| /* |
| * 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 "SkBitmap.h" |
| #include "SkCanvas.h" |
| #include "SkCodec.h" |
| #include "SkColorSpace_XYZ.h" |
| #include "SkCommandLineFlags.h" |
| #include "SkForceLinking.h" |
| #include "SkImageEncoder.h" |
| #include "SkMatrix44.h" |
| #include "SkOSFile.h" |
| |
| __SK_FORCE_IMAGE_DECODER_LINKING; |
| |
| DEFINE_string(input, "input.png", "A path to the input image or icc profile."); |
| DEFINE_string(output, "output.png", "A path to the output image."); |
| DEFINE_bool(sRGB, false, "Draws the sRGB gamut."); |
| DEFINE_bool(adobeRGB, false, "Draws the Adobe RGB gamut."); |
| DEFINE_string(uncorrected, "", "A path to reencode the uncorrected input image."); |
| |
| static void dump_transfer_fn(SkColorSpace_XYZ* colorSpace) { |
| switch (colorSpace->gammaNamed()) { |
| case kSRGB_SkGammaNamed: |
| SkDebugf("Transfer Function: sRGB\n"); |
| return; |
| case k2Dot2Curve_SkGammaNamed: |
| SkDebugf("Exponential Transfer Function: Exponent 2.2\n"); |
| return; |
| case kLinear_SkGammaNamed: |
| SkDebugf("Transfer Function: Linear\n"); |
| return; |
| default: |
| break; |
| } |
| |
| static const char* kChannels[] = { "Red ", "Green", "Blue ", }; |
| const SkGammas* gammas = colorSpace->gammas(); |
| for (int i = 0; i < 3; i++) { |
| if (gammas->isNamed(i)) { |
| switch (gammas->data(i).fNamed) { |
| case kSRGB_SkGammaNamed: |
| SkDebugf("%s Transfer Function: sRGB\n", kChannels[i]); |
| return; |
| case k2Dot2Curve_SkGammaNamed: |
| SkDebugf("%s Transfer Function: Exponent 2.2\n", kChannels[i]); |
| return; |
| case kLinear_SkGammaNamed: |
| SkDebugf("%s Transfer Function: Linear\n", kChannels[i]); |
| return; |
| default: |
| SkASSERT(false); |
| continue; |
| } |
| } else if (gammas->isValue(i)) { |
| SkDebugf("%s Transfer Function: Exponent %.3f\n", kChannels[i], gammas->data(i).fValue); |
| } else if (gammas->isParametric(i)) { |
| const SkColorSpaceTransferFn& fn = gammas->data(i).params(gammas); |
| SkDebugf("%s Transfer Function: Parametric A = %.3f, B = %.3f, C = %.3f, D = %.3f, " |
| "E = %.3f, F = %.3f, G = %.3f\n", kChannels[i], fn.fA, fn.fB, fn.fC, fn.fD, |
| fn.fE, fn.fF, fn.fG); |
| } else { |
| SkASSERT(gammas->isTable(i)); |
| SkDebugf("%s Transfer Function: Table (%d entries)\n", kChannels[i], |
| gammas->data(i).fTable.fSize); |
| } |
| } |
| } |
| |
| /** |
| * Loads the triangular gamut as a set of three points. |
| */ |
| static void load_gamut(SkPoint rgb[], const SkMatrix44& xyz) { |
| // rx = rX / (rX + rY + rZ) |
| // ry = rX / (rX + rY + rZ) |
| // gx, gy, bx, and gy are calulcated similarly. |
| float rSum = xyz.get(0, 0) + xyz.get(1, 0) + xyz.get(2, 0); |
| float gSum = xyz.get(0, 1) + xyz.get(1, 1) + xyz.get(2, 1); |
| float bSum = xyz.get(0, 2) + xyz.get(1, 2) + xyz.get(2, 2); |
| rgb[0].fX = xyz.get(0, 0) / rSum; |
| rgb[0].fY = xyz.get(1, 0) / rSum; |
| rgb[1].fX = xyz.get(0, 1) / gSum; |
| rgb[1].fY = xyz.get(1, 1) / gSum; |
| rgb[2].fX = xyz.get(0, 2) / bSum; |
| rgb[2].fY = xyz.get(1, 2) / bSum; |
| } |
| |
| /** |
| * Calculates the area of the triangular gamut. |
| */ |
| static float calculate_area(SkPoint abc[]) { |
| SkPoint a = abc[0]; |
| SkPoint b = abc[1]; |
| SkPoint c = abc[2]; |
| return 0.5f * SkTAbs(a.fX*b.fY + b.fX*c.fY - a.fX*c.fY - c.fX*b.fY - b.fX*a.fY); |
| } |
| |
| static void draw_gamut(SkCanvas* canvas, const SkMatrix44& xyz, const char* name, SkColor color, |
| bool label) { |
| // Report the XYZ values. |
| SkDebugf("%s\n", name); |
| SkDebugf(" R G B\n"); |
| SkDebugf("X %.3f %.3f %.3f\n", xyz.get(0, 0), xyz.get(0, 1), xyz.get(0, 2)); |
| SkDebugf("Y %.3f %.3f %.3f\n", xyz.get(1, 0), xyz.get(1, 1), xyz.get(1, 2)); |
| SkDebugf("Z %.3f %.3f %.3f\n", xyz.get(2, 0), xyz.get(2, 1), xyz.get(2, 2)); |
| |
| // Calculate the points in the gamut from the XYZ values. |
| SkPoint rgb[4]; |
| load_gamut(rgb, xyz); |
| |
| // Report the area of the gamut. |
| SkDebugf("Area of Gamut: %.3f\n\n", calculate_area(rgb)); |
| |
| // Magic constants that help us place the gamut triangles in the appropriate position |
| // on the canvas. |
| const float xScale = 2071.25f; // Num pixels from 0 to 1 in x |
| const float xOffset = 241.0f; // Num pixels until start of x-axis |
| const float yScale = 2067.78f; // Num pixels from 0 to 1 in y |
| const float yOffset = -144.78f; // Num pixels until start of y-axis |
| // (negative because y extends beyond image bounds) |
| |
| // Now transform the points so they can be drawn on our canvas. |
| // Note that y increases as we move down the canvas. |
| rgb[0].fX = xOffset + xScale * rgb[0].fX; |
| rgb[0].fY = yOffset + yScale * (1.0f - rgb[0].fY); |
| rgb[1].fX = xOffset + xScale * rgb[1].fX; |
| rgb[1].fY = yOffset + yScale * (1.0f - rgb[1].fY); |
| rgb[2].fX = xOffset + xScale * rgb[2].fX; |
| rgb[2].fY = yOffset + yScale * (1.0f - rgb[2].fY); |
| |
| // Repeat the first point to connect the polygon. |
| rgb[3] = rgb[0]; |
| SkPaint paint; |
| paint.setColor(color); |
| paint.setStrokeWidth(6.0f); |
| paint.setTextSize(75.0f); |
| canvas->drawPoints(SkCanvas::kPolygon_PointMode, 4, rgb, paint); |
| if (label) { |
| canvas->drawText("R", 1, rgb[0].fX + 5.0f, rgb[0].fY + 75.0f, paint); |
| canvas->drawText("G", 1, rgb[1].fX + 5.0f, rgb[1].fY - 5.0f, paint); |
| canvas->drawText("B", 1, rgb[2].fX - 75.0f, rgb[2].fY - 5.0f, paint); |
| } |
| } |
| |
| int main(int argc, char** argv) { |
| SkCommandLineFlags::SetUsage( |
| "Usage: colorspaceinfo --input <path to input image or icc profile> " |
| "--output <path to output image> " |
| "--sRGB <draw canonical sRGB gamut> " |
| "--adobeRGB <draw canonical Adobe RGB gamut> " |
| "--uncorrected <path to reencoded, uncorrected input image>\n" |
| "Description: Writes a visualization of the color space to the output image ." |
| "Also, if a path is provided, writes uncorrected bytes to an unmarked " |
| "png, for comparison with the input image.\n"); |
| SkCommandLineFlags::Parse(argc, argv); |
| const char* input = FLAGS_input[0]; |
| const char* output = FLAGS_output[0]; |
| if (!input || !output) { |
| SkCommandLineFlags::PrintUsage(); |
| return -1; |
| } |
| |
| sk_sp<SkData> data(SkData::MakeFromFileName(input)); |
| if (!data) { |
| SkDebugf("Cannot find input image.\n"); |
| return -1; |
| } |
| std::unique_ptr<SkCodec> codec(SkCodec::NewFromData(data)); |
| sk_sp<SkColorSpace> colorSpace = nullptr; |
| if (codec) { |
| colorSpace = sk_ref_sp(codec->getInfo().colorSpace()); |
| } else { |
| colorSpace = SkColorSpace::MakeICC(data->bytes(), data->size()); |
| } |
| |
| if (!colorSpace) { |
| SkDebugf("Cannot create codec or icc profile from input file.\n"); |
| return -1; |
| } |
| |
| // Load a graph of the CIE XYZ color gamut. |
| SkBitmap gamut; |
| if (!GetResourceAsBitmap("gamut.png", &gamut)) { |
| SkDebugf("Program failure.\n"); |
| return -1; |
| } |
| SkCanvas canvas(gamut); |
| |
| // Draw the sRGB gamut if requested. |
| if (FLAGS_sRGB) { |
| sk_sp<SkColorSpace> sRGBSpace = SkColorSpace::MakeNamed(SkColorSpace::kSRGB_Named); |
| const SkMatrix44* mat = as_CSB(sRGBSpace)->toXYZD50(); |
| SkASSERT(mat); |
| draw_gamut(&canvas, *mat, "sRGB", 0xFFFF9394, false); |
| } |
| |
| // Draw the Adobe RGB gamut if requested. |
| if (FLAGS_adobeRGB) { |
| sk_sp<SkColorSpace> adobeRGBSpace = SkColorSpace::MakeNamed(SkColorSpace::kAdobeRGB_Named); |
| const SkMatrix44* mat = as_CSB(adobeRGBSpace)->toXYZD50(); |
| SkASSERT(mat); |
| draw_gamut(&canvas, *mat, "Adobe RGB", 0xFF31a9e1, false); |
| } |
| |
| if (SkColorSpace_Base::Type::kXYZ == as_CSB(colorSpace)->type()) { |
| const SkMatrix44* mat = as_CSB(colorSpace)->toXYZD50(); |
| SkASSERT(mat); |
| draw_gamut(&canvas, *mat, input, 0xFF000000, true); |
| dump_transfer_fn((SkColorSpace_XYZ*) colorSpace.get()); |
| } else { |
| SkDebugf("Color space is defined using an A2B tag. It cannot be represented by " |
| "a transfer function and to D50 matrix.\n"); |
| } |
| |
| // Finally, encode the result to the output file. |
| sk_sp<SkData> out(SkImageEncoder::EncodeData(gamut, SkImageEncoder::kPNG_Type, 100)); |
| if (!out) { |
| SkDebugf("Failed to encode gamut output.\n"); |
| return -1; |
| } |
| SkFILEWStream stream(output); |
| bool result = stream.write(out->data(), out->size()); |
| if (!result) { |
| SkDebugf("Failed to write gamut output.\n"); |
| return -1; |
| } |
| |
| // Also, if requested, decode and reencode the uncorrected input image. |
| if (!FLAGS_uncorrected.isEmpty() && codec) { |
| SkBitmap bitmap; |
| int width = codec->getInfo().width(); |
| int height = codec->getInfo().height(); |
| bitmap.allocN32Pixels(width, height, kOpaque_SkAlphaType == codec->getInfo().alphaType()); |
| SkImageInfo decodeInfo = SkImageInfo::MakeN32(width, height, kUnpremul_SkAlphaType); |
| if (SkCodec::kSuccess != codec->getPixels(decodeInfo, bitmap.getPixels(), |
| bitmap.rowBytes())) { |
| SkDebugf("Could not decode input image.\n"); |
| return -1; |
| } |
| out.reset(SkImageEncoder::EncodeData(bitmap, SkImageEncoder::kPNG_Type, 100)); |
| if (!out) { |
| SkDebugf("Failed to encode uncorrected image.\n"); |
| return -1; |
| } |
| SkFILEWStream bitmapStream(FLAGS_uncorrected[0]); |
| result = bitmapStream.write(out->data(), out->size()); |
| if (!result) { |
| SkDebugf("Failed to write uncorrected image output.\n"); |
| return -1; |
| } |
| } |
| |
| return 0; |
| } |
