gecko-dev/gfx/thebes/gfxQuartzNativeDrawing.cpp

90 lines
2.9 KiB
C++

/* -*- Mode: C++; tab-width: 20; 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 "gfxQuartzNativeDrawing.h"
#include "gfxQuartzSurface.h"
#include "gfxPlatform.h"
#include "cairo-quartz.h"
using namespace mozilla::gfx;
using namespace mozilla;
gfxQuartzNativeDrawing::gfxQuartzNativeDrawing(gfxContext* ctx,
const gfxRect& nativeRect,
gfxFloat aBackingScale)
: mContext(ctx)
, mNativeRect(nativeRect)
, mBackingScale(aBackingScale)
, mCGContext(nullptr)
{
mNativeRect.RoundOut();
}
CGContextRef
gfxQuartzNativeDrawing::BeginNativeDrawing()
{
NS_ASSERTION(!mCGContext, "BeginNativeDrawing called when drawing already in progress");
if (mContext->IsCairo()) {
// We're past that now. Any callers that still supply a Cairo context
// don't deserve native theming.
NS_WARNING("gfxQuartzNativeDrawing being used with a gfxContext that is not backed by a DrawTarget");
return nullptr;
}
DrawTarget *dt = mContext->GetDrawTarget();
if (dt->GetBackendType() != BackendType::COREGRAPHICS || dt->IsDualDrawTarget()) {
IntSize backingSize(NSToIntFloor(mNativeRect.width * mBackingScale),
NSToIntFloor(mNativeRect.height * mBackingScale));
if (backingSize.IsEmpty()) {
return nullptr;
}
mDrawTarget = Factory::CreateDrawTarget(BackendType::COREGRAPHICS, backingSize, SurfaceFormat::B8G8R8A8);
Matrix transform;
transform.Scale(mBackingScale, mBackingScale);
transform.Translate(-mNativeRect.x, -mNativeRect.y);
mDrawTarget->SetTransform(transform);
dt = mDrawTarget;
}
mCGContext = mBorrowedContext.Init(dt);
MOZ_ASSERT(mCGContext);
return mCGContext;
}
void
gfxQuartzNativeDrawing::EndNativeDrawing()
{
NS_ASSERTION(mCGContext, "EndNativeDrawing called without BeginNativeDrawing");
MOZ_ASSERT(!mContext->IsCairo(), "BeginNativeDrawing succeeded with cairo context?");
mBorrowedContext.Finish();
if (mDrawTarget) {
DrawTarget *dest = mContext->GetDrawTarget();
RefPtr<SourceSurface> source = mDrawTarget->Snapshot();
IntSize backingSize(NSToIntFloor(mNativeRect.width * mBackingScale),
NSToIntFloor(mNativeRect.height * mBackingScale));
Matrix oldTransform = dest->GetTransform();
Matrix newTransform = oldTransform;
newTransform.Translate(mNativeRect.x, mNativeRect.y);
newTransform.Scale(1.0f / mBackingScale, 1.0f / mBackingScale);
dest->SetTransform(newTransform);
dest->DrawSurface(source,
gfx::Rect(0, 0, backingSize.width, backingSize.height),
gfx::Rect(0, 0, backingSize.width, backingSize.height));
dest->SetTransform(oldTransform);
}
}