--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/graphicsdeviceinterface/directgdiadaptation/swsrc/swdirectgdidrawresource.cpp Tue Feb 02 01:47:50 2010 +0200
@@ -0,0 +1,895 @@
+// Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).
+// All rights reserved.
+// This component and the accompanying materials are made available
+// under the terms of "Eclipse Public License v1.0"
+// which accompanies this distribution, and is available
+// at the URL "http://www.eclipse.org/legal/epl-v10.html".
+//
+// Initial Contributors:
+// Nokia Corporation - initial contribution.
+//
+// Contributors:
+//
+// Description:
+//
+
+#include "directgdiadapter.h"
+#include "swdirectgdiengine.h"
+#include "swdirectgdiimagesourceimpl.h"
+#include "swdirectgdidriverimpl.h"
+#include <bitdrawinterfaceid.h>
+#include <e32cmn.h>
+#include <bitdraw.h>
+#include <bmalphablend.h>
+#include <graphics/directgdidrawablesource.h>
+#include <pixelformats.h>
+#include "pixelutil.h"
+
+/**
+Helper class to deal with the case of blending 32-bit MAP source into 16-bit target which is not
+supported by screen driver CDrawSixteenBppBitmap implementation.
+
+@publishedPartner
+@prototype
+@deprecated
+*/
+class TDrawDeviceWrapper
+ {
+public:
+ TDrawDeviceWrapper(CFbsDrawDevice* aDrawDevice, CGraphicsContext::TDrawMode aDrawMode);
+ inline void WriteLine(TInt aX, TInt aY, TInt aLength, TUint32* aBuffer, CGraphicsContext::TDrawMode aDrawMode);
+private:
+ inline TUint16 ConvertTo64K(TUint32 aColor);
+ inline TUint16 Blend16MapTo64K(TUint16 aDest, TUint32 aSrc);
+ void BlendLine16MapTo64K(TInt aX, TInt aY, TInt aLength, TUint32* aBuffer, CGraphicsContext::TDrawMode aDrawMode);
+ void OriginalWriteLine(TInt aX, TInt aY, TInt aLength, TUint32* aBuffer, CGraphicsContext::TDrawMode aDrawMode);
+
+private:
+ CFbsDrawDevice* iDrawDevice;
+ TUint32* iBits;
+
+ typedef void (TDrawDeviceWrapper::*TWriteLineFunc)(TInt,TInt,TInt,TUint32*,CGraphicsContext::TDrawMode);
+ TWriteLineFunc iWriteLineFunc;
+ };
+
+TDrawDeviceWrapper::TDrawDeviceWrapper(CFbsDrawDevice* aDrawDevice, CGraphicsContext::TDrawMode aDrawMode):
+ iDrawDevice(aDrawDevice)
+ {
+ TAny* interface = NULL;
+ TInt err = iDrawDevice->GetInterface(KFastBlit2InterfaceID, interface);
+ // interface is guaranted to exist for 16-bit and 32-bit draw device
+ GRAPHICS_ASSERT_DEBUG(err == KErrNone, EDirectGdiPanicUnexpectedError);
+
+ iBits = (TUint32*) reinterpret_cast<MFastBlit2*>(interface)->Bits();
+
+ // setup which funtion to call here rather tha making decision inside WriteLine which is usually called within
+ // a tight scanline loop
+ iWriteLineFunc = iDrawDevice->DisplayMode() == EColor64K && aDrawMode == CGraphicsContext::EDrawModePEN ?
+ &TDrawDeviceWrapper::BlendLine16MapTo64K : &TDrawDeviceWrapper::OriginalWriteLine;
+ }
+
+inline void TDrawDeviceWrapper::WriteLine(TInt aX, TInt aY, TInt aLength, TUint32* aBuffer, CGraphicsContext::TDrawMode aDrawMode)
+ {
+ // calling member functions via pointer to member functions i.e.
+ // (object.*member_fn)(arg)
+ //
+ (this->*iWriteLineFunc)(aX, aY, aLength, aBuffer, aDrawMode);
+ }
+
+void TDrawDeviceWrapper::OriginalWriteLine(TInt aX, TInt aY, TInt aLength, TUint32* aBuffer, CGraphicsContext::TDrawMode aDrawMode)
+ {
+ iDrawDevice->WriteLine(aX, aY, aLength, aBuffer, aDrawMode);
+ }
+
+void TDrawDeviceWrapper::BlendLine16MapTo64K(TInt aX, TInt aY, TInt aLength, TUint32* aBuffer, CGraphicsContext::TDrawMode)
+ {
+ TUint16* pixelPtr = reinterpret_cast<TUint16*>(iBits);
+ pixelPtr += (aY * iDrawDevice->LongWidth()) + aX;
+ const TUint32* bufferPtr = aBuffer;
+ const TUint32* bufferPtrLimit = bufferPtr + aLength;
+
+ while (bufferPtr < bufferPtrLimit)
+ {
+ *pixelPtr = Blend16MapTo64K(*pixelPtr, *bufferPtr);
+ ++bufferPtr;
+ ++pixelPtr;
+ }
+ }
+
+inline TUint16 TDrawDeviceWrapper::ConvertTo64K(TUint32 aSrc)
+ {
+ TInt col = (aSrc & 0x0000f8) >> 3;
+ col |= (aSrc & 0x00fc00) >> 5;
+ col |= (aSrc & 0xf80000) >> 8;
+
+ return col;
+ }
+
+inline TUint16 TDrawDeviceWrapper::Blend16MapTo64K(TUint16 aDst, TUint32 aSrc)
+ {
+ const TInt alpha = aSrc >> 24;
+
+ if(alpha == 0x00)
+ {
+ return aDst;
+ }
+
+ if (alpha == 0xff)
+ {
+ return ConvertTo64K(aSrc);
+ }
+
+ // extract source components from 16MAP
+ const TInt src_rb = aSrc & 0x00ff00ff;
+ const TInt src_g = aSrc & 0x0000ff00;
+ const TInt oneMinusAlpha = 0x0100 - alpha;
+
+ // extract destination components from 64K format
+ TInt dr = (aDst & 0xf800) >> 8;
+ dr += dr >> 5;
+ TInt dg = (aDst & 0x07e0) >> 3;
+ dg += dg >> 6;
+ TInt db = (aDst & 0x001f) << 3;
+ db += db >> 5;
+
+ // combine red and blue components into a word to combine mult in one go
+ TInt dst_rb = (dr << 16) | db;
+ TInt dst_g = dg << 8;
+
+ // dst and src are in pre-multiplied format (64K can be treated both as pre or non-pre)
+ // dst = src + (1-alpha) * dst
+ //
+ dst_rb = (src_rb + ((oneMinusAlpha * dst_rb) >> 8)) & 0x00ff00ff;
+ dst_g = (src_g + ((oneMinusAlpha * dst_g) >> 8)) & 0x0000ff00;
+
+ const TUint32 argb = 0xff000000 | dst_rb | dst_g;
+ return ConvertTo64K(argb);
+ }
+
+//
+// implements MDirectGdiEngine interfaces
+//
+
+/**
+@see MDirectGdiEngine::DrawResource(const TRect&,const RDirectGdiDrawableSource&,const TDesC8&)
+*/
+void CSwDirectGdiEngine::DrawResource(
+ const TRect& aDestRect,
+ const RDirectGdiDrawableSource& aSource,
+ const TDesC8& /*aParam*/)
+ {
+ // DirectGDI reference implementation only support pixel based resource
+ // see CSwDirectGdiDriverImpl::CreateDrawableSource()
+ //
+ CSwDirectGdiImageSourceImpl* imgSrc = NULL;
+ TSize imgSize;
+ if (CheckImageSource(aSource.Handle(), imgSrc, &imgSize) != KErrNone)
+ {
+ return;
+ }
+
+ // drawing resource unscaled with no rotation
+ //
+ DrawResourceCommon(aDestRect, imgSrc, TRect(TPoint(0,0), imgSize), DirectGdi::EGraphicsRotationNone);
+ }
+
+/**
+@see MDirectGdiEngine::DrawResource(const TPoint&,const RDirectGdiDrawableSource&,DirectGdi::TGraphicsRotation)
+*/
+void CSwDirectGdiEngine::DrawResource(const TPoint& aPos,
+ const RDirectGdiDrawableSource& aSource,
+ DirectGdi::TGraphicsRotation aRotation)
+ {
+ CSwDirectGdiImageSourceImpl* imgSrc = NULL;
+ TSize imgSize;
+ if (CheckImageSource(aSource.Handle(), imgSrc, &imgSize) != KErrNone)
+ {
+ return;
+ }
+
+ // drawing resource unscaled
+ //
+ // rotation will be applied before scaling, we must create destination rectangle
+ // that match the size of rotated image
+
+ TRect destRect(aPos, imgSize);
+ if (aRotation==DirectGdi::EGraphicsRotation90 || aRotation==DirectGdi::EGraphicsRotation270)
+ {
+ // keep the top left corner in the same position but swap width and height
+ destRect.SetWidth(imgSize.iHeight);
+ destRect.SetHeight(imgSize.iWidth);
+ }
+
+ DrawResourceCommon(destRect, imgSrc, TRect(TPoint(0,0), imgSize), aRotation);
+ }
+
+/**
+@see MDirectGdiEngine::DrawResource(const TRect&,const RDirectGdiDrawableSource&,DirectGdi::TGraphicsRotation)
+*/
+void CSwDirectGdiEngine::DrawResource(const TRect& aDestRect,
+ const RDirectGdiDrawableSource& aSource,
+ DirectGdi::TGraphicsRotation aRotation)
+ {
+ // aDestRect is not empty when we reach here
+ //
+ CSwDirectGdiImageSourceImpl* imgSrc = NULL;
+ TSize imgSize;
+ if (CheckImageSource(aSource.Handle(), imgSrc, &imgSize) != KErrNone)
+ {
+ return;
+ }
+
+ DrawResourceCommon(aDestRect, imgSrc, TRect(TPoint(0,0), imgSize), aRotation);
+ }
+
+/**
+@see MDirectGdiEngine::DrawResource(const TRect&,const RDirectGdiDrawableSource&,const TRect&,DirectGdi::TGraphicsRotation)
+*/
+void CSwDirectGdiEngine::DrawResource(
+ const TRect& aDestRect,
+ const RDirectGdiDrawableSource& aSource,
+ const TRect& aSrcRect,
+ DirectGdi::TGraphicsRotation aRotation)
+ {
+ // pre:
+ // aDestRect and aSrcRect are not empty
+ //
+ CSwDirectGdiImageSourceImpl* imgSrc = NULL;
+ TSize imgSize;
+ if (CheckImageSource(aSource.Handle(), imgSrc, &imgSize) != KErrNone)
+ {
+ return;
+ }
+
+ // check source rectangle is fully contained within the image resource extent
+ if (aSrcRect.iTl.iX < 0 ||
+ aSrcRect.iTl.iY < 0 ||
+ aSrcRect.iBr.iX > imgSize.iWidth ||
+ aSrcRect.iBr.iY > imgSize.iHeight)
+ {
+ iDriver->SetError(KErrArgument);
+ return;
+ }
+
+ DrawResourceCommon(aDestRect, imgSrc, aSrcRect, aRotation);
+ }
+
+//
+// internal functions
+//
+/**
+Checks image resource is fully constructed and registered with the driver.
+
+@param aHandle A valid handle to an image source.
+@param aImg On return, contains the image source.
+@param aSize If not NULL, will contain the dimensions of the image source.
+@return KErrNone if successful, KErrBadHandle if aHandle is not a valid handle to an image source.
+*/
+TInt CSwDirectGdiEngine::CheckImageSource(TInt aHandle, CSwDirectGdiImageSourceImpl*& aImg, TSize* aSize)
+ {
+ // check image exist
+ if (!iDriver->ValidImageSource(aHandle))
+ {
+ // replace KErrNotFound
+ const TInt err = KErrBadHandle;
+ iDriver->SetError(err);
+ return err;
+ }
+
+ aImg = reinterpret_cast<CSwDirectGdiImageSourceImpl*>(aHandle);
+
+ // RSgImage cannot be created with zero size, so there is no point in validating its size and
+ // simply return image size if requested
+ if (aSize)
+ {
+ *aSize = aImg->Size();
+ }
+
+ return KErrNone;
+ }
+
+/**
+Implements common DrawResource() functionality used by all DrawResource() variants.
+*/
+void CSwDirectGdiEngine::DrawResourceCommon(
+ const TRect& aDestRect,
+ const CSwDirectGdiImageSourceImpl* aImg,
+ const TRect& aSrcRect,
+ DirectGdi::TGraphicsRotation aRotation)
+ {
+ // pre:
+ // aDestRect and aSrcRect are not empty
+ // aSrcRect is within the image extent
+ //
+ // translate relative coord to target absolute coord system
+ TRect destRectAbs(aDestRect);
+ destRectAbs.Move(iOrigin);
+
+ // check whether we need to blend or write
+ const TBool opaqueSource = (!PixelFormatUtil::HasAlpha(aImg->PixelFormat())) && (iDrawMode == DirectGdi::EDrawModePEN);
+ if (opaqueSource)
+ {
+ iDrawMode = DirectGdi::EDrawModeWriteAlpha;
+ }
+
+ // repeat drawing op for each rectangle in the clipping region
+ const TInt numOfRects = iDefaultRegionPtr->Count();
+ for (TInt idx = 0; idx < numOfRects; ++idx)
+ {
+ TRect clipRectAbs = (*iDefaultRegionPtr)[idx];
+ if (!clipRectAbs.Intersects(destRectAbs))
+ {
+ continue;
+ }
+
+ // intersect current clip rect with dest rect to get actual draw area
+ clipRectAbs.Intersection(destRectAbs);
+ DoDrawResource(destRectAbs, aImg, aSrcRect, aRotation, clipRectAbs);
+
+ iDrawDevice->UpdateRegion(clipRectAbs);
+ }
+
+ if (opaqueSource)
+ {
+ iDrawMode = DirectGdi::EDrawModePEN;
+ }
+ }
+
+/**
+Rotate a given rectangle 90 degree clockwise around the specified origin.
+*/
+void CSwDirectGdiEngine::Rotate90(TRect& aRect, const TPoint& aOrigin)
+ {
+ // rotated bottom-left become top-left of rotated rect
+ //
+ TPoint bl(aRect.iTl.iX, aRect.iBr.iY);
+ const TInt w = aRect.Width();
+ const TInt h = aRect.Height();
+
+ const TPoint dbl = bl - aOrigin;
+ bl.iX = aOrigin.iX - dbl.iY;
+ bl.iY = aOrigin.iY + dbl.iX;
+
+ aRect = TRect(bl, TSize(h,w));
+ }
+
+/**
+Rotate a given rectangle 180 degree clockwise around the specified origin.
+*/
+void CSwDirectGdiEngine::Rotate180(TRect& aRect, const TPoint& aOrigin)
+ {
+ // rotated bottom-right become top-left of rotated rect
+ //
+ TPoint br(aRect.iBr);
+ const TSize sz = aRect.Size();
+
+ const TPoint dbr = br - aOrigin;
+ br.iX = aOrigin.iX - dbr.iX;
+ br.iY = aOrigin.iY - dbr.iY;
+
+ aRect = TRect(br, sz);
+ }
+
+/**
+Rotate a given rectangle 270 degree clockwise around the specified origin.
+*/
+void CSwDirectGdiEngine::Rotate270(TRect& aRect, const TPoint& aOrigin)
+ {
+ // rotated top-right become top-left of rotated rect
+ //
+ TPoint tr(aRect.iBr.iX, aRect.iTl.iY);
+ const TInt w = aRect.Width();
+ const TInt h = aRect.Height();
+
+ const TPoint dtr = tr - aOrigin;
+ tr.iX = aOrigin.iX + dtr.iY;
+ tr.iY = aOrigin.iY - dtr.iX;
+
+ aRect = TRect(tr, TSize(h,w));
+ }
+
+/**
+Tests that the size of a given rotated rectangle match the image source extent.
+*/
+TBool CSwDirectGdiEngine::RotatedSizeMatch(const TRect& aDst, const TRect& aSrc, DirectGdi::TGraphicsRotation aRot)
+ {
+ if (aRot==DirectGdi::EGraphicsRotationNone || aRot==DirectGdi::EGraphicsRotation180)
+ {
+ return aDst.Size()==aSrc.Size();
+ }
+ else
+ {
+ return aDst.Width()==aSrc.Height() && aDst.Height()==aSrc.Width();
+ }
+ }
+
+/**
+Draws a rectangular area of resource and apply rotation and/or scaling if requested.
+*/
+void CSwDirectGdiEngine::DoDrawResource(
+ const TRect& aDestRectAbs,
+ const CSwDirectGdiImageSourceImpl* aImg,
+ const TRect& aSrcRect,
+ DirectGdi::TGraphicsRotation aRotation,
+ const TRect& aClipRectAbs)
+ {
+ // pre:
+ // SetClippingRegion() already check that clipping region is always contained
+ // within device full extent.
+
+ // check src rect match the size of rotated dest rect
+ if (RotatedSizeMatch(aDestRectAbs, aSrcRect, aRotation))
+ {
+ // aClipRect is the effective drawing clipped area, it has been intersected with dest rect by the
+ // calling function/DoDrawResourceCommon() and it is not empty when we reach here
+
+ // image size has been checked at the top level DrawResource() no need to check it again
+
+ // use aClipRect to determine how much area should be read from the image and transform
+ // the effective read area into source rect depending on rotation parameter
+
+ // start with aClipRect
+ TRect xformSrcRect(aClipRectAbs);
+ switch (aRotation)
+ {
+ case DirectGdi::EGraphicsRotationNone:
+ // align top-left corner of dest rect with top-left corner of src rect
+ xformSrcRect.Move(aSrcRect.iTl - aDestRectAbs.iTl);
+ break;
+ case DirectGdi::EGraphicsRotation90:
+ {
+ // align top-right corner of dest rect with top-left corner of src rect
+ xformSrcRect.Move(aSrcRect.iTl - TPoint(aDestRectAbs.iBr.iX, aDestRectAbs.iTl.iY));
+ // rotate 270 (-90) degree using top-left corner of src rect as pivot point
+ Rotate270(xformSrcRect, aSrcRect.iTl);
+ }
+ break;
+ case DirectGdi::EGraphicsRotation180:
+ {
+ // align bottom-right corner of dest rect with top-left corner of src rect
+ xformSrcRect.Move(aSrcRect.iTl - aDestRectAbs.iBr);
+ // rotate 180 (-180) degree using top-left corner of src rect as pivot point
+ Rotate180(xformSrcRect, aSrcRect.iTl);
+ }
+ break;
+ case DirectGdi::EGraphicsRotation270:
+ {
+ // align bottom-left corner of dest rect with top-left corner of src rect
+ xformSrcRect.Move(aSrcRect.iTl - TPoint(aDestRectAbs.iTl.iX, aDestRectAbs.iBr.iY));
+ // rotate 90 (-270) degree using top-left corner of src rect as pivot point
+ Rotate90(xformSrcRect, aSrcRect.iTl);
+ }
+ break;
+
+ // no need for extra check, aRotation has been checked at generic layer
+ }
+
+ DoBlitResource(aClipRectAbs.iTl, aImg, xformSrcRect, aRotation);
+ return;
+ }
+
+ DoScaledBlitResource(aDestRectAbs, aImg, aSrcRect, aRotation, aClipRectAbs);
+ }
+
+/**
+Draws a rectangular area of resource rotated with no scaling.
+@panic DGDIAdapter 1009, if the pixel format of the draw device is unknown (debug only).
+*/
+void CSwDirectGdiEngine::DoBlitResource(
+ const TPoint& aDest,
+ const CSwDirectGdiImageSourceImpl* aImg,
+ const TRect& aSrcRect,
+ DirectGdi::TGraphicsRotation aRotation)
+ {
+ // pre:
+ // aDest is the top-left of clipped destination rectangle i.e. intersection of user destination
+ // rectangle with current clipping rect
+ // aSrcRect is rotated clipped read area i.e. effective read area with respect to original
+ // image orientation i.e.it no longer represents user specified source rect.
+
+ // no need to do extra check on parameters here because:
+ // aDest is guaranteed to be within device drawing area
+ // aSrcRect is guaranteed to be within image source area
+
+ const TUidPixelFormat devFormat = PixelFormatUtil::ConvertToPixelFormat(iDrawDevice->DisplayMode());
+ GRAPHICS_ASSERT_DEBUG(devFormat != EUidPixelFormatUnknown, EDirectGdiPanicInvalidDisplayMode);
+
+ const TUidPixelFormat imgFormat = aImg->PixelFormat();
+ const TUint32* imgAddr = reinterpret_cast<TUint32*>(aImg->DataBuffer());
+ const TInt imgStride = aImg->Stride();
+ const TSize imgSize = aImg->Size();
+ const CGraphicsContext::TDrawMode drawMode = GcDrawMode(iDrawMode);
+
+ const TInt width = aSrcRect.Width();
+ const TInt height = aSrcRect.Height();
+ // write scanline starting from top dest row
+ TInt destY = aDest.iY;
+ // setup pixel reader toolkit
+ TPixelBufferReader reader(imgAddr, imgSize, imgStride, imgFormat);
+ TDrawDeviceWrapper writer(iDrawDevice, GcDrawMode(iDrawMode));
+
+ //
+ // special case when rotation is none
+ //
+ if (aRotation == DirectGdi::EGraphicsRotationNone)
+ {
+ TAny* interface = NULL;
+
+ // source and destination format match and using write alpha mode i.e. reduce blit to memcpy
+ if (iDrawMode == DirectGdi::EDrawModeWriteAlpha && devFormat == imgFormat)
+ {
+ TInt err = iDrawDevice->GetInterface(KFastBlit2InterfaceID, interface);
+ if (err == KErrNone)
+ {
+ GRAPHICS_ASSERT_DEBUG(interface, EDirectGdiPanicInvalidPointer);
+ MFastBlit2* fblit = static_cast<MFastBlit2*>(interface);
+ err = fblit->WriteBitmapBlock(aDest, imgAddr, imgStride, imgSize, aSrcRect);
+ if (err == KErrNone)
+ {
+ return;
+ }
+ }
+ }
+
+ // fallback from MFastBlit2 when source and destination format match.
+ // Note that there was previously an optimization added here that used MFlastBlend if
+ // available, however it did not work correctly for some cases using DrawResource so has been
+ // removed from this code. (A source drawn with OpenGLES on to a target in XRGB_8888 format
+ // actually had alpha in the unused channel which was being drawn by MFastBlend)
+ if (devFormat == imgFormat)
+ {
+ for (TInt row=aSrcRect.iTl.iY; row<aSrcRect.iBr.iY; ++row,++destY)
+ {
+ const TPoint pos(aSrcRect.iTl.iX, row);
+ const TUint32* slptr = reader.GetPixelAddr(pos);
+ writer.WriteLine(aDest.iX, destY, width, const_cast<TUint32*>(slptr), drawMode);
+ }
+
+ return;
+ }
+
+ // there is one additional case that can be optimised by eleminating copy when:
+ // rotation : none
+ // scaling : none
+ // dst : opaque
+ // src : has alpha and premultiplied
+ // mode : PEN
+ }
+
+ //
+ // generic cases
+ //
+ // copying is necessary either to convert pixel format or to read back buffer in reverse order
+ // to achieve rotation
+ //
+ const TInt scanLineBytes = iDrawDevice->ScanLineBytes();
+ TUint32* scanLineBuffer = iDrawDevice->ScanLineBuffer();
+ TPtr8 scanLineDes(reinterpret_cast<TUint8*>(scanLineBuffer),scanLineBytes,scanLineBytes);
+
+ // if destination is opaque e.g. RGB_565, XRGB_8888 and the source has alpha, it shall blend
+ // (because iDrawMode is set to WritePEN)
+ // we treat opaque destination as in pre-multiplied format (with alpha value 1), and read the
+ // source in pre-multiplied format too, to enable optimum blending computation i.e.
+ // "src + (1-alpha) * dst"
+ const TUidPixelFormat readFormat = !PixelFormatUtil::HasAlpha(devFormat) &&
+ iDrawMode == DirectGdi::EDrawModePEN ?
+ EUidPixelFormatARGB_8888_PRE : devFormat;
+
+ if (aRotation == DirectGdi::EGraphicsRotationNone)
+ {
+ // general fallback from FastBlendBitmap
+ //
+ const TInt readLen = width;
+ // normal read scanline, left to right
+ //
+ for (TInt row=aSrcRect.iTl.iY; row<aSrcRect.iBr.iY; ++row,++destY)
+ {
+ const TPoint pos(aSrcRect.iTl.iX, row);
+ reader.GetScanLine(scanLineDes,pos, readLen, readFormat, TPixelBufferReader::EReadHorizontal);
+ writer.WriteLine(aDest.iX, destY, readLen, scanLineBuffer, drawMode);
+ }
+ }
+ else if (aRotation == DirectGdi::EGraphicsRotation90)
+ {
+ const TInt readLen = height;
+ // read scanline vertically from bottom to up, and from the lef-most column
+ //
+ for (TInt col=aSrcRect.iTl.iX; col<aSrcRect.iBr.iX; ++col,++destY)
+ {
+ const TPoint pos(col, aSrcRect.iBr.iY-1);
+ reader.GetScanLine(scanLineDes, pos, readLen, readFormat, TPixelBufferReader::EReadVerticalReverse);
+ writer.WriteLine(aDest.iX, destY, readLen, scanLineBuffer, drawMode);
+ }
+ }
+ else if (aRotation == DirectGdi::EGraphicsRotation180)
+ {
+ const TInt readLen = width;
+ // read scanline from right to left, starting from the most bottom scanline
+ //
+ for (TInt row=aSrcRect.iBr.iY-1; row>=aSrcRect.iTl.iY; --row,++destY)
+ {
+ const TPoint pos(aSrcRect.iBr.iX-1, row);
+ reader.GetScanLine(scanLineDes, pos, readLen, readFormat, TPixelBufferReader::EReadHorizontalReverse);
+ writer.WriteLine(aDest.iX, destY, readLen, scanLineBuffer, drawMode);
+ }
+ }
+ else if (aRotation == DirectGdi::EGraphicsRotation270)
+ {
+ const TInt readLen = height;
+ // read scanline vertically top to bottom, and from the right-most column
+ //
+ for (TInt col=aSrcRect.iBr.iX-1; col>=aSrcRect.iTl.iX; --col,++destY)
+ {
+ const TPoint pos(col, aSrcRect.iTl.iY);
+ reader.GetScanLine(scanLineDes, pos, readLen, readFormat, TPixelBufferReader::EReadVertical);
+ writer.WriteLine(aDest.iX, destY, readLen, scanLineBuffer, drawMode);
+ }
+ }
+ }
+
+/**
+Draws a rectangular area of resource rotated and/or scaled up/down.
+@panic DGDIAdapter 1009, if the pixel format of the draw device is unknown (debug only).
+*/
+void CSwDirectGdiEngine::DoScaledBlitResource(
+ const TRect& aDestRectAbs,
+ const CSwDirectGdiImageSourceImpl* aImg,
+ const TRect& aSrcRect,
+ DirectGdi::TGraphicsRotation aRotation,
+ const TRect& aClipRectAbs)
+ {
+ // pre:
+ // aDestRectAbs is the user specified dest rect that has been translated to target coord system. It may
+ // be larger/outside the target drawing area. We must not modify this rect as it will be used to
+ // determine the scaling factor.
+ // aSrcRect is the user specified src rect, it is within the image extent.
+ // aClipRectAbs is the intersection of current clipping rect and aDestRectAbs and is within the
+ // target drawing area.
+
+ const TUidPixelFormat devFormat = PixelFormatUtil::ConvertToPixelFormat(iDrawDevice->DisplayMode());
+ GRAPHICS_ASSERT_DEBUG(devFormat != EUidPixelFormatUnknown, EDirectGdiPanicInvalidDisplayMode);
+
+ const TUint32* imgAddr = reinterpret_cast<TUint32*>(aImg->DataBuffer());
+ const TInt imgStride = aImg->Stride();
+ const TSize imgSize = aImg->Size();
+ const TUidPixelFormat imgFormat = aImg->PixelFormat();
+ const CGraphicsContext::TDrawMode drawMode = GcDrawMode(iDrawMode);
+
+ // if destination is opaque e.g. RGB_565, XRGB_8888 and the source has alpha, it shall blend
+ // (because iDrawMode is set to WritePEN)
+ // we treat opaque destination as in pre-multiplied format (with alpha value 1), and read the
+ // source in pre-multiplied format too, to enable optimum blending computation i.e.
+ // "src + (1-alpha) * dst"
+ const TUidPixelFormat readFormat = !PixelFormatUtil::HasAlpha(devFormat) &&
+ iDrawMode == DirectGdi::EDrawModePEN ?
+ EUidPixelFormatARGB_8888_PRE : devFormat;
+
+ TUint32* scanLineBuffer = iDrawDevice->ScanLineBuffer();
+ const TInt scanLineBytes = iDrawDevice->ScanLineBytes();
+ TPtr8 scanLineDes(reinterpret_cast<TUint8*>(scanLineBuffer), scanLineBytes, scanLineBytes);
+
+ // setup pixel reader toolkit
+ //
+ TPixelBufferReader reader(imgAddr, imgSize, imgStride, imgFormat);
+ TDrawDeviceWrapper writer(iDrawDevice, GcDrawMode(iDrawMode));
+
+ if (aRotation == DirectGdi::EGraphicsRotationNone)
+ {
+ // Note that there was previously an optimization added here that used MFlastBlend if
+ // available, however it did not work correctly for some cases using DrawResource so has been
+ // removed from this code. (A source drawn with OpenGLES on to a target in XRGB_8888 format
+ // actually had alpha in the unused channel which was being drawn by MFastBlend)
+ //
+ const TInt srcLen = aSrcRect.Width();
+ const TInt destLen = aDestRectAbs.Width();
+ const TInt clipLen = aClipRectAbs.Width();
+ const TInt clipPos = aClipRectAbs.iTl.iX - aDestRectAbs.iTl.iX;
+
+ // setup DDA for scaling in Y direction based on src rect and dst rect size
+ // scaling in X direction will be done by GetScaledScanLine()
+ //
+ // setup Y scaler and start from top-left of src/dest to bottom-right of src/dest
+
+ TLinearDDA yScaler;
+ yScaler.Construct(
+ TPoint(aSrcRect.iTl.iY, aDestRectAbs.iTl.iY),
+ TPoint(aSrcRect.iBr.iY, aDestRectAbs.iBr.iY),
+ TLinearDDA::ELeft);
+
+ // move to position of current clip rect top row as the start of dest Y
+ TInt srcY;
+ yScaler.JumpToYCoord2(srcY, aClipRectAbs.iTl.iY);
+
+ // yPos contains mapping between src Y (TPoint.iX) and dest Y (TPoint.iY)
+ TPoint yPos(srcY, aClipRectAbs.iTl.iY);
+
+ // write to target from top to bottom
+ //
+ while (yPos.iY < aClipRectAbs.iBr.iY)
+ {
+ reader.GetScaledScanLine(scanLineDes,
+ TPoint(aSrcRect.iTl.iX, yPos.iX), // src X and Y
+ clipPos, // clipped dest X
+ clipLen,
+ destLen,
+ srcLen,
+ readFormat,
+ TPixelBufferReader::EReadHorizontal);
+
+ // use dest Y here
+ writer.WriteLine(aClipRectAbs.iTl.iX, yPos.iY, clipLen, scanLineBuffer, drawMode);
+
+ // move scaler one position
+ yScaler.NextStep(yPos);
+ };
+ }
+ else if (aRotation == DirectGdi::EGraphicsRotation90)
+ {
+ // we're going to read source vertically from bottom to up, swap relevant bits and pieces
+ // dst-width corresponds to src-height
+ // dst-height corresponds to src-width
+ //
+ const TInt srcLen = aSrcRect.Height();
+ const TInt destLen = aDestRectAbs.Width();
+
+ // the following doesn't change, the amount of pixel read (vertically) will be based on
+ // the drawing area witdh i.e. clip width
+ //
+ const TInt clipLen = aClipRectAbs.Width();
+
+ // offset into read area doesn't change either, it will be translated into some Y position
+ // from bottom row of source image
+ const TInt clipPos = aClipRectAbs.iTl.iX - aDestRectAbs.iTl.iX;
+
+ // setup DDA for scaling in src X direction based on src rect and dst rect size
+ // scaling in src Y direction will be done by GetScaledScanLine(EReadVerticalReverse)
+ //
+ // scaler map dest Y to src X because of 90 degre rotation
+ // start from top row dest, left-most column src to bottom row dest, right-most column src
+ //
+ TLinearDDA xScaler;
+ xScaler.Construct(
+ TPoint(aSrcRect.iTl.iX, aDestRectAbs.iTl.iY),
+ TPoint(aSrcRect.iBr.iX, aDestRectAbs.iBr.iY),
+ TLinearDDA::ELeft);
+
+ // move to position of current clip rect top row as the start of src X
+ TInt srcX;
+ xScaler.JumpToYCoord2(srcX, aClipRectAbs.iTl.iY);
+
+ // xPos contains mapping between src X (TPoint.iX) and dest Y (TPoint.iY)
+ TPoint xPos(srcX, aClipRectAbs.iTl.iY);
+
+ // write to target from top to bottom
+ //
+ while (xPos.iY < aClipRectAbs.iBr.iY)
+ {
+ // read pixel vertically from left column to right
+ reader.GetScaledScanLine(scanLineDes,
+ TPoint(xPos.iX, aSrcRect.iBr.iY - 1), // src X, src Y
+ clipPos, // distance from bottom source
+ clipLen,
+ destLen,
+ srcLen,
+ readFormat,
+ TPixelBufferReader::EReadVerticalReverse);
+
+ // use dest Y here
+ writer.WriteLine(aClipRectAbs.iTl.iX, xPos.iY, clipLen, scanLineBuffer, drawMode);
+
+ // move scaler one position
+ xScaler.NextStep(xPos);
+ }
+ }
+ else if (aRotation == DirectGdi::EGraphicsRotation180)
+ {
+ const TInt srcLen = aSrcRect.Width();
+ const TInt destLen = aDestRectAbs.Width();
+ const TInt clipLen = aClipRectAbs.Width();
+
+ // clipPos doesn't need to be inverted (using iBr.iX) because the yScaler below
+ // will do that for us (by stepping backward)
+ //
+ const TInt clipPos = aClipRectAbs.iTl.iX - aDestRectAbs.iTl.iX;
+
+ // setup DDA for scaling in Y direction based on src rect and dst rect size
+ // scaling in X direction will be done by GetScaledScanLine()
+ //
+ // setup Y scaler and start from bottom-right of src/dest to top-left of src/dest
+ // to do backward stepping (src Y inversion)
+
+ TLinearDDA yScaler;
+ yScaler.Construct(
+ // we starting from 1st pixel from bottom of source image, we need to
+ // step back 1 position as bottom-row coord is beyond the last pixel in the source rect
+ TPoint(aSrcRect.iBr.iY - 1, aDestRectAbs.iTl.iY),
+ TPoint(aSrcRect.iTl.iY - 1, aDestRectAbs.iBr.iY),
+ TLinearDDA::ELeft);
+
+ // move to position of current clip rect top row as the start of dest Y
+ // which will calculate inverted src Y distance from bottom of source rectangle
+ TInt invSrcY;
+ yScaler.JumpToYCoord2(invSrcY, aClipRectAbs.iTl.iY);
+
+ // yPos contains mapping between inverted src Y (TPoint.iX) and dest Y (TPoint.iY)
+ TPoint yPos(invSrcY, aClipRectAbs.iTl.iY);
+
+ // write to target from top to bottom
+ //
+ while (yPos.iY < aClipRectAbs.iBr.iY)
+ {
+ // read scanline from righ to left i.e. use aSrcRect.iBr.iX-1 (last column)
+ // as starting src X value
+ reader.GetScaledScanLine(scanLineDes,
+ TPoint(aSrcRect.iBr.iX - 1, yPos.iX), // src X and inverted src Y
+ clipPos, // clipped dest X
+ clipLen,
+ destLen,
+ srcLen,
+ readFormat,
+ TPixelBufferReader::EReadHorizontalReverse);
+
+ // use dest Y here
+ writer.WriteLine(aClipRectAbs.iTl.iX, yPos.iY, clipLen, scanLineBuffer, drawMode);
+
+ // move scaler one position
+ yScaler.NextStep(yPos);
+ }
+ }
+ else if(aRotation == DirectGdi::EGraphicsRotation270)
+ {
+ // we're going to read source vertically from top to bottom, swap relevant bits and pieces
+ // dst-width corresponds to src-height
+ // dst-height corresponds to src-width
+ const TInt srcLen = aSrcRect.Height();
+ const TInt destLen = aDestRectAbs.Width();
+
+ // the following doesn't change, the amount of pixel read (vertically) will be based on
+ // the drawing area witdh i.e. clip width
+ const TInt clipLen = aClipRectAbs.Width();
+
+ // offset into read area doesn't change either, it will be translated into some Y position
+ // from top row of source image
+ const TInt clipPos = aClipRectAbs.iTl.iX - aDestRectAbs.iTl.iX;
+
+ // setup DDA for scaling in src X direction based on src rect and dst rect size
+ // scaling in src Y direction will be done by GetScaledScanLine(EReadVertical)
+ //
+ // scaler map dest Y to src X because of 270 degre rotation
+ // start from top row dest, right-most column src to bottom row dest, left-most column src
+
+ TLinearDDA xScaler;
+ xScaler.Construct(
+ // decrement 1 pixel to get into last pixel within source
+ TPoint(aSrcRect.iBr.iX - 1, aDestRectAbs.iTl.iY),
+ TPoint(aSrcRect.iTl.iX - 1, aDestRectAbs.iBr.iY),
+ TLinearDDA::ELeft);
+
+ // move to position of current clip rect top row as the start of src X
+ TInt srcX;
+ xScaler.JumpToYCoord2(srcX, aClipRectAbs.iTl.iY);
+ // xPos contains mapping between src X (TPoint.iX) and dest Y (TPoint.iY)
+ TPoint xPos(srcX, aClipRectAbs.iTl.iY);
+
+ // write to target from top to bottom
+ //
+ while (xPos.iY < aClipRectAbs.iBr.iY)
+ {
+ // read pixel vertically from left column to right
+ reader.GetScaledScanLine(scanLineDes,
+ TPoint(xPos.iX, aSrcRect.iTl.iY), // src X, src Y
+ clipPos, // distance from bottom source
+ clipLen,
+ destLen,
+ srcLen,
+ readFormat,
+ TPixelBufferReader::EReadVertical);
+
+ // use dest Y here
+ writer.WriteLine(aClipRectAbs.iTl.iX, xPos.iY, clipLen, scanLineBuffer, drawMode);
+
+ // move scaler one position
+ xScaler.NextStep(xPos);
+ }
+ }
+ }