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/*
* Copyright (C) 2010 Sencha, Inc.
* Copyright (C) 2010 Igalia S.L.
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef GTK_API_VERSION_2
#include "config.h"
#include "WidgetRenderingContext.h"
#include "GraphicsContext.h"
#include "GtkVersioning.h"
#include "RefPtrCairo.h"
#include "RenderThemeGtk.h"
#include "Timer.h"
#include <gdk/gdk.h>
#include <gtk/gtk.h>
namespace WebCore {
static GdkPixmap* gScratchBuffer = 0;
static void purgeScratchBuffer()
{
if (gScratchBuffer)
g_object_unref(gScratchBuffer);
gScratchBuffer = 0;
}
// FIXME: Perhaps we can share some of this code with the ContextShadowCairo.
// Widget rendering needs a scratch image as the buffer for the intermediate
// render. Instead of creating and destroying the buffer for every operation,
// we create a buffer which will be automatically purged via a timer.
class PurgeScratchBufferTimer : public TimerBase {
private:
virtual void fired() { purgeScratchBuffer(); }
};
static PurgeScratchBufferTimer purgeScratchBufferTimer;
static void scheduleScratchBufferPurge()
{
if (purgeScratchBufferTimer.isActive())
purgeScratchBufferTimer.stop();
purgeScratchBufferTimer.startOneShot(2);
}
WidgetRenderingContext::WidgetRenderingContext(GraphicsContext* graphicsContext, const IntRect& targetRect)
: m_graphicsContext(graphicsContext)
, m_targetRect(targetRect)
, m_hadError(false)
{
RenderThemeGtk* theme = static_cast<RenderThemeGtk*>(RenderTheme::defaultTheme().get());
// Fallback: We failed to create an RGBA colormap earlier, so we cannot properly paint
// to a temporary surface and preserve transparency. To ensure decent widget rendering, just
// paint directly to the target drawable. This will not render CSS rotational transforms properly.
if (!theme->m_themePartsHaveRGBAColormap && graphicsContext->gdkWindow()) {
m_paintRect = graphicsContext->getCTM().mapRect(targetRect);
m_target = graphicsContext->gdkWindow();
return;
}
// Widgets sometimes need to draw outside their boundaries for things such as
// exterior focus. We want to allocate a some extra pixels in our surface for this.
m_extraSpace = IntSize(15, 15);
// Offset the target rectangle so that the extra space is within the boundaries of the scratch buffer.
m_paintRect = IntRect(IntPoint(m_extraSpace.width(), m_extraSpace.height()),
m_targetRect.size());
int width = m_targetRect.width() + (m_extraSpace.width() * 2);
int height = m_targetRect.height() + (m_extraSpace.height() * 2);
int scratchWidth = 0;
int scratchHeight = 0;
if (gScratchBuffer)
gdk_pixmap_get_size(gScratchBuffer, &scratchWidth, &scratchHeight);
// We do not need to recreate the buffer if the current buffer is large enough.
if (!gScratchBuffer || scratchWidth < width || scratchHeight < height) {
purgeScratchBuffer();
// Round to the nearest 32 pixels so we do not grow the buffer for similar sized requests.
width = (1 + (width >> 5)) << 5;
height = (1 + (height >> 5)) << 5;
gScratchBuffer = gdk_pixmap_new(0, width, height, gdk_colormap_get_visual(theme->m_colormap)->depth);
gdk_drawable_set_colormap(gScratchBuffer, theme->m_colormap);
}
m_target = gScratchBuffer;
// Clear the scratch buffer.
RefPtr<cairo_t> scratchBufferContext = adoptRef(gdk_cairo_create(gScratchBuffer));
cairo_set_operator(scratchBufferContext.get(), CAIRO_OPERATOR_CLEAR);
cairo_paint(scratchBufferContext.get());
}
WidgetRenderingContext::~WidgetRenderingContext()
{
// We do not need to blit back to the target in the fallback case. See above.
RenderThemeGtk* theme = static_cast<RenderThemeGtk*>(RenderTheme::defaultTheme().get());
if (!theme->m_themePartsHaveRGBAColormap && m_graphicsContext->gdkWindow())
return;
// Don't paint the results back if there was an error.
if (m_hadError) {
scheduleScratchBufferPurge();
return;
}
// FIXME: It's unclear if it is necessary to preserve the current source here.
cairo_t* cairoContext = m_graphicsContext->platformContext();
RefPtr<cairo_pattern_t> previousSource(cairo_get_source(cairoContext));
// The blit rectangle is the original target rectangle adjusted for any extra space.
IntRect fullTargetRect(m_targetRect);
fullTargetRect.inflateX(m_extraSpace.width());
fullTargetRect.inflateY(m_extraSpace.height());
gdk_cairo_set_source_pixmap(cairoContext, gScratchBuffer, fullTargetRect.x(), fullTargetRect.y());
cairo_rectangle(cairoContext, fullTargetRect.x(), fullTargetRect.y(), fullTargetRect.width(), fullTargetRect.height());
cairo_fill(cairoContext);
cairo_set_source(cairoContext, previousSource.get());
scheduleScratchBufferPurge();
}
void WidgetRenderingContext::gtkPaintBox(const IntRect& rect, GtkWidget* widget, GtkStateType stateType, GtkShadowType shadowType, const gchar* detail)
{
GdkRectangle paintRect = { m_paintRect.x + rect.x(), m_paintRect.y + rect.y(), rect.width(), rect.height() };
// Some widgets also need their allocation adjusted to account for extra space.
// Right now only scrollbar buttons have significant allocations.
GtkAllocation allocation;
gtk_widget_get_allocation(widget, &allocation);
allocation.x += m_paintRect.x;
allocation.y += m_paintRect.y;
gtk_widget_set_allocation(widget, &allocation);
gtk_paint_box(gtk_widget_get_style(widget), m_target, stateType, shadowType, &paintRect,
widget, detail, paintRect.x, paintRect.y, paintRect.width, paintRect.height);
}
void WidgetRenderingContext::gtkPaintFlatBox(const IntRect& rect, GtkWidget* widget, GtkStateType stateType, GtkShadowType shadowType, const gchar* detail)
{
GdkRectangle paintRect = { m_paintRect.x + rect.x(), m_paintRect.y + rect.y(), rect.width(), rect.height() };
gtk_paint_flat_box(gtk_widget_get_style(widget), m_target, stateType, shadowType, &paintRect,
widget, detail, paintRect.x, paintRect.y, paintRect.width, paintRect.height);
}
void WidgetRenderingContext::gtkPaintFocus(const IntRect& rect, GtkWidget* widget, GtkStateType stateType, const gchar* detail)
{
GdkRectangle paintRect = { m_paintRect.x + rect.x(), m_paintRect.y + rect.y(), rect.width(), rect.height() };
gtk_paint_focus(gtk_widget_get_style(widget), m_target, stateType, &paintRect, widget,
detail, paintRect.x, paintRect.y, paintRect.width, paintRect.height);
}
void WidgetRenderingContext::gtkPaintSlider(const IntRect& rect, GtkWidget* widget, GtkStateType stateType, GtkShadowType shadowType, const gchar* detail, GtkOrientation orientation)
{
GdkRectangle paintRect = { m_paintRect.x + rect.x(), m_paintRect.y + rect.y(), rect.width(), rect.height() };
gtk_paint_slider(gtk_widget_get_style(widget), m_target, stateType, shadowType, &m_paintRect, widget,
detail, paintRect.x, paintRect.y, paintRect.width, paintRect.height, orientation);
}
void WidgetRenderingContext::gtkPaintCheck(const IntRect& rect, GtkWidget* widget, GtkStateType stateType, GtkShadowType shadowType, const gchar* detail)
{
GdkRectangle paintRect = { m_paintRect.x + rect.x(), m_paintRect.y + rect.y(), rect.width(), rect.height() };
gtk_paint_check(gtk_widget_get_style(widget), m_target, stateType, shadowType, &paintRect, widget,
detail, paintRect.x, paintRect.y, paintRect.width, paintRect.height);
}
void WidgetRenderingContext::gtkPaintOption(const IntRect& rect, GtkWidget* widget, GtkStateType stateType, GtkShadowType shadowType, const gchar* detail)
{
GdkRectangle paintRect = { m_paintRect.x + rect.x(), m_paintRect.y + rect.y(), rect.width(), rect.height() };
gtk_paint_option(gtk_widget_get_style(widget), m_target, stateType, shadowType, &paintRect, widget,
detail, paintRect.x, paintRect.y, paintRect.width, paintRect.height);
}
void WidgetRenderingContext::gtkPaintShadow(const IntRect& rect, GtkWidget* widget, GtkStateType stateType, GtkShadowType shadowType, const gchar* detail)
{
GdkRectangle paintRect = { m_paintRect.x + rect.x(), m_paintRect.y + rect.y(), rect.width(), rect.height() };
gtk_paint_shadow(gtk_widget_get_style(widget), m_target, stateType, shadowType, &paintRect, widget,
detail, paintRect.x, paintRect.y, paintRect.width, paintRect.height);
}
void WidgetRenderingContext::gtkPaintArrow(const IntRect& rect, GtkWidget* widget, GtkStateType stateType, GtkShadowType shadowType, int arrowDirection, const gchar* detail)
{
GdkRectangle paintRect = { m_paintRect.x + rect.x(), m_paintRect.y + rect.y(), rect.width(), rect.height() };
gtk_paint_arrow(gtk_widget_get_style(widget), m_target, stateType, shadowType, &paintRect, widget, detail,
static_cast<GtkArrowType>(arrowDirection), TRUE, paintRect.x, paintRect.y, paintRect.width, paintRect.height);
}
void WidgetRenderingContext::gtkPaintVLine(const IntRect& rect, GtkWidget* widget, GtkStateType stateType, const gchar* detail)
{
GdkRectangle paintRect = { m_paintRect.x + rect.x(), m_paintRect.y + rect.y(), rect.width(), rect.height() };
gtk_paint_vline(gtk_widget_get_style(widget), m_target, stateType, &paintRect, widget, detail,
paintRect.y, paintRect.y + paintRect.height, paintRect.x);
}
}
#endif // GTK_API_VERSION_2
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