Introduce SkGammas type to represent ICC gamma curves
BUG=skia: GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1928123002 Committed: https://skia.googlesource.com/skia/+/7b2c6dd8c918209cb92e1338905d511c68da3eb2 Review-Url: https://codereview.chromium.org/1928123002
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msarett
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@ -210,7 +210,7 @@ sk_sp<SkColorSpace> read_color_space(png_structp png_ptr, png_infop info_ptr) {
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png_fixed_point XYZ[9];
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SkFloat3x3 toXYZD50;
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png_fixed_point gamma;
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SkFloat3 gammas;
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SkColorSpace::SkGammas gammas;
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if (png_get_cHRM_XYZ_fixed(png_ptr, info_ptr, &XYZ[0], &XYZ[1], &XYZ[2], &XYZ[3], &XYZ[4],
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&XYZ[5], &XYZ[6], &XYZ[7], &XYZ[8])) {
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@ -225,16 +225,17 @@ sk_sp<SkColorSpace> read_color_space(png_structp png_ptr, png_infop info_ptr) {
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}
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if (PNG_INFO_gAMA == png_get_gAMA_fixed(png_ptr, info_ptr, &gamma)) {
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gammas.fVec[0] = gammas.fVec[1] = gammas.fVec[2] =
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png_inverted_fixed_point_to_float(gamma);
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float value = png_inverted_fixed_point_to_float(gamma);
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gammas = SkColorSpace::SkGammas(value, value, value);
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} else {
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// If the image does not specify gamma, let's choose linear. Should we default
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// to sRGB? Most images are intended to be sRGB (gamma = 2.2f).
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gammas.fVec[0] = gammas.fVec[1] = gammas.fVec[2] = 1.0f;
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// Default to sRGB (gamma = 2.2f) if the image has color space information,
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// but does not specify gamma.
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gammas = SkColorSpace::SkGammas(2.2f, 2.2f, 2.2f);
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}
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return SkColorSpace::NewRGB(toXYZD50, gammas);
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return SkColorSpace::NewRGB(toXYZD50, std::move(gammas));
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}
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// Last, check for gamma.
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@ -247,9 +248,10 @@ sk_sp<SkColorSpace> read_color_space(png_structp png_ptr, png_infop info_ptr) {
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toXYZD50.fMat[0] = toXYZD50.fMat[4] = toXYZD50.fMat[8] = 1.0f;
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// Set the gammas.
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gammas.fVec[0] = gammas.fVec[1] = gammas.fVec[2] = png_inverted_fixed_point_to_float(gamma);
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float value = png_inverted_fixed_point_to_float(gamma);
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gammas = SkColorSpace::SkGammas(value, value, value);
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return SkColorSpace::NewRGB(toXYZD50, gammas);
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return SkColorSpace::NewRGB(toXYZD50, std::move(gammas));
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}
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#endif // LIBPNG >= 1.6
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@ -23,29 +23,28 @@ void SkFloat3x3::dump() const {
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static int32_t gUniqueColorSpaceID;
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SkColorSpace::SkColorSpace(const SkFloat3& gamma, const SkFloat3x3& toXYZD50, Named named)
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: fGamma(gamma)
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SkColorSpace::SkColorSpace(SkGammas gammas, const SkFloat3x3& toXYZD50, Named named)
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: fGammas(std::move(gammas))
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, fToXYZD50(toXYZD50)
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, fToXYZOffset({{ 0.0f, 0.0f, 0.0f }})
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, fUniqueID(sk_atomic_inc(&gUniqueColorSpaceID))
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, fNamed(named)
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{}
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SkColorSpace::SkColorSpace(SkColorLookUpTable colorLUT, const SkFloat3& gamma,
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SkColorSpace::SkColorSpace(SkColorLookUpTable colorLUT, SkGammas gammas,
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const SkFloat3x3& toXYZD50, const SkFloat3& toXYZOffset)
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: fColorLUT(std::move(colorLUT))
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, fGamma(gamma)
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, fGammas(std::move(gammas))
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, fToXYZD50(toXYZD50)
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, fToXYZOffset(toXYZOffset)
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, fUniqueID(sk_atomic_inc(&gUniqueColorSpaceID))
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, fNamed(kUnknown_Named)
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{}
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sk_sp<SkColorSpace> SkColorSpace::NewRGB(const SkFloat3x3& toXYZD50, const SkFloat3& gamma) {
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return sk_sp<SkColorSpace>(new SkColorSpace(gamma, toXYZD50, kUnknown_Named));
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sk_sp<SkColorSpace> SkColorSpace::NewRGB(const SkFloat3x3& toXYZD50, SkGammas gammas) {
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return sk_sp<SkColorSpace>(new SkColorSpace(std::move(gammas), toXYZD50, kUnknown_Named));
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}
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const SkFloat3 gSRGB_gamma {{ 2.2f, 2.2f, 2.2f }};
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const SkFloat3x3 gSRGB_toXYZD50 {{
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0.4358f, 0.2224f, 0.0139f, // * R
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0.3853f, 0.7170f, 0.0971f, // * G
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@ -55,7 +54,8 @@ const SkFloat3x3 gSRGB_toXYZD50 {{
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sk_sp<SkColorSpace> SkColorSpace::NewNamed(Named named) {
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switch (named) {
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case kSRGB_Named:
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return sk_sp<SkColorSpace>(new SkColorSpace(gSRGB_gamma, gSRGB_toXYZD50, kSRGB_Named));
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return sk_sp<SkColorSpace>(new SkColorSpace(SkGammas(2.2f, 2.2f, 2.2f), gSRGB_toXYZD50,
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kSRGB_Named));
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default:
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break;
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}
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@ -264,9 +264,8 @@ bool load_xyz(float dst[3], const uint8_t* src, size_t len) {
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static const uint32_t kTAG_CurveType = SkSetFourByteTag('c', 'u', 'r', 'v');
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static const uint32_t kTAG_ParaCurveType = SkSetFourByteTag('p', 'a', 'r', 'a');
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// FIXME (msarett):
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// We need to handle the possibility that the gamma curve does not correspond to 2.2f.
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static bool load_gammas(float* gammas, uint32_t numGammas, const uint8_t* src, size_t len) {
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bool SkColorSpace::LoadGammas(SkGammaCurve* gammas, uint32_t numGammas, const uint8_t* src,
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size_t len) {
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for (uint32_t i = 0; i < numGammas; i++) {
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if (len < 12) {
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// FIXME (msarett):
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@ -289,7 +288,7 @@ static bool load_gammas(float* gammas, uint32_t numGammas, const uint8_t* src, s
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// Some tags require a gamma curve, but the author doesn't actually want
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// to transform the data. In this case, it is common to see a curve with
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// a count of 0.
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gammas[i] = 1.0f;
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gammas[i].fValue = 1.0f;
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break;
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} else if (len < 12 + 2 * count) {
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SkColorSpacePrintf("gamma tag is too small (%d bytes)", len);
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@ -298,27 +297,31 @@ static bool load_gammas(float* gammas, uint32_t numGammas, const uint8_t* src, s
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const uint16_t* table = (const uint16_t*) (src + 12);
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if (1 == count) {
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// Table entry is the exponent (bias 256).
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// The table entry is the gamma (with a bias of 256).
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uint16_t value = read_big_endian_short((const uint8_t*) table);
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gammas[i] = value / 256.0f;
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gammas[i].fValue = value / 256.0f;
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SkColorSpacePrintf("gamma %d %g\n", value, *gamma);
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break;
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}
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// Print the interpolation table. For now, we ignore this and guess 2.2f.
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// Fill in the interpolation table.
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// FIXME (msarett):
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// We should recognize commonly occurring tables and just set gamma to 2.2f.
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gammas[i].fTableSize = count;
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gammas[i].fTable = std::unique_ptr<float[]>(new float[count]);
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for (uint32_t j = 0; j < count; j++) {
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SkColorSpacePrintf("curve[%d] %d\n", j,
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read_big_endian_short((const uint8_t*) &table[j]));
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gammas[i].fTable[j] =
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(read_big_endian_short((const uint8_t*) &table[j])) / 65535.0f;
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}
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gammas[i] = 2.2f;
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break;
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}
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case kTAG_ParaCurveType:
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// Guess 2.2f.
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// FIXME (msarett): Handle parametric curves.
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SkColorSpacePrintf("parametric curve\n");
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gammas[i] = 2.2f;
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gammas[i].fValue = 2.2f;
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// Determine the size of the parametric curve tag.
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switch(read_big_endian_short(src + 8)) {
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case 0:
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tagBytes = 12 + 4;
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@ -358,28 +361,19 @@ static bool load_gammas(float* gammas, uint32_t numGammas, const uint8_t* src, s
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}
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}
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// If all of the gammas we encounter are 1.0f, indicate that we failed to load gammas.
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// There is no need to apply a gamma of 1.0f.
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for (uint32_t i = 0; i < numGammas; i++) {
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if (1.0f != gammas[i]) {
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return true;
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}
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}
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return false;
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}
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static const uint32_t kTAG_AtoBType = SkSetFourByteTag('m', 'A', 'B', ' ');
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bool load_color_lut(SkColorLookUpTable* colorLUT, uint32_t inputChannels, uint32_t outputChannels,
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const uint8_t* src, size_t len) {
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bool SkColorSpace::LoadColorLUT(SkColorLookUpTable* colorLUT, uint32_t inputChannels,
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uint32_t outputChannels, const uint8_t* src, size_t len) {
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if (len < 20) {
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SkColorSpacePrintf("Color LUT tag is too small (%d bytes).", len);
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return false;
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}
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SkASSERT(inputChannels <= SkColorLookUpTable::kMaxChannels &&
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outputChannels <= SkColorLookUpTable::kMaxChannels);
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SkASSERT(inputChannels <= SkColorLookUpTable::kMaxChannels && 3 == outputChannels);
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colorLUT->fInputChannels = inputChannels;
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colorLUT->fOutputChannels = outputChannels;
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uint32_t numEntries = 1;
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@ -441,7 +435,7 @@ bool load_matrix(SkFloat3x3* toXYZ, SkFloat3* toXYZOffset, const uint8_t* src, s
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return true;
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}
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bool load_a2b0(SkColorLookUpTable* colorLUT, SkFloat3* gamma, SkFloat3x3* toXYZ,
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bool SkColorSpace::LoadA2B0(SkColorLookUpTable* colorLUT, SkGammas* gammas, SkFloat3x3* toXYZ,
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SkFloat3* toXYZOffset, const uint8_t* src, size_t len) {
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if (len < 32) {
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SkColorSpacePrintf("A to B tag is too small (%d bytes).", len);
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@ -460,7 +454,7 @@ bool load_a2b0(SkColorLookUpTable* colorLUT, SkFloat3* gamma, SkFloat3x3* toXYZ,
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uint8_t inputChannels = src[8];
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uint8_t outputChannels = src[9];
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if (0 == inputChannels || inputChannels > SkColorLookUpTable::kMaxChannels ||
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0 < outputChannels || outputChannels > SkColorLookUpTable::kMaxChannels) {
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3 != outputChannels) {
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// The color LUT assumes that there are at most 16 input channels. For RGB
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// profiles, output channels should be 3.
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SkColorSpacePrintf("Too many input or output channels in A to B tag.\n");
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@ -483,16 +477,16 @@ bool load_a2b0(SkColorLookUpTable* colorLUT, SkFloat3* gamma, SkFloat3x3* toXYZ,
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uint32_t offsetToColorLUT = read_big_endian_int(src + 24);
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if (0 != offsetToColorLUT && offsetToColorLUT < len) {
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if (!load_color_lut(colorLUT, inputChannels, outputChannels, src + offsetToColorLUT,
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len - offsetToColorLUT)) {
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if (!SkColorSpace::LoadColorLUT(colorLUT, inputChannels, outputChannels,
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src + offsetToColorLUT, len - offsetToColorLUT)) {
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SkColorSpacePrintf("Failed to read color LUT from A to B tag.\n");
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}
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}
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uint32_t offsetToMCurves = read_big_endian_int(src + 20);
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if (0 != offsetToMCurves && offsetToMCurves < len) {
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if (!load_gammas(gamma->fVec, outputChannels, src + offsetToMCurves, len - offsetToMCurves))
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{
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if (!SkColorSpace::LoadGammas(&gammas->fRed, outputChannels, src + offsetToMCurves,
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len - offsetToMCurves)) {
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SkColorSpacePrintf("Failed to read M curves from A to B tag.\n");
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}
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}
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@ -567,42 +561,39 @@ sk_sp<SkColorSpace> SkColorSpace::NewICC(const void* base, size_t len) {
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// It is not uncommon to see missing or empty gamma tags. This indicates
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// that we should use unit gamma.
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SkFloat3 gamma {{ 1.0f, 1.0f, 1.0f }};
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SkGammas gammas;
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r = ICCTag::Find(tags.get(), tagCount, kTAG_rTRC);
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g = ICCTag::Find(tags.get(), tagCount, kTAG_gTRC);
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b = ICCTag::Find(tags.get(), tagCount, kTAG_bTRC);
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if (!r ||
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!load_gammas(&gamma.fVec[0], 1, r->addr((const uint8_t*) base), r->fLength))
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{
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if (!r || !SkColorSpace::LoadGammas(&gammas.fRed, 1,
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r->addr((const uint8_t*) base), r->fLength)) {
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SkColorSpacePrintf("Failed to read R gamma tag.\n");
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}
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if (!g ||
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!load_gammas(&gamma.fVec[1], 1, g->addr((const uint8_t*) base), g->fLength))
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{
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if (!g || !SkColorSpace::LoadGammas(&gammas.fGreen, 1,
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g->addr((const uint8_t*) base), g->fLength)) {
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SkColorSpacePrintf("Failed to read G gamma tag.\n");
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}
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if (!b ||
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!load_gammas(&gamma.fVec[2], 1, b->addr((const uint8_t*) base), b->fLength))
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{
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if (!b || !SkColorSpace::LoadGammas(&gammas.fBlue, 1,
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b->addr((const uint8_t*) base), b->fLength)) {
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SkColorSpacePrintf("Failed to read B gamma tag.\n");
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}
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return SkColorSpace::NewRGB(toXYZ, gamma);
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return SkColorSpace::NewRGB(toXYZ, std::move(gammas));
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}
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// Recognize color profile specified by A2B0 tag.
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const ICCTag* a2b0 = ICCTag::Find(tags.get(), tagCount, kTAG_A2B0);
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if (a2b0) {
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SkColorLookUpTable colorLUT;
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SkFloat3 gamma;
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SkGammas gammas;
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SkFloat3x3 toXYZ;
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SkFloat3 toXYZOffset;
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if (!load_a2b0(&colorLUT, &gamma, &toXYZ, &toXYZOffset,
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if (!SkColorSpace::LoadA2B0(&colorLUT, &gammas, &toXYZ, &toXYZOffset,
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a2b0->addr((const uint8_t*) base), a2b0->fLength)) {
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return_null("Failed to parse A2B0 tag");
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}
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return sk_sp<SkColorSpace>(new SkColorSpace(std::move(colorLUT), gamma, toXYZ,
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toXYZOffset));
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return sk_sp<SkColorSpace>(new SkColorSpace(std::move(colorLUT), std::move(gammas),
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toXYZ, toXYZOffset));
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}
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}
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@ -35,6 +35,46 @@ struct SkFloat3x3 {
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void dump() const;
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};
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class SkColorSpace : public SkRefCnt {
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private:
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struct SkGammaCurve {
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bool isValue() const {
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bool result = (0.0f != fValue);
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SkASSERT(!result || (0 == fTableSize));
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return result;
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}
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bool isTable() const {
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bool result = (0 != fTableSize);
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SkASSERT(!result || (0.0f == fValue));
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SkASSERT(!result || fTable);
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return result;
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}
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bool isParametric() const { return false; }
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// We have three different ways to represent gamma.
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// (1) A single value:
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float fValue;
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// (2) A lookup table:
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uint32_t fTableSize;
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std::unique_ptr<float[]> fTable;
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// (3) Parameters for a curve:
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// FIXME (msarett): Handle parametric curves.
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SkGammaCurve() {
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memset(this, 0, sizeof(struct SkGammaCurve));
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}
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SkGammaCurve(float value)
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: fValue(value)
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, fTableSize(0)
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, fTable(nullptr)
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{}
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};
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struct SkColorLookUpTable {
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static const uint8_t kMaxChannels = 16;
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@ -46,46 +86,70 @@ struct SkColorLookUpTable {
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SkColorLookUpTable() {
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memset(this, 0, sizeof(struct SkColorLookUpTable));
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}
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SkColorLookUpTable(SkColorLookUpTable&& that)
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: fInputChannels(that.fInputChannels)
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, fOutputChannels(that.fOutputChannels)
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, fTable(std::move(that.fTable))
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{
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memcpy(fGridPoints, that.fGridPoints, kMaxChannels);
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}
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};
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class SkColorSpace : public SkRefCnt {
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public:
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enum Named {
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kUnknown_Named,
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kSRGB_Named,
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};
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struct SkGammas {
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public:
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SkGammas(float red, float green, float blue)
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: fRed(red)
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, fGreen(green)
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, fBlue(blue)
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{}
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SkGammas() {}
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SkDEBUGCODE(float red() const { return fRed.fValue; })
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SkDEBUGCODE(float green() const { return fGreen.fValue; })
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SkDEBUGCODE(float blue() const { return fBlue.fValue; })
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private:
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SkGammaCurve fRed;
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SkGammaCurve fGreen;
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SkGammaCurve fBlue;
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friend class SkColorSpace;
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};
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/**
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* Return a colorspace instance, given a 3x3 transform from linear_RGB to D50_XYZ
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* and the src-gamma, return a ColorSpace
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*/
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static sk_sp<SkColorSpace> NewRGB(const SkFloat3x3& toXYZD50, const SkFloat3& gamma);
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static sk_sp<SkColorSpace> NewRGB(const SkFloat3x3& toXYZD50, SkGammas gammas);
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static sk_sp<SkColorSpace> NewNamed(Named);
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static sk_sp<SkColorSpace> NewICC(const void*, size_t);
|
||||
|
||||
SkFloat3 gamma() const { return fGamma; }
|
||||
const SkGammas& gammas() const { return fGammas; }
|
||||
SkFloat3x3 xyz() const { return fToXYZD50; }
|
||||
SkFloat3 xyzOffset() const { return fToXYZOffset; }
|
||||
Named named() const { return fNamed; }
|
||||
uint32_t uniqueID() const { return fUniqueID; }
|
||||
|
||||
private:
|
||||
SkColorSpace(const SkFloat3& gamma, const SkFloat3x3& toXYZ, Named);
|
||||
|
||||
SkColorSpace(SkColorLookUpTable colorLUT, const SkFloat3& gamma, const SkFloat3x3& toXYZ,
|
||||
const SkFloat3& toXYZOffset);
|
||||
static bool LoadGammas(SkGammaCurve* gammas, uint32_t num, const uint8_t* src, size_t len);
|
||||
|
||||
|
||||
static bool LoadColorLUT(SkColorLookUpTable* colorLUT, uint32_t inputChannels,
|
||||
uint32_t outputChannels, const uint8_t* src, size_t len);
|
||||
|
||||
|
||||
static bool LoadA2B0(SkColorLookUpTable* colorLUT, SkGammas* gammas, SkFloat3x3* toXYZ,
|
||||
SkFloat3* toXYZOffset, const uint8_t* src, size_t len);
|
||||
|
||||
SkColorSpace(SkGammas gammas, const SkFloat3x3& toXYZ, Named);
|
||||
|
||||
SkColorSpace(SkColorLookUpTable colorLUT, SkGammas gammas,
|
||||
const SkFloat3x3& toXYZ, const SkFloat3& toXYZOffset);
|
||||
|
||||
const SkColorLookUpTable fColorLUT;
|
||||
const SkFloat3 fGamma;
|
||||
const SkGammas fGammas;
|
||||
const SkFloat3x3 fToXYZD50;
|
||||
const SkFloat3 fToXYZOffset;
|
||||
|
||||
|
||||
@ -35,12 +35,14 @@ DEF_TEST(ColorSpaceParsePngICCProfile, r) {
|
||||
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]);
|
||||
// The color profile that we have extracted has represents gamma with a lookup table.
|
||||
// So we expect the gamma value to be zero.
|
||||
#ifdef SK_DEBUG
|
||||
const SkColorSpace::SkGammas& gammas = colorSpace->gammas();
|
||||
REPORTER_ASSERT(r, 0.0f == gammas.red());
|
||||
REPORTER_ASSERT(r, 0.0f == gammas.green());
|
||||
REPORTER_ASSERT(r, 0.0f == gammas.blue());
|
||||
#endif
|
||||
|
||||
// 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.
|
||||
@ -75,10 +77,12 @@ DEF_TEST(ColorSpaceParseJpegICCProfile, r) {
|
||||
|
||||
// It's important to use almost equal here. This profile sets gamma as
|
||||
// 563 / 256, which actually comes out to about 2.19922.
|
||||
SkFloat3 gammas = colorSpace->gamma();
|
||||
REPORTER_ASSERT(r, almost_equal(2.2f, gammas.fVec[0]));
|
||||
REPORTER_ASSERT(r, almost_equal(2.2f, gammas.fVec[1]));
|
||||
REPORTER_ASSERT(r, almost_equal(2.2f, gammas.fVec[2]));
|
||||
#ifdef SK_DEBUG
|
||||
const SkColorSpace::SkGammas& gammas = colorSpace->gammas();
|
||||
REPORTER_ASSERT(r, almost_equal(2.2f, gammas.red()));
|
||||
REPORTER_ASSERT(r, almost_equal(2.2f, gammas.green()));
|
||||
REPORTER_ASSERT(r, almost_equal(2.2f, gammas.blue()));
|
||||
#endif
|
||||
|
||||
// These nine values were extracted from the color profile. Until we know any
|
||||
// better, we'll assume these are the right values and test that we continue
|
||||
|
||||
Loading…
Reference in New Issue
Block a user