248ff02331
- Hide SkImageEncoder class in private header.
- SkImageEncoder::Type becomes SkEncodedImageFormat
- SkEncodedFormat becomes SkEncodedImageFormat
- SkImageEncoder static functions replaced with
single function EncodeImage()
- utility wrappers for EncodeImage() are in
sk_tool_utils.h
TODO: remove link-time registration mechanism.
TODO: clean up clients use of API and flip the flag.
TODO: implement EncodeImage() in chromeium/skia/ext
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4909
Change-Id: Ib48b31fdc05cf23cda7f56ebfd67c841c149ce70
Reviewed-on: https://skia-review.googlesource.com/4909
Reviewed-by: Mike Reed <reed@google.com>
Reviewed-by: Leon Scroggins <scroggo@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
263 lines
10 KiB
C++
263 lines
10 KiB
C++
/*
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* Copyright 2016 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "Resources.h"
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#include "SkBitmap.h"
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#include "SkCanvas.h"
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#include "SkCodec.h"
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#include "SkColorSpace_XYZ.h"
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#include "SkCommandLineFlags.h"
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#include "SkForceLinking.h"
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#include "SkImageEncoder.h"
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#include "SkMatrix44.h"
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#include "SkOSFile.h"
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#include "sk_tool_utils.h"
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__SK_FORCE_IMAGE_DECODER_LINKING;
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DEFINE_string(input, "input.png", "A path to the input image or icc profile.");
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DEFINE_string(output, "output.png", "A path to the output image.");
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DEFINE_bool(sRGB, false, "Draws the sRGB gamut.");
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DEFINE_bool(adobeRGB, false, "Draws the Adobe RGB gamut.");
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DEFINE_string(uncorrected, "", "A path to reencode the uncorrected input image.");
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static void dump_transfer_fn(SkColorSpace_XYZ* colorSpace) {
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switch (colorSpace->gammaNamed()) {
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case kSRGB_SkGammaNamed:
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SkDebugf("Transfer Function: sRGB\n");
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return;
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case k2Dot2Curve_SkGammaNamed:
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SkDebugf("Exponential Transfer Function: Exponent 2.2\n");
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return;
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case kLinear_SkGammaNamed:
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SkDebugf("Transfer Function: Linear\n");
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return;
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default:
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break;
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}
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static const char* kChannels[] = { "Red ", "Green", "Blue ", };
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const SkGammas* gammas = colorSpace->gammas();
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for (int i = 0; i < 3; i++) {
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if (gammas->isNamed(i)) {
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switch (gammas->data(i).fNamed) {
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case kSRGB_SkGammaNamed:
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SkDebugf("%s Transfer Function: sRGB\n", kChannels[i]);
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return;
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case k2Dot2Curve_SkGammaNamed:
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SkDebugf("%s Transfer Function: Exponent 2.2\n", kChannels[i]);
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return;
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case kLinear_SkGammaNamed:
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SkDebugf("%s Transfer Function: Linear\n", kChannels[i]);
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return;
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default:
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SkASSERT(false);
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continue;
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}
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} else if (gammas->isValue(i)) {
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SkDebugf("%s Transfer Function: Exponent %.3f\n", kChannels[i], gammas->data(i).fValue);
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} else if (gammas->isParametric(i)) {
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const SkColorSpaceTransferFn& fn = gammas->data(i).params(gammas);
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SkDebugf("%s Transfer Function: Parametric A = %.3f, B = %.3f, C = %.3f, D = %.3f, "
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"E = %.3f, F = %.3f, G = %.3f\n", kChannels[i], fn.fA, fn.fB, fn.fC, fn.fD,
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fn.fE, fn.fF, fn.fG);
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} else {
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SkASSERT(gammas->isTable(i));
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SkDebugf("%s Transfer Function: Table (%d entries)\n", kChannels[i],
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gammas->data(i).fTable.fSize);
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}
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}
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}
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/**
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* Loads the triangular gamut as a set of three points.
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*/
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static void load_gamut(SkPoint rgb[], const SkMatrix44& xyz) {
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// rx = rX / (rX + rY + rZ)
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// ry = rX / (rX + rY + rZ)
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// gx, gy, bx, and gy are calulcated similarly.
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float rSum = xyz.get(0, 0) + xyz.get(1, 0) + xyz.get(2, 0);
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float gSum = xyz.get(0, 1) + xyz.get(1, 1) + xyz.get(2, 1);
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float bSum = xyz.get(0, 2) + xyz.get(1, 2) + xyz.get(2, 2);
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rgb[0].fX = xyz.get(0, 0) / rSum;
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rgb[0].fY = xyz.get(1, 0) / rSum;
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rgb[1].fX = xyz.get(0, 1) / gSum;
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rgb[1].fY = xyz.get(1, 1) / gSum;
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rgb[2].fX = xyz.get(0, 2) / bSum;
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rgb[2].fY = xyz.get(1, 2) / bSum;
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}
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/**
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* Calculates the area of the triangular gamut.
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*/
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static float calculate_area(SkPoint abc[]) {
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SkPoint a = abc[0];
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SkPoint b = abc[1];
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SkPoint c = abc[2];
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return 0.5f * SkTAbs(a.fX*b.fY + b.fX*c.fY - a.fX*c.fY - c.fX*b.fY - b.fX*a.fY);
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}
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static void draw_gamut(SkCanvas* canvas, const SkMatrix44& xyz, const char* name, SkColor color,
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bool label) {
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// Report the XYZ values.
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SkDebugf("%s\n", name);
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SkDebugf(" R G B\n");
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SkDebugf("X %.3f %.3f %.3f\n", xyz.get(0, 0), xyz.get(0, 1), xyz.get(0, 2));
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SkDebugf("Y %.3f %.3f %.3f\n", xyz.get(1, 0), xyz.get(1, 1), xyz.get(1, 2));
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SkDebugf("Z %.3f %.3f %.3f\n", xyz.get(2, 0), xyz.get(2, 1), xyz.get(2, 2));
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// Calculate the points in the gamut from the XYZ values.
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SkPoint rgb[4];
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load_gamut(rgb, xyz);
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// Report the area of the gamut.
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SkDebugf("Area of Gamut: %.3f\n\n", calculate_area(rgb));
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// Magic constants that help us place the gamut triangles in the appropriate position
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// on the canvas.
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const float xScale = 2071.25f; // Num pixels from 0 to 1 in x
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const float xOffset = 241.0f; // Num pixels until start of x-axis
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const float yScale = 2067.78f; // Num pixels from 0 to 1 in y
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const float yOffset = -144.78f; // Num pixels until start of y-axis
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// (negative because y extends beyond image bounds)
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// Now transform the points so they can be drawn on our canvas.
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// Note that y increases as we move down the canvas.
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rgb[0].fX = xOffset + xScale * rgb[0].fX;
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rgb[0].fY = yOffset + yScale * (1.0f - rgb[0].fY);
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rgb[1].fX = xOffset + xScale * rgb[1].fX;
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rgb[1].fY = yOffset + yScale * (1.0f - rgb[1].fY);
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rgb[2].fX = xOffset + xScale * rgb[2].fX;
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rgb[2].fY = yOffset + yScale * (1.0f - rgb[2].fY);
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// Repeat the first point to connect the polygon.
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rgb[3] = rgb[0];
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SkPaint paint;
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paint.setColor(color);
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paint.setStrokeWidth(6.0f);
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paint.setTextSize(75.0f);
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canvas->drawPoints(SkCanvas::kPolygon_PointMode, 4, rgb, paint);
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if (label) {
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canvas->drawText("R", 1, rgb[0].fX + 5.0f, rgb[0].fY + 75.0f, paint);
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canvas->drawText("G", 1, rgb[1].fX + 5.0f, rgb[1].fY - 5.0f, paint);
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canvas->drawText("B", 1, rgb[2].fX - 75.0f, rgb[2].fY - 5.0f, paint);
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}
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}
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int main(int argc, char** argv) {
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SkCommandLineFlags::SetUsage(
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"Usage: colorspaceinfo --input <path to input image or icc profile> "
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"--output <path to output image> "
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"--sRGB <draw canonical sRGB gamut> "
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"--adobeRGB <draw canonical Adobe RGB gamut> "
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"--uncorrected <path to reencoded, uncorrected input image>\n"
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"Description: Writes a visualization of the color space to the output image ."
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"Also, if a path is provided, writes uncorrected bytes to an unmarked "
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"png, for comparison with the input image.\n");
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SkCommandLineFlags::Parse(argc, argv);
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const char* input = FLAGS_input[0];
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const char* output = FLAGS_output[0];
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if (!input || !output) {
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SkCommandLineFlags::PrintUsage();
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return -1;
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}
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sk_sp<SkData> data(SkData::MakeFromFileName(input));
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if (!data) {
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SkDebugf("Cannot find input image.\n");
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return -1;
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}
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std::unique_ptr<SkCodec> codec(SkCodec::NewFromData(data));
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sk_sp<SkColorSpace> colorSpace = nullptr;
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if (codec) {
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colorSpace = sk_ref_sp(codec->getInfo().colorSpace());
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} else {
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colorSpace = SkColorSpace::MakeICC(data->bytes(), data->size());
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}
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if (!colorSpace) {
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SkDebugf("Cannot create codec or icc profile from input file.\n");
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return -1;
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}
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// Load a graph of the CIE XYZ color gamut.
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SkBitmap gamut;
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if (!GetResourceAsBitmap("gamut.png", &gamut)) {
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SkDebugf("Program failure.\n");
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return -1;
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}
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SkCanvas canvas(gamut);
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// Draw the sRGB gamut if requested.
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if (FLAGS_sRGB) {
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sk_sp<SkColorSpace> sRGBSpace = SkColorSpace::MakeNamed(SkColorSpace::kSRGB_Named);
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const SkMatrix44* mat = as_CSB(sRGBSpace)->toXYZD50();
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SkASSERT(mat);
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draw_gamut(&canvas, *mat, "sRGB", 0xFFFF9394, false);
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}
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// Draw the Adobe RGB gamut if requested.
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if (FLAGS_adobeRGB) {
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sk_sp<SkColorSpace> adobeRGBSpace = SkColorSpace::MakeNamed(SkColorSpace::kAdobeRGB_Named);
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const SkMatrix44* mat = as_CSB(adobeRGBSpace)->toXYZD50();
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SkASSERT(mat);
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draw_gamut(&canvas, *mat, "Adobe RGB", 0xFF31a9e1, false);
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}
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if (SkColorSpace_Base::Type::kXYZ == as_CSB(colorSpace)->type()) {
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const SkMatrix44* mat = as_CSB(colorSpace)->toXYZD50();
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SkASSERT(mat);
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draw_gamut(&canvas, *mat, input, 0xFF000000, true);
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dump_transfer_fn((SkColorSpace_XYZ*) colorSpace.get());
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} else {
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SkDebugf("Color space is defined using an A2B tag. It cannot be represented by "
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"a transfer function and to D50 matrix.\n");
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}
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// Finally, encode the result to the output file.
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sk_sp<SkData> out = sk_tool_utils::EncodeImageToData(gamut, SkEncodedImageFormat::kPNG, 100);
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if (!out) {
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SkDebugf("Failed to encode gamut output.\n");
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return -1;
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}
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SkFILEWStream stream(output);
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bool result = stream.write(out->data(), out->size());
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if (!result) {
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SkDebugf("Failed to write gamut output.\n");
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return -1;
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}
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// Also, if requested, decode and reencode the uncorrected input image.
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if (!FLAGS_uncorrected.isEmpty() && codec) {
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SkBitmap bitmap;
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int width = codec->getInfo().width();
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int height = codec->getInfo().height();
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bitmap.allocN32Pixels(width, height, kOpaque_SkAlphaType == codec->getInfo().alphaType());
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SkImageInfo decodeInfo = SkImageInfo::MakeN32(width, height, kUnpremul_SkAlphaType);
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if (SkCodec::kSuccess != codec->getPixels(decodeInfo, bitmap.getPixels(),
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bitmap.rowBytes())) {
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SkDebugf("Could not decode input image.\n");
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return -1;
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}
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out = sk_tool_utils::EncodeImageToData(bitmap, SkEncodedImageFormat::kPNG, 100);
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if (!out) {
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SkDebugf("Failed to encode uncorrected image.\n");
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return -1;
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}
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SkFILEWStream bitmapStream(FLAGS_uncorrected[0]);
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result = bitmapStream.write(out->data(), out->size());
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if (!result) {
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SkDebugf("Failed to write uncorrected image output.\n");
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return -1;
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}
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}
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return 0;
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}
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