createImageBitmapMethodCallback()
#13 0x7f9869955af0 v8::internal::FunctionCallbackArguments::Call()
#14 0x7f98699833bd v8::internal::Builtin_HandleApiCall()

Original issue's description:
> Add gamma/sRGB tag to SkImageInfo
>
> This reverts commit 1cbc68f965.
>
> requires this to land in blink https://codereview.chromium.org/531883002/
>
> Committed: https://skia.googlesource.com/skia/+/2f6abdecc5c2f21da13003c615903679abc73fc7

R=fmalita@google.com, reed@chromium.org
TBR=fmalita@google.com, reed@chromium.org
NOTREECHECKS=true
NOTRY=true

Author: reed@google.com

Review URL: https://codereview.chromium.org/535113002
2014-09-03 05:48:56 -07:00

262 lines
7.4 KiB
C++

/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkImageInfo_DEFINED
#define SkImageInfo_DEFINED
#include "SkMath.h"
#include "SkSize.h"
class SkWriteBuffer;
class SkReadBuffer;
/**
* Describes how to interpret the alpha compoent of a pixel.
*/
enum SkAlphaType {
/**
* All pixels should be treated as opaque, regardless of the value stored
* in their alpha field. Used for legacy images that wrote 0 or garbarge
* in their alpha field, but intended the RGB to be treated as opaque.
*/
kIgnore_SkAlphaType,
/**
* All pixels are stored as opaque. This differs slightly from kIgnore in
* that kOpaque has correct "opaque" values stored in the pixels, while
* kIgnore may not, but in both cases the caller should treat the pixels
* as opaque.
*/
kOpaque_SkAlphaType,
/**
* All pixels have their alpha premultiplied in their color components.
* This is the natural format for the rendering target pixels.
*/
kPremul_SkAlphaType,
/**
* All pixels have their color components stored without any regard to the
* alpha. e.g. this is the default configuration for PNG images.
*
* This alpha-type is ONLY supported for input images. Rendering cannot
* generate this on output.
*/
kUnpremul_SkAlphaType,
kLastEnum_SkAlphaType = kUnpremul_SkAlphaType
};
static inline bool SkAlphaTypeIsOpaque(SkAlphaType at) {
SK_COMPILE_ASSERT(kIgnore_SkAlphaType < kOpaque_SkAlphaType, bad_alphatype_order);
SK_COMPILE_ASSERT(kPremul_SkAlphaType > kOpaque_SkAlphaType, bad_alphatype_order);
SK_COMPILE_ASSERT(kUnpremul_SkAlphaType > kOpaque_SkAlphaType, bad_alphatype_order);
return (unsigned)at <= kOpaque_SkAlphaType;
}
static inline bool SkAlphaTypeIsValid(unsigned value) {
return value <= kLastEnum_SkAlphaType;
}
///////////////////////////////////////////////////////////////////////////////
/**
* Describes how to interpret the components of a pixel.
*
* kN32_SkColorType is an alias for whichever 32bit ARGB format is the "native"
* form for skia's blitters. Use this if you don't have a swizzle preference
* for 32bit pixels.
*/
enum SkColorType {
kUnknown_SkColorType,
kAlpha_8_SkColorType,
kRGB_565_SkColorType,
kARGB_4444_SkColorType,
kRGBA_8888_SkColorType,
kBGRA_8888_SkColorType,
kIndex_8_SkColorType,
kLastEnum_SkColorType = kIndex_8_SkColorType,
#if SK_PMCOLOR_BYTE_ORDER(B,G,R,A)
kN32_SkColorType = kBGRA_8888_SkColorType,
#elif SK_PMCOLOR_BYTE_ORDER(R,G,B,A)
kN32_SkColorType = kRGBA_8888_SkColorType,
#else
#error "SK_*32_SHFIT values must correspond to BGRA or RGBA byte order"
#endif
#ifdef SK_SUPPORT_LEGACY_N32_NAME
kPMColor_SkColorType = kN32_SkColorType
#endif
};
static int SkColorTypeBytesPerPixel(SkColorType ct) {
static const uint8_t gSize[] = {
0, // Unknown
1, // Alpha_8
2, // RGB_565
2, // ARGB_4444
4, // RGBA_8888
4, // BGRA_8888
1, // kIndex_8
};
SK_COMPILE_ASSERT(SK_ARRAY_COUNT(gSize) == (size_t)(kLastEnum_SkColorType + 1),
size_mismatch_with_SkColorType_enum);
SkASSERT((size_t)ct < SK_ARRAY_COUNT(gSize));
return gSize[ct];
}
static inline size_t SkColorTypeMinRowBytes(SkColorType ct, int width) {
return width * SkColorTypeBytesPerPixel(ct);
}
static inline bool SkColorTypeIsValid(unsigned value) {
return value <= kLastEnum_SkColorType;
}
///////////////////////////////////////////////////////////////////////////////
/**
* Return true if alphaType is supported by colorType. If there is a canonical
* alphaType for this colorType, return it in canonical.
*/
bool SkColorTypeValidateAlphaType(SkColorType colorType, SkAlphaType alphaType,
SkAlphaType* canonical = NULL);
///////////////////////////////////////////////////////////////////////////////
/**
* Describe an image's dimensions and pixel type.
*/
struct SkImageInfo {
int fWidth;
int fHeight;
SkColorType fColorType;
SkAlphaType fAlphaType;
static SkImageInfo Make(int width, int height, SkColorType ct, SkAlphaType at) {
SkImageInfo info = {
width, height, ct, at
};
return info;
}
/**
* Sets colortype to the native ARGB32 type.
*/
static SkImageInfo MakeN32(int width, int height, SkAlphaType at) {
SkImageInfo info = {
width, height, kN32_SkColorType, at
};
return info;
}
/**
* Sets colortype to the native ARGB32 type, and the alphatype to premul.
*/
static SkImageInfo MakeN32Premul(int width, int height) {
SkImageInfo info = {
width, height, kN32_SkColorType, kPremul_SkAlphaType
};
return info;
}
/**
* Sets colortype to the native ARGB32 type, and the alphatype to premul.
*/
static SkImageInfo MakeN32Premul(const SkISize& size) {
return MakeN32Premul(size.width(), size.height());
}
static SkImageInfo MakeA8(int width, int height) {
SkImageInfo info = {
width, height, kAlpha_8_SkColorType, kPremul_SkAlphaType
};
return info;
}
static SkImageInfo MakeUnknown(int width, int height) {
SkImageInfo info = {
width, height, kUnknown_SkColorType, kIgnore_SkAlphaType
};
return info;
}
static SkImageInfo MakeUnknown() {
SkImageInfo info = {
0, 0, kUnknown_SkColorType, kIgnore_SkAlphaType
};
return info;
}
int width() const { return fWidth; }
int height() const { return fHeight; }
SkColorType colorType() const { return fColorType; }
SkAlphaType alphaType() const { return fAlphaType; }
bool isEmpty() const { return fWidth <= 0 || fHeight <= 0; }
bool isOpaque() const {
return SkAlphaTypeIsOpaque(fAlphaType);
}
SkISize dimensions() const { return SkISize::Make(fWidth, fHeight); }
/**
* Return a new ImageInfo with the same colortype and alphatype as this info,
* but with the specified width and height.
*/
SkImageInfo makeWH(int newWidth, int newHeight) const {
return SkImageInfo::Make(newWidth, newHeight, fColorType, fAlphaType);
}
int bytesPerPixel() const {
return SkColorTypeBytesPerPixel(fColorType);
}
uint64_t minRowBytes64() const {
return sk_64_mul(fWidth, this->bytesPerPixel());
}
size_t minRowBytes() const {
return (size_t)this->minRowBytes64();
}
bool operator==(const SkImageInfo& other) const {
return 0 == memcmp(this, &other, sizeof(other));
}
bool operator!=(const SkImageInfo& other) const {
return 0 != memcmp(this, &other, sizeof(other));
}
void unflatten(SkReadBuffer&);
void flatten(SkWriteBuffer&) const;
int64_t getSafeSize64(size_t rowBytes) const {
if (0 == fHeight) {
return 0;
}
return sk_64_mul(fHeight - 1, rowBytes) + fWidth * this->bytesPerPixel();
}
size_t getSafeSize(size_t rowBytes) const {
return (size_t)this->getSafeSize64(rowBytes);
}
bool validRowBytes(size_t rowBytes) const {
uint64_t rb = sk_64_mul(fWidth, this->bytesPerPixel());
return rowBytes >= rb;
}
SkDEBUGCODE(void validate() const;)
};
#endif