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b=576143 copy and draw over background to avoid alpha extraction when possible r=roc

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--HG--
extra : rebase_source : 810293a95d07bc0f0a981466a596ccd0db8d389b
This commit is contained in:
Karl Tomlinson 2010-07-23 10:39:22 +12:00
parent 1094a22411
commit daf62b7225
1 changed files with 252 additions and 91 deletions
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343
gfx/thebes/gfxXlibNativeRenderer.cpp
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@ -40,6 +40,7 @@
#include "gfxXlibNativeRenderer.h"
#include "gfxXlibSurface.h"
#include "gfxImageSurface.h"
#include "gfxContext.h"
#include "cairo-xlib.h"
#include "cairo-xlib-xrender.h"
@ -60,18 +61,38 @@
#define NATIVE_DRAWING_NOTE(m) do {} while (0)
#endif
/* We have three basic strategies available:
1) 'direct': cr targets an xlib surface, and other conditions are met: we can
pass the underlying drawable directly to the callback
2) 'opaque': the image is opaque: we can create a temporary cairo xlib surface,
pass its underlying drawable to the callback, and paint the result
using cairo
3) 'default': create a temporary cairo xlib surface, fill with black, pass its
underlying drawable to the callback, copy the results to a cairo
image surface, repeat with a white background, update the on-black
/* We have four basic strategies available:
1) 'direct': If the target is an xlib surface, and other conditions are met,
we can pass the underlying drawable directly to the callback.
2) 'simple': If the drawing is opaque, or we can draw to a surface with an
alpha channel, then we can create a temporary xlib surface, pass its
underlying drawable to the callback, and composite the result using
cairo.
3) 'copy-background': If the drawing is not opaque but the target is
opaque, and we can draw to a surface with format such that pixel
conversion to and from the target format is exact, we can create a
temporary xlib surface, copy the background from the target, pass the
underlying drawable to the callback, and copy back to the target.
This strategy is not used if the pixel format conversion is not exact,
because that would mean that drawing intended to be very transparent
messes with other content.
The strategy is prefered over simple for non-opaque drawing and opaque
targets on the same screen as compositing without alpha is a simpler
operation.
4) 'alpha-extraction': create a temporary xlib surface, fill with black,
pass its underlying drawable to the callback, copy the results to a
cairo image surface, repeat with a white background, update the on-black
image alpha values by comparing the two images, then paint the on-black
image using cairo
Sure would be nice to have an X extension to do 3 for us on the server...
image using cairo.
Sure would be nice to have an X extension or GL to do this for us on the
server...
*/
static cairo_bool_t
@ -97,7 +118,7 @@ _get_rectangular_clip (cairo_t *cr,
cliplist = cairo_copy_clip_rectangle_list (cr);
if (cliplist->status != CAIRO_STATUS_SUCCESS) {
retval = PR_FALSE;
NATIVE_DRAWING_NOTE("TAKING SLOW PATH: non-rectangular clip\n");
NATIVE_DRAWING_NOTE("FALLBACK: non-rectangular clip");
goto FINISH;
}
@ -113,7 +134,7 @@ _get_rectangular_clip (cairo_t *cr,
!_convert_coord_to_int (clips[i].height, &rect.height))
{
retval = PR_FALSE;
NATIVE_DRAWING_NOTE("TAKING SLOW PATH: non-integer clip\n");
NATIVE_DRAWING_NOTE("FALLBACK: non-integer clip");
goto FINISH;
}
@ -128,7 +149,7 @@ _get_rectangular_clip (cairo_t *cr,
if (i >= max_rectangles) {
retval = PR_FALSE;
NATIVE_DRAWING_NOTE("TAKING SLOW PATH: unsupported clip rectangle count\n");
NATIVE_DRAWING_NOTE("FALLBACK: unsupported clip rectangle count");
goto FINISH;
}
@ -157,16 +178,10 @@ gfxXlibNativeRenderer::DrawDirect(gfxContext *ctx, nsIntSize size,
{
cairo_t *cr = ctx->GetCairo();
/* Check that the operator is OVER */
if (cairo_get_operator (cr) != CAIRO_OPERATOR_OVER) {
NATIVE_DRAWING_NOTE("TAKING SLOW PATH: non-OVER operator\n");
return PR_FALSE;
}
/* Check that the target surface is an xlib surface. */
cairo_surface_t *target = cairo_get_group_target (cr);
if (cairo_surface_get_type (target) != CAIRO_SURFACE_TYPE_XLIB) {
NATIVE_DRAWING_NOTE("TAKING SLOW PATH: non-X surface\n");
NATIVE_DRAWING_NOTE("FALLBACK: non-X surface");
return PR_FALSE;
}
@ -175,18 +190,18 @@ gfxXlibNativeRenderer::DrawDirect(gfxContext *ctx, nsIntSize size,
then alternate screens cannot be supported. */
PRBool supports_alternate_visual =
(flags & DRAW_SUPPORTS_ALTERNATE_VISUAL) != 0;
PRBool supports_alternate_screen = supports_alternate_visual
&& (flags & DRAW_SUPPORTS_ALTERNATE_SCREEN);
PRBool supports_alternate_screen = supports_alternate_visual &&
(flags & DRAW_SUPPORTS_ALTERNATE_SCREEN);
if (!supports_alternate_screen &&
cairo_xlib_surface_get_screen (target) != screen) {
NATIVE_DRAWING_NOTE("TAKING SLOW PATH: non-default screen\n");
NATIVE_DRAWING_NOTE("FALLBACK: non-default screen");
return PR_FALSE;
}
/* Check that there is a visual */
Visual *target_visual = cairo_xlib_surface_get_visual (target);
if (!target_visual) {
NATIVE_DRAWING_NOTE("TAKING SLOW PATH: no Visual for surface\n");
NATIVE_DRAWING_NOTE("FALLBACK: no Visual for surface");
return PR_FALSE;
}
/* Check that the visual is supported */
@ -198,7 +213,7 @@ gfxXlibNativeRenderer::DrawDirect(gfxContext *ctx, nsIntSize size,
if (!target_format ||
(target_format !=
XRenderFindVisualFormat (DisplayOfScreen(screen), visual))) {
NATIVE_DRAWING_NOTE("TAKING SLOW PATH: unsupported Visual\n");
NATIVE_DRAWING_NOTE("FALLBACK: unsupported Visual");
return PR_FALSE;
}
}
@ -269,57 +284,174 @@ gfxXlibNativeRenderer::DrawDirect(gfxContext *ctx, nsIntSize size,
}
static PRBool
FormatHasAlpha(const XRenderPictFormat *format) {
if (!format)
return false;
if (format->type != PictTypeDirect)
return false;
return format->direct.alphaMask != 0;
VisualHasAlpha(Screen *screen, Visual *visual) {
// There may be some other visuals format with alpha but usually this is
// the only one we care about.
return visual->c_class == TrueColor &&
visual->bits_per_rgb == 8 &&
visual->red_mask == 0xff0000 &&
visual->green_mask == 0xff00 &&
visual->blue_mask == 0xff &&
gfxXlibSurface::DepthOfVisual(screen, visual) == 32;
}
// Returns whether pixel conversion between visual and format is exact (in
// both directions).
static PRBool
FormatConversionIsExact(Screen *screen, Visual *visual, XRenderPictFormat *format) {
if (!format ||
visual->c_class != TrueColor ||
format->type != PictTypeDirect ||
gfxXlibSurface::DepthOfVisual(screen, visual) != format->depth)
return PR_FALSE;
XRenderPictFormat *visualFormat =
XRenderFindVisualFormat(DisplayOfScreen(screen), visual);
if (visualFormat->type != PictTypeDirect )
return PR_FALSE;
const XRenderDirectFormat& a = visualFormat->direct;
const XRenderDirectFormat& b = format->direct;
return a.redMask == b.redMask &&
a.greenMask == b.greenMask &&
a.blueMask == b.blueMask;
}
// The 3 non-direct strategies described above.
// The surface format and strategy are inter-dependent.
enum DrawingMethod {
eSimple,
eCopyBackground,
eAlphaExtraction
};
static already_AddRefed<gfxXlibSurface>
_create_temp_xlib_surface (cairo_t *cr, nsIntSize size,
PRUint32 flags, Screen *screen, Visual *visual)
CreateTempXlibSurface (gfxASurface *destination, nsIntSize size,
PRBool canDrawOverBackground,
PRUint32 flags, Screen *screen, Visual *visual,
DrawingMethod *method)
{
Drawable drawable = None;
PRBool drawIsOpaque = (flags & gfxXlibNativeRenderer::DRAW_IS_OPAQUE) != 0;
PRBool supportsAlternateVisual =
(flags & gfxXlibNativeRenderer::DRAW_SUPPORTS_ALTERNATE_VISUAL) != 0;
PRBool supportsAlternateScreen = supportsAlternateVisual &&
(flags & gfxXlibNativeRenderer::DRAW_SUPPORTS_ALTERNATE_SCREEN);
// For opaque drawing, set up the temp surface for copying to the target.
// For non-opaque drawing we read back anyway so just use the
// prefered screen and visual.
cairo_surface_t *target = cairo_get_group_target (cr);
if ((flags & gfxXlibNativeRenderer::DRAW_IS_OPAQUE)
&& cairo_surface_get_type (target) == CAIRO_SURFACE_TYPE_XLIB) {
cairo_surface_t *target = destination->CairoSurface();
cairo_surface_type_t target_type = cairo_surface_get_type (target);
cairo_content_t target_content = cairo_surface_get_content (target);
Screen *target_screen = cairo_xlib_surface_get_screen (target);
PRBool supports_alternate_visual =
(flags & gfxXlibNativeRenderer::DRAW_SUPPORTS_ALTERNATE_VISUAL) != 0;
PRBool supports_alternate_screen = supports_alternate_visual
&& (flags & gfxXlibNativeRenderer::DRAW_SUPPORTS_ALTERNATE_SCREEN);
if (target_screen == screen || supports_alternate_screen) {
Screen *target_screen = target_type == CAIRO_SURFACE_TYPE_XLIB ?
cairo_xlib_surface_get_screen (target) : screen;
if (supports_alternate_visual) {
Visual *target_visual = cairo_xlib_surface_get_visual (target);
if (target_visual &&
(!FormatHasAlpha(cairo_xlib_surface_get_xrender_format (target)))) {
visual = target_visual;
} else if (target_screen != screen) {
visual = DefaultVisualOfScreen (target_screen);
}
// When the background has an alpha channel, we need to draw with an alpha
// channel anyway, so there is no need to copy the background. If
// doCopyBackground is set here, we'll also need to check below that the
// background can copied without any loss in format conversions.
PRBool doCopyBackground = !drawIsOpaque && canDrawOverBackground &&
target_content == CAIRO_CONTENT_COLOR;
if (supportsAlternateScreen && screen != target_screen && drawIsOpaque) {
// Prefer a visual on the target screen.
// (If !drawIsOpaque, we'll need doCopyBackground or an alpha channel.)
visual = DefaultVisualOfScreen(target_screen);
screen = target_screen;
} else if (doCopyBackground || (supportsAlternateVisual && drawIsOpaque)) {
// Analyse the pixel formats either to check whether we can
// doCopyBackground or to see if we can find a better visual for
// opaque drawing.
Visual *target_visual = NULL;
XRenderPictFormat *target_format = NULL;
switch (target_type) {
case CAIRO_SURFACE_TYPE_XLIB:
target_visual = cairo_xlib_surface_get_visual (target);
target_format = cairo_xlib_surface_get_xrender_format (target);
break;
case CAIRO_SURFACE_TYPE_IMAGE: {
gfxASurface::gfxImageFormat imageFormat =
static_cast<gfxImageSurface*>(destination)->Format();
target_visual = gfxXlibSurface::FindVisual(screen, imageFormat);
Display *dpy = DisplayOfScreen(screen);
if (target_visual) {
target_format = XRenderFindVisualFormat(dpy, visual);
} else {
target_format =
gfxXlibSurface::FindRenderFormat(dpy, imageFormat);
}
break;
}
default:
break;
}
if (supportsAlternateVisual &&
(supportsAlternateScreen || screen == target_screen)) {
if (target_visual) {
visual = target_visual;
screen = target_screen;
}
}
// Could try harder to match formats across screens for background
// copying when !supportsAlternateScreen, if we cared. Preferably
// we'll find a visual below with an alpha channel anyway; if so, the
// background won't need to be copied.
drawable = cairo_xlib_surface_get_drawable (target);
screen = target_screen;
if (doCopyBackground && visual != target_visual &&
!FormatConversionIsExact(screen, visual, target_format)) {
doCopyBackground = PR_FALSE;
}
}
if (!drawable) {
drawable = RootWindowOfScreen (screen);
if (supportsAlternateVisual && !drawIsOpaque &&
(screen != target_screen ||
!(doCopyBackground || VisualHasAlpha(screen, visual)))) {
// Try to find a visual with an alpha channel.
Screen *visualScreen =
supportsAlternateScreen ? target_screen : screen;
Visual *argbVisual =
gfxXlibSurface::FindVisual(visualScreen,
gfxASurface::ImageFormatARGB32);
if (argbVisual) {
visual = argbVisual;
screen = visualScreen;
} else if (!doCopyBackground &&
gfxXlibSurface::DepthOfVisual(screen, visual) != 24) {
// Will need to do alpha extraction; prefer a 24-bit visual.
// No advantage in using the target screen.
Visual *rgb24Visual =
gfxXlibSurface::FindVisual(screen,
gfxASurface::ImageFormatRGB24);
if (rgb24Visual) {
visual = rgb24Visual;
}
}
}
return gfxXlibSurface::Create(screen, visual,
gfxIntSize(size.width, size.height),
drawable);
Drawable drawable =
(screen == target_screen && target_type == CAIRO_SURFACE_TYPE_XLIB) ?
cairo_xlib_surface_get_drawable (target) : RootWindowOfScreen(screen);
nsRefPtr<gfxXlibSurface> surface =
gfxXlibSurface::Create(screen, visual,
gfxIntSize(size.width, size.height),
drawable);
if (drawIsOpaque ||
surface->GetContentType() == gfxASurface::CONTENT_COLOR_ALPHA) {
NATIVE_DRAWING_NOTE(drawIsOpaque ?
", SIMPLE OPAQUE\n" : ", SIMPLE WITH ALPHA");
*method = eSimple;
} else if (doCopyBackground) {
NATIVE_DRAWING_NOTE(", COPY BACKGROUND\n");
*method = eCopyBackground;
} else {
NATIVE_DRAWING_NOTE(", SLOW ALPHA EXTRACTION\n");
*method = eAlphaExtraction;
}
return surface.forget();
}
PRBool
@ -456,9 +588,17 @@ gfxXlibNativeRenderer::Draw(gfxContext* ctx, nsIntSize size,
result->mUniformAlpha = PR_FALSE;
result->mUniformColor = PR_FALSE;
}
PRBool matrixIsIntegerTranslation =
!ctx->CurrentMatrix().HasNonIntegerTranslation();
PRBool drawIsOpaque = (flags & DRAW_IS_OPAQUE) != 0;
gfxMatrix matrix = ctx->CurrentMatrix();
// We can only draw direct or onto a copied background if pixels align and
// native drawing is compatible with the current operator. (The matrix is
// actually also pixel-exact for flips and right-angle rotations, which
// would permit copying the background but not drawing direct.)
PRBool matrixIsIntegerTranslation = !matrix.HasNonIntegerTranslation();
PRBool canDrawOverBackground = matrixIsIntegerTranslation &&
ctx->CurrentOperator() == gfxContext::OPERATOR_OVER;
// The padding of 0.5 for non-pixel-exact transformations used here is
// the same as what _cairo_pattern_analyze_filter uses.
@ -469,8 +609,11 @@ gfxXlibNativeRenderer::Draw(gfxContext* ctx, nsIntSize size,
// little larger than the drawingRect;
affectedRect.Outset(filterRadius);
NATIVE_DRAWING_NOTE("TAKING SLOW PATH: matrix not integer translation\n");
NATIVE_DRAWING_NOTE("FALLBACK: matrix not integer translation");
} else if (!canDrawOverBackground) {
NATIVE_DRAWING_NOTE("FALLBACK: unsupported operator");
}
// Clipping to the region affected by drawing allows us to consider only
// the portions of the clip region that will be affected by drawing.
gfxRect clipExtents;
@ -482,42 +625,59 @@ gfxXlibNativeRenderer::Draw(gfxContext* ctx, nsIntSize size,
if (clipExtents.IsEmpty())
return; // nothing to do
if (matrixIsIntegerTranslation &&
if (canDrawOverBackground &&
DrawDirect(ctx, size, flags, screen, visual))
return;
}
nsIntRect drawingRect(nsIntPoint(0, 0), size);
PRBool drawIsOpaque = (flags & DRAW_IS_OPAQUE) != 0;
if (drawIsOpaque || !result) {
// Drawing need only be performed within the clip extents
// (and padding for the filter).
if (!matrixIsIntegerTranslation) {
// The source surface may need to be a little larger than the clip
// extents due to the filter footprint.
clipExtents.Outset(filterRadius);
}
clipExtents.RoundOut();
nsIntRect intExtents(PRInt32(clipExtents.X()),
PRInt32(clipExtents.Y()),
PRInt32(clipExtents.Width()),
PRInt32(clipExtents.Height()));
drawingRect.IntersectRect(drawingRect, intExtents);
// Drawing need only be performed within the clip extents
// (and padding for the filter).
if (!matrixIsIntegerTranslation) {
// The source surface may need to be a little larger than the clip
// extents due to the filter footprint.
clipExtents.Outset(filterRadius);
}
clipExtents.RoundOut();
nsIntRect intExtents(PRInt32(clipExtents.X()),
PRInt32(clipExtents.Y()),
PRInt32(clipExtents.Width()),
PRInt32(clipExtents.Height()));
drawingRect.IntersectRect(drawingRect, intExtents);
gfxPoint offset(drawingRect.x, drawingRect.y);
cairo_t *cr = ctx->GetCairo();
DrawingMethod method;
nsRefPtr<gfxASurface> target = ctx->CurrentSurface();
nsRefPtr<gfxXlibSurface> tempXlibSurface =
_create_temp_xlib_surface (cr, drawingRect.Size(),
flags, screen, visual);
if (tempXlibSurface == NULL)
CreateTempXlibSurface(target, drawingRect.Size(),
canDrawOverBackground, flags, screen, visual,
&method);
if (!tempXlibSurface)
return;
if (drawingRect.Size() != size || method == eCopyBackground) {
// Only drawing a portion, or copying background,
// so won't return a result.
result = NULL;
}
nsRefPtr<gfxContext> tmpCtx;
if (!drawIsOpaque) {
tmpCtx = new gfxContext(tempXlibSurface);
tmpCtx->SetOperator(gfxContext::OPERATOR_CLEAR);
if (method == eCopyBackground) {
tmpCtx->SetOperator(gfxContext::OPERATOR_SOURCE);
tmpCtx->SetSource(target, -(offset + matrix.GetTranslation()));
// The copy from the tempXlibSurface to the target context should
// use operator SOURCE, but that would need a mask to bound the
// operation. Here we only copy opaque backgrounds so operator
// OVER will behave like SOURCE masked by the surface.
NS_ASSERTION(tempXlibSurface->GetContentType()
== gfxASurface::CONTENT_COLOR,
"Don't copy background with a transparent surface");
} else {
tmpCtx->SetOperator(gfxContext::OPERATOR_CLEAR);
}
tmpCtx->Paint();
}
@ -525,7 +685,7 @@ gfxXlibNativeRenderer::Draw(gfxContext* ctx, nsIntSize size,
return;
}
if (drawIsOpaque) {
if (method != eAlphaExtraction) {
ctx->SetSource(tempXlibSurface, offset);
ctx->Paint();
if (result) {
@ -561,6 +721,7 @@ gfxXlibNativeRenderer::Draw(gfxContext* ctx, nsIntSize size,
_compute_alpha_values ((uint32_t*)black_data, (uint32_t*)white_data, width, height, result);
cairo_surface_mark_dirty (black_image_surface);
cairo_t *cr = ctx->GetCairo();
cairo_set_source_surface (cr, black_image_surface, offset.x, offset.y);
/* if the caller wants to retrieve the rendered image, put it into
a 'similar' surface, and use that as the source for the drawing right