imgFrame::SurfaceWithFormat
imgFrame::SurfaceForDrawing(bool aDoPadding,
bool aDoPartialDecode,
bool aDoTile,
const nsIntMargin& aPadding,
gfxMatrix& aUserSpaceToImageSpace,
gfxRect& aFill,
gfxRect& aSubimage,
gfxRect& aSourceRect,
gfxRect& aImageRect)
{
gfxIntSize size(PRInt32(aImageRect.Width()), PRInt32(aImageRect.Height()));
if (!aDoPadding && !aDoPartialDecode) {
NS_ASSERTION(!mSinglePixel, "This should already have been handled");
return SurfaceWithFormat(new gfxSurfaceDrawable(ThebesSurface(), size), mFormat);
}
gfxRect available = gfxRect(mDecoded.x, mDecoded.y, mDecoded.width, mDecoded.height);
if (aDoTile || mSinglePixel) {
// Create a temporary surface.
// Give this surface an alpha channel because there are
// transparent pixels in the padding or undecoded area
gfxImageSurface::gfxImageFormat format = gfxASurface::ImageFormatARGB32;
nsRefPtr<gfxASurface> surface =
gfxPlatform::GetPlatform()->CreateOffscreenSurface(size, gfxImageSurface::ContentFromFormat(format));
if (!surface || surface->CairoStatus())
return SurfaceWithFormat();
// Fill 'available' with whatever we've got
gfxContext tmpCtx(surface);
tmpCtx.SetOperator(gfxContext::OPERATOR_SOURCE);
if (mSinglePixel) {
tmpCtx.SetDeviceColor(mSinglePixelColor);
} else {
tmpCtx.SetSource(ThebesSurface(), gfxPoint(aPadding.left, aPadding.top));
}
tmpCtx.Rectangle(available);
tmpCtx.Fill();
return SurfaceWithFormat(new gfxSurfaceDrawable(surface, size), format);
}
// Not tiling, and we have a surface, so we can account for
// padding and/or a partial decode just by twiddling parameters.
// First, update our user-space fill rect.
aSourceRect = aSourceRect.Intersect(available);
gfxMatrix imageSpaceToUserSpace = aUserSpaceToImageSpace;
imageSpaceToUserSpace.Invert();
aFill = imageSpaceToUserSpace.Transform(aSourceRect);
aSubimage = aSubimage.Intersect(available) - gfxPoint(aPadding.left, aPadding.top);
aUserSpaceToImageSpace.Multiply(gfxMatrix().Translate(-gfxPoint(aPadding.left, aPadding.top)));
aSourceRect = aSourceRect - gfxPoint(aPadding.left, aPadding.top);
aImageRect = gfxRect(0, 0, mSize.width, mSize.height);
gfxIntSize availableSize(mDecoded.width, mDecoded.height);
return SurfaceWithFormat(new gfxSurfaceDrawable(ThebesSurface(),
availableSize),
mFormat);
}
nsresult
nsThebesImage::ThebesDrawTile(gfxContext *thebesContext,
nsIDeviceContext* dx,
const gfxPoint& offset,
const gfxRect& targetRect,
const nsIntRect& aSubimageRect,
const PRInt32 xPadding,
const PRInt32 yPadding)
{
NS_ASSERTION(xPadding >= 0 && yPadding >= 0, "negative padding");
if (targetRect.size.width <= 0.0 || targetRect.size.height <= 0.0)
return NS_OK;
// don't do anything if we have a transparent pixel source
if (mSinglePixel && mSinglePixelColor.a == 0.0)
return NS_OK;
PRBool doSnap = !(thebesContext->CurrentMatrix().HasNonTranslation());
PRBool hasPadding = ((xPadding != 0) || (yPadding != 0));
gfxImageSurface::gfxImageFormat format = mFormat;
gfxPoint tmpOffset = offset;
if (mSinglePixel && !hasPadding) {
thebesContext->SetDeviceColor(mSinglePixelColor);
} else {
nsRefPtr<gfxASurface> surface;
PRInt32 width, height;
if (hasPadding) {
/* Ugh we have padding; create a temporary surface that's the size of the surface + pad area,
* and render the image into it first. Then we'll tile that surface. */
width = mWidth + xPadding;
height = mHeight + yPadding;
// Reject over-wide or over-tall images.
if (!AllowedImageSize(width, height))
return NS_ERROR_FAILURE;
format = gfxASurface::ImageFormatARGB32;
surface = gfxPlatform::GetPlatform()->CreateOffscreenSurface(
gfxIntSize(width, height), format);
if (!surface || surface->CairoStatus()) {
return NS_ERROR_OUT_OF_MEMORY;
}
gfxContext tmpContext(surface);
if (mSinglePixel) {
tmpContext.SetDeviceColor(mSinglePixelColor);
} else {
tmpContext.SetSource(ThebesSurface());
}
tmpContext.SetOperator(gfxContext::OPERATOR_SOURCE);
tmpContext.Rectangle(gfxRect(0, 0, mWidth, mHeight));
tmpContext.Fill();
} else {
width = mWidth;
height = mHeight;
surface = ThebesSurface();
}
// Scale factor to account for CSS pixels; note that the offset (and
// therefore p0) is in device pixels, while the width and height are in
// CSS pixels.
gfxFloat scale = gfxFloat(dx->AppUnitsPerDevPixel()) /
gfxFloat(nsIDeviceContext::AppUnitsPerCSSPixel());
if ((aSubimageRect.width < width || aSubimageRect.height < height) &&
(thebesContext->CurrentMatrix().HasNonTranslation() || scale != 1.0)) {
// Some of the source image should not be drawn, and we're going
// to be doing more than just translation, so we might accidentally
// sample the non-drawn pixels. Avoid that by creating a
// temporary image representing the portion that will be drawn,
// with built-in padding since we can't use EXTEND_PAD and
// EXTEND_REPEAT at the same time for different axes.
PRInt32 padX = aSubimageRect.width < width ? 1 : 0;
PRInt32 padY = aSubimageRect.height < height ? 1 : 0;
PRInt32 tileWidth = PR_MIN(aSubimageRect.width, width);
PRInt32 tileHeight = PR_MIN(aSubimageRect.height, height);
// This tmpSurface will contain a snapshot of the repeated
// tile image at (aSubimageRect.x, aSubimageRect.y,
// tileWidth, tileHeight), with padX padding added to the left
// and right sides and padY padding added to the top and bottom
// sides.
nsRefPtr<gfxASurface> tmpSurface;
tmpSurface = gfxPlatform::GetPlatform()->CreateOffscreenSurface(
gfxIntSize(tileWidth + 2*padX, tileHeight + 2*padY), format);
if (!tmpSurface || tmpSurface->CairoStatus()) {
return NS_ERROR_OUT_OF_MEMORY;
}
gfxContext tmpContext(tmpSurface);
tmpContext.SetOperator(gfxContext::OPERATOR_SOURCE);
gfxPattern pat(surface);
pat.SetExtend(gfxPattern::EXTEND_REPEAT);
// Copy the needed portion of the source image to the temporary
// surface. We also copy over horizontal and/or vertical padding
// strips one pixel wide, plus the corner pixels if necessary.
// So in the most general case the temporary surface ends up
// looking like
// P P P ... P P P
// P X X ... X X P
// P X X ... X X P
// ...............
// P X X ... X X P
// P X X ... X X P
// P P P ... P P P
// Where each P pixel has the color of its nearest source X
// pixel. We implement this as a loop over all nine possible
// areas, [padding, body, padding] x [padding, body, padding].
// Note that we will not need padding on both axes unless
// we are painting just a single tile, in which case this
// will hardly ever get called since nsCSSRendering converts
// the single-tile case to nsLayoutUtils::DrawImage. But this
// could be called on other paths (XUL trees?) and it's simpler
// and clearer to do it the general way.
PRInt32 destY = 0;
for (PRInt32 y = -1; y <= 1; ++y) {
PRInt32 stripHeight = y == 0 ? tileHeight : padY;
if (stripHeight == 0)
continue;
PRInt32 srcY = y == 1 ? aSubimageRect.YMost() - padY : aSubimageRect.y;
PRInt32 destX = 0;
for (PRInt32 x = -1; x <= 1; ++x) {
PRInt32 stripWidth = x == 0 ? tileWidth : padX;
if (stripWidth == 0)
continue;
PRInt32 srcX = x == 1 ? aSubimageRect.XMost() - padX : aSubimageRect.x;
gfxMatrix patMat;
patMat.Translate(gfxPoint(srcX - destX, srcY - destY));
pat.SetMatrix(patMat);
tmpContext.SetPattern(&pat);
tmpContext.Rectangle(gfxRect(destX, destY, stripWidth, stripHeight));
tmpContext.Fill();
tmpContext.NewPath();
destX += stripWidth;
}
destY += stripHeight;
}
// tmpOffset was the top-left of the old tile image. Make it
// the top-left of the new tile image. Note that tmpOffset is
// in destination coordinate space so we have to scale our
// CSS pixels.
tmpOffset += gfxPoint(aSubimageRect.x - padX, aSubimageRect.y - padY)/scale;
surface = tmpSurface;
}
gfxMatrix patMat;
gfxPoint p0;
p0.x = - floor(tmpOffset.x + 0.5);
p0.y = - floor(tmpOffset.y + 0.5);
patMat.Scale(scale, scale);
patMat.Translate(p0);
gfxPattern pat(surface);
pat.SetExtend(gfxPattern::EXTEND_REPEAT);
pat.SetMatrix(patMat);
#ifndef XP_MACOSX
if (scale < 1.0) {
// See bug 324698. This is a workaround. See comments
// by the earlier SetFilter call.
pat.SetFilter(0);
}
#endif
thebesContext->SetPattern(&pat);
}
gfxContext::GraphicsOperator op = thebesContext->CurrentOperator();
if (op == gfxContext::OPERATOR_OVER && format == gfxASurface::ImageFormatRGB24)
thebesContext->SetOperator(gfxContext::OPERATOR_SOURCE);
thebesContext->NewPath();
thebesContext->Rectangle(targetRect, doSnap);
thebesContext->Fill();
thebesContext->SetOperator(op);
thebesContext->SetDeviceColor(gfxRGBA(0,0,0,0));
return NS_OK;
}
/* NB: These are pixels, not twips. */
NS_IMETHODIMP
nsThebesImage::Draw(nsIRenderingContext &aContext,
const gfxRect &aSourceRect,
const gfxRect &aSubimageRect,
const gfxRect &aDestRect)
{
if (NS_UNLIKELY(aDestRect.IsEmpty())) {
NS_ERROR("nsThebesImage::Draw zero dest size - please fix caller.");
return NS_OK;
}
nsThebesRenderingContext *thebesRC = static_cast<nsThebesRenderingContext*>(&aContext);
gfxContext *ctx = thebesRC->ThebesContext();
#if 0
fprintf (stderr, "nsThebesImage::Draw src [%f %f %f %f] dest [%f %f %f %f] trans: [%f %f] dec: [%f %f]\n",
aSourceRect.pos.x, aSourceRect.pos.y, aSourceRect.size.width, aSourceRect.size.height,
aDestRect.pos.x, aDestRect.pos.y, aDestRect.size.width, aDestRect.size.height,
ctx->CurrentMatrix().GetTranslation().x, ctx->CurrentMatrix().GetTranslation().y,
mDecoded.x, mDecoded.y, mDecoded.width, mDecoded.height);
#endif
if (mSinglePixel) {
// if a == 0, it's a noop
if (mSinglePixelColor.a == 0.0)
return NS_OK;
// otherwise
gfxContext::GraphicsOperator op = ctx->CurrentOperator();
if (op == gfxContext::OPERATOR_OVER && mSinglePixelColor.a == 1.0)
ctx->SetOperator(gfxContext::OPERATOR_SOURCE);
ctx->SetDeviceColor(mSinglePixelColor);
ctx->NewPath();
ctx->Rectangle(aDestRect, PR_TRUE);
ctx->Fill();
ctx->SetOperator(op);
return NS_OK;
}
gfxFloat xscale = aDestRect.size.width / aSourceRect.size.width;
gfxFloat yscale = aDestRect.size.height / aSourceRect.size.height;
gfxRect srcRect(aSourceRect);
gfxRect subimageRect(aSubimageRect);
gfxRect destRect(aDestRect);
if (!GetIsImageComplete()) {
gfxRect decoded = gfxRect(mDecoded.x, mDecoded.y,
mDecoded.width, mDecoded.height);
srcRect = srcRect.Intersect(decoded);
subimageRect = subimageRect.Intersect(decoded);
// This happens when mDecoded.width or height is zero. bug 368427.
if (NS_UNLIKELY(srcRect.size.width == 0 || srcRect.size.height == 0))
return NS_OK;
destRect.pos.x += (srcRect.pos.x - aSourceRect.pos.x)*xscale;
destRect.pos.y += (srcRect.pos.y - aSourceRect.pos.y)*yscale;
destRect.size.width = srcRect.size.width * xscale;
destRect.size.height = srcRect.size.height * yscale;
}
// if either rectangle is empty now (possibly after the image complete check)
if (srcRect.IsEmpty() || destRect.IsEmpty())
return NS_OK;
// Reject over-wide or over-tall images.
if (!AllowedImageSize(destRect.size.width + 1, destRect.size.height + 1))
return NS_ERROR_FAILURE;
// Expand the subimageRect to place its edges on integer coordinates.
// Basically, if we're allowed to sample part of a pixel we can
// sample the whole pixel.
subimageRect.RoundOut();
nsRefPtr<gfxPattern> pat;
PRBool ctxHasNonTranslation = ctx->CurrentMatrix().HasNonTranslation();
if ((xscale == 1.0 && yscale == 1.0 && !ctxHasNonTranslation) ||
subimageRect == gfxRect(0, 0, mWidth, mHeight))
{
// No need to worry about sampling outside the subimage rectangle,
// so no need for a temporary
// XXX should we also check for situations where the source rect
// is well inside the subimage so we can't sample outside?
pat = new gfxPattern(ThebesSurface());
} else {
// Because of the RoundOut above, the subimageRect has
// integer width and height.
gfxIntSize size(PRInt32(subimageRect.Width()),
PRInt32(subimageRect.Height()));
nsRefPtr<gfxASurface> temp =
gfxPlatform::GetPlatform()->CreateOffscreenSurface(size, mFormat);
if (!temp || temp->CairoStatus() != 0)
return NS_ERROR_FAILURE;
gfxContext tempctx(temp);
tempctx.SetSource(ThebesSurface(), -subimageRect.pos);
tempctx.SetOperator(gfxContext::OPERATOR_SOURCE);
tempctx.Paint();
pat = new gfxPattern(temp);
srcRect.MoveBy(-subimageRect.pos);
}
/* See bug 364968 to understand the necessity of this goop; we basically
* have to pre-downscale any image that would fall outside of a scaled 16-bit
* coordinate space.
*/
gfxFloat deviceX, deviceY;
nsRefPtr<gfxASurface> currentTarget =
ctx->CurrentSurface(&deviceX, &deviceY);
// Quartz's matrix limits are much larger than pixman so don't use a temporary
// context there so we preserve scaled image caching
if (currentTarget->GetType() != gfxASurface::SurfaceTypeQuartz &&
(aDestRect.pos.x * (1.0 / xscale) >= 32768.0 ||
aDestRect.pos.y * (1.0 / yscale) >= 32768.0))
{
gfxIntSize dim(NS_lroundf(destRect.size.width),
NS_lroundf(destRect.size.height));
// nothing to do in this case
if (dim.width == 0 || dim.height == 0)
return NS_OK;
nsRefPtr<gfxASurface> temp =
gfxPlatform::GetPlatform()->CreateOffscreenSurface (dim, mFormat);
if (!temp || temp->CairoStatus() != 0)
return NS_ERROR_FAILURE;
gfxContext tempctx(temp);
gfxMatrix mat;
mat.Translate(srcRect.pos);
mat.Scale(1.0 / xscale, 1.0 / yscale);
pat->SetMatrix(mat);
tempctx.SetPattern(pat);
tempctx.SetOperator(gfxContext::OPERATOR_SOURCE);
tempctx.NewPath();
tempctx.Rectangle(gfxRect(0.0, 0.0, dim.width, dim.height));
tempctx.Fill();
pat = new gfxPattern(temp);
srcRect.pos.x = 0.0;
srcRect.pos.y = 0.0;
srcRect.size.width = dim.width;
srcRect.size.height = dim.height;
xscale = 1.0;
yscale = 1.0;
}
gfxMatrix mat;
mat.Translate(srcRect.pos);
mat.Scale(1.0/xscale, 1.0/yscale);
/* Translate the start point of the image (srcRect.pos)
* to coincide with the destination rectangle origin
*/
mat.Translate(-destRect.pos);
pat->SetMatrix(mat);
nsRefPtr<gfxASurface> target = ctx->CurrentSurface();
switch (target->GetType()) {
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 if we're scaling up -- 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
//
// This effectively disables smooth upscaling for images.
if (xscale > 1.0 || yscale > 1.0 || ctxHasNonTranslation)
pat->SetFilter(0);
break;
case gfxASurface::SurfaceTypeQuartz:
case gfxASurface::SurfaceTypeQuartzImage:
// Do nothing, Mac seems to be OK. Really?
break;
default:
// turn on EXTEND_PAD.
// This is what we really want for all surface types, if the
// implementation was universally good.
if (xscale != 1.0 || yscale != 1.0 || ctxHasNonTranslation)
pat->SetExtend(gfxPattern::EXTEND_PAD);
break;
}
gfxContext::GraphicsOperator op = ctx->CurrentOperator();
if (op == gfxContext::OPERATOR_OVER && mFormat == gfxASurface::ImageFormatRGB24)
ctx->SetOperator(gfxContext::OPERATOR_SOURCE);
ctx->NewPath();
ctx->SetPattern(pat);
ctx->Rectangle(destRect);
ctx->Fill();
ctx->SetOperator(op);
ctx->SetDeviceColor(gfxRGBA(0,0,0,0));
return NS_OK;
}