2 Copyright (C) 2012-2015 Carl Hetherington <cth@carlh.net>
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 /** @file src/image.cc
21 * @brief A class to describe a video image.
25 #include "exceptions.h"
29 #include "md5_digester.h"
30 #include "dcpomatic_socket.h"
32 #include <libswscale/swscale.h>
33 #include <libavutil/pixfmt.h>
34 #include <libavutil/pixdesc.h>
35 #include <libavutil/frame.h>
46 using std::runtime_error;
47 using boost::shared_ptr;
51 Image::line_factor (int n) const
57 AVPixFmtDescriptor const * d = av_pix_fmt_desc_get(_pixel_format);
59 throw PixelFormatError ("line_factor()", _pixel_format);
62 return pow (2.0f, d->log2_chroma_h);
65 /** @param n Component index.
66 * @return Number of samples (i.e. pixels, unless sub-sampled) in each direction for this component.
69 Image::sample_size (int n) const
71 int horizontal_factor = 1;
73 AVPixFmtDescriptor const * d = av_pix_fmt_desc_get (_pixel_format);
75 throw PixelFormatError ("sample_size()", _pixel_format);
77 horizontal_factor = pow (2.0f, d->log2_chroma_w);
81 lrint (ceil (static_cast<double>(size().width) / horizontal_factor)),
82 lrint (ceil (static_cast<double>(size().height) / line_factor (n)))
87 Image::components () const
89 AVPixFmtDescriptor const * d = av_pix_fmt_desc_get(_pixel_format);
91 throw PixelFormatError ("components()", _pixel_format);
94 return d->nb_components;
97 /** @return Number of planes */
99 Image::planes () const
101 AVPixFmtDescriptor const * d = av_pix_fmt_desc_get(_pixel_format);
103 throw PixelFormatError ("planes()", _pixel_format);
106 if ((d->flags & AV_PIX_FMT_FLAG_PLANAR) == 0) {
110 return d->nb_components;
113 /** Crop this image, scale it to `inter_size' and then place it in a black frame of `out_size' */
115 Image::crop_scale_window (
116 Crop crop, dcp::Size inter_size, dcp::Size out_size, dcp::YUVToRGB yuv_to_rgb, AVPixelFormat out_format, bool out_aligned
119 /* Empirical testing suggests that sws_scale() will crash if
120 the input image is not aligned.
122 DCPOMATIC_ASSERT (aligned ());
124 DCPOMATIC_ASSERT (out_size.width >= inter_size.width);
125 DCPOMATIC_ASSERT (out_size.height >= inter_size.height);
127 /* Here's an image of out_size. Below we may write to it starting at an offset so we get some padding.
128 Hence we want to write in the following pattern:
130 block start write start line end
131 |..(padding)..|<------line-size------------->|..(padding)..|
132 |..(padding)..|<------line-size------------->|..(padding)..|
133 |..(padding)..|<------line-size------------->|..(padding)..|
135 where line-size is of the smaller (inter_size) image and the full padded line length is that of
136 out_size. To get things to work we have to tell FFmpeg that the stride is that of out_size.
137 However some parts of FFmpeg (notably rgb48Toxyz12 in swscale.c) process data for the full
138 specified *stride*. This does not matter until we get to the last line:
140 block start write start line end
141 |..(padding)..|<------line-size------------->|XXXwrittenXXX|
142 |XXXwrittenXXX|<------line-size------------->|XXXwrittenXXX|
143 |XXXwrittenXXX|<------line-size------------->|XXXwrittenXXXXXXwrittenXXX
146 To get around this, we ask Image to overallocate its buffers by the overrun.
149 shared_ptr<Image> out (new Image (out_format, out_size, out_aligned, (out_size.width - inter_size.width) / 2));
152 /* Size of the image after any crop */
153 dcp::Size const cropped_size = crop.apply (size ());
155 /* Scale context for a scale from cropped_size to inter_size */
156 struct SwsContext* scale_context = sws_getContext (
157 cropped_size.width, cropped_size.height, pixel_format(),
158 inter_size.width, inter_size.height, out_format,
162 if (!scale_context) {
163 throw runtime_error (N_("Could not allocate SwsContext"));
166 DCPOMATIC_ASSERT (yuv_to_rgb < dcp::YUV_TO_RGB_COUNT);
167 int const lut[dcp::YUV_TO_RGB_COUNT] = {
172 sws_setColorspaceDetails (
174 sws_getCoefficients (lut[yuv_to_rgb]), 0,
175 sws_getCoefficients (lut[yuv_to_rgb]), 0,
179 AVPixFmtDescriptor const * desc = av_pix_fmt_desc_get (_pixel_format);
181 throw PixelFormatError ("crop_scale_window()", _pixel_format);
184 /* Prepare input data pointers with crop */
185 uint8_t* scale_in_data[planes()];
186 for (int c = 0; c < planes(); ++c) {
187 /* To work out the crop in bytes, start by multiplying
188 the crop by the (average) bytes per pixel. Then
189 round down so that we don't crop a subsampled pixel until
190 we've cropped all of its Y-channel pixels.
192 int const x = lrintf (bytes_per_pixel(c) * crop.left) & ~ ((int) desc->log2_chroma_w);
193 scale_in_data[c] = data()[c] + x + stride()[c] * (crop.top / line_factor(c));
196 /* Corner of the image within out_size */
197 Position<int> const corner ((out_size.width - inter_size.width) / 2, (out_size.height - inter_size.height) / 2);
199 uint8_t* scale_out_data[out->planes()];
200 for (int c = 0; c < out->planes(); ++c) {
201 scale_out_data[c] = out->data()[c] + lrintf (out->bytes_per_pixel(c) * corner.x) + out->stride()[c] * corner.y;
206 scale_in_data, stride(),
207 0, cropped_size.height,
208 scale_out_data, out->stride()
211 sws_freeContext (scale_context);
217 Image::scale (dcp::Size out_size, dcp::YUVToRGB yuv_to_rgb, AVPixelFormat out_format, bool out_aligned) const
219 /* Empirical testing suggests that sws_scale() will crash if
220 the input image is not aligned.
222 DCPOMATIC_ASSERT (aligned ());
224 shared_ptr<Image> scaled (new Image (out_format, out_size, out_aligned));
226 struct SwsContext* scale_context = sws_getContext (
227 size().width, size().height, pixel_format(),
228 out_size.width, out_size.height, out_format,
232 DCPOMATIC_ASSERT (yuv_to_rgb < dcp::YUV_TO_RGB_COUNT);
233 int const lut[dcp::YUV_TO_RGB_COUNT] = {
238 sws_setColorspaceDetails (
240 sws_getCoefficients (lut[yuv_to_rgb]), 0,
241 sws_getCoefficients (lut[yuv_to_rgb]), 0,
249 scaled->data(), scaled->stride()
252 sws_freeContext (scale_context);
257 /** Blacken a YUV image whose bits per pixel is rounded up to 16 */
259 Image::yuv_16_black (uint16_t v, bool alpha)
261 memset (data()[0], 0, sample_size(0).height * stride()[0]);
262 for (int i = 1; i < 3; ++i) {
263 int16_t* p = reinterpret_cast<int16_t*> (data()[i]);
264 int const lines = sample_size(i).height;
265 for (int y = 0; y < lines; ++y) {
266 /* We divide by 2 here because we are writing 2 bytes at a time */
267 for (int x = 0; x < line_size()[i] / 2; ++x) {
270 p += stride()[i] / 2;
275 memset (data()[3], 0, sample_size(3).height * stride()[3]);
280 Image::swap_16 (uint16_t v)
282 return ((v >> 8) & 0xff) | ((v & 0xff) << 8);
288 /* U/V black value for 8-bit colour */
289 static uint8_t const eight_bit_uv = (1 << 7) - 1;
290 /* U/V black value for 9-bit colour */
291 static uint16_t const nine_bit_uv = (1 << 8) - 1;
292 /* U/V black value for 10-bit colour */
293 static uint16_t const ten_bit_uv = (1 << 9) - 1;
294 /* U/V black value for 16-bit colour */
295 static uint16_t const sixteen_bit_uv = (1 << 15) - 1;
297 switch (_pixel_format) {
298 case AV_PIX_FMT_YUV420P:
299 case AV_PIX_FMT_YUV422P:
300 case AV_PIX_FMT_YUV444P:
301 case AV_PIX_FMT_YUV411P:
302 memset (data()[0], 0, sample_size(0).height * stride()[0]);
303 memset (data()[1], eight_bit_uv, sample_size(1).height * stride()[1]);
304 memset (data()[2], eight_bit_uv, sample_size(2).height * stride()[2]);
307 case AV_PIX_FMT_YUVJ420P:
308 case AV_PIX_FMT_YUVJ422P:
309 case AV_PIX_FMT_YUVJ444P:
310 memset (data()[0], 0, sample_size(0).height * stride()[0]);
311 memset (data()[1], eight_bit_uv + 1, sample_size(1).height * stride()[1]);
312 memset (data()[2], eight_bit_uv + 1, sample_size(2).height * stride()[2]);
315 case AV_PIX_FMT_YUV422P9LE:
316 case AV_PIX_FMT_YUV444P9LE:
317 yuv_16_black (nine_bit_uv, false);
320 case AV_PIX_FMT_YUV422P9BE:
321 case AV_PIX_FMT_YUV444P9BE:
322 yuv_16_black (swap_16 (nine_bit_uv), false);
325 case AV_PIX_FMT_YUV422P10LE:
326 case AV_PIX_FMT_YUV444P10LE:
327 yuv_16_black (ten_bit_uv, false);
330 case AV_PIX_FMT_YUV422P16LE:
331 case AV_PIX_FMT_YUV444P16LE:
332 yuv_16_black (sixteen_bit_uv, false);
335 case AV_PIX_FMT_YUV444P10BE:
336 case AV_PIX_FMT_YUV422P10BE:
337 yuv_16_black (swap_16 (ten_bit_uv), false);
340 case AV_PIX_FMT_YUVA420P9BE:
341 case AV_PIX_FMT_YUVA422P9BE:
342 case AV_PIX_FMT_YUVA444P9BE:
343 yuv_16_black (swap_16 (nine_bit_uv), true);
346 case AV_PIX_FMT_YUVA420P9LE:
347 case AV_PIX_FMT_YUVA422P9LE:
348 case AV_PIX_FMT_YUVA444P9LE:
349 yuv_16_black (nine_bit_uv, true);
352 case AV_PIX_FMT_YUVA420P10BE:
353 case AV_PIX_FMT_YUVA422P10BE:
354 case AV_PIX_FMT_YUVA444P10BE:
355 yuv_16_black (swap_16 (ten_bit_uv), true);
358 case AV_PIX_FMT_YUVA420P10LE:
359 case AV_PIX_FMT_YUVA422P10LE:
360 case AV_PIX_FMT_YUVA444P10LE:
361 yuv_16_black (ten_bit_uv, true);
364 case AV_PIX_FMT_YUVA420P16BE:
365 case AV_PIX_FMT_YUVA422P16BE:
366 case AV_PIX_FMT_YUVA444P16BE:
367 yuv_16_black (swap_16 (sixteen_bit_uv), true);
370 case AV_PIX_FMT_YUVA420P16LE:
371 case AV_PIX_FMT_YUVA422P16LE:
372 case AV_PIX_FMT_YUVA444P16LE:
373 yuv_16_black (sixteen_bit_uv, true);
376 case AV_PIX_FMT_RGB24:
377 case AV_PIX_FMT_ARGB:
378 case AV_PIX_FMT_RGBA:
379 case AV_PIX_FMT_ABGR:
380 case AV_PIX_FMT_BGRA:
381 case AV_PIX_FMT_RGB555LE:
382 case AV_PIX_FMT_RGB48LE:
383 case AV_PIX_FMT_RGB48BE:
384 case AV_PIX_FMT_XYZ12LE:
385 memset (data()[0], 0, sample_size(0).height * stride()[0]);
388 case AV_PIX_FMT_UYVY422:
390 int const Y = sample_size(0).height;
391 int const X = line_size()[0];
392 uint8_t* p = data()[0];
393 for (int y = 0; y < Y; ++y) {
394 for (int x = 0; x < X / 4; ++x) {
395 *p++ = eight_bit_uv; // Cb
397 *p++ = eight_bit_uv; // Cr
405 throw PixelFormatError ("make_black()", _pixel_format);
410 Image::make_transparent ()
412 if (_pixel_format != AV_PIX_FMT_RGBA) {
413 throw PixelFormatError ("make_transparent()", _pixel_format);
416 memset (data()[0], 0, sample_size(0).height * stride()[0]);
420 Image::alpha_blend (shared_ptr<const Image> other, Position<int> position)
422 DCPOMATIC_ASSERT (other->pixel_format() == AV_PIX_FMT_RGBA);
423 int const other_bpp = 4;
425 int start_tx = position.x;
429 start_ox = -start_tx;
433 int start_ty = position.y;
437 start_oy = -start_ty;
441 switch (_pixel_format) {
442 case AV_PIX_FMT_RGB24:
444 int const this_bpp = 3;
445 for (int ty = start_ty, oy = start_oy; ty < size().height && oy < other->size().height; ++ty, ++oy) {
446 uint8_t* tp = data()[0] + ty * stride()[0] + start_tx * this_bpp;
447 uint8_t* op = other->data()[0] + oy * other->stride()[0];
448 for (int tx = start_tx, ox = start_ox; tx < size().width && ox < other->size().width; ++tx, ++ox) {
449 float const alpha = float (op[3]) / 255;
450 tp[0] = op[0] * alpha + tp[0] * (1 - alpha);
451 tp[1] = op[1] * alpha + tp[1] * (1 - alpha);
452 tp[2] = op[2] * alpha + tp[2] * (1 - alpha);
460 case AV_PIX_FMT_BGRA:
461 case AV_PIX_FMT_RGBA:
463 int const this_bpp = 4;
464 for (int ty = start_ty, oy = start_oy; ty < size().height && oy < other->size().height; ++ty, ++oy) {
465 uint8_t* tp = data()[0] + ty * stride()[0] + start_tx * this_bpp;
466 uint8_t* op = other->data()[0] + oy * other->stride()[0];
467 for (int tx = start_tx, ox = start_ox; tx < size().width && ox < other->size().width; ++tx, ++ox) {
468 float const alpha = float (op[3]) / 255;
469 tp[0] = op[0] * alpha + tp[0] * (1 - alpha);
470 tp[1] = op[1] * alpha + tp[1] * (1 - alpha);
471 tp[2] = op[2] * alpha + tp[2] * (1 - alpha);
472 tp[3] = op[3] * alpha + tp[3] * (1 - alpha);
480 case AV_PIX_FMT_RGB48LE:
482 int const this_bpp = 6;
483 for (int ty = start_ty, oy = start_oy; ty < size().height && oy < other->size().height; ++ty, ++oy) {
484 uint8_t* tp = data()[0] + ty * stride()[0] + start_tx * this_bpp;
485 uint8_t* op = other->data()[0] + oy * other->stride()[0];
486 for (int tx = start_tx, ox = start_ox; tx < size().width && ox < other->size().width; ++tx, ++ox) {
487 float const alpha = float (op[3]) / 255;
488 /* Blend high bytes; the RGBA in op appears to be BGRA */
489 tp[1] = op[2] * alpha + tp[1] * (1 - alpha);
490 tp[3] = op[1] * alpha + tp[3] * (1 - alpha);
491 tp[5] = op[0] * alpha + tp[5] * (1 - alpha);
499 case AV_PIX_FMT_XYZ12LE:
501 boost::numeric::ublas::matrix<double> matrix = dcp::ColourConversion::srgb_to_xyz().rgb_to_xyz();
502 int const this_bpp = 6;
503 for (int ty = start_ty, oy = start_oy; ty < size().height && oy < other->size().height; ++ty, ++oy) {
504 uint8_t* tp = data()[0] + ty * stride()[0] + start_tx * this_bpp;
505 uint8_t* op = other->data()[0] + oy * other->stride()[0];
506 for (int tx = start_tx, ox = start_ox; tx < size().width && ox < other->size().width; ++tx, ++ox) {
507 float const alpha = float (op[3]) / 255;
509 /* Convert sRGB to XYZ; op is BGRA */
510 int const x = matrix(0, 0) * op[2] + matrix(0, 1) * op[1] + matrix(0, 2) * op[0];
511 int const y = matrix(1, 0) * op[2] + matrix(1, 1) * op[1] + matrix(1, 2) * op[0];
512 int const z = matrix(2, 0) * op[2] + matrix(2, 1) * op[1] + matrix(2, 2) * op[0];
514 /* Blend high bytes */
515 tp[1] = min (x, 255) * alpha + tp[1] * (1 - alpha);
516 tp[3] = min (y, 255) * alpha + tp[3] * (1 - alpha);
517 tp[5] = min (z, 255) * alpha + tp[5] * (1 - alpha);
526 DCPOMATIC_ASSERT (false);
531 Image::copy (shared_ptr<const Image> other, Position<int> position)
533 /* Only implemented for RGB24 onto RGB24 so far */
534 DCPOMATIC_ASSERT (_pixel_format == AV_PIX_FMT_RGB24 && other->pixel_format() == AV_PIX_FMT_RGB24);
535 DCPOMATIC_ASSERT (position.x >= 0 && position.y >= 0);
537 int const N = min (position.x + other->size().width, size().width) - position.x;
538 for (int ty = position.y, oy = 0; ty < size().height && oy < other->size().height; ++ty, ++oy) {
539 uint8_t * const tp = data()[0] + ty * stride()[0] + position.x * 3;
540 uint8_t * const op = other->data()[0] + oy * other->stride()[0];
541 memcpy (tp, op, N * 3);
546 Image::read_from_socket (shared_ptr<Socket> socket)
548 for (int i = 0; i < planes(); ++i) {
549 uint8_t* p = data()[i];
550 int const lines = sample_size(i).height;
551 for (int y = 0; y < lines; ++y) {
552 socket->read (p, line_size()[i]);
559 Image::write_to_socket (shared_ptr<Socket> socket) const
561 for (int i = 0; i < planes(); ++i) {
562 uint8_t* p = data()[i];
563 int const lines = sample_size(i).height;
564 for (int y = 0; y < lines; ++y) {
565 socket->write (p, line_size()[i]);
572 Image::bytes_per_pixel (int c) const
574 AVPixFmtDescriptor const * d = av_pix_fmt_desc_get(_pixel_format);
576 throw PixelFormatError ("bytes_per_pixel()", _pixel_format);
583 float bpp[4] = { 0, 0, 0, 0 };
585 #ifdef DCPOMATIC_HAVE_AVCOMPONENTDESCRIPTOR_DEPTH_MINUS1
586 bpp[0] = floor ((d->comp[0].depth_minus1 + 8) / 8);
587 if (d->nb_components > 1) {
588 bpp[1] = floor ((d->comp[1].depth_minus1 + 8) / 8) / pow (2.0f, d->log2_chroma_w);
590 if (d->nb_components > 2) {
591 bpp[2] = floor ((d->comp[2].depth_minus1 + 8) / 8) / pow (2.0f, d->log2_chroma_w);
593 if (d->nb_components > 3) {
594 bpp[3] = floor ((d->comp[3].depth_minus1 + 8) / 8) / pow (2.0f, d->log2_chroma_w);
597 bpp[0] = floor ((d->comp[0].depth + 7) / 8);
598 if (d->nb_components > 1) {
599 bpp[1] = floor ((d->comp[1].depth + 7) / 8) / pow (2.0f, d->log2_chroma_w);
601 if (d->nb_components > 2) {
602 bpp[2] = floor ((d->comp[2].depth + 7) / 8) / pow (2.0f, d->log2_chroma_w);
604 if (d->nb_components > 3) {
605 bpp[3] = floor ((d->comp[3].depth + 7) / 8) / pow (2.0f, d->log2_chroma_w);
609 if ((d->flags & AV_PIX_FMT_FLAG_PLANAR) == 0) {
610 /* Not planar; sum them up */
611 return bpp[0] + bpp[1] + bpp[2] + bpp[3];
617 /** Construct a Image of a given size and format, allocating memory
620 * @param p Pixel format.
621 * @param s Size in pixels.
622 * @param extra_pixels Amount of extra "run-off" memory to allocate at the end of each plane in pixels.
624 Image::Image (AVPixelFormat p, dcp::Size s, bool aligned, int extra_pixels)
628 , _extra_pixels (extra_pixels)
636 _data = (uint8_t **) wrapped_av_malloc (4 * sizeof (uint8_t *));
637 _data[0] = _data[1] = _data[2] = _data[3] = 0;
639 _line_size = (int *) wrapped_av_malloc (4 * sizeof (int));
640 _line_size[0] = _line_size[1] = _line_size[2] = _line_size[3] = 0;
642 _stride = (int *) wrapped_av_malloc (4 * sizeof (int));
643 _stride[0] = _stride[1] = _stride[2] = _stride[3] = 0;
645 for (int i = 0; i < planes(); ++i) {
646 _line_size[i] = ceil (_size.width * bytes_per_pixel(i));
647 _stride[i] = stride_round_up (i, _line_size, _aligned ? 32 : 1);
649 /* The assembler function ff_rgb24ToY_avx (in libswscale/x86/input.asm)
650 uses a 16-byte fetch to read three bytes (R/G/B) of image data.
651 Hence on the last pixel of the last line it reads over the end of
652 the actual data by 1 byte. If the width of an image is a multiple
653 of the stride alignment there will be no padding at the end of image lines.
654 OS X crashes on this illegal read, though other operating systems don't
655 seem to mind. The nasty + 1 in this malloc makes sure there is always a byte
656 for that instruction to read safely.
658 Further to the above, valgrind is now telling me that ff_rgb24ToY_ssse3
659 over-reads by more then _avx. I can't follow the code to work out how much,
660 so I'll just over-allocate by 32 bytes and have done with it. Empirical
661 testing suggests that it works.
663 _data[i] = (uint8_t *) wrapped_av_malloc (_stride[i] * sample_size(i).height + _extra_pixels * bytes_per_pixel(i) + 32);
667 Image::Image (Image const & other)
668 : _size (other._size)
669 , _pixel_format (other._pixel_format)
670 , _aligned (other._aligned)
671 , _extra_pixels (other._extra_pixels)
675 for (int i = 0; i < planes(); ++i) {
676 uint8_t* p = _data[i];
677 uint8_t* q = other._data[i];
678 int const lines = sample_size(i).height;
679 for (int j = 0; j < lines; ++j) {
680 memcpy (p, q, _line_size[i]);
682 q += other.stride()[i];
687 Image::Image (AVFrame* frame)
688 : _size (frame->width, frame->height)
689 , _pixel_format (static_cast<AVPixelFormat> (frame->format))
695 for (int i = 0; i < planes(); ++i) {
696 uint8_t* p = _data[i];
697 uint8_t* q = frame->data[i];
698 int const lines = sample_size(i).height;
699 for (int j = 0; j < lines; ++j) {
700 memcpy (p, q, _line_size[i]);
702 /* AVFrame's linesize is what we call `stride' */
703 q += frame->linesize[i];
708 Image::Image (shared_ptr<const Image> other, bool aligned)
709 : _size (other->_size)
710 , _pixel_format (other->_pixel_format)
712 , _extra_pixels (other->_extra_pixels)
716 for (int i = 0; i < planes(); ++i) {
717 DCPOMATIC_ASSERT (line_size()[i] == other->line_size()[i]);
718 uint8_t* p = _data[i];
719 uint8_t* q = other->data()[i];
720 int const lines = sample_size(i).height;
721 for (int j = 0; j < lines; ++j) {
722 memcpy (p, q, line_size()[i]);
724 q += other->stride()[i];
730 Image::operator= (Image const & other)
732 if (this == &other) {
742 Image::swap (Image & other)
744 std::swap (_size, other._size);
745 std::swap (_pixel_format, other._pixel_format);
747 for (int i = 0; i < 4; ++i) {
748 std::swap (_data[i], other._data[i]);
749 std::swap (_line_size[i], other._line_size[i]);
750 std::swap (_stride[i], other._stride[i]);
753 std::swap (_aligned, other._aligned);
756 /** Destroy a Image */
759 for (int i = 0; i < planes(); ++i) {
764 av_free (_line_size);
775 Image::line_size () const
781 Image::stride () const
793 Image::aligned () const
799 merge (list<PositionImage> images)
801 if (images.empty ()) {
802 return PositionImage ();
805 if (images.size() == 1) {
806 return images.front ();
809 dcpomatic::Rect<int> all (images.front().position, images.front().image->size().width, images.front().image->size().height);
810 for (list<PositionImage>::const_iterator i = images.begin(); i != images.end(); ++i) {
811 all.extend (dcpomatic::Rect<int> (i->position, i->image->size().width, i->image->size().height));
814 shared_ptr<Image> merged (new Image (images.front().image->pixel_format (), dcp::Size (all.width, all.height), true));
815 merged->make_transparent ();
816 for (list<PositionImage>::const_iterator i = images.begin(); i != images.end(); ++i) {
817 merged->alpha_blend (i->image, i->position - all.position());
820 return PositionImage (merged, all.position ());
824 operator== (Image const & a, Image const & b)
826 if (a.planes() != b.planes() || a.pixel_format() != b.pixel_format() || a.aligned() != b.aligned()) {
830 for (int c = 0; c < a.planes(); ++c) {
831 if (a.sample_size(c).height != b.sample_size(c).height || a.line_size()[c] != b.line_size()[c] || a.stride()[c] != b.stride()[c]) {
835 uint8_t* p = a.data()[c];
836 uint8_t* q = b.data()[c];
837 int const lines = a.sample_size(c).height;
838 for (int y = 0; y < lines; ++y) {
839 if (memcmp (p, q, a.line_size()[c]) != 0) {
852 * @param f Amount to fade by; 0 is black, 1 is no fade.
855 Image::fade (float f)
857 switch (_pixel_format) {
858 case AV_PIX_FMT_YUV420P:
859 case AV_PIX_FMT_YUV422P:
860 case AV_PIX_FMT_YUV444P:
861 case AV_PIX_FMT_YUV411P:
862 case AV_PIX_FMT_YUVJ420P:
863 case AV_PIX_FMT_YUVJ422P:
864 case AV_PIX_FMT_YUVJ444P:
865 case AV_PIX_FMT_RGB24:
866 case AV_PIX_FMT_ARGB:
867 case AV_PIX_FMT_RGBA:
868 case AV_PIX_FMT_ABGR:
869 case AV_PIX_FMT_BGRA:
870 case AV_PIX_FMT_RGB555LE:
872 for (int c = 0; c < 3; ++c) {
873 uint8_t* p = data()[c];
874 int const lines = sample_size(c).height;
875 for (int y = 0; y < lines; ++y) {
877 for (int x = 0; x < line_size()[c]; ++x) {
878 *q = int (float (*q) * f);
886 case AV_PIX_FMT_YUV422P9LE:
887 case AV_PIX_FMT_YUV444P9LE:
888 case AV_PIX_FMT_YUV422P10LE:
889 case AV_PIX_FMT_YUV444P10LE:
890 case AV_PIX_FMT_YUV422P16LE:
891 case AV_PIX_FMT_YUV444P16LE:
892 case AV_PIX_FMT_YUVA420P9LE:
893 case AV_PIX_FMT_YUVA422P9LE:
894 case AV_PIX_FMT_YUVA444P9LE:
895 case AV_PIX_FMT_YUVA420P10LE:
896 case AV_PIX_FMT_YUVA422P10LE:
897 case AV_PIX_FMT_YUVA444P10LE:
898 case AV_PIX_FMT_RGB48LE:
899 case AV_PIX_FMT_XYZ12LE:
900 /* 16-bit little-endian */
901 for (int c = 0; c < 3; ++c) {
902 int const stride_pixels = stride()[c] / 2;
903 int const line_size_pixels = line_size()[c] / 2;
904 uint16_t* p = reinterpret_cast<uint16_t*> (data()[c]);
905 int const lines = sample_size(c).height;
906 for (int y = 0; y < lines; ++y) {
908 for (int x = 0; x < line_size_pixels; ++x) {
909 *q = int (float (*q) * f);
917 case AV_PIX_FMT_YUV422P9BE:
918 case AV_PIX_FMT_YUV444P9BE:
919 case AV_PIX_FMT_YUV444P10BE:
920 case AV_PIX_FMT_YUV422P10BE:
921 case AV_PIX_FMT_YUVA420P9BE:
922 case AV_PIX_FMT_YUVA422P9BE:
923 case AV_PIX_FMT_YUVA444P9BE:
924 case AV_PIX_FMT_YUVA420P10BE:
925 case AV_PIX_FMT_YUVA422P10BE:
926 case AV_PIX_FMT_YUVA444P10BE:
927 case AV_PIX_FMT_YUVA420P16BE:
928 case AV_PIX_FMT_YUVA422P16BE:
929 case AV_PIX_FMT_YUVA444P16BE:
930 case AV_PIX_FMT_RGB48BE:
931 /* 16-bit big-endian */
932 for (int c = 0; c < 3; ++c) {
933 int const stride_pixels = stride()[c] / 2;
934 int const line_size_pixels = line_size()[c] / 2;
935 uint16_t* p = reinterpret_cast<uint16_t*> (data()[c]);
936 int const lines = sample_size(c).height;
937 for (int y = 0; y < lines; ++y) {
939 for (int x = 0; x < line_size_pixels; ++x) {
940 *q = swap_16 (int (float (swap_16 (*q)) * f));
948 case AV_PIX_FMT_UYVY422:
950 int const Y = sample_size(0).height;
951 int const X = line_size()[0];
952 uint8_t* p = data()[0];
953 for (int y = 0; y < Y; ++y) {
954 for (int x = 0; x < X; ++x) {
955 *p = int (float (*p) * f);
963 throw PixelFormatError ("fade()", _pixel_format);