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
|
/*
* Copyright (C) 2007 Alp Toker <alp@atoker.com>
* Copyright (C) 2007 Apple Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "PrintContext.h"
#include "GraphicsContext.h"
#include "Frame.h"
#include "RenderView.h"
using namespace WebCore;
namespace WebCore {
PrintContext::PrintContext(Frame* frame)
: m_frame(frame)
{
}
PrintContext::~PrintContext()
{
m_pageRects.clear();
}
int PrintContext::pageCount() const
{
return m_pageRects.size();
}
void PrintContext::computePageRects(const FloatRect& printRect, float headerHeight, float footerHeight, float userScaleFactor, float& outPageHeight)
{
m_pageRects.clear();
outPageHeight = 0;
if (!m_frame->document() || !m_frame->view() || !m_frame->document()->renderer())
return;
RenderView* root = static_cast<RenderView*>(m_frame->document()->renderer());
if (!root) {
LOG_ERROR("document to be printed has no renderer");
return;
}
if (userScaleFactor <= 0) {
LOG_ERROR("userScaleFactor has bad value %.2f", userScaleFactor);
return;
}
float ratio = printRect.height() / printRect.width();
float pageWidth = (float)root->docWidth();
float pageHeight = pageWidth * ratio;
outPageHeight = pageHeight; // this is the height of the page adjusted by margins
pageHeight -= headerHeight + footerHeight;
if (pageHeight <= 0) {
LOG_ERROR("pageHeight has bad value %.2f", pageHeight);
return;
}
float currPageHeight = pageHeight / userScaleFactor;
float docHeight = root->layer()->height();
float currPageWidth = pageWidth / userScaleFactor;
// always return at least one page, since empty files should print a blank page
float printedPagesHeight = 0.0;
do {
float proposedBottom = std::min(docHeight, printedPagesHeight + pageHeight);
m_frame->adjustPageHeight(&proposedBottom, printedPagesHeight, proposedBottom, printedPagesHeight);
currPageHeight = max(1.0f, proposedBottom - printedPagesHeight);
m_pageRects.append(IntRect(0, (int)printedPagesHeight, (int)currPageWidth, (int)currPageHeight));
printedPagesHeight += currPageHeight;
} while (printedPagesHeight < docHeight);
}
void PrintContext::begin(float width)
{
// By imaging to a width a little wider than the available pixels,
// thin pages will be scaled down a little, matching the way they
// print in IE and Camino. This lets them use fewer sheets than they
// would otherwise, which is presumably why other browsers do this.
// Wide pages will be scaled down more than this.
const float PrintingMinimumShrinkFactor = 1.25f;
// This number determines how small we are willing to reduce the page content
// in order to accommodate the widest line. If the page would have to be
// reduced smaller to make the widest line fit, we just clip instead (this
// behavior matches MacIE and Mozilla, at least)
const float PrintingMaximumShrinkFactor = 2.0f;
float minLayoutWidth = width * PrintingMinimumShrinkFactor;
float maxLayoutWidth = width * PrintingMaximumShrinkFactor;
// FIXME: This will modify the rendering of the on-screen frame.
// Could lead to flicker during printing.
m_frame->setPrinting(true, minLayoutWidth, maxLayoutWidth, true);
}
void PrintContext::spoolPage(GraphicsContext& ctx, int pageNumber, float width)
{
IntRect pageRect = m_pageRects[pageNumber];
float scale = width / pageRect.width();
ctx.save();
ctx.scale(FloatSize(scale, scale));
ctx.translate(-pageRect.x(), -pageRect.y());
ctx.clip(pageRect);
m_frame->paint(&ctx, pageRect);
ctx.restore();
}
void PrintContext::end()
{
m_frame->setPrinting(false, 0, 0, true);
}
}
|
