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1 : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
2 : /*
3 : * This file is part of the LibreOffice project.
4 : *
5 : * This Source Code Form is subject to the terms of the Mozilla Public
6 : * License, v. 2.0. If a copy of the MPL was not distributed with this
7 : * file, You can obtain one at http://mozilla.org/MPL/2.0/.
8 : *
9 : * This file incorporates work covered by the following license notice:
10 : *
11 : * Licensed to the Apache Software Foundation (ASF) under one or more
12 : * contributor license agreements. See the NOTICE file distributed
13 : * with this work for additional information regarding copyright
14 : * ownership. The ASF licenses this file to you under the Apache
15 : * License, Version 2.0 (the "License"); you may not use this file
16 : * except in compliance with the License. You may obtain a copy of
17 : * the License at http://www.apache.org/licenses/LICENSE-2.0 .
18 : */
19 :
20 : #ifndef INCLUDED_BASEBMP_RGBMASKPIXELFORMATS_HXX
21 : #define INCLUDED_BASEBMP_RGBMASKPIXELFORMATS_HXX
22 :
23 : #include <basebmp/color.hxx>
24 : #include <basebmp/colortraits.hxx>
25 : #include <basebmp/accessor.hxx>
26 : #include <basebmp/pixeliterator.hxx>
27 : #include <basebmp/pixelformatadapters.hxx>
28 : #include <basebmp/metafunctions.hxx>
29 : #include <basebmp/endian.hxx>
30 :
31 : #include <vigra/numerictraits.hxx>
32 : #include <vigra/metaprogramming.hxx>
33 :
34 : #include <functional>
35 :
36 : namespace basebmp
37 : {
38 :
39 : /** Base class operating on RGB truecolor mask pixel
40 :
41 : Use this template, if you have an (integer) pixel type, and three
42 : bitmasks denoting where the channel bits are.
43 :
44 : @tpl PixelType
45 : Input pixel type to operate on
46 :
47 : @tpl ColorType
48 : Underlying color type, to convert the pixel values into
49 :
50 : @tpl RedMask
51 : Bitmask, to access the red bits in the data type
52 :
53 : @tpl GreenMask
54 : Bitmask, to access the green bits in the data type
55 :
56 : @tpl BlueMask
57 : Bitmask, to access the blue bits in the data type
58 :
59 : @tpl SwapBytes
60 : When true, the final pixel values will be byte-swapped before
61 : passed on.
62 : */
63 : template< typename PixelType,
64 : typename ColorType,
65 : unsigned int RedMask,
66 : unsigned int GreenMask,
67 : unsigned int BlueMask,
68 : bool SwapBytes > struct RGBMaskFunctorBase
69 : {
70 : typedef PixelType pixel_type;
71 : typedef ColorType color_type;
72 : typedef typename make_unsigned<pixel_type>::type unsigned_pixel_type;
73 : typedef typename ColorTraits<ColorType>::component_type component_type;
74 :
75 : // calc corrective shifts for all three channels in advance
76 : enum {
77 : red_shift = numberOfTrailingZeros<RedMask>::value,
78 : green_shift = numberOfTrailingZeros<GreenMask>::value,
79 : blue_shift = numberOfTrailingZeros<BlueMask>::value,
80 :
81 : red_bits = bitcount<RedMask>::value,
82 : green_bits = bitcount<GreenMask>::value,
83 : blue_bits = bitcount<BlueMask>::value
84 : };
85 : };
86 :
87 : template< typename PixelType,
88 : typename ColorType,
89 : unsigned int RedMask,
90 : unsigned int GreenMask,
91 : unsigned int BlueMask,
92 : bool SwapBytes > struct RGBMaskGetter :
93 : public RGBMaskFunctorBase<PixelType,
94 : ColorType,
95 : RedMask,
96 : GreenMask,
97 : BlueMask,
98 : SwapBytes>,
99 : public std::unary_function<PixelType, ColorType>
100 : {
101 : typedef RGBMaskFunctorBase<PixelType,
102 : ColorType,
103 : RedMask,
104 : GreenMask,
105 : BlueMask,
106 : SwapBytes> base_type;
107 :
108 6730 : ColorType operator()( PixelType v ) const
109 : {
110 6730 : v = SwapBytes ? byteSwap(v) : v;
111 :
112 6730 : const typename base_type::unsigned_pixel_type red (v & RedMask);
113 6730 : const typename base_type::unsigned_pixel_type green(v & GreenMask);
114 6730 : const typename base_type::unsigned_pixel_type blue (v & BlueMask);
115 :
116 : // shift color nibbles to right-aligend position. ORing it
117 : // channel value shifted twice the number of channel bits, to
118 : // spread the value into the component_type range
119 : ColorType res( (shiftRight(red,
120 : base_type::red_shift-8*
121 : (signed)sizeof(typename base_type::component_type)+
122 : base_type::red_bits)) |
123 : (shiftRight(red,
124 : base_type::red_shift-8*
125 : (signed)sizeof(typename base_type::component_type)+
126 : 2*base_type::red_bits)),
127 :
128 : (shiftRight(green,
129 : base_type::green_shift-8*
130 : (signed)sizeof(typename base_type::component_type)+
131 : base_type::green_bits)) |
132 : (shiftRight(green,
133 : base_type::green_shift-8*
134 : (signed)sizeof(typename base_type::component_type)+
135 : 2*base_type::green_bits)),
136 :
137 : (shiftRight(blue,
138 : base_type::blue_shift-8*
139 : (signed)sizeof(typename base_type::component_type)+
140 : base_type::blue_bits)) |
141 : (shiftRight(blue,
142 : base_type::blue_shift-8*
143 : (signed)sizeof(typename base_type::component_type)+
144 6730 : 2*base_type::blue_bits)) );
145 6730 : return res;
146 : }
147 : };
148 :
149 : template< typename PixelType,
150 : typename ColorType,
151 : unsigned int RedMask,
152 : unsigned int GreenMask,
153 : unsigned int BlueMask,
154 : bool SwapBytes > struct RGBMaskSetter :
155 : public RGBMaskFunctorBase<PixelType,
156 : ColorType,
157 : RedMask,
158 : GreenMask,
159 : BlueMask,
160 : SwapBytes>,
161 : public std::unary_function<ColorType, PixelType>
162 : {
163 : typedef RGBMaskFunctorBase<PixelType,
164 : ColorType,
165 : RedMask,
166 : GreenMask,
167 : BlueMask,
168 : SwapBytes> base_type;
169 :
170 557 : PixelType operator()( ColorType const& c ) const
171 : {
172 557 : const typename base_type::unsigned_pixel_type red (c.getRed());
173 557 : const typename base_type::unsigned_pixel_type green(c.getGreen());
174 557 : const typename base_type::unsigned_pixel_type blue (c.getBlue());
175 :
176 : typename base_type::unsigned_pixel_type res(
177 : (shiftLeft(red,
178 : base_type::red_shift-8*
179 : (signed)sizeof(typename base_type::component_type)+
180 : base_type::red_bits) & RedMask) |
181 : (shiftLeft(green,
182 : base_type::green_shift-8*
183 : (signed)sizeof(typename base_type::component_type)+
184 : base_type::green_bits) & GreenMask) |
185 : (shiftLeft(blue,
186 : base_type::blue_shift-8*
187 : (signed)sizeof(typename base_type::component_type)+
188 557 : base_type::blue_bits) & BlueMask) );
189 :
190 557 : return SwapBytes ? byteSwap(res) : res;
191 : }
192 : };
193 :
194 : //-----------------------------------------------------------------------------
195 :
196 : template< typename PixelType,
197 : unsigned int RedMask,
198 : unsigned int GreenMask,
199 : unsigned int BlueMask,
200 : bool SwapBytes > struct PixelFormatTraitsTemplate_RGBMask
201 : {
202 : typedef PixelType pixel_type;
203 :
204 : typedef RGBMaskGetter<pixel_type,
205 : Color,
206 : RedMask,
207 : GreenMask,
208 : BlueMask,
209 : SwapBytes> getter_type;
210 : typedef RGBMaskSetter<pixel_type,
211 : Color,
212 : RedMask,
213 : GreenMask,
214 : BlueMask,
215 : SwapBytes> setter_type;
216 :
217 : typedef PixelIterator<pixel_type> iterator_type;
218 : typedef StandardAccessor<pixel_type> raw_accessor_type;
219 : typedef AccessorSelector<
220 : getter_type, setter_type> accessor_selector;
221 : };
222 :
223 : //-----------------------------------------------------------------------------
224 :
225 : // Hopefully this is an understandable plaintext explanation that matches
226 : // reality...
227 :
228 : // BASEBMP_TRUECOLORMASK_LSB_SWAP means that on a big-endian platform, a pixel
229 : // value when viewed as an integer (16 or 32 bits) has to be byte-swapped for
230 : // the channels to match the masks. Or equivalently (I think), on a big-endian
231 : // platform, the masks need to be byte-swapped to be correct.
232 :
233 : // I.e. on a litte-endian platform the masks work as such.
234 :
235 : // BASEBMP_TRUECOLORMASK_MSB_SWAP means the opposite. The masks work as such
236 : // on big-endian platforms, on little-endian platforms the pixel needs to be
237 : // byte-swapped for the masks to work.
238 :
239 : // So in a sense these two names are "backward". It sounds to me as if
240 : // BASEBMP_TRUECOLORMASK_LSB_SWAP would mean "when on LSB, swap" ;)
241 :
242 : #ifdef OSL_LITENDIAN
243 : # define BASEBMP_TRUECOLORMASK_LSB_SWAP false
244 : # define BASEBMP_TRUECOLORMASK_MSB_SWAP true
245 : #else
246 : # ifdef OSL_BIGENDIAN
247 : # define BASEBMP_TRUECOLORMASK_LSB_SWAP true
248 : # define BASEBMP_TRUECOLORMASK_MSB_SWAP false
249 : # else
250 : # error Undetermined endianness!
251 : # endif
252 : #endif
253 :
254 : //-----------------------------------------------------------------------------
255 :
256 : // 16bpp MSB RGB
257 : typedef PixelFormatTraitsTemplate_RGBMask<
258 : sal_uInt16,
259 : 0xF800,
260 : 0x07E0,
261 : 0x001F,
262 : BASEBMP_TRUECOLORMASK_MSB_SWAP > PixelFormatTraits_RGB16_565_MSB;
263 : BASEBMP_SPECIALIZE_ACCESSORTRAITS(PixelFormatTraits_RGB16_565_MSB::getter_type,
264 : PixelFormatTraits_RGB16_565_MSB::setter_type);
265 :
266 : // 16bpp LSB RGB
267 : typedef PixelFormatTraitsTemplate_RGBMask<
268 : sal_uInt16,
269 : 0xF800,
270 : 0x07E0,
271 : 0x001F,
272 : BASEBMP_TRUECOLORMASK_LSB_SWAP > PixelFormatTraits_RGB16_565_LSB;
273 : BASEBMP_SPECIALIZE_ACCESSORTRAITS(PixelFormatTraits_RGB16_565_LSB::getter_type,
274 : PixelFormatTraits_RGB16_565_LSB::setter_type);
275 :
276 :
277 : // 32bpp formats
278 :
279 : // The intent is that the order of channel names in the names of the 32bpp
280 : // format typedefs below correspond to the order of the channel bytes in
281 : // memory, if I understand correctly.... I think the point with the below
282 : // formats is that the channel byte order in memory is the same regardless of
283 : // platform byte order.
284 :
285 : // This one used to be called PixelFormatTraits_RGB32_888.
286 :
287 : typedef PixelFormatTraitsTemplate_RGBMask<
288 : sal_uInt32,
289 : 0x00FF0000,
290 : 0x0000FF00,
291 : 0x000000FF,
292 : BASEBMP_TRUECOLORMASK_LSB_SWAP > PixelFormatTraits_BGRX32_8888;
293 : BASEBMP_SPECIALIZE_ACCESSORTRAITS(PixelFormatTraits_BGRX32_8888::getter_type,
294 : PixelFormatTraits_BGRX32_8888::setter_type);
295 :
296 : // This one used to be called PixelFormatTraits_BGR32_888.
297 :
298 : typedef PixelFormatTraitsTemplate_RGBMask<
299 : sal_uInt32,
300 : 0x00FF0000,
301 : 0x0000FF00,
302 : 0x000000FF,
303 : BASEBMP_TRUECOLORMASK_MSB_SWAP > PixelFormatTraits_XRGB32_8888;
304 : BASEBMP_SPECIALIZE_ACCESSORTRAITS(PixelFormatTraits_XRGB32_8888::getter_type,
305 : PixelFormatTraits_XRGB32_8888::setter_type);
306 :
307 : // The following two ones were added for Android needs and for completeness
308 :
309 : typedef PixelFormatTraitsTemplate_RGBMask<
310 : sal_uInt32,
311 : 0xFF000000,
312 : 0x00FF0000,
313 : 0x0000FF00,
314 : BASEBMP_TRUECOLORMASK_LSB_SWAP > PixelFormatTraits_XBGR32_8888;
315 : BASEBMP_SPECIALIZE_ACCESSORTRAITS(PixelFormatTraits_XBGR32_8888::getter_type,
316 : PixelFormatTraits_XBGR32_8888::setter_type);
317 :
318 : typedef PixelFormatTraitsTemplate_RGBMask<
319 : sal_uInt32,
320 : 0xFF000000,
321 : 0x00FF0000,
322 : 0x0000FF00,
323 : BASEBMP_TRUECOLORMASK_MSB_SWAP > PixelFormatTraits_RGBX32_8888;
324 : BASEBMP_SPECIALIZE_ACCESSORTRAITS(PixelFormatTraits_RGBX32_8888::getter_type,
325 : PixelFormatTraits_RGBX32_8888::setter_type);
326 :
327 : } // namespace basebmp
328 :
329 : #endif /* INCLUDED_BASEBMP_RGBMASKPIXELFORMATS_HXX */
330 :
331 : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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