gecko/gfx/thebes/gfxBlur.cpp
Benoit Jacob 55e7c24065 Bug 958375 - 4/9 - Make SurfaceFormat a typed enum - r=Bas
Specifically:
  r=Bas for manual changes
  f=Bas for automatic changes
See attachments on the bug for the specific breakdown.
2014-01-10 14:06:16 -05:00

178 lines
5.5 KiB
C++

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "gfxBlur.h"
#include "gfxContext.h"
#include "gfxImageSurface.h"
#include "gfxPlatform.h"
#include "mozilla/gfx/Blur.h"
#include "mozilla/gfx/2D.h"
using namespace mozilla::gfx;
gfxAlphaBoxBlur::gfxAlphaBoxBlur()
: mBlur(nullptr)
{
}
gfxAlphaBoxBlur::~gfxAlphaBoxBlur()
{
mContext = nullptr;
delete mBlur;
}
gfxContext*
gfxAlphaBoxBlur::Init(const gfxRect& aRect,
const gfxIntSize& aSpreadRadius,
const gfxIntSize& aBlurRadius,
const gfxRect* aDirtyRect,
const gfxRect* aSkipRect)
{
mozilla::gfx::Rect rect(Float(aRect.x), Float(aRect.y),
Float(aRect.width), Float(aRect.height));
IntSize spreadRadius(aSpreadRadius.width, aSpreadRadius.height);
IntSize blurRadius(aBlurRadius.width, aBlurRadius.height);
nsAutoPtr<mozilla::gfx::Rect> dirtyRect;
if (aDirtyRect) {
dirtyRect = new mozilla::gfx::Rect(Float(aDirtyRect->x),
Float(aDirtyRect->y),
Float(aDirtyRect->width),
Float(aDirtyRect->height));
}
nsAutoPtr<mozilla::gfx::Rect> skipRect;
if (aSkipRect) {
skipRect = new mozilla::gfx::Rect(Float(aSkipRect->x),
Float(aSkipRect->y),
Float(aSkipRect->width),
Float(aSkipRect->height));
}
mBlur = new AlphaBoxBlur(rect, spreadRadius, blurRadius, dirtyRect, skipRect);
int32_t blurDataSize = mBlur->GetSurfaceAllocationSize();
if (blurDataSize <= 0)
return nullptr;
IntSize size = mBlur->GetSize();
// Make an alpha-only surface to draw on. We will play with the data after
// everything is drawn to create a blur effect.
mData = new unsigned char[blurDataSize];
memset(mData, 0, blurDataSize);
mozilla::RefPtr<DrawTarget> dt =
gfxPlatform::GetPlatform()->CreateDrawTargetForData(mData, size,
mBlur->GetStride(),
SurfaceFormat::A8);
if (!dt) {
nsRefPtr<gfxImageSurface> image =
new gfxImageSurface(mData,
gfxIntSize(size.width, size.height),
mBlur->GetStride(),
gfxImageFormatA8);
dt = Factory::CreateDrawTargetForCairoSurface(image->CairoSurface(), size);
if (!dt) {
return nullptr;
}
}
IntRect irect = mBlur->GetRect();
gfxPoint topleft(irect.TopLeft().x, irect.TopLeft().y);
mContext = new gfxContext(dt);
mContext->Translate(-topleft);
return mContext;
}
void
gfxAlphaBoxBlur::Paint(gfxContext* aDestinationCtx)
{
if (!mContext)
return;
mBlur->Blur(mData);
mozilla::gfx::Rect* dirtyRect = mBlur->GetDirtyRect();
DrawTarget *dest = aDestinationCtx->GetDrawTarget();
if (!dest) {
NS_ERROR("Blurring not supported for Thebes contexts!");
return;
}
mozilla::RefPtr<SourceSurface> mask
= dest->CreateSourceSurfaceFromData(mData,
mBlur->GetSize(),
mBlur->GetStride(),
SurfaceFormat::A8);
if (!mask) {
NS_ERROR("Failed to create mask!");
return;
}
nsRefPtr<gfxPattern> thebesPat = aDestinationCtx->GetPattern();
Pattern* pat = thebesPat->GetPattern(dest, nullptr);
Matrix oldTransform = dest->GetTransform();
Matrix newTransform = oldTransform;
newTransform.Translate(mBlur->GetRect().x, mBlur->GetRect().y);
// Avoid a semi-expensive clip operation if we can, otherwise
// clip to the dirty rect
if (dirtyRect) {
dest->PushClipRect(*dirtyRect);
}
dest->SetTransform(newTransform);
dest->MaskSurface(*pat, mask, Point(0, 0));
dest->SetTransform(oldTransform);
if (dirtyRect) {
dest->PopClip();
}
}
gfxIntSize gfxAlphaBoxBlur::CalculateBlurRadius(const gfxPoint& aStd)
{
mozilla::gfx::Point std(Float(aStd.x), Float(aStd.y));
IntSize size = AlphaBoxBlur::CalculateBlurRadius(std);
return gfxIntSize(size.width, size.height);
}
/* static */ void
gfxAlphaBoxBlur::BlurRectangle(gfxContext *aDestinationCtx,
const gfxRect& aRect,
gfxCornerSizes* aCornerRadii,
const gfxPoint& aBlurStdDev,
const gfxRGBA& aShadowColor,
const gfxRect& aDirtyRect,
const gfxRect& aSkipRect)
{
gfxIntSize blurRadius = CalculateBlurRadius(aBlurStdDev);
// Create the temporary surface for blurring
gfxAlphaBoxBlur blur;
gfxContext *dest = blur.Init(aRect, gfxIntSize(), blurRadius, &aDirtyRect, &aSkipRect);
if (!dest) {
return;
}
gfxRect shadowGfxRect = aRect;
shadowGfxRect.Round();
dest->NewPath();
if (aCornerRadii) {
dest->RoundedRectangle(shadowGfxRect, *aCornerRadii);
} else {
dest->Rectangle(shadowGfxRect);
}
dest->Fill();
aDestinationCtx->SetColor(aShadowColor);
blur.Paint(aDestinationCtx);
}