qpixelformat.cpp

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39-
40#include "qpixelformat.h"-
41-
42QT_BEGIN_NAMESPACE-
43-
44/*!-
45 \class QPixelFormat-
46 \inmodule QtGui-
47 \since 5.4-
48 \brief QPixelFormat is a class for describing different pixel-
49 layouts in graphics buffers-
50-
51 In Qt there is a often a need to represent the layout of the pixels in a-
52 graphics buffer. Internally QPixelFormat stores everything in a 64 bit-
53 datastructure. This gives performance but also some limitations.-
54-
55 QPixelFormat can describe 5 color channels and 1 alpha channel, each can use-
56 6 bits to describe the size of the color channel.-
57-
58 The position of the alpha channel is described with a separate enum. This is-
59 to make it possible to describe QImage formats like ARGB32, and also-
60 describe typical OpenGL formats like RBGA8888.-
61-
62 How pixels are suppose to be read is determined by the TypeInterpretation-
63 enum. It describes if color values are suppose to be read byte per byte,-
64 or if a pixel is suppose to be read as a complete int and then masked.-
65 \sa TypeInterpretation-
66-
67 There is no support for describing YUV's macro pixels. Instead a list of YUV-
68 formats has been made. When a QPixelFormat is describing a YUV format, the-
69 bitsPerPixel value has been deduced by the YUV Layout enum. Also, the color-
70 channels should all be set to zero except the fifth color channel that-
71 should store the bitsPerPixel value.-
72*/-
73-
74/*!-
75 \enum QPixelFormat::ColorModel-
76-
77 This enum type is used to describe the color model of the pixelformat.-
78 Alpha was added in 5.5.-
79-
80 \value RGB The color model is RGB.-
81-
82 \value BGR This is logically the opposite endian version of RGB. However,-
83 for ease of use it has its own model.-
84-
85 \value Indexed The color model uses a color palette.-
86-
87 \value Grayscale The color model is Grayscale.-
88-
89 \value CMYK The color model is CMYK.-
90-
91 \value HSL The color model is HSL.-
92-
93 \value HSV The color model is HSV.-
94-
95 \value YUV The color model is YUV.-
96-
97 \value Alpha There is no color model, only alpha is used.-
98*/-
99-
100/*!-
101 \enum QPixelFormat::AlphaUsage-
102-
103 This enum describes if the alpha channel is used or not. Sometimes the-
104 pixelformat will have a size for the alpha channel, but the pixel format-
105 does actually not use the alpha channel. For example RGB32 is such a-
106 format. The RGB channels are 8 bits each, and there is no alpha channel.-
107 But the complete size for each pixel is 32. Therefore the alpha channel size-
108 is 8, but the alpha channel is ignored. Its important to note that in such-
109 situations the position of the alpha channel is significant.-
110-
111 \value IgnoresAlpha The alpha channel is not used.-
112-
113 \value UsesAlpha The alpha channel is used.-
114*/-
115-
116/*!-
117 \enum QPixelFormat::AlphaPosition-
118-
119 This enum type is used to describe the alpha channels position relative to the-
120 color channels.-
121-
122 \value AtBeginning The alpha channel will be put in front of the color-
123 channels . E.g. ARGB.-
124-
125 \value AtEnd The alpha channel will be put in the back of the color-
126 channels. E.g. RGBA.-
127*/-
128-
129/*!-
130 \enum QPixelFormat::AlphaPremultiplied-
131-
132 This enum type describes the boolean state if the alpha channel is multiplied-
133 into the color channels or not.-
134-
135 \value NotPremultiplied The alpha channel is not multiplied into the color channels.-
136-
137 \value Premultiplied The alpha channel is multiplied into the color channels.-
138*/-
139-
140/*!-
141 \enum QPixelFormat::TypeInterpretation-
142-
143 This enum describes how each pixel is interpreted. If a pixel is read as a-
144 full 32 bit unsigned integer and then each channel is masked out, or if-
145 each byte is read as unsigned char values. Typically QImage formats-
146 interpret one pixel as an unsigned integer and then the color channels are-
147 masked out. OpenGL on the other hand typically interpreted pixels "one byte-
148 after the other", Ie. unsigned byte.-
149-
150 QImage also have the format Format_RGBA8888 (and its derivatives), where-
151 the pixels are interpreted as unsigned bytes. OpenGL has extensions that makes it-
152 possible to upload pixel buffers in an unsigned integer format.-
153-
154 \image qpixelformat-argb32buffer.png An unsigned integer ARGB32 pixel.-
155-
156 The image above shows a ARGB pixel in memory read as an unsigned integer.-
157 However, if this pixel was read byte for byte on a little endian system the-
158 first byte would be the byte containing the B-channel. The next byte would-
159 be the G-channel, then the R-channel and finally the A-channel. This shows-
160 that on little endian systems, how each pixel is interpreted is significant-
161 for integer formats. This is not the case on big endian systems.-
162-
163 \value UnsignedInteger-
164 \value UnsignedShort-
165 \value UnsignedByte-
166 \value FloatingPoint-
167*/-
168-
169/*!-
170 \enum QPixelFormat::ByteOrder-
171-
172 This enum describes the ByteOrder of the pixel format. This enum is mostly-
173 ignored but have some use cases for YUV formats. BGR formats have their own-
174 color model, and should not be described by using the opposite endianness-
175 on an RGB format.-
176-
177 \value LittleEndian The byte order is little endian.-
178 \value BigEndian The byte order is big endian.-
179 \value CurrentSystemEndian This enum will not be stored, but is converted in-
180 the constructor to the endian enum that matches-
181 the enum of the current system.-
182-
183*/-
184-
185/*!-
186 \enum QPixelFormat::YUVLayout-
187-
188 YUV is not represented by describing the size of the color channels. This is-
189 because YUV often use macro pixels, making the concept of sperate color channels-
190 invalid. Instead the different YUV layouts are described with this enum.-
191-
192 \value YUV444-
193 \value YUV422-
194 \value YUV411-
195 \value YUV420P-
196 \value YUV420SP-
197 \value YV12-
198 \value UYVY-
199 \value YUYV-
200 \value NV12-
201 \value NV21-
202 \value IMC1-
203 \value IMC2-
204 \value IMC3-
205 \value IMC4-
206 \value Y8-
207 \value Y16-
208*/-
209-
210/*!-
211 \fn QPixelFormat::QPixelFormat()-
212-
213 Creates a null pixelformat. This format maps to QImage::Format_Invalid.-
214*/-
215-
216/*!-
217 \fn QPixelFormat::QPixelFormat(ColorModel colorModel,-
218 uchar firstSize,-
219 uchar secondSize,-
220 uchar thirdSize,-
221 uchar fourthSize,-
222 uchar fifthSize,-
223 uchar alphaSize,-
224 AlphaUsage alphaUsage,-
225 AlphaPosition alphaPosition,-
226 AlphaPremultiplied premultiplied,-
227 TypeInterpretation typeInterpretation,-
228 ByteOrder byteOrder = CurrentSystemEndian,-
229 uchar subEnum = 0)-
230-
231 Creates a QPixelFormat which assigns its data to the attributes.-
232 \a colorModel will be put into a buffer which is 4 bits long.-
233-
234 \a firstSize \a secondSize \a thirdSize \a fourthSize \a fifthSize \a-
235 alphaSize are all meant to represent the size of a channel. The channels will-
236 be used for different uses dependent on the \a colorModel. For RGB the-
237 firstSize will represent the Red channel. On CMYK it will represent the-
238 value of the Cyan channel.-
239-
240 \a alphaUsage represents if the alpha channel is used or not.-
241-
242 \a alphaPosition is the position of the alpha channel.-
243-
244 \a premultiplied represents if the alpha channel is already multiplied with-
245 the color channels.-
246-
247 \a typeInterpretation is how the pixel is interpreted.-
248-
249 \a byteOrder represents the endianness of the pixelformat. This defaults to-
250 CurrentSystemEndian.-
251-
252 \a subEnum is used for colorModels that have to store some extra-
253 information with supplying an extra enum. This is used by YUV to store the-
254 YUV type The default value is 0.-
255*/-
256-
257/*!-
258 \fn QPixelFormat qPixelFormatRgba(uchar redSize,-
259 uchar greenSize,-
260 uchar blueSize,-
261 uchar alphaSize,-
262 QPixelFormat::AlphaUsage alphaUsage,-
263 QPixelFormat::AlphaPosition alphaPosition,-
264 QPixelFormat::AlphaPremultiplied premultiplied = QPixelFormat::NotPremultiplied,-
265 QPixelFormat::TypeInterpretation typeInterpretation = QPixelFormat::UnsignedInteger)-
266 \relates QPixelFormat-
267-
268 Constructor function making an RGB pixelformat. \a redSize \a greenSize \a-
269 blueSize represent the size of each color channel. \a alphaSize describes-
270 the alpha channel size and its position is described with \a alphaPosition.-
271 \a alphaUsage is used to determine if the alpha channel is used or not.-
272 Setting the alpha channel size to 8 and alphaUsage to IgnoresAlpha is how-
273 it is possible to create a 32 bit format where the rgb channels only use 24-
274 bits combined. \a premultiplied \a typeInterpretation are-
275 accessible with accessors with the same name.-
276-
277 \sa QPixelFormat::TypeInterpretation-
278*/-
279-
280/*!-
281 \fn QPixelFormat qPixelFormatGrayscale(uchar channelSize,-
282 QPixelFormat::TypeInterpretation typeInterpretation = QPixelFormat::UnsignedInteger)-
283 \relates QPixelFormat-
284-
285 Constructor function for creating a Grayscale format. Monochrome formats can be-
286 described by passing 1 to \a channelSize. Its also possible to define very-
287 accurate grayscale formats using doubles to describe each pixel by passing 8-
288 as \a channelSize and FloatingPoint as \a typeInterpretation.-
289-
290 \sa QPixelFormat::TypeInterpretation-
291*/-
292-
293/*!-
294 \fn QPixelFormat qPixelFormatAlpha(uchar channelSize,-
295 QPixelFormat::TypeInterpretation typeInterpretation = QPixelFormat::UnsignedInteger)-
296 \relates QPixelFormat-
297 \since 5.5-
298-
299 Constructor function for creating an Alpha format. A mask format can be-
300 described by passing 1 to \a channelSize. Its also possible to define very-
301 accurate alpha formats using doubles to describe each pixel by passing 8-
302 as \a channelSize and FloatingPoint as \a typeInterpretation.-
303-
304 \sa QPixelFormat::TypeInterpretation-
305*/-
306-
307-
308/*!-
309 \fn QPixelFormat qPixelFormatCmyk(uchar channelSize,-
310 uchar alphaSize = 0,-
311 QPixelFormat::AlphaUsage alphaUsage = QPixelFormat::IgnoresAlpha,-
312 QPixelFormat::AlphaPosition alphaPosition = QPixelFormat::AtBeginning,-
313 QPixelFormat::TypeInterpretation typeInterpretation = QPixelFormat::UnsignedInteger)-
314 \relates QPixelFormat-
315-
316 Constructor function for creating CMYK formats. The channel count will be 4 or-
317 5 depending on if \a alphaSize is bigger than zero or not. The CMYK color-
318 channels will all be set to the value of \a channelSize.-
319-
320 \a alphaUsage \a alphaPosition and \a typeInterpretation are all accessible with-
321 the accessors with the same name.-
322-
323 \sa QPixelFormat::TypeInterpretation-
324*/-
325-
326/*!-
327 \fn QPixelFormat qPixelFormatHsl(uchar channelSize,-
328 uchar alphaSize = 0,-
329 QPixelFormat::AlphaUsage alphaUsage = QPixelFormat::IgnoresAlpha,-
330 QPixelFormat::AlphaPosition alphaPosition = QPixelFormat::AtBeginning,-
331 QPixelFormat::TypeInterpretation typeInterpretation = QPixelFormat::FloatingPoint)-
332 \relates QPixelFormat-
333-
334 Constructor function for creating HSL formats. The channel count will be 3 or 4-
335 depending on if \a alphaSize is bigger than 0.-
336-
337 \a channelSize will set the hueSize saturationSize and lightnessSize to the same value.-
338-
339 \a alphaUsage \a alphaPosition and \a typeInterpretation are all accessible with-
340 the accessors with the same name.-
341*/-
342-
343/*!-
344 \fn QPixelFormat qPixelFormatHsv(uchar channelSize,-
345 uchar alphaSize = 0,-
346 QPixelFormat::AlphaUsage alphaUsage = QPixelFormat::IgnoresAlpha,-
347 QPixelFormat::AlphaPosition alphaPosition = QPixelFormat::AtBeginning,-
348 QPixelFormat::TypeInterpretation typeInterpretation = QPixelFormat::FloatingPoint)-
349 \relates QPixelFormat-
350-
351 Constructor function for creating HSV formats. The channel count will be 3 or 4-
352 depending on if \a alphaSize is bigger than 0.-
353-
354 \a channelSize will set the hueSize saturationSize and brightnessSize to the same value.-
355-
356 \a alphaUsage \a alphaPosition and \a typeInterpretation are all accessible with-
357 the accessors with the same name.-
358*/-
359-
360/*!-
361 \fn QPixelFormat qPixelFormatYuv(QPixelFormat::YUVLayout yuvLayout,-
362 uchar alphaSize = 0,-
363 QPixelFormat::AlphaUsage alphaUsage = QPixelFormat::IgnoresAlpha,-
364 QPixelFormat::AlphaPosition alphaPosition = QPixelFormat::AtBeginning,-
365 QPixelFormat::AlphaPremultiplied premultiplied = QPixelFormat::NotPremultiplied,-
366 QPixelFormat::TypeInterpretation typeInterpretation = QPixelFormat::UnsignedByte,-
367 QPixelFormat::ByteOrder byteOrder = QPixelFormat::LittleEndian)-
368 \relates QPixelFormat-
369-
370 Constructor function for creating a QPixelFormat describing a YUV format with-
371 \a yuvLayout. \a alphaSize describes the size of a potential alpha channel-
372 and is position is described with \a alphaPosition. The "first" "second" ..-
373 "fifth" channels are all set to 0. \a alphaUsage \a premultiplied \a-
374 typeInterpretation and \a byteOrder will work as with other formats.-
375*/-
376-
377/*!-
378 \fn ColorModel QPixelFormat::colorModel() const-
379-
380 Accessor function for getting the colorModel.-
381*/-
382-
383/*!-
384 \fn uchar QPixelFormat::channelCount() const-
385-
386 Accessor function for getting the channelCount. Channel Count is deduced-
387 by color channels with a size > 0 and if the size of the alpha channel is > 0.-
388*/-
389-
390/*!-
391 \fn uchar QPixelFormat::redSize() const-
392-
393 Accessor function for the size of the red color channel.-
394*/-
395-
396/*!-
397 \fn uchar QPixelFormat::greenSize() const-
398-
399 Accessor function for the size of the green color channel.-
400*/-
401-
402/*!-
403 \fn uchar QPixelFormat::blueSize() const-
404-
405 Accessor function for the size of the blue color channel.-
406*/-
407-
408/*!-
409 \fn uchar QPixelFormat::cyanSize() const-
410-
411 Accessor function for the cyan color channel.-
412*/-
413-
414/*!-
415 \fn uchar QPixelFormat::magentaSize() const-
416-
417 Accessor function for the megenta color channel.-
418*/-
419-
420/*!-
421 \fn uchar QPixelFormat::yellowSize() const-
422-
423 Accessor function for the yellow color channel.-
424*/-
425-
426/*!-
427 \fn uchar QPixelFormat::blackSize() const-
428-
429 Accessor function for the black/key color channel.-
430*/-
431-
432/*!-
433 \fn uchar QPixelFormat::hueSize() const-
434-
435 Accessor function for the hue channel size.-
436*/-
437-
438/*!-
439 \fn uchar QPixelFormat::saturationSize() const-
440-
441 Accessor function for the saturation channel size.-
442*/-
443-
444/*!-
445 \fn uchar QPixelFormat::lightnessSize() const-
446-
447 Accessor function for the lightness channel size.-
448*/-
449-
450/*!-
451 \fn uchar QPixelFormat::brightnessSize() const-
452-
453 Accessor function for the brightness channel size.-
454*/-
455-
456/*!-
457 \fn uchar QPixelFormat::alphaSize() const-
458-
459 Accessor function for the alpha channel size.-
460*/-
461-
462/*!-
463 \fn uchar QPixelFormat::bitsPerPixel() const-
464-
465 Accessor function for the bits used per pixel. This function returns the-
466 sum of the color channels + the size of the alpha channel.-
467*/-
468-
469/*!-
470 \fn AlphaPremultiplied QPixelFormat::premultiplied() const-
471-
472 Accessor function for the AlphaPremultiplied enum. This indicates if the-
473 alpha channel is multiplied in to the color channels.-
474-
475*/-
476-
477/*!-
478 \fn TypeInterpretation QPixelFormat::typeInterpretation() const-
479-
480 Accessor function for the type representation of a color channel or a pixel.-
481-
482 \sa TypeInterpretation-
483*/-
484-
485/*!-
486 \fn ByteOrder QPixelFormat::byteOrder() const-
487-
488 The byte order is almost always set the the byte order of the current-
489 system. However, it can be useful to describe some YUV formats. This-
490 function should never return QPixelFormat::CurrentSystemEndian as this-
491 value is translated to a endian value in the constructor.-
492*/-
493-
494/*!-
495 \fn AlphaUsage QPixelFormat::alphaUsage() const-
496-
497 Accessor function for alphaUsage.-
498*/-
499-
500/*!-
501 \fn AlphaPosition QPixelFormat::alphaPosition() const-
502-
503 Accessor function for alphaPosition.-
504*/-
505-
506/*!-
507 \fn YUVLayout QPixelFormat::yuvLayout() const-
508-
509 Accessor function for the YUVLayout. It is difficult to describe the color-
510 channels of a YUV pixel format since YUV color model uses macro pixels.-
511 Instead the layout of the pixels are stored as an enum.-
512*/-
513-
514/*!-
515 \fn uchar QPixelFormat::subEnum() const-
516-
517 Accessor for the datapart which contains subEnums-
518 This is the same as the yuvLayout() function.-
519-
520 \sa yuvLayout()-
521 \internal-
522*/-
523-
524Q_STATIC_ASSERT(sizeof(QPixelFormat) == sizeof(quint64));-
525-
526-
527namespace QtPrivate {-
528 QPixelFormat QPixelFormat_createYUV(QPixelFormat::YUVLayout yuvLayout,-
529 uchar alphaSize,-
530 QPixelFormat::AlphaUsage alphaUsage,-
531 QPixelFormat::AlphaPosition alphaPosition,-
532 QPixelFormat::AlphaPremultiplied premultiplied,-
533 QPixelFormat::TypeInterpretation typeInterpretation,-
534 QPixelFormat::ByteOrder byteOrder)-
535 {-
536 uchar bits_per_pixel = 0;-
537 switch (yuvLayout) {-
538 case QPixelFormat::YUV444:
never executed: case QPixelFormat::YUV444:
0
539 bits_per_pixel = 24;-
540 break;
never executed: break;
0
541 case QPixelFormat::YUV422:
never executed: case QPixelFormat::YUV422:
0
542 bits_per_pixel = 16;-
543 break;
never executed: break;
0
544 case QPixelFormat::YUV411:
never executed: case QPixelFormat::YUV411:
0
545 case QPixelFormat::YUV420P:
never executed: case QPixelFormat::YUV420P:
0
546 case QPixelFormat::YUV420SP:
never executed: case QPixelFormat::YUV420SP:
0
547 case QPixelFormat::YV12:
never executed: case QPixelFormat::YV12:
0
548 bits_per_pixel = 12;-
549 break;
never executed: break;
0
550 case QPixelFormat::UYVY:
never executed: case QPixelFormat::UYVY:
0
551 case QPixelFormat::YUYV:
never executed: case QPixelFormat::YUYV:
0
552 bits_per_pixel = 16;-
553 break;
never executed: break;
0
554 case QPixelFormat::NV12:
never executed: case QPixelFormat::NV12:
0
555 case QPixelFormat::NV21:
never executed: case QPixelFormat::NV21:
0
556 bits_per_pixel = 12;-
557 break;
never executed: break;
0
558 case QPixelFormat::IMC1:
never executed: case QPixelFormat::IMC1:
0
559 case QPixelFormat::IMC2:
never executed: case QPixelFormat::IMC2:
0
560 case QPixelFormat::IMC3:
never executed: case QPixelFormat::IMC3:
0
561 case QPixelFormat::IMC4:
never executed: case QPixelFormat::IMC4:
0
562 bits_per_pixel = 12;-
563 break;
never executed: break;
0
564 case QPixelFormat::Y8:
never executed: case QPixelFormat::Y8:
0
565 bits_per_pixel = 8;-
566 break;
never executed: break;
0
567 case QPixelFormat::Y16:
never executed: case QPixelFormat::Y16:
0
568 bits_per_pixel = 16;-
569 break;
never executed: break;
0
570 }-
571-
572 return QPixelFormat(QPixelFormat::YUV,
never executed: return QPixelFormat(QPixelFormat::YUV, 0, 0, 0, 0, bits_per_pixel, alphaSize, alphaUsage, alphaPosition, premultiplied, typeInterpretation, byteOrder, yuvLayout);
0
573 0, 0, 0, 0,
never executed: return QPixelFormat(QPixelFormat::YUV, 0, 0, 0, 0, bits_per_pixel, alphaSize, alphaUsage, alphaPosition, premultiplied, typeInterpretation, byteOrder, yuvLayout);
0
574 bits_per_pixel,
never executed: return QPixelFormat(QPixelFormat::YUV, 0, 0, 0, 0, bits_per_pixel, alphaSize, alphaUsage, alphaPosition, premultiplied, typeInterpretation, byteOrder, yuvLayout);
0
575 alphaSize,
never executed: return QPixelFormat(QPixelFormat::YUV, 0, 0, 0, 0, bits_per_pixel, alphaSize, alphaUsage, alphaPosition, premultiplied, typeInterpretation, byteOrder, yuvLayout);
0
576 alphaUsage,
never executed: return QPixelFormat(QPixelFormat::YUV, 0, 0, 0, 0, bits_per_pixel, alphaSize, alphaUsage, alphaPosition, premultiplied, typeInterpretation, byteOrder, yuvLayout);
0
577 alphaPosition,
never executed: return QPixelFormat(QPixelFormat::YUV, 0, 0, 0, 0, bits_per_pixel, alphaSize, alphaUsage, alphaPosition, premultiplied, typeInterpretation, byteOrder, yuvLayout);
0
578 premultiplied,
never executed: return QPixelFormat(QPixelFormat::YUV, 0, 0, 0, 0, bits_per_pixel, alphaSize, alphaUsage, alphaPosition, premultiplied, typeInterpretation, byteOrder, yuvLayout);
0
579 typeInterpretation,
never executed: return QPixelFormat(QPixelFormat::YUV, 0, 0, 0, 0, bits_per_pixel, alphaSize, alphaUsage, alphaPosition, premultiplied, typeInterpretation, byteOrder, yuvLayout);
0
580 byteOrder,
never executed: return QPixelFormat(QPixelFormat::YUV, 0, 0, 0, 0, bits_per_pixel, alphaSize, alphaUsage, alphaPosition, premultiplied, typeInterpretation, byteOrder, yuvLayout);
0
581 yuvLayout);
never executed: return QPixelFormat(QPixelFormat::YUV, 0, 0, 0, 0, bits_per_pixel, alphaSize, alphaUsage, alphaPosition, premultiplied, typeInterpretation, byteOrder, yuvLayout);
0
582 }-
583}-
584-
585QT_END_NAMESPACE-
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