mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-02 15:15:23 +00:00
301 lines
9.3 KiB
C++
301 lines
9.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* ***** 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
|
|
* Vladimir Vukicevic <vladimir@pobox.com>
|
|
* Portions created by the Initial Developer are Copyright (C) 2004
|
|
* the Initial Developer. All Rights Reserved.
|
|
*
|
|
* Contributor(s):
|
|
* Vladimir Vukicevic <vladimir@pobox.com> (original author)
|
|
*
|
|
* Alternatively, the contents of this file may be used under the terms of
|
|
* either of 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 ***** */
|
|
|
|
/* rendering object for the HTML <canvas> element */
|
|
|
|
#include "nsHTMLParts.h"
|
|
#include "nsCOMPtr.h"
|
|
#include "nsIServiceManager.h"
|
|
#include "nsLayoutAtoms.h"
|
|
|
|
#include "nsHTMLCanvasFrame.h"
|
|
#include "nsICanvasElement.h"
|
|
#include "nsDisplayList.h"
|
|
|
|
#include "nsTransform2D.h"
|
|
|
|
nsIFrame*
|
|
NS_NewHTMLCanvasFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
|
|
{
|
|
return new (aPresShell) nsHTMLCanvasFrame(aContext);
|
|
}
|
|
|
|
nsHTMLCanvasFrame::~nsHTMLCanvasFrame()
|
|
{
|
|
}
|
|
|
|
// We really want a PR_MINMAX to go along with PR_MIN/PR_MAX
|
|
#define MINMAX(_value,_min,_max) \
|
|
((_value) < (_min) \
|
|
? (_min) \
|
|
: ((_value) > (_max) \
|
|
? (_max) \
|
|
: (_value)))
|
|
|
|
NS_IMETHODIMP
|
|
nsHTMLCanvasFrame::Reflow(nsPresContext* aPresContext,
|
|
nsHTMLReflowMetrics& aMetrics,
|
|
const nsHTMLReflowState& aReflowState,
|
|
nsReflowStatus& aStatus)
|
|
{
|
|
DO_GLOBAL_REFLOW_COUNT("nsHTMLCanvasFrame", aReflowState.reason);
|
|
DISPLAY_REFLOW(aPresContext, this, aReflowState, aMetrics, aStatus);
|
|
NS_FRAME_TRACE(NS_FRAME_TRACE_CALLS,
|
|
("enter nsHTMLCanvasFrame::Reflow: availSize=%d,%d",
|
|
aReflowState.availableWidth, aReflowState.availableHeight));
|
|
|
|
NS_PRECONDITION(mState & NS_FRAME_IN_REFLOW, "frame is not in reflow");
|
|
|
|
aStatus = NS_FRAME_COMPLETE;
|
|
|
|
nsCOMPtr<nsICanvasElement> canvas(do_QueryInterface(GetContent()));
|
|
NS_ENSURE_TRUE(canvas, NS_ERROR_FAILURE);
|
|
|
|
PRUint32 w, h;
|
|
nsresult rv = canvas->GetSize (&w, &h);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
float p2t = GetPresContext()->PixelsToTwips();
|
|
|
|
mCanvasSize.SizeTo(NSIntPixelsToTwips(w, p2t), NSIntPixelsToTwips(h, p2t));
|
|
|
|
if (aReflowState.mComputedWidth == NS_INTRINSICSIZE)
|
|
aMetrics.width = mCanvasSize.width;
|
|
else
|
|
aMetrics.width = aReflowState.mComputedWidth;
|
|
|
|
if (aReflowState.mComputedHeight == NS_INTRINSICSIZE)
|
|
aMetrics.height = mCanvasSize.height;
|
|
else
|
|
aMetrics.height = aReflowState.mComputedHeight;
|
|
|
|
// clamp
|
|
aMetrics.height = MINMAX(aMetrics.height, aReflowState.mComputedMinHeight, aReflowState.mComputedMaxHeight);
|
|
aMetrics.width = MINMAX(aMetrics.width, aReflowState.mComputedMinWidth, aReflowState.mComputedMaxWidth);
|
|
|
|
// stash this away so we can compute our inner area later
|
|
mBorderPadding = aReflowState.mComputedBorderPadding;
|
|
|
|
aMetrics.width += mBorderPadding.left + mBorderPadding.right;
|
|
aMetrics.height += mBorderPadding.top + mBorderPadding.bottom;
|
|
|
|
if (GetPrevInFlow()) {
|
|
nscoord y = GetContinuationOffset(&aMetrics.width);
|
|
aMetrics.height -= y + mBorderPadding.top;
|
|
aMetrics.height = PR_MAX(0, aMetrics.height);
|
|
}
|
|
|
|
aMetrics.ascent = aMetrics.height;
|
|
aMetrics.descent = 0;
|
|
|
|
if (aMetrics.mComputeMEW) {
|
|
aMetrics.SetMEWToActualWidth(aReflowState.mStylePosition->mWidth.GetUnit());
|
|
}
|
|
|
|
if (aMetrics.mFlags & NS_REFLOW_CALC_MAX_WIDTH) {
|
|
aMetrics.mMaximumWidth = aMetrics.width;
|
|
}
|
|
aMetrics.mOverflowArea.SetRect(0, 0, aMetrics.width, aMetrics.height);
|
|
FinishAndStoreOverflow(&aMetrics);
|
|
|
|
if (mRect.width != aMetrics.width || mRect.height != aMetrics.height) {
|
|
Invalidate(nsRect(0, 0, mRect.width, mRect.height), PR_FALSE);
|
|
}
|
|
|
|
NS_FRAME_TRACE(NS_FRAME_TRACE_CALLS,
|
|
("exit nsHTMLCanvasFrame::Reflow: size=%d,%d",
|
|
aMetrics.width, aMetrics.height));
|
|
NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aMetrics);
|
|
return NS_OK;
|
|
}
|
|
|
|
// FIXME taken from nsImageFrame, but then had splittable frame stuff
|
|
// removed. That needs to be fixed.
|
|
nsRect
|
|
nsHTMLCanvasFrame::GetInnerArea() const
|
|
{
|
|
nsRect r;
|
|
r.x = mBorderPadding.left;
|
|
r.y = mBorderPadding.top;
|
|
r.width = mRect.width - mBorderPadding.left - mBorderPadding.right;
|
|
r.height = mRect.height - mBorderPadding.top - mBorderPadding.bottom;
|
|
return r;
|
|
}
|
|
|
|
void
|
|
nsHTMLCanvasFrame::PaintCanvas(nsIRenderingContext& aRenderingContext,
|
|
const nsRect& aDirtyRect, nsPoint aPt)
|
|
{
|
|
nsRect inner = GetInnerArea() + aPt;
|
|
|
|
nsCOMPtr<nsICanvasElement> canvas(do_QueryInterface(GetContent()));
|
|
if (!canvas)
|
|
return;
|
|
|
|
// XXXvlad clip to aDirtyRect!
|
|
|
|
if (inner.Size() != mCanvasSize)
|
|
{
|
|
float sx = inner.width / (float) mCanvasSize.width;
|
|
float sy = inner.height / (float) mCanvasSize.height;
|
|
|
|
aRenderingContext.PushState();
|
|
aRenderingContext.Translate(inner.x, inner.y);
|
|
aRenderingContext.Scale(sx, sy);
|
|
|
|
canvas->RenderContexts(&aRenderingContext);
|
|
|
|
aRenderingContext.PopState();
|
|
} else {
|
|
//nsIRenderingContext::AutoPushTranslation(&aRenderingContext, px, py);
|
|
|
|
aRenderingContext.PushState();
|
|
aRenderingContext.Translate(inner.x, inner.y);
|
|
|
|
canvas->RenderContexts(&aRenderingContext);
|
|
|
|
aRenderingContext.PopState();
|
|
}
|
|
}
|
|
|
|
static void PaintCanvas(nsIFrame* aFrame, nsIRenderingContext* aCtx,
|
|
const nsRect& aDirtyRect, nsPoint aPt)
|
|
{
|
|
NS_STATIC_CAST(nsHTMLCanvasFrame*, aFrame)->PaintCanvas(*aCtx, aDirtyRect, aPt);
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsHTMLCanvasFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
|
|
const nsRect& aDirtyRect,
|
|
const nsDisplayListSet& aLists)
|
|
{
|
|
if (!IsVisibleForPainting(aBuilder))
|
|
return NS_OK;
|
|
|
|
nsresult rv = DisplayBorderBackgroundOutline(aBuilder, aLists);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
rv = aLists.Content()->AppendNewToTop(new (aBuilder)
|
|
nsDisplayGeneric(this, ::PaintCanvas, "Canvas"));
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
return DisplaySelectionOverlay(aBuilder, aLists,
|
|
nsISelectionDisplay::DISPLAY_IMAGES);
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsHTMLCanvasFrame::CanContinueTextRun(PRBool& aContinueTextRun) const
|
|
{
|
|
// stolen from nsImageFrame.cpp
|
|
// images really CAN continue text runs, but the textFrame needs to be
|
|
// educated before we can indicate that it can. For now, we handle the fixing up
|
|
// of max element widths in nsLineLayout::VerticalAlignFrames, but hopefully
|
|
// this can be eliminated and the textFrame can be convinced to handle inlines
|
|
// that take up space in text runs.
|
|
|
|
aContinueTextRun = PR_FALSE;
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsHTMLCanvasFrame::GetContentForEvent(nsPresContext* aPresContext,
|
|
nsEvent* aEvent,
|
|
nsIContent** aContent)
|
|
{
|
|
NS_ENSURE_ARG_POINTER(aContent);
|
|
*aContent = GetContent();
|
|
NS_IF_ADDREF(*aContent);
|
|
return NS_OK;
|
|
}
|
|
|
|
nsIAtom*
|
|
nsHTMLCanvasFrame::GetType() const
|
|
{
|
|
return nsLayoutAtoms::HTMLCanvasFrame;
|
|
}
|
|
|
|
// get the offset into the content area of the image where aImg starts if it is a continuation.
|
|
// from nsImageFrame
|
|
nscoord
|
|
nsHTMLCanvasFrame::GetContinuationOffset(nscoord* aWidth) const
|
|
{
|
|
nscoord offset = 0;
|
|
if (aWidth) {
|
|
*aWidth = 0;
|
|
}
|
|
|
|
if (GetPrevInFlow()) {
|
|
for (nsIFrame* prevInFlow = GetPrevInFlow() ; prevInFlow; prevInFlow = prevInFlow->GetPrevInFlow()) {
|
|
nsRect rect = prevInFlow->GetRect();
|
|
if (aWidth) {
|
|
*aWidth = rect.width;
|
|
}
|
|
offset += rect.height;
|
|
}
|
|
offset -= mBorderPadding.top;
|
|
offset = PR_MAX(0, offset);
|
|
}
|
|
return offset;
|
|
}
|
|
|
|
#ifdef ACCESSIBILITY
|
|
NS_IMETHODIMP
|
|
nsHTMLCanvasFrame::GetAccessible(nsIAccessible** aAccessible)
|
|
{
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
#endif
|
|
|
|
#ifdef DEBUG
|
|
NS_IMETHODIMP
|
|
nsHTMLCanvasFrame::GetFrameName(nsAString& aResult) const
|
|
{
|
|
return MakeFrameName(NS_LITERAL_STRING("HTMLCanvas"), aResult);
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsHTMLCanvasFrame::List(FILE* out, PRInt32 aIndent) const
|
|
{
|
|
IndentBy(out, aIndent);
|
|
ListTag(out);
|
|
fputs("\n", out);
|
|
return NS_OK;
|
|
}
|
|
#endif
|
|
|