'../include/private',
'../src/android',
'../src/codec',
+ '../src/core',
],
'sources': [
'../src/android/SkBitmapRegionCanvas.cpp',
],
},
{
- 'target_name': 'get_images_from_skps',
- 'type': 'executable',
- 'sources': [
- '../tools/get_images_from_skps.cpp',
- ],
- 'include_dirs': [
- '../include/private',
- '../src/core',
- ],
- 'dependencies': [
- 'flags.gyp:flags',
- 'skia_lib.gyp:skia_lib',
- ],
+ 'target_name': 'get_images_from_skps',
+ 'type': 'executable',
+ 'sources': [
+ '../tools/get_images_from_skps.cpp',
+ ],
+ 'include_dirs': [
+ '../src/core',
+ '../include/private',
+ ],
+ 'dependencies': [
+ 'flags.gyp:flags',
+ 'skia_lib.gyp:skia_lib',
+ ],
},
{
'target_name': 'gpuveto',
},
'include_dirs': [
'<@(includes_to_test)',
+ '../src/core',
],
'sources': [
# unused_param_test.cpp is generated by the action below.
#include "../private/SkTemplates.h"
#include "SkColor.h"
+#include "SkColorSpace.h"
#include "SkEncodedFormat.h"
#include "SkImageInfo.h"
#include "SkSize.h"
*/
const SkImageInfo& getInfo() const { return fSrcInfo; }
+ /**
+ * Returns the color space associated with the codec.
+ * Does not affect ownership.
+ * Might be NULL.
+ */
+ SkColorSpace* getColorSpace() const { return fColorSpace; }
+
/**
* Return a size that approximately supports the desired scale factor.
* The codec may not be able to scale efficiently to the exact scale
int outputScanline(int inputScanline) const;
protected:
- SkCodec(const SkImageInfo&, SkStream*);
+ /**
+ * Takes ownership of SkStream*
+ * Does not affect ownership of SkColorSpace*
+ */
+ SkCodec(const SkImageInfo&, SkStream*, SkColorSpace* = nullptr);
virtual SkISize onGetScaledDimensions(float /*desiredScale*/) const {
// By default, scaling is not supported.
virtual int onOutputScanline(int inputScanline) const;
private:
- const SkImageInfo fSrcInfo;
- SkAutoTDelete<SkStream> fStream;
- bool fNeedsRewind;
+ const SkImageInfo fSrcInfo;
+ SkAutoTDelete<SkStream> fStream;
+ bool fNeedsRewind;
+ SkAutoTUnref<SkColorSpace> fColorSpace;
+
// These fields are only meaningful during scanline decodes.
- SkImageInfo fDstInfo;
- SkCodec::Options fOptions;
- int fCurrScanline;
+ SkImageInfo fDstInfo;
+ SkCodec::Options fOptions;
+ int fCurrScanline;
/**
* Return whether these dimensions are supported as a scale.
return NewFromStream(new SkMemoryStream(data), reader);
}
-SkCodec::SkCodec(const SkImageInfo& info, SkStream* stream)
+SkCodec::SkCodec(const SkImageInfo& info, SkStream* stream, SkColorSpace* colorSpace)
: fSrcInfo(info)
, fStream(stream)
, fNeedsRewind(false)
+ , fColorSpace(colorSpace ? SkRef(colorSpace) : nullptr)
, fDstInfo()
, fOptions()
, fCurrScanline(-1)
return !png_sig_cmp((png_bytep) buf, (png_size_t)0, bytesRead);
}
+static float png_fixed_point_to_float(png_fixed_point x) {
+ // We multiply by the same factor that libpng used to convert
+ // fixed point -> double. Since we want floats, we choose to
+ // do the conversion ourselves rather than convert
+ // fixed point -> double -> float.
+ return ((float) x) * 0.00001f;
+}
+
+// Returns a colorSpace object that represents any color space information in
+// the encoded data. If the encoded data contains no color space, this will
+// return NULL.
+SkColorSpace* read_color_space(png_structp png_ptr, png_infop info_ptr) {
+
+ // First check for an ICC profile
+ png_bytep profile;
+ png_uint_32 length;
+ // The below variables are unused, however, we need to pass them in anyway or
+ // png_get_iCCP() will return nothing.
+ // Could knowing the |name| of the profile ever be interesting? Maybe for debugging?
+ png_charp name;
+ // The |compression| is uninteresting since:
+ // (1) libpng has already decompressed the profile for us.
+ // (2) "deflate" is the only mode of decompression that libpng supports.
+ int compression;
+ if (PNG_INFO_iCCP == png_get_iCCP(png_ptr, info_ptr, &name, &compression, &profile,
+ &length)) {
+ return SkColorSpace::NewICC(profile, length);
+ }
+
+ // Second, check for sRGB.
+ if (png_get_valid(png_ptr, info_ptr, PNG_INFO_sRGB)) {
+
+ // sRGB chunks also store a rendering intent: Absolute, Relative,
+ // Perceptual, and Saturation.
+ // FIXME (msarett): Extract this information from the sRGB chunk once
+ // we are able to handle this information in
+ // SkColorSpace.
+ return SkColorSpace::NewNamed(SkColorSpace::kSRGB_Named);
+ }
+
+ // Next, check for chromaticities.
+ png_fixed_point XYZ[9];
+ SkFloat3x3 toXYZD50;
+ png_fixed_point gamma;
+ SkFloat3 gammas;
+ if (png_get_cHRM_XYZ_fixed(png_ptr, info_ptr, &XYZ[0], &XYZ[1], &XYZ[2], &XYZ[3], &XYZ[4],
+ &XYZ[5], &XYZ[6], &XYZ[7], &XYZ[8])) {
+
+ // FIXME (msarett): Here we are treating XYZ values as D50 even though the color
+ // temperature is unspecified. I suspect that this assumption
+ // is most often ok, but we could also calculate the color
+ // temperature (D value) and then convert the XYZ to D50. Maybe
+ // we should add a new constructor to SkColorSpace that accepts
+ // XYZ with D-Unkown?
+ for (int i = 0; i < 9; i++) {
+ toXYZD50.fMat[i] = png_fixed_point_to_float(XYZ[i]);
+ }
+
+ if (PNG_INFO_gAMA != png_get_gAMA_fixed(png_ptr, info_ptr, &gamma)) {
+
+ // If the image does not specify gamma, let's choose linear. Should we default
+ // to sRGB? Most images are intended to be sRGB (gamma = 2.2f).
+ gamma = PNG_GAMMA_LINEAR;
+ }
+ gammas.fVec[0] = gammas.fVec[1] = gammas.fVec[2] = png_fixed_point_to_float(gamma);
+
+ return SkColorSpace::NewRGB(toXYZD50, gammas);
+ }
+
+ // Last, check for gamma.
+ if (PNG_INFO_gAMA == png_get_gAMA_fixed(png_ptr, info_ptr, &gamma)) {
+
+ // Guess a default value for cHRM? Or should we just give up?
+ // Here we use the identity matrix as a default.
+ // FIXME (msarett): Should SkFloat3x3 have a method to set the identity matrix?
+ memset(toXYZD50.fMat, 0, 9 * sizeof(float));
+ toXYZD50.fMat[0] = toXYZD50.fMat[4] = toXYZD50.fMat[8] = 1.0f;
+
+ // Set the gammas.
+ gammas.fVec[0] = gammas.fVec[1] = gammas.fVec[2] = png_fixed_point_to_float(gamma);
+
+ return SkColorSpace::NewRGB(toXYZD50, gammas);
+ }
+
+ // Finally, what should we do if there is no color space information in the PNG?
+ // The specification says that this indicates "gamma is unknown" and that the
+ // "color is device dependent". I'm assuming we can represent this with NULL.
+ // But should we guess sRGB? Most images are sRGB, even if they don't specify.
+ return nullptr;
+}
+
// Reads the header and initializes the output fields, if not NULL.
//
// @param stream Input data. Will be read to get enough information to properly
}
SkPngCodec::SkPngCodec(const SkImageInfo& info, SkStream* stream, SkPngChunkReader* chunkReader,
- png_structp png_ptr, png_infop info_ptr, int bitDepth, int numberPasses)
- : INHERITED(info, stream)
+ png_structp png_ptr, png_infop info_ptr, int bitDepth, int numberPasses,
+ SkColorSpace* colorSpace)
+ : INHERITED(info, stream, colorSpace)
, fPngChunkReader(SkSafeRef(chunkReader))
, fPng_ptr(png_ptr)
, fInfo_ptr(info_ptr)
class SkPngScanlineDecoder : public SkPngCodec {
public:
SkPngScanlineDecoder(const SkImageInfo& srcInfo, SkStream* stream,
- SkPngChunkReader* chunkReader, png_structp png_ptr, png_infop info_ptr, int bitDepth)
- : INHERITED(srcInfo, stream, chunkReader, png_ptr, info_ptr, bitDepth, 1)
+ SkPngChunkReader* chunkReader, png_structp png_ptr, png_infop info_ptr, int bitDepth,
+ SkColorSpace* colorSpace)
+ : INHERITED(srcInfo, stream, chunkReader, png_ptr, info_ptr, bitDepth, 1, colorSpace)
, fSrcRow(nullptr)
{}
public:
SkPngInterlacedScanlineDecoder(const SkImageInfo& srcInfo, SkStream* stream,
SkPngChunkReader* chunkReader, png_structp png_ptr, png_infop info_ptr,
- int bitDepth, int numberPasses)
- : INHERITED(srcInfo, stream, chunkReader, png_ptr, info_ptr, bitDepth, numberPasses)
+ int bitDepth, int numberPasses, SkColorSpace* colorSpace)
+ : INHERITED(srcInfo, stream, chunkReader, png_ptr, info_ptr, bitDepth, numberPasses,
+ colorSpace)
, fHeight(-1)
, fCanSkipRewind(false)
{
return nullptr;
}
+ SkAutoTUnref<SkColorSpace> colorSpace(read_color_space(png_ptr, info_ptr));
+
if (1 == numberPasses) {
return new SkPngScanlineDecoder(imageInfo, streamDeleter.detach(), chunkReader,
- png_ptr, info_ptr, bitDepth);
+ png_ptr, info_ptr, bitDepth, colorSpace);
}
return new SkPngInterlacedScanlineDecoder(imageInfo, streamDeleter.detach(), chunkReader,
- png_ptr, info_ptr, bitDepth, numberPasses);
+ png_ptr, info_ptr, bitDepth, numberPasses,
+ colorSpace);
}
return fSwizzler;
}
- SkPngCodec(const SkImageInfo&, SkStream*, SkPngChunkReader*, png_structp, png_infop, int, int);
+ SkPngCodec(const SkImageInfo&, SkStream*, SkPngChunkReader*, png_structp, png_infop, int, int,
+ SkColorSpace*);
png_structp png_ptr() { return fPng_ptr; }
SkSwizzler* swizzler() { return fSwizzler; }
///////////////////////////////////////////////////////////////////////////////////////////////////
+#include "SkFixed.h"
+#include "SkTemplates.h"
+
+#define SkColorSpacePrintf(...)
+
+#define return_if_false(pred, msg) \
+ do { \
+ if (!(pred)) { \
+ SkColorSpacePrintf("Invalid ICC Profile: %s.\n", (msg)); \
+ return false; \
+ } \
+ } while (0)
+
+#define return_null(msg) \
+ do { \
+ SkDebugf("Invalid ICC Profile: %s.\n", (msg)); \
+ return nullptr; \
+ } while (0)
+
+static uint16_t read_big_endian_short(const uint8_t* ptr) {
+ return ptr[0] << 8 | ptr[1];
+}
+
+static uint32_t read_big_endian_int(const uint8_t* ptr) {
+ return ptr[0] << 24 | ptr[1] << 16 | ptr[2] << 8 | ptr[3];
+}
+
+// This is equal to the header size according to the ICC specification (128)
+// plus the size of the tag count (4). We include the tag count since we
+// always require it to be present anyway.
+static const size_t kICCHeaderSize = 132;
+
+// Contains a signature (4), offset (4), and size (4).
+static const size_t kICCTagTableEntrySize = 12;
+
+static const uint32_t kRGB_ColorSpace = SkSetFourByteTag('R', 'G', 'B', ' ');
+static const uint32_t kGray_ColorSpace = SkSetFourByteTag('G', 'R', 'A', 'Y');
+
+struct ICCProfileHeader {
+ // TODO (msarett):
+ // Can we ignore less of these fields?
+ uint32_t fSize;
+ uint32_t fCMMType_ignored;
+ uint32_t fVersion;
+ uint32_t fClassProfile;
+ uint32_t fColorSpace;
+ uint32_t fPCS;
+ uint32_t fDateTime_ignored[3];
+ uint32_t fSignature;
+ uint32_t fPlatformTarget_ignored;
+ uint32_t fFlags_ignored;
+ uint32_t fManufacturer_ignored;
+ uint32_t fDeviceModel_ignored;
+ uint32_t fDeviceAttributes_ignored[2];
+ uint32_t fRenderingIntent;
+ uint32_t fIlluminantXYZ_ignored[3];
+ uint32_t fCreator_ignored;
+ uint32_t fProfileId_ignored[4];
+ uint32_t fReserved_ignored[7];
+ uint32_t fTagCount;
+
+ void init(const uint8_t* src, size_t len) {
+ SkASSERT(kICCHeaderSize == sizeof(*this));
+
+ uint32_t* dst = (uint32_t*) this;
+ for (uint32_t i = 0; i < kICCHeaderSize / 4; i++, src+=4) {
+ dst[i] = read_big_endian_int(src);
+ }
+ }
+
+ bool valid() const {
+ // TODO (msarett):
+ // For now it's nice to fail loudly on invalid inputs. But, can we
+ // recover from some of these errors?
+
+ return_if_false(fSize >= kICCHeaderSize, "Size is too small");
+
+ uint8_t majorVersion = fVersion >> 24;
+ return_if_false(majorVersion <= 4, "Unsupported version");
+
+ const uint32_t kDisplay_Profile = SkSetFourByteTag('m', 'n', 't', 'r');
+ const uint32_t kInput_Profile = SkSetFourByteTag('s', 'c', 'n', 'r');
+ const uint32_t kOutput_Profile = SkSetFourByteTag('p', 'r', 't', 'r');
+ // TODO (msarett):
+ // Should we also support DeviceLink, ColorSpace, Abstract, or NamedColor?
+ return_if_false(fClassProfile == kDisplay_Profile ||
+ fClassProfile == kInput_Profile ||
+ fClassProfile == kOutput_Profile,
+ "Unsupported class profile");
+
+ // TODO (msarett):
+ // There are many more color spaces that we could try to support.
+ return_if_false(fColorSpace == kRGB_ColorSpace || fColorSpace == kGray_ColorSpace,
+ "Unsupported color space");
+
+ const uint32_t kXYZ_PCSSpace = SkSetFourByteTag('X', 'Y', 'Z', ' ');
+ // TODO (msarett):
+ // Can we support PCS LAB as well?
+ return_if_false(fPCS == kXYZ_PCSSpace, "Unsupported PCS space");
+
+ return_if_false(fSignature == SkSetFourByteTag('a', 'c', 's', 'p'), "Bad signature");
+
+ // TODO (msarett):
+ // Should we treat different rendering intents differently?
+ // Valid rendering intents include kPerceptual (0), kRelative (1),
+ // kSaturation (2), and kAbsolute (3).
+ return_if_false(fRenderingIntent <= 3, "Bad rendering intent");
+
+ return_if_false(fTagCount <= 100, "Too many tags");
+
+ return true;
+ }
+};
+
+struct ICCTag {
+ uint32_t fSignature;
+ uint32_t fOffset;
+ uint32_t fLength;
+
+ const uint8_t* init(const uint8_t* src) {
+ fSignature = read_big_endian_int(src);
+ fOffset = read_big_endian_int(src + 4);
+ fLength = read_big_endian_int(src + 8);
+ return src + 12;
+ }
+
+ bool valid(size_t len) {
+ return_if_false(fOffset + fLength <= len, "Tag too large for ICC profile");
+ return true;
+ }
+
+ const uint8_t* addr(const uint8_t* src) const {
+ return src + fOffset;
+ }
+
+ static const ICCTag* Find(const ICCTag tags[], int count, uint32_t signature) {
+ for (int i = 0; i < count; ++i) {
+ if (tags[i].fSignature == signature) {
+ return &tags[i];
+ }
+ }
+ return nullptr;
+ }
+};
+
+// TODO (msarett):
+// Should we recognize more tags?
+static const uint32_t kTAG_rXYZ = SkSetFourByteTag('r', 'X', 'Y', 'Z');
+static const uint32_t kTAG_gXYZ = SkSetFourByteTag('g', 'X', 'Y', 'Z');
+static const uint32_t kTAG_bXYZ = SkSetFourByteTag('b', 'X', 'Y', 'Z');
+static const uint32_t kTAG_rTRC = SkSetFourByteTag('r', 'T', 'R', 'C');
+static const uint32_t kTAG_gTRC = SkSetFourByteTag('g', 'T', 'R', 'C');
+static const uint32_t kTAG_bTRC = SkSetFourByteTag('b', 'T', 'R', 'C');
+
+bool load_xyz(float dst[3], const uint8_t* src, size_t len) {
+ if (len < 20) {
+ SkColorSpacePrintf("XYZ tag is too small (%d bytes)", len);
+ return false;
+ }
+
+ dst[0] = SkFixedToFloat(read_big_endian_int(src + 8));
+ dst[1] = SkFixedToFloat(read_big_endian_int(src + 12));
+ dst[2] = SkFixedToFloat(read_big_endian_int(src + 16));
+ SkColorSpacePrintf("XYZ %g %g %g\n", dst[0], dst[1], dst[2]);
+ return true;
+}
+
+static const uint32_t kTAG_CurveType = SkSetFourByteTag('c', 'u', 'r', 'v');
+static const uint32_t kTAG_ParaCurveType = SkSetFourByteTag('p', 'a', 'r', 'a');
+
+static bool load_gamma(float* gamma, const uint8_t* src, size_t len) {
+ if (len < 14) {
+ SkColorSpacePrintf("gamma tag is too small (%d bytes)", len);
+ return false;
+ }
+
+ uint32_t type = read_big_endian_int(src);
+ switch (type) {
+ case kTAG_CurveType: {
+ uint32_t count = read_big_endian_int(src + 8);
+ if (0 == count) {
+ return false;
+ }
+
+ const uint16_t* table = (const uint16_t*) (src + 12);
+ if (1 == count) {
+ // Table entry is the exponent (bias 256).
+ uint16_t value = read_big_endian_short((const uint8_t*) table);
+ *gamma = value / 256.0f;
+ SkColorSpacePrintf("gamma %d %g\n", value, *gamma);
+ return true;
+ }
+
+ // Check length again if we have a table.
+ if (len < 12 + 2 * count) {
+ SkColorSpacePrintf("gamma tag is too small (%d bytes)", len);
+ return false;
+ }
+
+ // Print the interpolation table. For now, we ignore this and guess 2.2f.
+ for (uint32_t i = 0; i < count; i++) {
+ SkColorSpacePrintf("curve[%d] %d\n", i,
+ read_big_endian_short((const uint8_t*) &table[i]));
+ }
+
+ *gamma = 2.2f;
+ return true;
+ }
+ case kTAG_ParaCurveType:
+ // Guess 2.2f.
+ SkColorSpacePrintf("parametric curve\n");
+ *gamma = 2.2f;
+ return true;
+ default:
+ SkColorSpacePrintf("Unsupported gamma tag type %d\n", type);
+ return false;
+ }
+}
+
+SkColorSpace* SkColorSpace::NewICC(const void* base, size_t len) {
+ const uint8_t* ptr = (const uint8_t*) base;
+
+ if (len < kICCHeaderSize) {
+ return_null("Data is not large enough to contain an ICC profile");
+ }
+
+ // Read the ICC profile header and check to make sure that it is valid.
+ ICCProfileHeader header;
+ header.init(ptr, len);
+ if (!header.valid()) {
+ return nullptr;
+ }
+
+ // Adjust ptr and len before reading the tags.
+ if (len < header.fSize) {
+ SkColorSpacePrintf("ICC profile might be truncated.\n");
+ } else if (len > header.fSize) {
+ SkColorSpacePrintf("Caller provided extra data beyond the end of the ICC profile.\n");
+ len = header.fSize;
+ }
+ ptr += kICCHeaderSize;
+ len -= kICCHeaderSize;
+
+ // Parse tag headers.
+ uint32_t tagCount = header.fTagCount;
+ SkColorSpacePrintf("ICC profile contains %d tags.\n", tagCount);
+ if (len < kICCTagTableEntrySize * tagCount) {
+ return_null("Not enough input data to read tag table entries");
+ }
+
+ SkAutoTArray<ICCTag> tags(tagCount);
+ for (uint32_t i = 0; i < tagCount; i++) {
+ ptr = tags[i].init(ptr);
+ SkColorSpacePrintf("[%d] %c%c%c%c %d %d\n", i, (tags[i].fSignature >> 24) & 0xFF,
+ (tags[i].fSignature >> 16) & 0xFF, (tags[i].fSignature >> 8) & 0xFF,
+ (tags[i].fSignature >> 0) & 0xFF, tags[i].fOffset, tags[i].fLength);
+
+ if (!tags[i].valid(kICCHeaderSize + len)) {
+ return_null("Tag is too large to fit in ICC profile");
+ }
+ }
+
+ // Load our XYZ and gamma matrices.
+ SkFloat3x3 toXYZ;
+ SkFloat3 gamma {{ 1.0f, 1.0f, 1.0f }};
+ switch (header.fColorSpace) {
+ case kRGB_ColorSpace: {
+ const ICCTag* r = ICCTag::Find(tags.get(), tagCount, kTAG_rXYZ);
+ const ICCTag* g = ICCTag::Find(tags.get(), tagCount, kTAG_gXYZ);
+ const ICCTag* b = ICCTag::Find(tags.get(), tagCount, kTAG_bXYZ);
+ if (!r || !g || !b) {
+ return_null("Need rgb tags for XYZ space");
+ }
+
+ if (!load_xyz(&toXYZ.fMat[0], r->addr((const uint8_t*) base), r->fLength) ||
+ !load_xyz(&toXYZ.fMat[3], g->addr((const uint8_t*) base), g->fLength) ||
+ !load_xyz(&toXYZ.fMat[6], b->addr((const uint8_t*) base), b->fLength))
+ {
+ return_null("Need valid rgb tags for XYZ space");
+ }
+
+ r = ICCTag::Find(tags.get(), tagCount, kTAG_rTRC);
+ g = ICCTag::Find(tags.get(), tagCount, kTAG_gTRC);
+ b = ICCTag::Find(tags.get(), tagCount, kTAG_bTRC);
+ if (!r || !load_gamma(&gamma.fVec[0], r->addr((const uint8_t*) base), r->fLength)) {
+ SkColorSpacePrintf("Failed to read R gamma tag.\n");
+ }
+ if (!g || !load_gamma(&gamma.fVec[1], g->addr((const uint8_t*) base), g->fLength)) {
+ SkColorSpacePrintf("Failed to read G gamma tag.\n");
+ }
+ if (!b || !load_gamma(&gamma.fVec[2], b->addr((const uint8_t*) base), b->fLength)) {
+ SkColorSpacePrintf("Failed to read B gamma tag.\n");
+ }
+ return SkColorSpace::NewRGB(toXYZ, gamma);
+ }
+ default:
+ break;
+ }
+
+ return_null("ICC profile contains unsupported colorspace");
+}
+
+///////////////////////////////////////////////////////////////////////////////////////////////////
+
SkColorSpace::Result SkColorSpace::Concat(const SkColorSpace* src, const SkColorSpace* dst,
SkFloat3x3* result) {
if (!src || !dst || (src->named() == kDevice_Named) || (src->named() == dst->named())) {
static SkColorSpace* NewICC(const void*, size_t);
SkFloat3 gamma() const { return fGamma; }
+ SkFloat3x3 xyz() const { return fToXYZD50; }
Named named() const { return fNamed; }
uint32_t uniqueID() const { return fUniqueID; }
--- /dev/null
+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "Resources.h"
+#include "SkCodec.h"
+#include "SkColorSpace.h"
+#include "Test.h"
+
+static SkStreamAsset* resource(const char path[]) {
+ SkString fullPath = GetResourcePath(path);
+ return SkStream::NewFromFile(fullPath.c_str());
+}
+
+static bool almost_equal(float a, float b) {
+ return SkTAbs(a - b) < 0.0001f;
+}
+
+DEF_TEST(ColorSpaceParseICCProfile, r) {
+ SkAutoTDelete<SkStream> stream(resource("color_wheel_with_profile.png"));
+ REPORTER_ASSERT(r, nullptr != stream);
+
+ SkAutoTDelete<SkCodec> codec(SkCodec::NewFromStream(stream.detach()));
+ REPORTER_ASSERT(r, nullptr != codec);
+
+ SkColorSpace* colorSpace = codec->getColorSpace();
+ REPORTER_ASSERT(r, nullptr != colorSpace);
+
+ // No need to use almost equal here. The color profile that we have extracted
+ // actually has a table of gammas. And our current implementation guesses 2.2f.
+ SkFloat3 gammas = colorSpace->gamma();
+ REPORTER_ASSERT(r, 2.2f == gammas.fVec[0]);
+ REPORTER_ASSERT(r, 2.2f == gammas.fVec[1]);
+ REPORTER_ASSERT(r, 2.2f == gammas.fVec[2]);
+
+ // These nine values were extracted from the color profile in isolation (before
+ // we embedded it in the png). Here we check that we still extract the same values.
+ SkFloat3x3 xyz = colorSpace->xyz();
+ REPORTER_ASSERT(r, almost_equal(0.436066f, xyz.fMat[0]));
+ REPORTER_ASSERT(r, almost_equal(0.222488f, xyz.fMat[1]));
+ REPORTER_ASSERT(r, almost_equal(0.013916f, xyz.fMat[2]));
+ REPORTER_ASSERT(r, almost_equal(0.385147f, xyz.fMat[3]));
+ REPORTER_ASSERT(r, almost_equal(0.716873f, xyz.fMat[4]));
+ REPORTER_ASSERT(r, almost_equal(0.0970764f, xyz.fMat[5]));
+ REPORTER_ASSERT(r, almost_equal(0.143066f, xyz.fMat[6]));
+ REPORTER_ASSERT(r, almost_equal(0.0606079f, xyz.fMat[7]));
+ REPORTER_ASSERT(r, almost_equal(0.714096f, xyz.fMat[8]));
+}
projects / platform / upstream / libSkiaSharp.git / commitdiff
