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
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
|
#include "_globals.h"
#include "canvas.h"
void Canvas::updateTrans(BYTE* pData)
{
// MEMO: this follwing transparency code only makes sense for m_nChannels == 4
assert(m_nChannels == 4);
// apply transparency, if any
if (m_bTransColor)
{
for (int y = 0; y < m_nHeight; ++y)
{
COLORREF* pValue = reinterpret_cast<COLORREF*>(pData + y * m_nLineLength);
for (int x = 0; x < m_nWidth; ++x)
{
*pValue = (*pValue & 0x00FFFFFF) | ((*pValue & 0x00FFFFFF) == m_TransColor ? 0x00000000 : 0xFF000000);
++pValue;
}
}
}
else
{
for (int y = 0; y < m_nHeight; ++y)
{
COLORREF* pValue = reinterpret_cast<COLORREF*>(pData + y * m_nLineLength);
for (int x = 0; x < m_nWidth; ++x)
{
*pValue |= 0xFF000000;
++pValue;
}
}
}
}
Canvas::Canvas(int nWidth, int nHeight)
: m_nChannels(4)
, m_nWidth(nWidth)
, m_nHeight(nHeight)
, m_nLineLength((m_nChannels * m_nWidth + 3) & ~0x3)
, m_bTransColor(false)
, m_TransColor(0)
, m_pBMIH(NULL)
{
}
Canvas::~Canvas()
{
if (m_hOldBmp)
{
SelectObject(m_hDC, m_hOldBmp);
}
if (m_hBmp)
{
DeleteObject(m_hBmp);
}
if (m_hDC)
{
DeleteDC(m_hDC);
}
delete m_pBMIH;
}
void Canvas::setTrans(COLORREF transColor, bool bFill /* = false */)
{
m_bTransColor = true;
m_TransColor = transColor;
if (bFill)
{
fillBackground(transColor);
}
}
void Canvas::fillBackground(COLORREF bkColor)
{
HDC hDC = beginDraw();
RECT rAll = { 0, 0, m_nWidth, m_nHeight };
SetBkColor(hDC, bkColor);
ExtTextOut(hDC, 0, 0, ETO_OPAQUE, &rAll, NULL, 0, NULL);
endDraw();
}
HDC Canvas::beginDraw()
{
if (!m_pBMIH)
{
m_pBMIH = new BITMAPINFOHEADER;
m_pBMIH->biSize = sizeof(BITMAPINFOHEADER);
m_pBMIH->biWidth = m_nWidth;
m_pBMIH->biHeight = m_nHeight;
m_pBMIH->biPlanes = 1;
m_pBMIH->biBitCount = 8 * m_nChannels;
m_pBMIH->biCompression = BI_RGB;
m_pBMIH->biSizeImage = m_nChannels * m_nWidth * m_nHeight;
m_pBMIH->biXPelsPerMeter = 0;
m_pBMIH->biYPelsPerMeter = 0;
m_pBMIH->biClrUsed = 0;
m_pBMIH->biClrImportant = 0;
BYTE* pData = 0;
m_hDC = CreateCompatibleDC(NULL);
m_hBmp = CreateDIBSection(m_hDC, reinterpret_cast<BITMAPINFO*>(m_pBMIH), DIB_RGB_COLORS, reinterpret_cast<void**>(&pData), NULL, 0);
}
m_hOldBmp = SelectObject(m_hDC, m_hBmp);
return m_hDC;
}
void Canvas::endDraw()
{
SelectObject(m_hDC, m_hOldBmp);
m_hOldBmp = NULL;
}
bool Canvas::getDigest(Digest& digest)
{
// we don't have a digest if the image is uninitialized
if (!m_pBMIH)
return false;
// read data from DIB
int nSize = m_nLineLength * m_nHeight;
BYTE* pData = new BYTE[nSize];
ZeroMemory(pData, nSize);
if (GetDIBits(m_hDC, m_hBmp, 0, m_nHeight, pData, reinterpret_cast<BITMAPINFO*>(m_pBMIH), DIB_RGB_COLORS) != m_nHeight)
{
delete[] pData;
return false;
}
// apply transparency, if any
updateTrans(pData);
// calculate hash
mir_sha1_hash(pData, nSize, digest.m_Digest);
delete[] pData;
return true;
}
bool Canvas::writePNG(const mu_text* szFileName)
{
// read data from DIB
BYTE* pData = new BYTE[m_nLineLength * m_nHeight];
if (GetDIBits(m_hDC, m_hBmp, 0, m_nHeight, pData, reinterpret_cast<BITMAPINFO*>(m_pBMIH), DIB_RGB_COLORS) != m_nHeight)
{
delete[] pData;
return false;
}
// apply transparency, if any
updateTrans(pData);
// calculate resulting image size
long png_len = 0;
if (!mu::png::dibToPng(m_pBMIH, pData, 0, &png_len) || png_len == 0)
{
delete[] pData;
return false;
}
// get the resulting image data
BYTE* pRawPNG = new BYTE[png_len];
png_len = 0;
if (!mu::png::dibToPng(m_pBMIH, pData, pRawPNG, &png_len))
{
delete[] pData;
delete[] pRawPNG;
return false;
}
// write image data to file
FILE* fp = _tfopen(szFileName, muT("wb"));
if (!fp)
{
delete[] pData;
delete[] pRawPNG;
return false;
}
fwrite(pRawPNG, 1, png_len, fp);
fclose(fp);
// free buffers
delete[] pRawPNG;
delete[] pData;
return true;
}
|
