1/*
2 * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2013 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "GraphicsContext.h"
28
29#if USE(CG)
30#include "GraphicsContextPlatformPrivateCG.h"
31#elif USE(CAIRO)
32#include "GraphicsContextPlatformPrivateCairo.h"
33#endif
34
35#include "AffineTransform.h"
36#include "BitmapInfo.h"
37#include "TransformationMatrix.h"
38#include "NotImplemented.h"
39#include "Path.h"
40#include <wtf/MathExtras.h>
41#include <wtf/win/GDIObject.h>
42
43using namespace std;
44
45namespace WebCore {
46
47static void fillWithClearColor(HBITMAP bitmap)
48{
49    BITMAP bmpInfo;
50    GetObject(bitmap, sizeof(bmpInfo), &bmpInfo);
51    int bufferSize = bmpInfo.bmWidthBytes * bmpInfo.bmHeight;
52    memset(bmpInfo.bmBits, 0, bufferSize);
53}
54
55#if PLATFORM(WIN)
56void GraphicsContext::setShouldIncludeChildWindows(bool include)
57{
58    m_data->m_shouldIncludeChildWindows = include;
59}
60
61bool GraphicsContext::shouldIncludeChildWindows() const
62{
63    return m_data->m_shouldIncludeChildWindows;
64}
65
66GraphicsContext::WindowsBitmap::WindowsBitmap(HDC hdc, const IntSize& size)
67    : m_hdc(0)
68{
69    BitmapInfo bitmapInfo = BitmapInfo::create(size);
70
71    void* storage = 0;
72    m_bitmap = CreateDIBSection(0, &bitmapInfo, DIB_RGB_COLORS, &storage, 0, 0);
73    if (!m_bitmap)
74        return;
75
76    m_hdc = CreateCompatibleDC(hdc);
77    SelectObject(m_hdc, m_bitmap);
78
79    m_pixelData.initialize(m_bitmap);
80
81    ASSERT(storage == m_pixelData.buffer());
82
83    SetGraphicsMode(m_hdc, GM_ADVANCED);
84}
85
86GraphicsContext::WindowsBitmap::~WindowsBitmap()
87{
88    if (!m_bitmap)
89        return;
90
91    DeleteDC(m_hdc);
92    DeleteObject(m_bitmap);
93}
94
95PassOwnPtr<GraphicsContext::WindowsBitmap> GraphicsContext::createWindowsBitmap(const IntSize& size)
96{
97    return adoptPtr(new WindowsBitmap(m_data->m_hdc, size));
98}
99#endif
100
101HDC GraphicsContext::getWindowsContext(const IntRect& dstRect, bool supportAlphaBlend, bool mayCreateBitmap)
102{
103    // FIXME: Should a bitmap be created also when a shadow is set?
104    if (mayCreateBitmap && (!m_data->m_hdc || isInTransparencyLayer())) {
105        if (dstRect.isEmpty())
106            return 0;
107
108        // Create a bitmap DC in which to draw.
109        BitmapInfo bitmapInfo = BitmapInfo::create(dstRect.size());
110
111        void* pixels = 0;
112        HBITMAP bitmap = ::CreateDIBSection(NULL, &bitmapInfo, DIB_RGB_COLORS, &pixels, 0, 0);
113        if (!bitmap)
114            return 0;
115
116        auto bitmapDC = adoptGDIObject(::CreateCompatibleDC(m_data->m_hdc));
117        ::SelectObject(bitmapDC.get(), bitmap);
118
119        // Fill our buffer with clear if we're going to alpha blend.
120        if (supportAlphaBlend)
121           fillWithClearColor(bitmap);
122
123        // Make sure we can do world transforms.
124        ::SetGraphicsMode(bitmapDC.get(), GM_ADVANCED);
125
126        // Apply a translation to our context so that the drawing done will be at (0,0) of the bitmap.
127        XFORM xform = TransformationMatrix().translate(-dstRect.x(), -dstRect.y());
128
129        ::SetWorldTransform(bitmapDC.get(), &xform);
130
131        return bitmapDC.leak();
132    }
133
134    m_data->flush();
135    m_data->save();
136    return m_data->m_hdc;
137}
138
139#if PLATFORM(WIN)
140void GraphicsContextPlatformPrivate::save()
141{
142    if (!m_hdc)
143        return;
144    SaveDC(m_hdc);
145}
146
147void GraphicsContextPlatformPrivate::restore()
148{
149    if (!m_hdc)
150        return;
151    RestoreDC(m_hdc, -1);
152}
153
154void GraphicsContextPlatformPrivate::clip(const FloatRect& clipRect)
155{
156    if (!m_hdc)
157        return;
158    IntersectClipRect(m_hdc, clipRect.x(), clipRect.y(), clipRect.maxX(), clipRect.maxY());
159}
160
161void GraphicsContextPlatformPrivate::clip(const Path&)
162{
163    notImplemented();
164}
165
166void GraphicsContextPlatformPrivate::scale(const FloatSize& size)
167{
168    if (!m_hdc)
169        return;
170
171    XFORM xform = TransformationMatrix().scaleNonUniform(size.width(), size.height());
172    ModifyWorldTransform(m_hdc, &xform, MWT_LEFTMULTIPLY);
173}
174
175static const double deg2rad = 0.017453292519943295769; // pi/180
176
177void GraphicsContextPlatformPrivate::rotate(float degreesAngle)
178{
179    XFORM xform = TransformationMatrix().rotate(degreesAngle);
180    ModifyWorldTransform(m_hdc, &xform, MWT_LEFTMULTIPLY);
181}
182
183void GraphicsContextPlatformPrivate::translate(float x , float y)
184{
185    if (!m_hdc)
186        return;
187
188    XFORM xform = TransformationMatrix().translate(x, y);
189    ModifyWorldTransform(m_hdc, &xform, MWT_LEFTMULTIPLY);
190}
191
192void GraphicsContextPlatformPrivate::concatCTM(const AffineTransform& transform)
193{
194    if (!m_hdc)
195        return;
196
197    XFORM xform = transform.toTransformationMatrix();
198    ModifyWorldTransform(m_hdc, &xform, MWT_LEFTMULTIPLY);
199}
200
201void GraphicsContextPlatformPrivate::setCTM(const AffineTransform& transform)
202{
203    if (!m_hdc)
204        return;
205
206    XFORM xform = transform.toTransformationMatrix();
207    SetWorldTransform(m_hdc, &xform);
208}
209#endif
210
211}
212