1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
|
/*
* 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 "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);
}
static IntSize getExtraSpaceForWidget(RenderThemeGtk* theme)
{
// Checkboxes and scrollbar thumbs often draw outside their boundaries. Here we figure out
// the maximum amount of space we need for any type of widget and use that to increase the
// size of the scratch buffer, while preserving the final widget position.
// The checkbox extra space is calculated by looking at the widget style.
int indicatorSize, indicatorSpacing;
theme->getIndicatorMetrics(CheckboxPart, indicatorSize, indicatorSpacing);
IntSize extraSpace(indicatorSpacing, indicatorSpacing);
// Scrollbar thumbs need at least an extra pixel along their movement axis.
return extraSpace.expandedTo(IntSize(1, 1));
}
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->gdkDrawable()) {
m_paintRect = graphicsContext->getCTM().mapRect(targetRect);
m_target = graphicsContext->gdkDrawable();
return;
}
// Some widgets render outside their rectangles. We need to account for this.
m_extraSpace = getExtraSpaceForWidget(theme);
// 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_drawable_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_themeParts.colormap)->depth);
gdk_drawable_set_colormap(gScratchBuffer, theme->m_themeParts.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->gdkDrawable())
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();
}
bool WidgetRenderingContext::paintMozillaWidget(GtkThemeWidgetType type, GtkWidgetState* state, int flags, GtkTextDirection textDirection)
{
// Sometimes moz_gtk_widget_paint modifies the clipping rectangle, so we must use a copy.
GdkRectangle clipRect = m_paintRect;
m_hadError = moz_gtk_widget_paint(type, m_target, &clipRect, &m_paintRect,
state, flags, textDirection) != MOZ_GTK_SUCCESS;
return !m_hadError;
}
}
#endif // GTK_API_VERSION_2
|
