|
1 // Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies). |
|
2 // All rights reserved. |
|
3 // This component and the accompanying materials are made available |
|
4 // under the terms of "Eclipse Public License v1.0" |
|
5 // which accompanies this distribution, and is available |
|
6 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
|
7 // |
|
8 // Initial Contributors: |
|
9 // Nokia Corporation - initial contribution. |
|
10 // |
|
11 // Contributors: |
|
12 // |
|
13 // Description: |
|
14 // |
|
15 |
|
16 #include "PngScanlineEncoder.h" |
|
17 |
|
18 // CPngWriteSubCodec |
|
19 CPngWriteSubCodec* CPngWriteSubCodec::NewL(const TPngImageInformation& aInfo, const CFbsBitmap* aSource) |
|
20 { |
|
21 CPngWriteSubCodec* self = NULL; |
|
22 |
|
23 switch (aInfo.iBitDepth) |
|
24 { |
|
25 case 1: |
|
26 self = new(ELeave) CBitDepth1Encoder; |
|
27 break; |
|
28 case 2: |
|
29 self = new(ELeave) CBitDepth2Encoder; |
|
30 break; |
|
31 case 4: |
|
32 self = new(ELeave) CBitDepth4Encoder; |
|
33 break; |
|
34 case 8: |
|
35 switch (aInfo.iColorType) |
|
36 { |
|
37 case TPngImageInformation::EGrayscale: |
|
38 case TPngImageInformation::EIndexedColor: |
|
39 self = new(ELeave) CBitDepth8Encoder; |
|
40 break; |
|
41 case TPngImageInformation::EDirectColor: |
|
42 self = new(ELeave) CBitDepth8ColorType2Encoder; |
|
43 break; |
|
44 default: |
|
45 User::Leave(KErrNotSupported); |
|
46 break; |
|
47 } |
|
48 break; |
|
49 default: |
|
50 User::Leave(KErrNotSupported); |
|
51 break; |
|
52 } |
|
53 ASSERT(self); |
|
54 CleanupStack::PushL(self); |
|
55 self->ConstructL(aInfo, aSource); |
|
56 CleanupStack::Pop(self); |
|
57 return self; |
|
58 } |
|
59 |
|
60 CPngWriteSubCodec::CPngWriteSubCodec() |
|
61 : iScanlineDes(NULL, 0) |
|
62 { |
|
63 } |
|
64 |
|
65 CPngWriteSubCodec::~CPngWriteSubCodec() |
|
66 { |
|
67 delete iScanlineBuffer; |
|
68 delete iPalette; |
|
69 } |
|
70 |
|
71 void CPngWriteSubCodec::ConstructL(const TPngImageInformation& aInfo, const CFbsBitmap* aSource) |
|
72 { |
|
73 iInfo = aInfo; |
|
74 iSource = aSource; |
|
75 iScanlineBufferSize = ScanlineBufferSize(iInfo.iSize.iWidth); |
|
76 iScanlineBuffer = HBufC8::NewMaxL(iScanlineBufferSize); |
|
77 iScanlineDes.Set(&(iScanlineBuffer->Des())[0], iScanlineBufferSize, iScanlineBufferSize); |
|
78 |
|
79 // Init stuff specific to derived class |
|
80 DoConstructL(); |
|
81 } |
|
82 |
|
83 void CPngWriteSubCodec::DoConstructL() |
|
84 { |
|
85 } |
|
86 |
|
87 TDes8& CPngWriteSubCodec::Buffer() |
|
88 { |
|
89 iScanlineDes.FillZ(); |
|
90 return iScanlineDes; |
|
91 } |
|
92 |
|
93 TDes8& CPngWriteSubCodec::EncodeL(const TInt aScanline) |
|
94 { |
|
95 if (aScanline < iInfo.iSize.iHeight) |
|
96 { |
|
97 TUint8* dataPtr = const_cast<TUint8*>(iScanlineDes.Ptr()); |
|
98 const TUint8* dataPtrLimit = dataPtr + iScanlineBufferSize; |
|
99 |
|
100 DoEncode(iSource, aScanline, dataPtr, dataPtrLimit); |
|
101 } |
|
102 else |
|
103 { |
|
104 iScanlineDes.Set(NULL, 0, 0); |
|
105 } |
|
106 return iScanlineDes; |
|
107 } |
|
108 |
|
109 TUint8 CPngWriteSubCodec::ReverseBits(const TUint8 aValue) const |
|
110 { |
|
111 TUint value = aValue; |
|
112 TUint reverseVal = 0; |
|
113 for (TInt i = 0; i < 8; i++) |
|
114 { |
|
115 reverseVal <<= 1; |
|
116 reverseVal |= value & 1; |
|
117 value >>= 1; |
|
118 } |
|
119 return TUint8(reverseVal); |
|
120 } |
|
121 |
|
122 void CPngWriteSubCodec::EncodePalettedScanline(TUint8* aDataPtr, const CFbsBitmap* aSource, const TInt aScanline, |
|
123 const TInt aPixelsPerByte, const TInt aShiftValue) |
|
124 { |
|
125 // Encode a single scanline with indexes into the current palette |
|
126 ASSERT(iInfo.iPalettePresent); |
|
127 TPoint pos(0, aScanline); |
|
128 const TInt scanLength = iInfo.iSize.iWidth; |
|
129 for (TInt i=0; i < scanLength; i += aPixelsPerByte) |
|
130 { |
|
131 // Pack each byte with 'aPixelsPerByte' index values |
|
132 TUint8 pixels = 0; |
|
133 for (TInt j=0; j < aPixelsPerByte; j++) |
|
134 { |
|
135 pixels <<= aShiftValue; |
|
136 TRgb rgb; |
|
137 aSource->GetPixel(rgb, pos); |
|
138 pixels |= TUint8(iPalette->NearestIndex(rgb)); |
|
139 pos.iX++; |
|
140 } |
|
141 *aDataPtr = pixels; |
|
142 aDataPtr++; |
|
143 } |
|
144 } |
|
145 |
|
146 // CBitDepth1Encoder |
|
147 void CBitDepth1Encoder::DoConstructL() |
|
148 { |
|
149 if (iInfo.iColorType == TPngImageInformation::EIndexedColor) |
|
150 { |
|
151 // Setup palette |
|
152 iPalette = CPalette::NewL(2); |
|
153 iPalette->SetEntry(0, KRgbBlack); |
|
154 iPalette->SetEntry(1, KRgbWhite); |
|
155 iInfo.iPalettePresent = ETrue; |
|
156 } |
|
157 } |
|
158 |
|
159 TInt CBitDepth1Encoder::ScanlineBufferSize(TInt aPixelLength) |
|
160 { |
|
161 // 8 pixels per byte |
|
162 return ((aPixelLength + KPngDepth1RoundUpValue) / KPngDepth1PixelsPerByte) + KPngScanlineFilterTypeLength; |
|
163 } |
|
164 |
|
165 void CBitDepth1Encoder::DoEncode(const CFbsBitmap* aSource, const TInt aScanline, |
|
166 TUint8* aDataPtr, const TUint8* aDataPtrLimit) |
|
167 { |
|
168 // Filter method |
|
169 PtrWriteUtil::WriteInt8(aDataPtr, iInfo.iFilterMethod); |
|
170 aDataPtr++; |
|
171 |
|
172 // Pixel data |
|
173 const TInt scanLength = iInfo.iSize.iWidth; |
|
174 if (iInfo.iColorType == TPngImageInformation::EIndexedColor) |
|
175 { |
|
176 // Write palette indexes |
|
177 EncodePalettedScanline(aDataPtr, aSource, aScanline, KPngDepth1PixelsPerByte, KPngDepth1ShiftValue); |
|
178 } |
|
179 else |
|
180 { |
|
181 // Write RGB data |
|
182 TInt dataLength = (scanLength + KPngDepth1RoundUpValue) / KPngDepth1PixelsPerByte; |
|
183 TPtr8 dataPtr(aDataPtr, dataLength, dataLength); |
|
184 |
|
185 aSource->GetScanLine(dataPtr, TPoint(0, aScanline), scanLength, EGray2); |
|
186 |
|
187 // Reverse the order of the bits |
|
188 while (aDataPtr < aDataPtrLimit) |
|
189 { |
|
190 aDataPtr[0] = ReverseBits(aDataPtr[0]); |
|
191 aDataPtr++; |
|
192 } |
|
193 } |
|
194 } |
|
195 |
|
196 // CBitDepth2Encoder |
|
197 void CBitDepth2Encoder::DoConstructL() |
|
198 { |
|
199 if (iInfo.iColorType == TPngImageInformation::EIndexedColor) |
|
200 { |
|
201 // Setup palette entries |
|
202 iPalette = CPalette::NewL(4); |
|
203 iPalette->SetEntry(0, KRgbBlack); |
|
204 iPalette->SetEntry(1, KRgbDarkGray); |
|
205 iPalette->SetEntry(2, KRgbGray); |
|
206 iPalette->SetEntry(3, KRgbWhite); |
|
207 iInfo.iPalettePresent = ETrue; |
|
208 } |
|
209 } |
|
210 |
|
211 TInt CBitDepth2Encoder::ScanlineBufferSize(TInt aPixelLength) |
|
212 { |
|
213 return ((aPixelLength + KPngDepth2RoundUpValue) / KPngDepth2PixelsPerByte) + KPngScanlineFilterTypeLength; |
|
214 } |
|
215 |
|
216 void CBitDepth2Encoder::DoEncode(const CFbsBitmap* aSource, const TInt aScanline, |
|
217 TUint8* aDataPtr, const TUint8* aDataPtrLimit) |
|
218 { |
|
219 // Filter method |
|
220 PtrWriteUtil::WriteInt8(aDataPtr, iInfo.iFilterMethod); |
|
221 aDataPtr++; |
|
222 |
|
223 // Pixel data |
|
224 const TInt scanLength = iInfo.iSize.iWidth; |
|
225 if (iInfo.iColorType == TPngImageInformation::EIndexedColor) |
|
226 { |
|
227 // Write palette indexes |
|
228 EncodePalettedScanline(aDataPtr, aSource, aScanline, KPngDepth2PixelsPerByte, KPngDepth2ShiftValue); |
|
229 } |
|
230 else |
|
231 { |
|
232 // RGB values |
|
233 TPtr8 dataPtr(aDataPtr, (scanLength + KPngDepth2RoundUpValue) / KPngDepth2PixelsPerByte); |
|
234 aSource->GetScanLine(dataPtr, TPoint(0, aScanline), scanLength, EGray4); |
|
235 |
|
236 // Reverse the order of the bits |
|
237 while (aDataPtr < aDataPtrLimit) |
|
238 { |
|
239 TUint8 value = aDataPtr[0]; |
|
240 TUint8 reverse = 0; |
|
241 for (TInt i=0; i < KPngDepth2PixelsPerByte; i++) |
|
242 { |
|
243 reverse <<= 2; // advance the bits for the reverse value |
|
244 reverse |= value & 0x3; // mask off the 2 bits, then OR with existing reverse value |
|
245 value >>= 2; // advance the bits for the actual value |
|
246 } |
|
247 aDataPtr[0] = reverse; |
|
248 aDataPtr++; |
|
249 } |
|
250 } |
|
251 } |
|
252 |
|
253 // CBitDepth4Encoder |
|
254 void CBitDepth4Encoder::DoConstructL() |
|
255 { |
|
256 if (iInfo.iColorType == TPngImageInformation::EIndexedColor) |
|
257 { |
|
258 // Calculate palette for image |
|
259 iPalette = CPalette::NewDefaultL(EColor16); |
|
260 iInfo.iPalettePresent = ETrue; |
|
261 } |
|
262 } |
|
263 |
|
264 TInt CBitDepth4Encoder::ScanlineBufferSize(TInt aPixelLength) |
|
265 { |
|
266 return ((aPixelLength + KPngDepth4RoundUpValue) / KPngDepth4PixelsPerByte) + KPngScanlineFilterTypeLength; |
|
267 } |
|
268 |
|
269 void CBitDepth4Encoder::DoEncode(const CFbsBitmap* aSource, const TInt aScanline, |
|
270 TUint8* aDataPtr, const TUint8* aDataPtrLimit) |
|
271 { |
|
272 // Filter method |
|
273 PtrWriteUtil::WriteInt8(aDataPtr, iInfo.iFilterMethod); |
|
274 aDataPtr++; |
|
275 |
|
276 // Pixel data |
|
277 const TInt scanLength = iInfo.iSize.iWidth; |
|
278 if (iInfo.iColorType == TPngImageInformation::EIndexedColor) |
|
279 { |
|
280 // Write palette indexes |
|
281 EncodePalettedScanline(aDataPtr, aSource, aScanline, KPngDepth4PixelsPerByte, KPngDepth4ShiftValue); |
|
282 } |
|
283 else |
|
284 { |
|
285 TPtr8 dataPtr(aDataPtr, (scanLength + KPngDepth4RoundUpValue) / KPngDepth4PixelsPerByte); |
|
286 aSource->GetScanLine(dataPtr, TPoint(0, aScanline), scanLength, |
|
287 (iInfo.iColorType == TPngImageInformation::EDirectColor) ? EColor16 : EGray16); |
|
288 |
|
289 // Swap order of the low/high bits |
|
290 while (aDataPtr < aDataPtrLimit) |
|
291 { |
|
292 TUint value = aDataPtr[0]; |
|
293 TUint low = value << KPngDepth4ShiftValue; |
|
294 TUint high = value >> KPngDepth4ShiftValue; |
|
295 aDataPtr[0] = TUint8(low | high); |
|
296 aDataPtr++; |
|
297 } |
|
298 } |
|
299 } |
|
300 |
|
301 // CBitDepth8ColorType2Encoder |
|
302 TInt CBitDepth8ColorType2Encoder::ScanlineBufferSize(TInt aPixelLength) |
|
303 { |
|
304 return (aPixelLength * KPngDepth8RgbBytesPerPixel) + KPngScanlineFilterTypeLength; |
|
305 } |
|
306 |
|
307 void CBitDepth8ColorType2Encoder::DoEncode(const CFbsBitmap* aSource, const TInt aScanline, |
|
308 TUint8* aDataPtr, const TUint8* aDataPtrLimit) |
|
309 { |
|
310 // Filter method |
|
311 PtrWriteUtil::WriteInt8(aDataPtr, iInfo.iFilterMethod); |
|
312 aDataPtr++; |
|
313 |
|
314 // Pixel data |
|
315 TPtr8 dataPtr(aDataPtr, iInfo.iSize.iWidth * KPngDepth8RgbBytesPerPixel); |
|
316 aSource->GetScanLine(dataPtr, TPoint(0, aScanline), iInfo.iSize.iWidth, EColor16M); |
|
317 |
|
318 while (aDataPtr < aDataPtrLimit) |
|
319 { |
|
320 // Swap the red and blue components of the image data |
|
321 TUint8 temp = aDataPtr[0]; // temp = Red |
|
322 aDataPtr[0] = aDataPtr[2]; // Red = Blue |
|
323 aDataPtr[2] = temp; // Blue = temp |
|
324 aDataPtr += KPngDepth8RgbBytesPerPixel; |
|
325 } |
|
326 } |
|
327 |
|
328 // CBitDepth8Encoder |
|
329 void CBitDepth8Encoder::DoConstructL() |
|
330 { |
|
331 if (iInfo.iColorType == TPngImageInformation::EIndexedColor) |
|
332 { |
|
333 // Calculate palette for image |
|
334 iPalette = CPalette::NewDefaultL(EColor256); |
|
335 iInfo.iPalettePresent = ETrue; |
|
336 } |
|
337 } |
|
338 |
|
339 TInt CBitDepth8Encoder::ScanlineBufferSize(TInt aPixelLength) |
|
340 { |
|
341 return aPixelLength + KPngScanlineFilterTypeLength; |
|
342 } |
|
343 |
|
344 void CBitDepth8Encoder::DoEncode(const CFbsBitmap* aSource, const TInt aScanline, |
|
345 TUint8* aDataPtr, const TUint8* /*aDataPtrLimit*/) |
|
346 { |
|
347 // Filter method |
|
348 PtrWriteUtil::WriteInt8(aDataPtr, iInfo.iFilterMethod); |
|
349 aDataPtr++; |
|
350 |
|
351 const TInt scanLength = iInfo.iSize.iWidth; |
|
352 if (iInfo.iColorType == TPngImageInformation::EIndexedColor) |
|
353 { |
|
354 // Write palette indexes |
|
355 EncodePalettedScanline(aDataPtr, aSource, aScanline, KPngDepth8PixelsPerByte, KPngDepth8ShiftValue); |
|
356 } |
|
357 else |
|
358 { |
|
359 // Pixel data |
|
360 TPtr8 dataPtr(aDataPtr, scanLength); |
|
361 aSource->GetScanLine(dataPtr, TPoint(0, aScanline), scanLength, EGray256); |
|
362 } |
|
363 } |