gecko-dev/gfx/thebes/gfxDrawable.cpp

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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is Markus Stange.
* Portions created by the Initial Developer are Copyright (C) 2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "gfxDrawable.h"
#include "gfxASurface.h"
#include "gfxContext.h"
#include "gfxPlatform.h"
gfxSurfaceDrawable::gfxSurfaceDrawable(gfxASurface* aSurface,
const gfxIntSize aSize,
const gfxMatrix aTransform)
: gfxDrawable(aSize)
, mSurface(aSurface)
, mTransform(aTransform)
{
}
static gfxMatrix
DeviceToImageTransform(gfxContext* aContext,
const gfxMatrix& aUserSpaceToImageSpace)
{
gfxFloat deviceX, deviceY;
nsRefPtr<gfxASurface> currentTarget =
aContext->CurrentSurface(&deviceX, &deviceY);
gfxMatrix currentMatrix = aContext->CurrentMatrix();
gfxMatrix deviceToUser = gfxMatrix(currentMatrix).Invert();
deviceToUser.Translate(-gfxPoint(-deviceX, -deviceY));
return gfxMatrix(deviceToUser).Multiply(aUserSpaceToImageSpace);
}
static void
PreparePatternForUntiledDrawing(gfxPattern* aPattern,
const gfxMatrix& aDeviceToImage,
gfxASurface::gfxSurfaceType aSurfaceType,
const gfxPattern::GraphicsFilter aDefaultFilter)
{
// In theory we can handle this using cairo's EXTEND_PAD,
// but implementation limitations mean we have to consult
// the surface type.
switch (aSurfaceType) {
case gfxASurface::SurfaceTypeXlib:
case gfxASurface::SurfaceTypeXcb:
{
// See bug 324698. This is a workaround for EXTEND_PAD not being
// implemented correctly on linux in the X server.
//
// Set the filter to CAIRO_FILTER_FAST --- otherwise,
// pixman's sampling will sample transparency for the outside edges
// and we'll get blurry edges. CAIRO_EXTEND_PAD would also work
// here, if available
//
// But don't do this for simple downscales because it's horrible.
// Downscaling means that device-space coordinates are
// scaled *up* to find the image pixel coordinates.
PRBool isDownscale =
aDeviceToImage.xx >= 1.0 && aDeviceToImage.yy >= 1.0 &&
aDeviceToImage.xy == 0.0 && aDeviceToImage.yx == 0.0;
if (!isDownscale) {
aPattern->SetFilter(gfxPattern::FILTER_FAST);
}
break;
}
case gfxASurface::SurfaceTypeQuartz:
case gfxASurface::SurfaceTypeQuartzImage:
// Don't set EXTEND_PAD, Mac seems to be OK. Really?
aPattern->SetFilter(aDefaultFilter);
break;
default:
// turn on EXTEND_PAD.
// This is what we really want for all surface types, if the
// implementation was universally good.
aPattern->SetExtend(gfxPattern::EXTEND_PAD);
aPattern->SetFilter(aDefaultFilter);
break;
}
}
PRBool
gfxSurfaceDrawable::Draw(gfxContext* aContext,
const gfxRect& aFillRect,
PRBool aRepeat,
const gfxPattern::GraphicsFilter& aFilter,
const gfxMatrix& aTransform)
{
nsRefPtr<gfxPattern> pattern = new gfxPattern(mSurface);
if (aRepeat) {
pattern->SetExtend(gfxPattern::EXTEND_REPEAT);
pattern->SetFilter(aFilter);
} else {
nsRefPtr<gfxASurface> currentTarget = aContext->CurrentSurface();
gfxASurface::gfxSurfaceType surfaceType = currentTarget->GetType();
gfxMatrix deviceSpaceToImageSpace =
DeviceToImageTransform(aContext, aTransform);
PreparePatternForUntiledDrawing(pattern, deviceSpaceToImageSpace,
surfaceType, aFilter);
}
#ifdef MOZ_GFX_OPTIMIZE_MOBILE
pattern->SetFilter(gfxPattern::FILTER_FAST);
#endif
pattern->SetMatrix(gfxMatrix(aTransform).Multiply(mTransform));
aContext->NewPath();
aContext->SetPattern(pattern);
aContext->Rectangle(aFillRect);
aContext->Fill();
return PR_TRUE;
}
gfxCallbackDrawable::gfxCallbackDrawable(gfxDrawingCallback* aCallback,
const gfxIntSize aSize)
: gfxDrawable(aSize)
, mCallback(aCallback)
{
}
already_AddRefed<gfxSurfaceDrawable>
gfxCallbackDrawable::MakeSurfaceDrawable(const gfxPattern::GraphicsFilter aFilter)
{
nsRefPtr<gfxASurface> surface =
gfxPlatform::GetPlatform()->CreateOffscreenSurface(mSize, gfxASurface::ImageFormatARGB32);
if (!surface || surface->CairoStatus() != 0)
return nsnull;
nsRefPtr<gfxContext> ctx = new gfxContext(surface);
Draw(ctx, gfxRect(0, 0, mSize.width, mSize.height), PR_FALSE, aFilter);
nsRefPtr<gfxSurfaceDrawable> drawable = new gfxSurfaceDrawable(surface, mSize);
return drawable.forget();
}
PRBool
gfxCallbackDrawable::Draw(gfxContext* aContext,
const gfxRect& aFillRect,
PRBool aRepeat,
const gfxPattern::GraphicsFilter& aFilter,
const gfxMatrix& aTransform)
{
if (aRepeat && !mSurfaceDrawable) {
mSurfaceDrawable = MakeSurfaceDrawable(aFilter);
}
if (mSurfaceDrawable)
return mSurfaceDrawable->Draw(aContext, aFillRect, aRepeat, aFilter,
aTransform);
if (mCallback)
return (*mCallback)(aContext, aFillRect, aFilter, aTransform);
return PR_FALSE;
}
gfxPatternDrawable::gfxPatternDrawable(gfxPattern* aPattern,
const gfxIntSize aSize)
: gfxDrawable(aSize)
, mPattern(aPattern)
{
}
class DrawingCallbackFromDrawable : public gfxDrawingCallback {
public:
DrawingCallbackFromDrawable(gfxDrawable* aDrawable)
: mDrawable(aDrawable) {
NS_ASSERTION(aDrawable, "aDrawable is null!");
}
virtual ~DrawingCallbackFromDrawable() {}
virtual PRBool operator()(gfxContext* aContext,
const gfxRect& aFillRect,
const gfxPattern::GraphicsFilter& aFilter,
const gfxMatrix& aTransform = gfxMatrix())
{
return mDrawable->Draw(aContext, aFillRect, PR_FALSE, aFilter,
aTransform);
}
private:
nsRefPtr<gfxDrawable> mDrawable;
};
already_AddRefed<gfxCallbackDrawable>
gfxPatternDrawable::MakeCallbackDrawable()
{
nsRefPtr<gfxDrawingCallback> callback =
new DrawingCallbackFromDrawable(this);
nsRefPtr<gfxCallbackDrawable> callbackDrawable =
new gfxCallbackDrawable(callback, mSize);
return callbackDrawable.forget();
}
PRBool
gfxPatternDrawable::Draw(gfxContext* aContext,
const gfxRect& aFillRect,
PRBool aRepeat,
const gfxPattern::GraphicsFilter& aFilter,
const gfxMatrix& aTransform)
{
if (!mPattern)
return PR_FALSE;
if (aRepeat) {
// We can't use mPattern directly: We want our repeated tiles to have
// the size mSize, which might not be the case in mPattern.
// So we need to draw mPattern into a surface of size mSize, create
// a pattern from the surface and draw that pattern.
// gfxCallbackDrawable and gfxSurfaceDrawable already know how to do
// those things, so we use them here. Drawing mPattern into the surface
// will happen through this Draw() method with aRepeat = PR_FALSE.
nsRefPtr<gfxCallbackDrawable> callbackDrawable = MakeCallbackDrawable();
return callbackDrawable->Draw(aContext, aFillRect, PR_TRUE, aFilter,
aTransform);
}
aContext->NewPath();
gfxMatrix oldMatrix = mPattern->GetMatrix();
mPattern->SetMatrix(gfxMatrix(aTransform).Multiply(oldMatrix));
aContext->SetPattern(mPattern);
aContext->Rectangle(aFillRect);
aContext->Fill();
mPattern->SetMatrix(oldMatrix);
return PR_TRUE;
}