| 357 |
357 |
png_init_io( png_ptr, f );
|
| 358 |
358 |
}
|
| 359 |
359 |
|
| 360 |
|
int compression_level = 0;
|
| 361 |
|
int compression_strategy = Z_RLE;
|
|
360 |
int compression_level = -1; // Invalid value to allow setting 0-9 as valid
|
|
361 |
int compression_strategy = Z_RLE; // Default strategy
|
|
362 |
bool isBilevel = false;
|
| 362 |
363 |
|
| 363 |
364 |
for( size_t i = 0; i < params.size(); i += 2 )
|
| 364 |
365 |
{
|
| 365 |
366 |
if( params[i] == CV_IMWRITE_PNG_COMPRESSION )
|
| 366 |
367 |
{
|
| 367 |
368 |
compression_level = params[i+1];
|
| 368 |
|
compression_level = MIN(MAX(compression_level, 0), MAX_MEM_LEVEL);
|
|
369 |
compression_level = MIN(MAX(compression_level, 0), Z_BEST_COMPRESSION);
|
| 369 |
370 |
}
|
| 370 |
371 |
if( params[i] == CV_IMWRITE_PNG_STRATEGY )
|
| 371 |
372 |
{
|
| 372 |
373 |
compression_strategy = params[i+1];
|
| 373 |
374 |
compression_strategy = MIN(MAX(compression_strategy, 0), Z_FIXED);
|
| 374 |
375 |
}
|
|
376 |
if( params[i] == CV_IMWRITE_PNG_BILEVEL )
|
|
377 |
{
|
|
378 |
isBilevel = params[i+1] != 0;
|
|
379 |
}
|
| 375 |
380 |
}
|
| 376 |
381 |
|
| 377 |
382 |
if( m_buf || f )
|
| 378 |
383 |
{
|
| 379 |
|
if( compression_level > 0 )
|
|
384 |
if( compression_level >= 0 )
|
| 380 |
385 |
{
|
| 381 |
|
png_set_compression_mem_level( png_ptr, compression_level );
|
|
386 |
png_set_compression_level( png_ptr, compression_level );
|
| 382 |
387 |
}
|
| 383 |
388 |
else
|
| 384 |
389 |
{
|
| ... | ... | |
| 389 |
394 |
}
|
| 390 |
395 |
png_set_compression_strategy(png_ptr, compression_strategy);
|
| 391 |
396 |
|
| 392 |
|
png_set_IHDR( png_ptr, info_ptr, width, height, depth == CV_8U ? 8 : 16,
|
|
397 |
png_set_IHDR( png_ptr, info_ptr, width, height, depth == CV_8U ? isBilevel?1:8 : 16,
|
| 393 |
398 |
channels == 1 ? PNG_COLOR_TYPE_GRAY :
|
| 394 |
399 |
channels == 3 ? PNG_COLOR_TYPE_RGB : PNG_COLOR_TYPE_RGBA,
|
| 395 |
400 |
PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT,
|
| ... | ... | |
| 397 |
402 |
|
| 398 |
403 |
png_write_info( png_ptr, info_ptr );
|
| 399 |
404 |
|
|
405 |
if (isBilevel)
|
|
406 |
png_set_packing(png_ptr);
|
|
407 |
|
| 400 |
408 |
png_set_bgr( png_ptr );
|
| 401 |
409 |
if( !isBigEndian() )
|
| 402 |
410 |
png_set_swap( png_ptr );
|