On 25 April 2013 03:37, Jianhua Shao <alex....@gmail.com> wrote:
> On Thu, Apr 25, 2013 at 5:32 AM, Emmanuel Rodriguez <
> emmanuel.rodrig...@gmail.com> wrote:
>
>>
>>
>> Thanks for sharing your experience.
>>
> The version 1.6.3 does not meet my requirements.
> "enable-accelerated-compositing" is what I need in the newer version, from
> the dev document I found it is available from version 1.7.5.
> Seems I can give a try on version 1.7.x.
>
I just ment to try it and see if the transparencies where still enabled in
1.6.3
>
> And have you read my another mail,
>
> cairo_surface_t* surface = webkit_web_view_get_snapshot(view);
> cairo_surface_write_to_png(surface, "/home/meego/dump.png");
>
> will result a transparent png file...
> Maybe I need to do some configuration on cario/gtk, but I am new on this
> subject, anyone can give me some hint?
>
By the looks of the code of 1.6.3 and 1.10.2 it seems that
webkit_web_view_get_snapshot() behaves like the old webkit_web_view_draw().
In 1.6.3 the draw operation is done with:
static void paintWebView(Frame* frame, gboolean transparent,
GraphicsContext& context, const IntRect& clipRect, const Vector<IntRect>&
rects)
{
bool coalesce = true;
if (rects.size() > 0)
coalesce = shouldCoalesce(clipRect, rects);
if (coalesce) {
context.clip(clipRect);
if (transparent)
context.clearRect(clipRect);
frame->view()->paint(&context, clipRect);
} else {
for (size_t i = 0; i < rects.size(); i++) {
IntRect rect = rects[i];
context.save();
context.clip(rect);
if (transparent)
context.clearRect(rect);
frame->view()->paint(&context, rect);
context.restore();
}
}
context.save();
context.clip(clipRect);
frame->page()->inspectorController()->drawHighlight(context);
context.restore();
}
In 1.10.2 webkit_web_view_get_snapshot is done with:
cairo_surface_t*
webkit_web_view_get_snapshot(WebKitWebView* webView)
{
g_return_val_if_fail(WEBKIT_IS_WEB_VIEW(webView), 0);
Frame* frame = core(webView)->mainFrame();
if (!frame || !frame->contentRenderer() || !frame->view())
return 0;
frame->view()->updateLayoutAndStyleIfNeededRecursive();
GtkAllocation allocation;
gtk_widget_get_allocation(GTK_WIDGET(webView), &allocation);
cairo_surface_t* surface =
cairo_image_surface_create(CAIRO_FORMAT_ARGB32, allocation.width,
allocation.height);
RefPtr<cairo_t> cr = adoptRef(cairo_create(surface));
GraphicsContext gc(cr.get());
IntRect rect = allocation;
gc.applyDeviceScaleFactor(frame->page()->deviceScaleFactor());
gc.save();
gc.clip(rect);
if (webView->priv->transparent)
gc.clearRect(rect);
frame->view()->paint(&gc, rect);
gc.restore();
return surface;
}
Both functions have the same drawing logic:
context.clip(clipRect);
if (transparent)
context.clearRect(clipRect);
frame->view()->paint(&context, clipRect);
context.restore();
Wit the exception that webkit_web_view_get_snapshot() forces the drawing
into an image surface except of accepting a cairo context.
--
Emmanuel Rodriguez
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