| /* |
| * Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org> |
| * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org> |
| * Copyright (C) 2005 Eric Seidel <eric@webkit.org> |
| * Copyright (C) 2009 Dirk Schulze <krit@webkit.org> |
| * Copyright (C) Research In Motion Limited 2010. All rights reserved. |
| * Copyright (C) 2013 Google Inc. All rights reserved. |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public License |
| * along with this library; see the file COPYING.LIB. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| */ |
| |
| #include "sky/engine/platform/graphics/filters/FEComponentTransfer.h" |
| |
| #include "sky/engine/platform/graphics/GraphicsContext.h" |
| #include "sky/engine/platform/graphics/filters/SkiaImageFilterBuilder.h" |
| #include "sky/engine/platform/graphics/skia/NativeImageSkia.h" |
| #include "sky/engine/platform/text/TextStream.h" |
| #include "sky/engine/wtf/MathExtras.h" |
| #include "sky/engine/wtf/StdLibExtras.h" |
| #include "sky/engine/wtf/Uint8ClampedArray.h" |
| #include "third_party/skia/include/effects/SkColorFilterImageFilter.h" |
| #include "third_party/skia/include/effects/SkTableColorFilter.h" |
| |
| namespace blink { |
| |
| typedef void (*TransferType)(unsigned char*, const ComponentTransferFunction&); |
| |
| FEComponentTransfer::FEComponentTransfer(Filter* filter, const ComponentTransferFunction& redFunc, const ComponentTransferFunction& greenFunc, |
| const ComponentTransferFunction& blueFunc, const ComponentTransferFunction& alphaFunc) |
| : FilterEffect(filter) |
| , m_redFunc(redFunc) |
| , m_greenFunc(greenFunc) |
| , m_blueFunc(blueFunc) |
| , m_alphaFunc(alphaFunc) |
| { |
| } |
| |
| PassRefPtr<FEComponentTransfer> FEComponentTransfer::create(Filter* filter, const ComponentTransferFunction& redFunc, |
| const ComponentTransferFunction& greenFunc, const ComponentTransferFunction& blueFunc, const ComponentTransferFunction& alphaFunc) |
| { |
| return adoptRef(new FEComponentTransfer(filter, redFunc, greenFunc, blueFunc, alphaFunc)); |
| } |
| |
| ComponentTransferFunction FEComponentTransfer::redFunction() const |
| { |
| return m_redFunc; |
| } |
| |
| void FEComponentTransfer::setRedFunction(const ComponentTransferFunction& func) |
| { |
| m_redFunc = func; |
| } |
| |
| ComponentTransferFunction FEComponentTransfer::greenFunction() const |
| { |
| return m_greenFunc; |
| } |
| |
| void FEComponentTransfer::setGreenFunction(const ComponentTransferFunction& func) |
| { |
| m_greenFunc = func; |
| } |
| |
| ComponentTransferFunction FEComponentTransfer::blueFunction() const |
| { |
| return m_blueFunc; |
| } |
| |
| void FEComponentTransfer::setBlueFunction(const ComponentTransferFunction& func) |
| { |
| m_blueFunc = func; |
| } |
| |
| ComponentTransferFunction FEComponentTransfer::alphaFunction() const |
| { |
| return m_alphaFunc; |
| } |
| |
| void FEComponentTransfer::setAlphaFunction(const ComponentTransferFunction& func) |
| { |
| m_alphaFunc = func; |
| } |
| |
| static void identity(unsigned char*, const ComponentTransferFunction&) |
| { |
| } |
| |
| static void table(unsigned char* values, const ComponentTransferFunction& transferFunction) |
| { |
| const Vector<float>& tableValues = transferFunction.tableValues; |
| unsigned n = tableValues.size(); |
| if (n < 1) |
| return; |
| for (unsigned i = 0; i < 256; ++i) { |
| double c = i / 255.0; |
| unsigned k = static_cast<unsigned>(c * (n - 1)); |
| double v1 = tableValues[k]; |
| double v2 = tableValues[std::min((k + 1), (n - 1))]; |
| double val = 255.0 * (v1 + (c * (n - 1) - k) * (v2 - v1)); |
| val = std::max(0.0, std::min(255.0, val)); |
| values[i] = static_cast<unsigned char>(val); |
| } |
| } |
| |
| static void discrete(unsigned char* values, const ComponentTransferFunction& transferFunction) |
| { |
| const Vector<float>& tableValues = transferFunction.tableValues; |
| unsigned n = tableValues.size(); |
| if (n < 1) |
| return; |
| for (unsigned i = 0; i < 256; ++i) { |
| unsigned k = static_cast<unsigned>((i * n) / 255.0); |
| k = std::min(k, n - 1); |
| double val = 255 * tableValues[k]; |
| val = std::max(0.0, std::min(255.0, val)); |
| values[i] = static_cast<unsigned char>(val); |
| } |
| } |
| |
| static void linear(unsigned char* values, const ComponentTransferFunction& transferFunction) |
| { |
| for (unsigned i = 0; i < 256; ++i) { |
| double val = transferFunction.slope * i + 255 * transferFunction.intercept; |
| val = std::max(0.0, std::min(255.0, val)); |
| values[i] = static_cast<unsigned char>(val); |
| } |
| } |
| |
| static void gamma(unsigned char* values, const ComponentTransferFunction& transferFunction) |
| { |
| for (unsigned i = 0; i < 256; ++i) { |
| double exponent = transferFunction.exponent; // RCVT doesn't like passing a double and a float to pow, so promote this to double |
| double val = 255.0 * (transferFunction.amplitude * pow((i / 255.0), exponent) + transferFunction.offset); |
| val = std::max(0.0, std::min(255.0, val)); |
| values[i] = static_cast<unsigned char>(val); |
| } |
| } |
| |
| void FEComponentTransfer::applySoftware() |
| { |
| FilterEffect* in = inputEffect(0); |
| ImageBuffer* resultImage = createImageBufferResult(); |
| if (!resultImage) |
| return; |
| |
| RefPtr<Image> image = in->asImageBuffer()->copyImage(DontCopyBackingStore); |
| RefPtr<NativeImageSkia> nativeImage = image->nativeImageForCurrentFrame(); |
| if (!nativeImage) |
| return; |
| |
| unsigned char rValues[256], gValues[256], bValues[256], aValues[256]; |
| getValues(rValues, gValues, bValues, aValues); |
| |
| IntRect destRect = drawingRegionOfInputImage(in->absolutePaintRect()); |
| SkPaint paint; |
| paint.setColorFilter(SkTableColorFilter::CreateARGB(aValues, rValues, gValues, bValues))->unref(); |
| paint.setXfermodeMode(SkXfermode::kSrc_Mode); |
| resultImage->context()->drawBitmap(nativeImage->bitmap(), destRect.x(), destRect.y(), &paint); |
| |
| if (affectsTransparentPixels()) { |
| IntRect fullRect = IntRect(IntPoint(), absolutePaintRect().size()); |
| resultImage->context()->clipOut(destRect); |
| resultImage->context()->fillRect(fullRect, Color(rValues[0], gValues[0], bValues[0], aValues[0])); |
| } |
| } |
| |
| bool FEComponentTransfer::affectsTransparentPixels() |
| { |
| double intercept = 0; |
| switch (m_alphaFunc.type) { |
| case FECOMPONENTTRANSFER_TYPE_UNKNOWN: |
| case FECOMPONENTTRANSFER_TYPE_IDENTITY: |
| break; |
| case FECOMPONENTTRANSFER_TYPE_TABLE: |
| case FECOMPONENTTRANSFER_TYPE_DISCRETE: |
| if (m_alphaFunc.tableValues.size() > 0) |
| intercept = m_alphaFunc.tableValues[0]; |
| break; |
| case FECOMPONENTTRANSFER_TYPE_LINEAR: |
| intercept = m_alphaFunc.intercept; |
| break; |
| case FECOMPONENTTRANSFER_TYPE_GAMMA: |
| intercept = m_alphaFunc.offset; |
| break; |
| } |
| return 255 * intercept >= 1; |
| } |
| |
| PassRefPtr<SkImageFilter> FEComponentTransfer::createImageFilter(SkiaImageFilterBuilder* builder) |
| { |
| RefPtr<SkImageFilter> input(builder->build(inputEffect(0), operatingColorSpace())); |
| |
| unsigned char rValues[256], gValues[256], bValues[256], aValues[256]; |
| getValues(rValues, gValues, bValues, aValues); |
| |
| SkAutoTUnref<SkColorFilter> colorFilter(SkTableColorFilter::CreateARGB(aValues, rValues, gValues, bValues)); |
| |
| SkImageFilter::CropRect cropRect = getCropRect(builder->cropOffset()); |
| return adoptRef(SkColorFilterImageFilter::Create(colorFilter, input.get(), &cropRect)); |
| } |
| |
| void FEComponentTransfer::getValues(unsigned char rValues[256], unsigned char gValues[256], unsigned char bValues[256], unsigned char aValues[256]) |
| { |
| for (unsigned i = 0; i < 256; ++i) |
| rValues[i] = gValues[i] = bValues[i] = aValues[i] = i; |
| unsigned char* tables[] = { rValues, gValues, bValues, aValues }; |
| ComponentTransferFunction transferFunction[] = {m_redFunc, m_greenFunc, m_blueFunc, m_alphaFunc}; |
| TransferType callEffect[] = {identity, identity, table, discrete, linear, gamma}; |
| |
| for (unsigned channel = 0; channel < 4; channel++) { |
| ASSERT_WITH_SECURITY_IMPLICATION(static_cast<size_t>(transferFunction[channel].type) < WTF_ARRAY_LENGTH(callEffect)); |
| (*callEffect[transferFunction[channel].type])(tables[channel], transferFunction[channel]); |
| } |
| } |
| |
| static TextStream& operator<<(TextStream& ts, const ComponentTransferType& type) |
| { |
| switch (type) { |
| case FECOMPONENTTRANSFER_TYPE_UNKNOWN: |
| ts << "UNKNOWN"; |
| break; |
| case FECOMPONENTTRANSFER_TYPE_IDENTITY: |
| ts << "IDENTITY"; |
| break; |
| case FECOMPONENTTRANSFER_TYPE_TABLE: |
| ts << "TABLE"; |
| break; |
| case FECOMPONENTTRANSFER_TYPE_DISCRETE: |
| ts << "DISCRETE"; |
| break; |
| case FECOMPONENTTRANSFER_TYPE_LINEAR: |
| ts << "LINEAR"; |
| break; |
| case FECOMPONENTTRANSFER_TYPE_GAMMA: |
| ts << "GAMMA"; |
| break; |
| } |
| return ts; |
| } |
| |
| static TextStream& operator<<(TextStream& ts, const ComponentTransferFunction& function) |
| { |
| ts << "type=\"" << function.type |
| << "\" slope=\"" << function.slope |
| << "\" intercept=\"" << function.intercept |
| << "\" amplitude=\"" << function.amplitude |
| << "\" exponent=\"" << function.exponent |
| << "\" offset=\"" << function.offset << "\""; |
| return ts; |
| } |
| |
| TextStream& FEComponentTransfer::externalRepresentation(TextStream& ts, int indent) const |
| { |
| writeIndent(ts, indent); |
| ts << "[feComponentTransfer"; |
| FilterEffect::externalRepresentation(ts); |
| ts << " \n"; |
| writeIndent(ts, indent + 2); |
| ts << "{red: " << m_redFunc << "}\n"; |
| writeIndent(ts, indent + 2); |
| ts << "{green: " << m_greenFunc << "}\n"; |
| writeIndent(ts, indent + 2); |
| ts << "{blue: " << m_blueFunc << "}\n"; |
| writeIndent(ts, indent + 2); |
| ts << "{alpha: " << m_alphaFunc << "}]\n"; |
| inputEffect(0)->externalRepresentation(ts, indent + 1); |
| return ts; |
| } |
| |
| } // namespace blink |