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#58446

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r=mkaply, a=blizzard
Code from jkobal - prevents garbage while displaying images
This commit is contained in:
mkaply%us.ibm.com 2000-12-05 04:01:13 +00:00
parent 2f1dafa1f5
commit 2b8c94e295
1 changed files with 41 additions and 26 deletions
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67
gfx/src/os2/nsImageOS2.cpp
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@ -231,10 +231,17 @@ nsresult nsImageOS2::Draw( nsIRenderingContext &aContext,
nsDrawingSurfaceOS2 *surf = (nsDrawingSurfaceOS2*) aSurface;
// limit the size of the blit to the amount of the image read in
PRInt32 notLoadedDY = 0;
if( mDecodedY2 < mInfo->cy)
{
notLoadedDY = aSH - PRInt32(float(mDecodedY2/float(mInfo->cy))*aSH);
}
// Set up blit coord array
POINTL aptl[ 4] = { { rcl.xLeft, rcl.yBottom },
POINTL aptl[ 4] = { { rcl.xLeft, rcl.yBottom + notLoadedDY },
{ rcl.xRight, rcl.yTop },
{ aSX, mInfo->cy - aSY - aSH},
{ aSX, mInfo->cy - aSY - aSH + notLoadedDY },
{ aSX + aSW, mInfo->cy - aSY } };
// Don't bother creating HBITMAPs, just use the pel data to GpiDrawBits
@ -418,27 +425,27 @@ nsImageOS2::DrawTile(nsIRenderingContext &aContext, nsDrawingSurface aSurface,
if( (aWidth <= tileWidth/2) || (aHeight <= tileHeight/2))
{
nsDrawingSurfaceOS2 *surf = (nsDrawingSurfaceOS2*) aSurface;
// Find the compatible device context and create a memory one
HDC hdcCompat = GpiQueryDevice( surf->mPS);
DEVOPENSTRUC dop = { 0, 0, 0, 0, 0 };
HDC mDC = DevOpenDC( (HAB)0, OD_MEMORY, "*", 5,
(PDEVOPENDATA) &dop, hdcCompat);
if( DEV_ERROR != mDC)
{
// create the PS
SIZEL sizel = { 0, 0 };
HPS mPS = GpiCreatePS( (HAB)0, mDC, &sizel,
PU_PELS | GPIT_MICRO | GPIA_ASSOC);
if( GPI_ERROR != mPS)
{
// now create a bitmap of the right size
HBITMAP hBmp;
HBITMAP hBmpMask = 0;
BITMAPINFOHEADER2 hdr = { 0 };
hdr.cbFix = sizeof( BITMAPINFOHEADER2);
// Maximum size of tiled area (could do this better)
LONG endWidth = aWidth * 2;
@ -454,31 +461,40 @@ nsImageOS2::DrawTile(nsIRenderingContext &aContext, nsDrawingSurface aSurface,
hdr.cx = endWidth;
hdr.cy = endHeight;
hdr.cPlanes = 1;
// find bitdepth
LONG lBitCount = 0;
DevQueryCaps( hdcCompat, CAPS_COLOR_BITCOUNT, 1, &lBitCount);
hdr.cBitCount = (USHORT) lBitCount;
hBmp = GpiCreateBitmap( mPS, &hdr, 0, 0, 0);
if( GPI_ERROR != hBmp)
{
if( mAlphaDepth != 0)
hBmpMask = GpiCreateBitmap( mPS, &hdr, 0, 0, 0);
nsRect trect( aX0, aY0, tileWidth, tileHeight);
RECTL rcl;
((nsRenderingContextOS2 &)aContext).NS2PM_ININ( trect, rcl); // !! !! !!
// Set up blit coord array
POINTL aptl[ 4] = { { 0, 0 },
{ aWidth - 1, aHeight - 1 },
{ 0, 0 },
{ mInfo->cx, mInfo->cy } };
// Draw bitmap once into temporary PS
GpiSetBitmap( mPS, hBmp);
PRInt32 notLoadedDY = 0;
if( mDecodedY2 < mInfo->cy)
{
// If bitmap not fully loaded, fill unloaded area
notLoadedDY = mInfo->cy - mDecodedY2;
RECTL rect = { 0, 0, aWidth, notLoadedDY };
WinFillRect( mPS, &rect, CLR_BACKGROUND);
}
// Set up blit coord array
POINTL aptl[ 4] = { { 0, notLoadedDY },
{ aWidth - 1, aHeight - 1 },
{ 0, notLoadedDY },
{ mInfo->cx, mInfo->cy } };
// Draw bitmap once into temporary PS
DrawBitmap( mPS, 4, aptl, ROP_SRCCOPY, PR_FALSE);
if( hBmpMask)
{
@ -486,7 +502,7 @@ nsImageOS2::DrawTile(nsIRenderingContext &aContext, nsDrawingSurface aSurface,
DrawBitmap( mPS, 4, aptl, ROP_SRCCOPY, PR_TRUE);
GpiSetBitmap( mPS, hBmp);
}
// Copy bitmap horizontally, doubling each time
while( aWidth < tileWidth)
{
@ -494,8 +510,7 @@ nsImageOS2::DrawTile(nsIRenderingContext &aContext, nsDrawingSurface aSurface,
{ 2*aWidth, aHeight },
{ 0, 0 },
{ aWidth, aHeight } };
GpiBitBlt( mPS, mPS, 4, aptlCopy, ROP_SRCCOPY, 0L);
if( hBmpMask)
{
@ -512,7 +527,7 @@ nsImageOS2::DrawTile(nsIRenderingContext &aContext, nsDrawingSurface aSurface,
{ aWidth, 2*aHeight },
{ 0, 0 },
{ aWidth, aHeight } };
GpiBitBlt( mPS, mPS, 4, aptlCopy, ROP_SRCCOPY, 0L);
if( hBmpMask)
{
@ -522,12 +537,12 @@ nsImageOS2::DrawTile(nsIRenderingContext &aContext, nsDrawingSurface aSurface,
}
aHeight *= 2;
}
POINTL aptlTile[ 4] = { { rcl.xLeft, rcl.yBottom },
{ rcl.xRight + 1, rcl.yTop + 1 },
{ 0, aHeight - tileHeight },
{ tileWidth, aHeight } };
// Copy tiled bitmap into destination PS
if( mAlphaDepth == 0)
{
@ -546,10 +561,10 @@ nsImageOS2::DrawTile(nsIRenderingContext &aContext, nsDrawingSurface aSurface,
GpiSetBitmap( mPS, hBmp);
GpiBitBlt( surf->mPS, mPS, 4, aptlTile, ROP_SRCPAINT, 0L);
}
// Tiling successful
didTile = PR_TRUE;
// Must deselect bitmap from PS before freeing bitmap and PS.
GpiSetBitmap( mPS, NULLHANDLE);
GpiDeleteBitmap( hBmp);