mirror of
https://github.com/rn10950/RetroZilla.git
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321 lines
10 KiB
C++
321 lines
10 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Vladimir Vukicevic <vladimir@pobox.com>
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* Portions created by the Initial Developer are Copyright (C) 2004
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Vladimir Vukicevic <vladimir@pobox.com> (original author)
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsHTMLParts.h"
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#include "nsCOMPtr.h"
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#include "nsIServiceManager.h"
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#include "nsLayoutAtoms.h"
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#include "nsHTMLCanvasFrame.h"
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#include "nsICanvasElement.h"
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#include "nsTransform2D.h"
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nsresult
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NS_NewHTMLCanvasFrame(nsIPresShell* aPresShell, nsIFrame** aNewFrame)
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{
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nsHTMLCanvasFrame* it = new (aPresShell) nsHTMLCanvasFrame;
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if (nsnull == it) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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*aNewFrame = it;
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return NS_OK;
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}
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nsHTMLCanvasFrame::nsHTMLCanvasFrame()
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{
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}
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nsHTMLCanvasFrame::~nsHTMLCanvasFrame()
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{
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}
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// We really want a PR_MINMAX to go along with PR_MIN/PR_MAX
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#define MINMAX(_value,_min,_max) \
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((_value) < (_min) \
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? (_min) \
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: ((_value) > (_max) \
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? (_max) \
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: (_value)))
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NS_IMETHODIMP
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nsHTMLCanvasFrame::Reflow(nsPresContext* aPresContext,
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nsHTMLReflowMetrics& aMetrics,
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const nsHTMLReflowState& aReflowState,
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nsReflowStatus& aStatus)
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{
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DO_GLOBAL_REFLOW_COUNT("nsHTMLCanvasFrame", aReflowState.reason);
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DISPLAY_REFLOW(aPresContext, this, aReflowState, aMetrics, aStatus);
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NS_FRAME_TRACE(NS_FRAME_TRACE_CALLS,
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("enter nsHTMLCanvasFrame::Reflow: availSize=%d,%d",
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aReflowState.availableWidth, aReflowState.availableHeight));
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NS_PRECONDITION(mState & NS_FRAME_IN_REFLOW, "frame is not in reflow");
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aStatus = NS_FRAME_COMPLETE;
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nsCOMPtr<nsICanvasElement> canvas(do_QueryInterface(GetContent()));
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NS_ENSURE_TRUE(canvas, NS_ERROR_FAILURE);
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PRUint32 w, h;
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nsresult rv = canvas->GetSize (&w, &h);
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NS_ENSURE_SUCCESS(rv, rv);
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float p2t = GetPresContext()->PixelsToTwips();
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mCanvasSize.SizeTo(NSIntPixelsToTwips(w, p2t), NSIntPixelsToTwips(h, p2t));
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if (aReflowState.mComputedWidth == NS_INTRINSICSIZE)
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aMetrics.width = mCanvasSize.width;
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else
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aMetrics.width = aReflowState.mComputedWidth;
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if (aReflowState.mComputedHeight == NS_INTRINSICSIZE)
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aMetrics.height = mCanvasSize.height;
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else
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aMetrics.height = aReflowState.mComputedHeight;
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// clamp
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aMetrics.height = MINMAX(aMetrics.height, aReflowState.mComputedMinHeight, aReflowState.mComputedMaxHeight);
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aMetrics.width = MINMAX(aMetrics.width, aReflowState.mComputedMinWidth, aReflowState.mComputedMaxWidth);
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// stash this away so we can compute our inner area later
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mBorderPadding = aReflowState.mComputedBorderPadding;
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aMetrics.width += mBorderPadding.left + mBorderPadding.right;
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aMetrics.height += mBorderPadding.top + mBorderPadding.bottom;
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if (mPrevInFlow) {
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nscoord y = GetContinuationOffset(&aMetrics.width);
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aMetrics.height -= y + mBorderPadding.top;
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aMetrics.height = PR_MAX(0, aMetrics.height);
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}
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aMetrics.ascent = aMetrics.height;
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aMetrics.descent = 0;
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if (aMetrics.mComputeMEW) {
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aMetrics.SetMEWToActualWidth(aReflowState.mStylePosition->mWidth.GetUnit());
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}
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if (aMetrics.mFlags & NS_REFLOW_CALC_MAX_WIDTH) {
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aMetrics.mMaximumWidth = aMetrics.width;
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}
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aMetrics.mOverflowArea.SetRect(0, 0, aMetrics.width, aMetrics.height);
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FinishAndStoreOverflow(&aMetrics);
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if (mRect.width != aMetrics.width || mRect.height != aMetrics.height) {
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Invalidate(nsRect(0, 0, mRect.width, mRect.height), PR_FALSE);
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}
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NS_FRAME_TRACE(NS_FRAME_TRACE_CALLS,
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("exit nsHTMLCanvasFrame::Reflow: size=%d,%d",
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aMetrics.width, aMetrics.height));
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NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aMetrics);
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return NS_OK;
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}
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// FIXME taken from nsImageFrame, but then had splittable frame stuff
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// removed. That needs to be fixed.
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nsRect
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nsHTMLCanvasFrame::GetInnerArea() const
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{
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nsRect r;
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r.x = mBorderPadding.left;
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r.y = mBorderPadding.top;
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r.width = mRect.width - mBorderPadding.left - mBorderPadding.right;
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r.height = mRect.height - mBorderPadding.top - mBorderPadding.bottom;
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return r;
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}
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NS_IMETHODIMP
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nsHTMLCanvasFrame::Paint(nsPresContext* aPresContext,
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nsIRenderingContext& aRenderingContext,
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const nsRect& aDirtyRect,
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nsFramePaintLayer aWhichLayer,
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PRUint32 aFlags)
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{
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PRBool isVisible;
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if (NS_SUCCEEDED(IsVisibleForPainting(aPresContext, aRenderingContext, PR_TRUE, &isVisible)) &&
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isVisible && mRect.width && mRect.height)
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{
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// If painting is suppressed, we need to stop image painting.
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PRBool paintingSuppressed = PR_FALSE;
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aPresContext->PresShell()->IsPaintingSuppressed(&paintingSuppressed);
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if (paintingSuppressed) {
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return NS_OK;
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}
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// make sure that the rendering context has updated the
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// image frame
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nsCOMPtr<nsICanvasElement> canvas(do_QueryInterface(GetContent()));
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NS_ENSURE_TRUE(canvas, NS_ERROR_FAILURE);
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// from nsImageFrame
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// First paint background and borders, which should be in the
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// FOREGROUND or BACKGROUND paint layer if the element is
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// inline-level or block-level, respectively (bug 36710). (See
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// CSS2 9.5, which is the rationale for paint layers.)
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const nsStyleDisplay* display = GetStyleDisplay();
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nsFramePaintLayer backgroundLayer = display->IsBlockLevel()
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? NS_FRAME_PAINT_LAYER_BACKGROUND
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: NS_FRAME_PAINT_LAYER_FOREGROUND;
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if (aWhichLayer == backgroundLayer) {
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PaintSelf(aPresContext, aRenderingContext, aDirtyRect);
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}
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if (aWhichLayer == NS_FRAME_PAINT_LAYER_FOREGROUND) {
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nsRect inner = GetInnerArea();
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nsTransform2D *tx = nsnull;
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aRenderingContext.GetCurrentTransform(tx);
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float t2p = GetPresContext()->TwipsToPixels();
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float p2t = GetPresContext()->PixelsToTwips();
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if (inner.width != mCanvasSize.width ||
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inner.height != mCanvasSize.height)
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{
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float sx = inner.width / (float) mCanvasSize.width;
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float sy = inner.height / (float) mCanvasSize.height;
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aRenderingContext.PushState();
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aRenderingContext.Translate(inner.x, inner.y);
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aRenderingContext.Scale(sx, sy);
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canvas->RenderContexts(&aRenderingContext);
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aRenderingContext.PopState();
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} else {
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//nsIRenderingContext::AutoPushTranslation(&aRenderingContext, px, py);
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aRenderingContext.PushState();
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aRenderingContext.Translate(inner.x, inner.y);
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canvas->RenderContexts(&aRenderingContext);
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aRenderingContext.PopState();
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}
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}
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}
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return nsFrame::Paint(aPresContext, aRenderingContext, aDirtyRect, aWhichLayer, nsISelectionDisplay::DISPLAY_IMAGES);
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}
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NS_IMETHODIMP
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nsHTMLCanvasFrame::CanContinueTextRun(PRBool& aContinueTextRun) const
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{
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// stolen from nsImageFrame.cpp
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// images really CAN continue text runs, but the textFrame needs to be
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// educated before we can indicate that it can. For now, we handle the fixing up
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// of max element widths in nsLineLayout::VerticalAlignFrames, but hopefully
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// this can be eliminated and the textFrame can be convinced to handle inlines
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// that take up space in text runs.
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aContinueTextRun = PR_FALSE;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsHTMLCanvasFrame::GetContentForEvent(nsPresContext* aPresContext,
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nsEvent* aEvent,
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nsIContent** aContent)
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{
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NS_ENSURE_ARG_POINTER(aContent);
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*aContent = GetContent();
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NS_IF_ADDREF(*aContent);
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return NS_OK;
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}
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nsIAtom*
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nsHTMLCanvasFrame::GetType() const
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{
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return nsLayoutAtoms::HTMLCanvasFrame;
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}
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// get the offset into the content area of the image where aImg starts if it is a continuation.
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// from nsImageFrame
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nscoord
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nsHTMLCanvasFrame::GetContinuationOffset(nscoord* aWidth) const
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{
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nscoord offset = 0;
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if (aWidth) {
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*aWidth = 0;
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}
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if (mPrevInFlow) {
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for (nsIFrame* prevInFlow = mPrevInFlow ; prevInFlow; prevInFlow = prevInFlow->GetPrevInFlow()) {
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nsRect rect = prevInFlow->GetRect();
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if (aWidth) {
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*aWidth = rect.width;
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}
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offset += rect.height;
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}
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offset -= mBorderPadding.top;
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offset = PR_MAX(0, offset);
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}
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return offset;
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}
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#ifdef ACCESSIBILITY
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NS_IMETHODIMP
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nsHTMLCanvasFrame::GetAccessible(nsIAccessible** aAccessible)
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{
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return NS_ERROR_FAILURE;
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}
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#endif
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#ifdef DEBUG
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NS_IMETHODIMP
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nsHTMLCanvasFrame::GetFrameName(nsAString& aResult) const
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{
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return MakeFrameName(NS_LITERAL_STRING("HTMLCanvas"), aResult);
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}
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NS_IMETHODIMP
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nsHTMLCanvasFrame::List(nsPresContext* aPresContext, FILE* out, PRInt32 aIndent) const
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{
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IndentBy(out, aIndent);
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ListTag(out);
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fputs("\n", out);
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return NS_OK;
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}
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#endif
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