1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/thebes/gfxBlur.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,180 @@
1.4 +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
1.5 + * This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +#include "gfxBlur.h"
1.10 +#include "gfxContext.h"
1.11 +#include "gfxImageSurface.h"
1.12 +#include "gfxPlatform.h"
1.13 +
1.14 +#include "mozilla/gfx/Blur.h"
1.15 +#include "mozilla/gfx/2D.h"
1.16 +
1.17 +using namespace mozilla::gfx;
1.18 +
1.19 +gfxAlphaBoxBlur::gfxAlphaBoxBlur()
1.20 + : mBlur(nullptr)
1.21 +{
1.22 +}
1.23 +
1.24 +gfxAlphaBoxBlur::~gfxAlphaBoxBlur()
1.25 +{
1.26 + mContext = nullptr;
1.27 + delete mBlur;
1.28 +}
1.29 +
1.30 +gfxContext*
1.31 +gfxAlphaBoxBlur::Init(const gfxRect& aRect,
1.32 + const gfxIntSize& aSpreadRadius,
1.33 + const gfxIntSize& aBlurRadius,
1.34 + const gfxRect* aDirtyRect,
1.35 + const gfxRect* aSkipRect)
1.36 +{
1.37 + mozilla::gfx::Rect rect(Float(aRect.x), Float(aRect.y),
1.38 + Float(aRect.width), Float(aRect.height));
1.39 + IntSize spreadRadius(aSpreadRadius.width, aSpreadRadius.height);
1.40 + IntSize blurRadius(aBlurRadius.width, aBlurRadius.height);
1.41 + nsAutoPtr<mozilla::gfx::Rect> dirtyRect;
1.42 + if (aDirtyRect) {
1.43 + dirtyRect = new mozilla::gfx::Rect(Float(aDirtyRect->x),
1.44 + Float(aDirtyRect->y),
1.45 + Float(aDirtyRect->width),
1.46 + Float(aDirtyRect->height));
1.47 + }
1.48 + nsAutoPtr<mozilla::gfx::Rect> skipRect;
1.49 + if (aSkipRect) {
1.50 + skipRect = new mozilla::gfx::Rect(Float(aSkipRect->x),
1.51 + Float(aSkipRect->y),
1.52 + Float(aSkipRect->width),
1.53 + Float(aSkipRect->height));
1.54 + }
1.55 +
1.56 + mBlur = new AlphaBoxBlur(rect, spreadRadius, blurRadius, dirtyRect, skipRect);
1.57 + size_t blurDataSize = mBlur->GetSurfaceAllocationSize();
1.58 + if (blurDataSize == 0)
1.59 + return nullptr;
1.60 +
1.61 + IntSize size = mBlur->GetSize();
1.62 +
1.63 + // Make an alpha-only surface to draw on. We will play with the data after
1.64 + // everything is drawn to create a blur effect.
1.65 + mData = new (std::nothrow) unsigned char[blurDataSize];
1.66 + if (!mData) {
1.67 + return nullptr;
1.68 + }
1.69 + memset(mData, 0, blurDataSize);
1.70 +
1.71 + mozilla::RefPtr<DrawTarget> dt =
1.72 + gfxPlatform::GetPlatform()->CreateDrawTargetForData(mData, size,
1.73 + mBlur->GetStride(),
1.74 + SurfaceFormat::A8);
1.75 + if (!dt) {
1.76 + nsRefPtr<gfxImageSurface> image =
1.77 + new gfxImageSurface(mData,
1.78 + gfxIntSize(size.width, size.height),
1.79 + mBlur->GetStride(),
1.80 + gfxImageFormat::A8);
1.81 + dt = Factory::CreateDrawTargetForCairoSurface(image->CairoSurface(), size);
1.82 + if (!dt) {
1.83 + return nullptr;
1.84 + }
1.85 + }
1.86 +
1.87 + IntRect irect = mBlur->GetRect();
1.88 + gfxPoint topleft(irect.TopLeft().x, irect.TopLeft().y);
1.89 +
1.90 + mContext = new gfxContext(dt);
1.91 + mContext->Translate(-topleft);
1.92 +
1.93 + return mContext;
1.94 +}
1.95 +
1.96 +void
1.97 +gfxAlphaBoxBlur::Paint(gfxContext* aDestinationCtx)
1.98 +{
1.99 + if (!mContext)
1.100 + return;
1.101 +
1.102 + mBlur->Blur(mData);
1.103 +
1.104 + mozilla::gfx::Rect* dirtyRect = mBlur->GetDirtyRect();
1.105 +
1.106 + DrawTarget *dest = aDestinationCtx->GetDrawTarget();
1.107 + if (!dest) {
1.108 + NS_WARNING("Blurring not supported for Thebes contexts!");
1.109 + return;
1.110 + }
1.111 +
1.112 + mozilla::RefPtr<SourceSurface> mask
1.113 + = dest->CreateSourceSurfaceFromData(mData,
1.114 + mBlur->GetSize(),
1.115 + mBlur->GetStride(),
1.116 + SurfaceFormat::A8);
1.117 + if (!mask) {
1.118 + NS_ERROR("Failed to create mask!");
1.119 + return;
1.120 + }
1.121 +
1.122 + nsRefPtr<gfxPattern> thebesPat = aDestinationCtx->GetPattern();
1.123 + Pattern* pat = thebesPat->GetPattern(dest, nullptr);
1.124 +
1.125 + Matrix oldTransform = dest->GetTransform();
1.126 + Matrix newTransform = oldTransform;
1.127 + newTransform.Translate(mBlur->GetRect().x, mBlur->GetRect().y);
1.128 +
1.129 + // Avoid a semi-expensive clip operation if we can, otherwise
1.130 + // clip to the dirty rect
1.131 + if (dirtyRect) {
1.132 + dest->PushClipRect(*dirtyRect);
1.133 + }
1.134 +
1.135 + dest->SetTransform(newTransform);
1.136 + dest->MaskSurface(*pat, mask, Point(0, 0));
1.137 + dest->SetTransform(oldTransform);
1.138 +
1.139 + if (dirtyRect) {
1.140 + dest->PopClip();
1.141 + }
1.142 +}
1.143 +
1.144 +gfxIntSize gfxAlphaBoxBlur::CalculateBlurRadius(const gfxPoint& aStd)
1.145 +{
1.146 + mozilla::gfx::Point std(Float(aStd.x), Float(aStd.y));
1.147 + IntSize size = AlphaBoxBlur::CalculateBlurRadius(std);
1.148 + return gfxIntSize(size.width, size.height);
1.149 +}
1.150 +
1.151 +/* static */ void
1.152 +gfxAlphaBoxBlur::BlurRectangle(gfxContext *aDestinationCtx,
1.153 + const gfxRect& aRect,
1.154 + gfxCornerSizes* aCornerRadii,
1.155 + const gfxPoint& aBlurStdDev,
1.156 + const gfxRGBA& aShadowColor,
1.157 + const gfxRect& aDirtyRect,
1.158 + const gfxRect& aSkipRect)
1.159 +{
1.160 + gfxIntSize blurRadius = CalculateBlurRadius(aBlurStdDev);
1.161 +
1.162 + // Create the temporary surface for blurring
1.163 + gfxAlphaBoxBlur blur;
1.164 + gfxContext *dest = blur.Init(aRect, gfxIntSize(), blurRadius, &aDirtyRect, &aSkipRect);
1.165 +
1.166 + if (!dest) {
1.167 + return;
1.168 + }
1.169 +
1.170 + gfxRect shadowGfxRect = aRect;
1.171 + shadowGfxRect.Round();
1.172 +
1.173 + dest->NewPath();
1.174 + if (aCornerRadii) {
1.175 + dest->RoundedRectangle(shadowGfxRect, *aCornerRadii);
1.176 + } else {
1.177 + dest->Rectangle(shadowGfxRect);
1.178 + }
1.179 + dest->Fill();
1.180 +
1.181 + aDestinationCtx->SetColor(aShadowColor);
1.182 + blur.Paint(aDestinationCtx);
1.183 +}
