| /* |
| * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved. |
| * Copyright (C) 2007 Alp Toker <alp@atoker.com> |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "Gradient.h" |
| |
| #if USE(CG) |
| |
| #include "GraphicsContextCG.h" |
| #include <pal/spi/cg/CoreGraphicsSPI.h> |
| #include <wtf/RetainPtr.h> |
| |
| namespace WebCore { |
| |
| void Gradient::platformDestroy() |
| { |
| CGGradientRelease(m_gradient); |
| m_gradient = nullptr; |
| } |
| |
| CGGradientRef Gradient::platformGradient() |
| { |
| if (m_gradient) |
| return m_gradient; |
| |
| sortStopsIfNecessary(); |
| |
| auto colorsArray = adoptCF(CFArrayCreateMutable(0, m_stops.size(), &kCFTypeArrayCallBacks)); |
| unsigned numStops = m_stops.size(); |
| |
| const int reservedStops = 3; |
| Vector<CGFloat, reservedStops> locations; |
| locations.reserveInitialCapacity(numStops); |
| |
| Vector<CGFloat, 4 * reservedStops> colorComponents; |
| colorComponents.reserveInitialCapacity(numStops * 4); |
| |
| bool hasExtendedColors = false; |
| for (const auto& stop : m_stops) { |
| |
| // If all the stops are sRGB, it is faster to create a gradient using |
| // components than CGColors. |
| // FIXME: Rather than just check for extended colors, we should check the actual |
| // color space, and whether or not the components are outside [0-1]. |
| // <rdar://problem/32926606> |
| |
| if (stop.color.isExtended()) |
| hasExtendedColors = true; |
| |
| auto [colorSpace, components] = stop.color.colorSpaceAndComponents(); |
| auto [r, g, b, a] = components; |
| colorComponents.uncheckedAppend(r); |
| colorComponents.uncheckedAppend(g); |
| colorComponents.uncheckedAppend(b); |
| colorComponents.uncheckedAppend(a); |
| |
| CFArrayAppendValue(colorsArray.get(), cachedCGColor(stop.color)); |
| locations.uncheckedAppend(stop.offset); |
| } |
| |
| if (hasExtendedColors) |
| m_gradient = CGGradientCreateWithColors(extendedSRGBColorSpaceRef(), colorsArray.get(), locations.data()); |
| else |
| m_gradient = CGGradientCreateWithColorComponents(sRGBColorSpaceRef(), colorComponents.data(), locations.data(), numStops); |
| |
| return m_gradient; |
| } |
| |
| void Gradient::fill(GraphicsContext& context, const FloatRect& rect) |
| { |
| context.clip(rect); |
| paint(context); |
| } |
| |
| void Gradient::paint(GraphicsContext& context) |
| { |
| paint(context.platformContext()); |
| } |
| |
| void Gradient::paint(CGContextRef platformContext) |
| { |
| CGGradientDrawingOptions extendOptions = kCGGradientDrawsBeforeStartLocation | kCGGradientDrawsAfterEndLocation; |
| CGGradientRef gradient = platformGradient(); |
| |
| WTF::switchOn(m_data, |
| [&] (const LinearData& data) { |
| switch (m_spreadMethod) { |
| case GradientSpreadMethod::Repeat: |
| case GradientSpreadMethod::Reflect: { |
| CGContextStateSaver saveState(platformContext); |
| |
| FloatPoint gradientVectorNorm(data.point1 - data.point0); |
| gradientVectorNorm.normalize(); |
| CGFloat angle = acos(gradientVectorNorm.dot({ 1, 0 })); |
| CGContextRotateCTM(platformContext, angle); |
| |
| CGAffineTransform transform = CGAffineTransformMakeRotation(-angle); |
| FloatPoint point0 = CGPointApplyAffineTransform(data.point0, transform); |
| FloatPoint point1 = CGPointApplyAffineTransform(data.point1, transform); |
| |
| CGRect boundingBox = CGContextGetClipBoundingBox(platformContext); |
| CGFloat width = point1.x() - point0.x(); |
| CGFloat pixelSize = CGFAbs(CGContextConvertSizeToUserSpace(platformContext, CGSizeMake(1, 1)).width); |
| |
| if (width > 0 && !CGRectIsInfinite(boundingBox) && !CGRectIsEmpty(boundingBox)) { |
| extendOptions = 0; |
| if (width < pixelSize) |
| width = pixelSize; |
| |
| CGFloat gradientStart = point0.x(); |
| CGFloat gradientEnd = point1.x(); |
| bool flip = m_spreadMethod == GradientSpreadMethod::Reflect; |
| |
| // Find first gradient position to the left of the bounding box |
| int n = CGFloor((boundingBox.origin.x - gradientStart) / width); |
| gradientStart += n * width; |
| if (!(n % 2)) |
| flip = false; |
| |
| gradientEnd -= CGFloor((gradientEnd - CGRectGetMaxX(boundingBox)) / width) * width; |
| |
| for (CGFloat start = gradientStart; start <= gradientEnd; start += width) { |
| CGPoint left = CGPointMake(flip ? start + width : start, boundingBox.origin.y); |
| CGPoint right = CGPointMake(flip ? start : start + width, boundingBox.origin.y); |
| |
| CGContextDrawLinearGradient(platformContext, gradient, left, right, extendOptions); |
| |
| if (m_spreadMethod == GradientSpreadMethod::Reflect) |
| flip = !flip; |
| } |
| |
| break; |
| } |
| |
| FALLTHROUGH; |
| } |
| case GradientSpreadMethod::Pad: |
| CGContextDrawLinearGradient(platformContext, gradient, data.point0, data.point1, extendOptions); |
| } |
| }, |
| [&] (const RadialData& data) { |
| bool needScaling = data.aspectRatio != 1; |
| if (needScaling) { |
| CGContextSaveGState(platformContext); |
| // Scale from the center of the gradient. We only ever scale non-deprecated gradients, |
| // for which point0 == point1. |
| ASSERT(data.point0 == data.point1); |
| CGContextTranslateCTM(platformContext, data.point0.x(), data.point0.y()); |
| CGContextScaleCTM(platformContext, 1, 1 / data.aspectRatio); |
| CGContextTranslateCTM(platformContext, -data.point0.x(), -data.point0.y()); |
| } |
| |
| CGContextDrawRadialGradient(platformContext, gradient, data.point0, data.startRadius, data.point1, data.endRadius, extendOptions); |
| |
| if (needScaling) |
| CGContextRestoreGState(platformContext); |
| }, |
| [&] (const ConicData& data) { |
| // FIXME: Seems like this should be HAVE(CG_CONTEXT_DRAW_CONIC_GRADIENT). |
| // FIXME: Can we change tvOS to be like the other Cocoa platforms? |
| #if PLATFORM(COCOA) && !PLATFORM(APPLETV) |
| CGContextSaveGState(platformContext); |
| CGContextTranslateCTM(platformContext, data.point0.x(), data.point0.y()); |
| CGContextRotateCTM(platformContext, (CGFloat)-M_PI_2); |
| CGContextTranslateCTM(platformContext, -data.point0.x(), -data.point0.y()); |
| CGContextDrawConicGradient(platformContext, platformGradient(), data.point0, data.angleRadians); |
| CGContextRestoreGState(platformContext); |
| #else |
| UNUSED_PARAM(data); |
| #endif |
| } |
| ); |
| } |
| |
| } |
| |
| #endif |