OLD | NEW |
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1 /* | 1 /* |
2 * Copyright 2015 Google Inc. | 2 * Copyright 2015 Google Inc. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 #include "SkCodec_libpng.h" | 8 #include "SkCodec_libpng.h" |
9 #include "SkCodecPriv.h" | 9 #include "SkCodecPriv.h" |
10 #include "SkColorPriv.h" | 10 #include "SkColorPriv.h" |
(...skipping 196 matching lines...) Expand 10 before | Expand all | Expand 10 after Loading... | |
207 } | 207 } |
208 return true; | 208 return true; |
209 } | 209 } |
210 | 210 |
211 // Reads the header, and initializes the passed in fields, if not NULL (except | 211 // Reads the header, and initializes the passed in fields, if not NULL (except |
212 // stream, which is passed to the read function). | 212 // stream, which is passed to the read function). |
213 // Returns true on success, in which case the caller is responsible for calling | 213 // Returns true on success, in which case the caller is responsible for calling |
214 // png_destroy_read_struct. If it returns false, the passed in fields (except | 214 // png_destroy_read_struct. If it returns false, the passed in fields (except |
215 // stream) are unchanged. | 215 // stream) are unchanged. |
216 static bool read_header(SkStream* stream, png_structp* png_ptrp, | 216 static bool read_header(SkStream* stream, png_structp* png_ptrp, |
217 png_infop* info_ptrp, SkImageInfo* imageInfo) { | 217 png_infop* info_ptrp, SkImageInfo* imageInfo, int bitDep th) { |
scroggo
2015/06/30 15:38:37
I believe you want this to be an int* rather than
emmaleer
2015/06/30 20:13:41
Done.
| |
218 // The image is known to be a PNG. Decode enough to know the SkImageInfo. | 218 // The image is known to be a PNG. Decode enough to know the SkImageInfo. |
219 png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, | 219 png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, |
220 sk_error_fn, sk_warning_fn); | 220 sk_error_fn, sk_warning_fn); |
221 if (!png_ptr) { | 221 if (!png_ptr) { |
222 return false; | 222 return false; |
223 } | 223 } |
224 | 224 |
225 AutoCleanPng autoClean(png_ptr); | 225 AutoCleanPng autoClean(png_ptr); |
226 | 226 |
227 png_infop info_ptr = png_create_info_struct(png_ptr); | 227 png_infop info_ptr = png_create_info_struct(png_ptr); |
(...skipping 13 matching lines...) Expand all Loading... | |
241 | 241 |
242 // FIXME: This is where the old code hooks up the Peeker. Does it need to | 242 // FIXME: This is where the old code hooks up the Peeker. Does it need to |
243 // be set this early? (i.e. where are the user chunks? early in the stream, | 243 // be set this early? (i.e. where are the user chunks? early in the stream, |
244 // potentially?) | 244 // potentially?) |
245 // If it does, we need to figure out a way to set it here. | 245 // If it does, we need to figure out a way to set it here. |
246 | 246 |
247 // The call to png_read_info() gives us all of the information from the | 247 // The call to png_read_info() gives us all of the information from the |
248 // PNG file before the first IDAT (image data chunk). | 248 // PNG file before the first IDAT (image data chunk). |
249 png_read_info(png_ptr, info_ptr); | 249 png_read_info(png_ptr, info_ptr); |
250 png_uint_32 origWidth, origHeight; | 250 png_uint_32 origWidth, origHeight; |
251 int bitDepth, colorType; | 251 int colorType; |
252 png_get_IHDR(png_ptr, info_ptr, &origWidth, &origHeight, &bitDepth, | 252 png_get_IHDR(png_ptr, info_ptr, &origWidth, &origHeight, &bitDepth, |
253 &colorType, int_p_NULL, int_p_NULL, int_p_NULL); | 253 &colorType, int_p_NULL, int_p_NULL, int_p_NULL); |
254 | 254 |
255 // sanity check for size | 255 // sanity check for size |
256 { | 256 { |
257 int64_t size = sk_64_mul(origWidth, origHeight); | 257 int64_t size = sk_64_mul(origWidth, origHeight); |
258 // now check that if we are 4-bytes per pixel, we also don't overflow | 258 // now check that if we are 4-bytes per pixel, we also don't overflow |
259 if (size < 0 || size > (0x7FFFFFFF >> 2)) { | 259 if (size < 0 || size > (0x7FFFFFFF >> 2)) { |
260 return false; | 260 return false; |
261 } | 261 } |
262 } | 262 } |
263 | 263 |
264 // Tell libpng to strip 16 bit/color files down to 8 bits/color | 264 // Tell libpng to strip 16 bit/color files down to 8 bits/color |
265 if (bitDepth == 16) { | 265 if (bitDepth == 16) { |
266 png_set_strip_16(png_ptr); | 266 png_set_strip_16(png_ptr); |
267 } | 267 } |
268 #ifdef PNG_READ_PACK_SUPPORTED | 268 #ifdef PNG_READ_PACK_SUPPORTED |
269 // Extract multiple pixels with bit depths of 1, 2, and 4 from a single | 269 // Extract multiple pixels with bit depths of 1, 2, and 4 from a single |
270 // byte into separate bytes (useful for paletted and grayscale images). | 270 // byte into separate bytes (useful for paletted and grayscale images). |
271 if (bitDepth < 8) { | 271 if (bitDepth < 8) { |
272 png_set_packing(png_ptr); | 272 png_set_packing(png_ptr); |
273 } | 273 } |
274 #endif | 274 #endif |
275 // Expand grayscale images to the full 8 bits from 1, 2, or 4 bits/pixel. | 275 // Expand grayscale images to the full 8 bits from 1, 2, or 4 bits/pixel. |
276 if (colorType == PNG_COLOR_TYPE_GRAY && bitDepth < 8) { | 276 if (colorType == PNG_COLOR_TYPE_GRAY && bitDepth < 8) { |
277 png_set_expand_gray_1_2_4_to_8(png_ptr); | 277 png_set_expand_gray_1_2_4_to_8(png_ptr); |
278 } | 278 } |
279 | 279 |
280 | 280 // Now determine the default SkColorType and SkAlphaType and set required tr ansforms |
281 // Now determine the default SkColorType and SkAlphaType. | |
282 SkColorType skColorType; | 281 SkColorType skColorType; |
283 SkAlphaType skAlphaType; | 282 SkAlphaType skAlphaType; |
284 switch (colorType) { | 283 switch (colorType) { |
285 case PNG_COLOR_TYPE_PALETTE: | 284 case PNG_COLOR_TYPE_PALETTE: |
286 skColorType = kIndex_8_SkColorType; | 285 skColorType = kIndex_8_SkColorType; |
287 skAlphaType = has_transparency_in_palette(png_ptr, info_ptr) ? | 286 skAlphaType = has_transparency_in_palette(png_ptr, info_ptr) ? |
288 kUnpremul_SkAlphaType : kOpaque_SkAlphaType; | 287 kUnpremul_SkAlphaType : kOpaque_SkAlphaType; |
289 break; | 288 break; |
289 case PNG_COLOR_TYPE_RGB: | |
290 if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)) { | |
scroggo
2015/06/30 15:38:38
In other places, we also check to see whether the
emmaleer
2015/06/30 20:13:40
Yes, I think it's important to make that check. I'
| |
291 //convert to RGBA with tranparency information in tRNS chunk if it exists | |
292 png_set_tRNS_to_alpha(png_ptr); | |
293 skAlphaType = kUnpremul_SkAlphaType; | |
294 } else { | |
295 //convert to RGBA with Opaque Alpha | |
296 png_set_filler(png_ptr, 0xff, PNG_FILLER_AFTER); | |
297 skAlphaType = kOpaque_SkAlphaType; | |
298 } | |
299 skColorType = kRGBA_8888_SkColorType; | |
scroggo
2015/06/30 15:38:38
Interesting. I assume you chose RGBA because that
emmaleer
2015/06/30 20:13:40
Changed to N32
| |
300 break; | |
290 case PNG_COLOR_TYPE_GRAY: | 301 case PNG_COLOR_TYPE_GRAY: |
291 if (false) { | 302 if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)) { |
292 // FIXME: Is this the wrong default behavior? This means if the | 303 //convert to RGBA if there is transparency information in the tR NS chunk |
scroggo
2015/06/30 15:38:37
Maybe this should be a FIXME; if we supported gray
emmaleer
2015/06/30 20:13:41
Acknowledged.
| |
293 // caller supplies the info we gave them, they'll get Alpha 8. | 304 png_set_tRNS_to_alpha(png_ptr); |
294 skColorType = kAlpha_8_SkColorType; | 305 png_set_gray_to_rgb(png_ptr); |
295 // FIXME: Strangely, the canonical type for Alpha 8 is Premul. | 306 skColorType = kRGBA_8888_SkColorType; |
296 skAlphaType = kPremul_SkAlphaType; | 307 skAlphaType = kUnpremul_SkAlphaType; |
297 } else { | 308 } else { |
298 skColorType = kN32_SkColorType; | 309 skColorType = kGray_8_SkColorType; |
299 skAlphaType = kOpaque_SkAlphaType; | 310 skAlphaType = kOpaque_SkAlphaType; |
300 } | 311 } |
301 break; | 312 break; |
313 case PNG_COLOR_TYPE_GRAY_ALPHA: | |
314 //convert to RGBA as GreyAlpha is not a Skia color type | |
scroggo
2015/06/30 15:38:37
Maybe add a similar FIXME here.
(Also nit: I don'
emmaleer
2015/06/30 20:13:41
Acknowledged.
| |
315 png_set_gray_to_rgb(png_ptr); | |
scroggo
2015/06/30 15:38:38
Do we need to also call png_set_tRNS_to_alpha here
emmaleer
2015/06/30 20:13:41
No, as PNG_COLOR_TYPE_GRAY_ALPHA has an alpha chan
| |
316 skColorType = kRGBA_8888_SkColorType; | |
317 skAlphaType = kUnpremul_SkAlphaType; | |
318 break; | |
302 default: | 319 default: |
303 // Note: This *almost* mimics the code in SkImageDecoder_libpng. | 320 //colorType = PNG_COLOR_TYPE_RGBA |
scroggo
2015/06/30 15:38:37
Is this the only colorType left? (If so, I think i
emmaleer
2015/06/30 20:13:41
Yes, this is the last color type. Okay, I have don
| |
304 // has_transparency_in_palette makes an additional check - whether | 321 skColorType = kRGBA_8888_SkColorType; |
305 // numTrans is greater than 0. Why does the other code not make that | 322 skAlphaType = kUnpremul_SkAlphaType; |
306 // check? | |
307 if (has_transparency_in_palette(png_ptr, info_ptr) | |
308 || PNG_COLOR_TYPE_RGB_ALPHA == colorType | |
309 || PNG_COLOR_TYPE_GRAY_ALPHA == colorType) | |
310 { | |
311 skAlphaType = kUnpremul_SkAlphaType; | |
312 } else { | |
313 skAlphaType = kOpaque_SkAlphaType; | |
314 } | |
315 skColorType = kN32_SkColorType; | |
316 break; | 323 break; |
317 } | 324 } |
318 | 325 |
319 { | |
320 // FIXME: Again, this block needs to go into onGetPixels. | |
321 bool convertGrayToRGB = PNG_COLOR_TYPE_GRAY == colorType && skColorType != kAlpha_8_SkColorType; | |
322 | |
323 // Unless the user is requesting A8, convert a grayscale image into RGB. | |
324 // GRAY_ALPHA will always be converted to RGB | |
325 if (convertGrayToRGB || colorType == PNG_COLOR_TYPE_GRAY_ALPHA) { | |
326 png_set_gray_to_rgb(png_ptr); | |
327 } | |
328 | |
329 // Add filler (or alpha) byte (after each RGB triplet) if necessary. | |
330 // FIXME: It seems like we could just use RGB as the SrcConfig here. | |
331 if (colorType == PNG_COLOR_TYPE_RGB || convertGrayToRGB) { | |
332 png_set_filler(png_ptr, 0xff, PNG_FILLER_AFTER); | |
333 } | |
334 } | |
335 | |
336 // FIXME: Also need to check for sRGB (skbug.com/3471). | 326 // FIXME: Also need to check for sRGB (skbug.com/3471). |
337 | 327 |
338 if (imageInfo) { | 328 if (imageInfo) { |
339 *imageInfo = SkImageInfo::Make(origWidth, origHeight, skColorType, | 329 *imageInfo = SkImageInfo::Make(origWidth, origHeight, skColorType, skAlp haType); |
340 skAlphaType); | |
341 } | 330 } |
342 autoClean.detach(); | 331 autoClean.detach(); |
343 if (png_ptrp) { | 332 if (png_ptrp) { |
344 *png_ptrp = png_ptr; | 333 *png_ptrp = png_ptr; |
345 } | 334 } |
346 if (info_ptrp) { | 335 if (info_ptrp) { |
347 *info_ptrp = info_ptr; | 336 *info_ptrp = info_ptr; |
348 } | 337 } |
349 return true; | 338 return true; |
350 } | 339 } |
351 | 340 |
352 SkCodec* SkPngCodec::NewFromStream(SkStream* stream) { | 341 SkCodec* SkPngCodec::NewFromStream(SkStream* stream) { |
353 SkAutoTDelete<SkStream> streamDeleter(stream); | 342 SkAutoTDelete<SkStream> streamDeleter(stream); |
354 png_structp png_ptr; | 343 png_structp png_ptr; |
355 png_infop info_ptr; | 344 png_infop info_ptr; |
356 SkImageInfo imageInfo; | 345 SkImageInfo imageInfo; |
357 if (read_header(stream, &png_ptr, &info_ptr, &imageInfo)) { | 346 int bitDepth; |
358 return SkNEW_ARGS(SkPngCodec, (imageInfo, streamDeleter.detach(), png_pt r, info_ptr)); | 347 if (read_header(stream, &png_ptr, &info_ptr, &imageInfo, bitDepth)) { |
scroggo
2015/06/30 15:38:38
Since the function takes an int, this does not mod
emmaleer
2015/06/30 20:13:41
Acknowledged.
| |
348 return SkNEW_ARGS(SkPngCodec, (imageInfo, streamDeleter.detach(), | |
349 png_ptr, info_ptr, bitDepth)); | |
359 } | 350 } |
360 return NULL; | 351 return NULL; |
361 } | 352 } |
362 | 353 |
363 #define INVALID_NUMBER_PASSES -1 | 354 #define INVALID_NUMBER_PASSES -1 |
364 SkPngCodec::SkPngCodec(const SkImageInfo& info, SkStream* stream, | 355 SkPngCodec::SkPngCodec(const SkImageInfo& info, SkStream* stream, |
365 png_structp png_ptr, png_infop info_ptr) | 356 png_structp png_ptr, png_infop info_ptr, int bitDepth) |
366 : INHERITED(info, stream) | 357 : INHERITED(info, stream) |
367 , fPng_ptr(png_ptr) | 358 , fPng_ptr(png_ptr) |
368 , fInfo_ptr(info_ptr) | 359 , fInfo_ptr(info_ptr) |
369 , fSrcConfig(SkSwizzler::kUnknown) | 360 , fSrcConfig(SkSwizzler::kUnknown) |
370 , fNumberPasses(INVALID_NUMBER_PASSES) | 361 , fNumberPasses(INVALID_NUMBER_PASSES) |
371 , fReallyHasAlpha(false) | 362 , fReallyHasAlpha(false) |
363 , fBitDepth(bitDepth) | |
372 {} | 364 {} |
373 | 365 |
374 SkPngCodec::~SkPngCodec() { | 366 SkPngCodec::~SkPngCodec() { |
375 this->destroyReadStruct(); | 367 this->destroyReadStruct(); |
376 } | 368 } |
377 | 369 |
378 void SkPngCodec::destroyReadStruct() { | 370 void SkPngCodec::destroyReadStruct() { |
379 if (fPng_ptr) { | 371 if (fPng_ptr) { |
380 // We will never have a NULL fInfo_ptr with a non-NULL fPng_ptr | 372 // We will never have a NULL fInfo_ptr with a non-NULL fPng_ptr |
381 SkASSERT(fInfo_ptr); | 373 SkASSERT(fInfo_ptr); |
(...skipping 24 matching lines...) Expand all Loading... | |
406 switch (dst.alphaType()) { | 398 switch (dst.alphaType()) { |
407 case kPremul_SkAlphaType: | 399 case kPremul_SkAlphaType: |
408 case kUnpremul_SkAlphaType: | 400 case kUnpremul_SkAlphaType: |
409 // The source is not opaque, so either of these is okay | 401 // The source is not opaque, so either of these is okay |
410 break; | 402 break; |
411 default: | 403 default: |
412 // We cannot decode a non-opaque image to opaque (or unknown) | 404 // We cannot decode a non-opaque image to opaque (or unknown) |
413 return false; | 405 return false; |
414 } | 406 } |
415 } | 407 } |
416 | |
417 // Check for supported color types | 408 // Check for supported color types |
418 switch (dst.colorType()) { | 409 switch (dst.colorType()) { |
419 // Allow output to kN32 from any type of input | 410 // Allow output to RGBA from any type of input |
reed1
2015/06/30 13:51:01
not sure either of these comments are needed (also
emmaleer
2015/06/30 20:13:40
I removed the unneeded comments
In the enum in SkI
scroggo
2015/06/30 20:50:03
I think Mike's comment about ordering is actually
| |
420 case kN32_SkColorType: | 411 case kRGBA_8888_SkColorType: |
412 return true; | |
413 // Allow output to GBRA from any type of input | |
414 case kBGRA_8888_SkColorType: | |
421 return true; | 415 return true; |
422 default: | 416 default: |
423 return dst.colorType() == src.colorType(); | 417 return dst.colorType() == src.colorType(); |
424 } | 418 } |
425 } | 419 } |
426 | 420 |
427 SkCodec::Result SkPngCodec::initializeSwizzler(const SkImageInfo& requestedInfo, | 421 SkCodec::Result SkPngCodec::initializeSwizzler(const SkImageInfo& requestedInfo, |
428 void* dst, size_t rowBytes, | 422 void* dst, size_t rowBytes, |
429 const Options& options, | 423 const Options& options, |
430 SkPMColor ctable[], | 424 SkPMColor ctable[], |
431 int* ctableCount) { | 425 int* ctableCount) { |
432 // FIXME: Could we use the return value of setjmp to specify the type of | 426 // FIXME: Could we use the return value of setjmp to specify the type of |
433 // error? | 427 // error? |
434 if (setjmp(png_jmpbuf(fPng_ptr))) { | 428 if (setjmp(png_jmpbuf(fPng_ptr))) { |
435 SkCodecPrintf("setjmp long jump!\n"); | 429 SkCodecPrintf("setjmp long jump!\n"); |
436 return kInvalidInput; | 430 return kInvalidInput; |
437 } | 431 } |
438 | 432 |
439 // FIXME: We already retrieved this information. Store it in SkPngCodec? | |
440 png_uint_32 origWidth, origHeight; | |
441 int bitDepth, pngColorType, interlaceType; | |
442 png_get_IHDR(fPng_ptr, fInfo_ptr, &origWidth, &origHeight, &bitDepth, | |
443 &pngColorType, &interlaceType, int_p_NULL, int_p_NULL); | |
444 | |
445 fNumberPasses = (interlaceType != PNG_INTERLACE_NONE) ? | |
446 png_set_interlace_handling(fPng_ptr) : 1; | |
447 | |
448 // Set to the default before calling decodePalette, which may change it. | 433 // Set to the default before calling decodePalette, which may change it. |
449 fReallyHasAlpha = false; | 434 fReallyHasAlpha = false; |
450 if (PNG_COLOR_TYPE_PALETTE == pngColorType) { | 435 |
451 fSrcConfig = SkSwizzler::kIndex; | 436 //srcColorType was determined in readHeader() which determined png color typ e |
452 if (!this->decodePalette(kPremul_SkAlphaType == requestedInfo.alphaType( ), bitDepth, | 437 int srcColorType = this->getInfo().colorType(); |
scroggo
2015/06/30 15:38:37
Why do you store these as ints instead of SkColorT
emmaleer
2015/06/30 20:13:40
Changed to const SkColorType
| |
453 ctableCount)) { | 438 int dstColorType = requestedInfo.colorType(); |
454 return kInvalidInput; | 439 switch (dstColorType) { |
scroggo
2015/06/30 15:38:37
nit: this should line up with the line before it.
emmaleer
2015/06/30 20:13:40
I switch on dstColorType, since libpng will conver
| |
455 } | 440 case kIndex_8_SkColorType: |
456 } else if (kAlpha_8_SkColorType == requestedInfo.colorType()) { | 441 //decode palette to Skia format |
457 // Note: we check the destination, since otherwise we would have | 442 fSrcConfig = SkSwizzler::kIndex; |
458 // told png to upscale. | 443 if (!this->decodePalette(kPremul_SkAlphaType == requestedInfo.alphaT ype(), fBitDepth, |
459 SkASSERT(PNG_COLOR_TYPE_GRAY == pngColorType); | 444 ctableCount)) { |
460 fSrcConfig = SkSwizzler::kGray; | 445 return kInvalidInput; |
461 } else if (this->getInfo().alphaType() == kOpaque_SkAlphaType) { | 446 } |
462 fSrcConfig = SkSwizzler::kRGBX; | 447 break; |
463 } else { | 448 case kGray_8_SkColorType: |
464 fSrcConfig = SkSwizzler::kRGBA; | 449 fSrcConfig = SkSwizzler::kGray; |
465 } | 450 break; |
451 case kRGBA_8888_SkColorType: | |
452 if (this->getInfo().alphaType() == kOpaque_SkAlphaType) { | |
453 fSrcConfig = SkSwizzler::kRGBX; | |
454 } else { | |
455 fSrcConfig = SkSwizzler::kRGBA; | |
456 } | |
457 default: | |
458 //dstColorType == kBGRA_8888_SkColorType | |
459 if (this->getInfo().alphaType() == kOpaque_SkAlphaType) { | |
460 fSrcConfig = SkSwizzler::kBGRX; | |
461 } else { | |
462 fSrcConfig = SkSwizzler::kBGRA; | |
463 } | |
464 } | |
466 | 465 |
467 // Copy the color table to the client if they request kIndex8 mode | 466 // Copy the color table to the client if they request kIndex8 mode |
468 copy_color_table(requestedInfo, fColorTable, ctable, ctableCount); | 467 copy_color_table(requestedInfo, fColorTable, ctable, ctableCount); |
469 | 468 |
470 // Create the swizzler. SkPngCodec retains ownership of the color table. | 469 // Create the swizzler. SkPngCodec retains ownership of the color table. |
471 const SkPMColor* colors = fColorTable ? fColorTable->readColors() : NULL; | 470 const SkPMColor* colors = fColorTable ? fColorTable->readColors() : NULL; |
472 fSwizzler.reset(SkSwizzler::CreateSwizzler(fSrcConfig, colors, requestedInfo , | 471 fSwizzler.reset(SkSwizzler::CreateSwizzler(fSrcConfig, colors, requestedInfo , |
473 dst, rowBytes, options.fZeroInitialized)); | 472 dst, rowBytes, options.fZeroInitialized)); |
474 if (!fSwizzler) { | 473 if (!fSwizzler) { |
475 // FIXME: CreateSwizzler could fail for another reason. | 474 // FIXME: CreateSwizzler could fail for another reason. |
476 return kUnimplemented; | 475 return kUnimplemented; |
477 } | 476 } |
478 | 477 |
479 // FIXME: Here is where we should likely insert some of the modifications | 478 // FIXME: Here is where we should likely insert some of the modifications |
scroggo
2015/06/30 15:38:37
I think this FIXME has been resolved?
emmaleer
2015/06/30 20:13:41
Acknowledged.
| |
480 // made in the factory. | 479 // made in the factory. |
481 png_read_update_info(fPng_ptr, fInfo_ptr); | |
482 | 480 |
483 return kSuccess; | 481 return kSuccess; |
484 } | 482 } |
485 | 483 |
486 bool SkPngCodec::handleRewind() { | 484 SkCodec::Result SkPngCodec::setDataFormat(const SkImageInfo& requestedInfo) { |
485 if (setjmp(png_jmpbuf(fPng_ptr))) { | |
486 SkCodecPrintf("setjmp long jump!\n"); | |
scroggo
2015/06/30 15:38:37
I know this is the same message that is printed el
emmaleer
2015/06/30 20:13:41
Acknowledged.
| |
487 return kInvalidInput; | |
488 } | |
489 | |
490 fNumberPasses = png_set_interlace_handling(fPng_ptr); | |
491 | |
492 //srcColorType was determined in readHeader() which determined png color ty pe | |
493 int srcColorType = this->getInfo().colorType(); | |
scroggo
2015/06/30 15:38:37
Again, I think these should be SkColorType instead
emmaleer
2015/06/30 20:13:40
Acknowledged.
| |
494 int dstColorType = requestedInfo.colorType(); | |
495 if (kRGBA_8888_SkColorType == dstColorType || kBGRA_8888_SkColorType == dstC olorType) { | |
496 //dstColorType either equals kRGBA_8888_SkColorType or kBGRA_8888_Sk ColorType | |
scroggo
2015/06/30 15:38:37
This seems to just add nothing new to the line abo
emmaleer
2015/06/30 20:13:41
Acknowledged.
| |
497 if (kIndex_8_SkColorType == srcColorType) { | |
scroggo
2015/06/30 15:38:37
nit: This should only be indented 4 spaces from th
emmaleer
2015/06/30 20:13:41
Acknowledged.
| |
498 //convert paletted images to RGBA | |
499 png_set_palette_to_rgb(fPng_ptr); | |
500 if (png_get_valid(fPng_ptr, fInfo_ptr, PNG_INFO_tRNS)) { | |
501 png_set_tRNS_to_alpha(fPng_ptr); | |
502 } else { | |
503 png_set_filler(fPng_ptr, 0xff, PNG_FILLER_AFTER); | |
504 } | |
505 } else if (kGray_8_SkColorType == srcColorType) { | |
506 //convert from Gray to RGBA (need to add filler for alpha as gra y has no alpha) | |
507 png_set_gray_to_rgb(fPng_ptr); | |
508 png_set_filler(fPng_ptr, 0xff, PNG_FILLER_AFTER); | |
509 } | |
510 if (kBGRA_8888_SkColorType == dstColorType) { | |
511 //convert RGBA to BGRA | |
512 png_set_bgr(fPng_ptr); | |
513 } | |
514 } | |
515 png_read_update_info(fPng_ptr, fInfo_ptr); | |
516 return kSuccess; | |
517 } | |
518 | |
519 bool SkPngCodec::handleRewind(const SkImageInfo& requestedInfo) { | |
487 switch (this->rewindIfNeeded()) { | 520 switch (this->rewindIfNeeded()) { |
488 case kNoRewindNecessary_RewindState: | 521 case kNoRewindNecessary_RewindState: |
522 //set transforms needed for requestedInfo format | |
523 if (kSuccess != setDataFormat(requestedInfo)) { | |
scroggo
2015/06/30 15:38:38
nit: this->setDataFormat
emmaleer
2015/06/30 20:13:40
Acknowledged.
| |
524 return false; | |
scroggo
2015/06/30 15:38:37
Interestingly, we've changed the nature of the err
emmaleer
2015/06/30 20:13:40
I think it's important to return the correct resul
| |
525 } | |
489 return true; | 526 return true; |
490 case kCouldNotRewind_RewindState: | 527 case kCouldNotRewind_RewindState: |
491 return false; | 528 return false; |
492 case kRewound_RewindState: { | 529 case kRewound_RewindState: { |
493 // This sets fPng_ptr and fInfo_ptr to NULL. If read_header | 530 // This sets fPng_ptr and fInfo_ptr to NULL. If read_header |
494 // succeeds, they will be repopulated, and if it fails, they will | 531 // succeeds, they will be repopulated, and if it fails, they will |
495 // remain NULL. Any future accesses to fPng_ptr and fInfo_ptr will | 532 // remain NULL. Any future accesses to fPng_ptr and fInfo_ptr will |
496 // come through this function which will rewind and again attempt | 533 // come through this function which will rewind and again attempt |
497 // to reinitialize them. | 534 // to reinitialize them. |
498 this->destroyReadStruct(); | 535 this->destroyReadStruct(); |
499 png_structp png_ptr; | 536 png_structp png_ptr; |
500 png_infop info_ptr; | 537 png_infop info_ptr; |
501 if (read_header(this->stream(), &png_ptr, &info_ptr, NULL)) { | 538 if (read_header(this->stream(), &png_ptr, &info_ptr, NULL, NULL)) { |
502 fPng_ptr = png_ptr; | 539 fPng_ptr = png_ptr; |
503 fInfo_ptr = info_ptr; | 540 fInfo_ptr = info_ptr; |
541 //set transforms needed for requestedInfo format | |
542 if (kSuccess != setDataFormat(requestedInfo)) { | |
scroggo
2015/06/30 15:38:37
this->setDataFormat
emmaleer
2015/06/30 20:13:40
Acknowledged.
| |
543 return false; | |
544 } | |
504 return true; | 545 return true; |
505 } | 546 } |
506 return false; | 547 return false; |
507 } | 548 } |
508 default: | 549 default: |
509 SkASSERT(false); | 550 SkASSERT(false); |
510 return false; | 551 return false; |
511 } | 552 } |
512 } | 553 } |
513 | 554 |
514 SkCodec::Result SkPngCodec::onGetPixels(const SkImageInfo& requestedInfo, void* dst, | 555 SkCodec::Result SkPngCodec::onGetPixels(const SkImageInfo& requestedInfo, void* dst, |
515 size_t rowBytes, const Options& options, | 556 size_t rowBytes, const Options& options, |
516 SkPMColor ctable[], int* ctableCount) { | 557 SkPMColor ctable[], int* ctableCount) { |
517 if (!this->handleRewind()) { | 558 if (!this->handleRewind(requestedInfo)) { |
scroggo
2015/06/30 15:38:38
I notice that setDataFormat never cares if it sees
emmaleer
2015/06/30 20:13:41
I changed it so that conversion_possible is called
| |
518 return kCouldNotRewind; | 559 return kCouldNotRewind; |
519 } | 560 } |
520 if (requestedInfo.dimensions() != this->getInfo().dimensions()) { | 561 if (requestedInfo.dimensions() != this->getInfo().dimensions()) { |
521 return kInvalidScale; | 562 return kInvalidScale; |
522 } | 563 } |
523 if (!conversion_possible(requestedInfo, this->getInfo())) { | 564 if (!conversion_possible(requestedInfo, this->getInfo())) { |
524 return kInvalidConversion; | 565 return kInvalidConversion; |
525 } | 566 } |
526 | 567 |
527 // Note that ctable and ctableCount may be modified if there is a color tabl e | 568 // Note that ctable and ctableCount may be modified if there is a color tabl e |
528 const Result result = this->initializeSwizzler(requestedInfo, dst, rowBytes, | 569 const Result result = this->initializeSwizzler(requestedInfo, dst, rowBytes, |
529 options, ctable, ctableCount) ; | 570 options, ctable, ctableCount) ; |
530 | |
531 if (result != kSuccess) { | 571 if (result != kSuccess) { |
532 return result; | 572 return result; |
533 } | 573 } |
534 | 574 |
scroggo
2015/06/30 15:38:38
It looks like you added some whitespace?
emmaleer
2015/06/30 20:13:41
Acknowledged.
| |
535 // FIXME: Could we use the return value of setjmp to specify the type of | 575 // FIXME: Could we use the return value of setjmp to specify the type of |
536 // error? | 576 // error? |
537 if (setjmp(png_jmpbuf(fPng_ptr))) { | 577 if (setjmp(png_jmpbuf(fPng_ptr))) { |
538 SkCodecPrintf("setjmp long jump!\n"); | 578 SkCodecPrintf("setjmp long jump!\n"); |
539 return kInvalidInput; | 579 return kInvalidInput; |
540 } | 580 } |
541 | 581 |
542 SkASSERT(fNumberPasses != INVALID_NUMBER_PASSES); | 582 SkASSERT(fNumberPasses != INVALID_NUMBER_PASSES); |
543 SkAutoMalloc storage; | 583 SkAutoMalloc storage; |
544 if (fNumberPasses > 1) { | 584 if (fNumberPasses > 1) { |
(...skipping 45 matching lines...) Expand 10 before | Expand all | Expand 10 after Loading... | |
590 /* read rest of file, and get additional chunks in info_ptr - REQUIRED */ | 630 /* read rest of file, and get additional chunks in info_ptr - REQUIRED */ |
591 png_read_end(fPng_ptr, fInfo_ptr); | 631 png_read_end(fPng_ptr, fInfo_ptr); |
592 } | 632 } |
593 | 633 |
594 class SkPngScanlineDecoder : public SkScanlineDecoder { | 634 class SkPngScanlineDecoder : public SkScanlineDecoder { |
595 public: | 635 public: |
596 SkPngScanlineDecoder(const SkImageInfo& dstInfo, SkPngCodec* codec) | 636 SkPngScanlineDecoder(const SkImageInfo& dstInfo, SkPngCodec* codec) |
597 : INHERITED(dstInfo) | 637 : INHERITED(dstInfo) |
598 , fCodec(codec) | 638 , fCodec(codec) |
599 , fHasAlpha(false) | 639 , fHasAlpha(false) |
640 , fSrcRowBytes(dstInfo.minRowBytes()) | |
scroggo
2015/06/30 15:38:37
Why do we need to store this? It seems like we onl
emmaleer
2015/06/30 20:13:40
I removed this
| |
600 { | 641 { |
601 fStorage.reset(dstInfo.width() * SkSwizzler::BytesPerPixel(fCodec->fSrcC onfig)); | 642 fStorage.reset(dstInfo.width() * fSrcRowBytes); |
scroggo
2015/06/30 15:38:37
I don't think this is what you want. minRowBytes()
emmaleer
2015/06/30 20:13:41
Yes, this is wrong. I changed this back to using
| |
602 fSrcRow = static_cast<uint8_t*>(fStorage.get()); | 643 fSrcRow = static_cast<uint8_t*>(fStorage.get()); |
603 } | 644 } |
604 | 645 |
605 SkImageGenerator::Result onGetScanlines(void* dst, int count, size_t rowByte s) override { | 646 SkImageGenerator::Result onGetScanlines(void* dst, int count, size_t rowByte s) override { |
606 if (setjmp(png_jmpbuf(fCodec->fPng_ptr))) { | 647 if (setjmp(png_jmpbuf(fCodec->fPng_ptr))) { |
607 SkCodecPrintf("setjmp long jump!\n"); | 648 SkCodecPrintf("setjmp long jump!\n"); |
608 return SkImageGenerator::kInvalidInput; | 649 return SkImageGenerator::kInvalidInput; |
609 } | 650 } |
610 | 651 |
611 for (int i = 0; i < count; i++) { | 652 for (int i = 0; i < count; i++) { |
(...skipping 25 matching lines...) Expand all Loading... | |
637 fCodec->finish(); | 678 fCodec->finish(); |
638 } | 679 } |
639 | 680 |
640 bool onReallyHasAlpha() const override { return fHasAlpha; } | 681 bool onReallyHasAlpha() const override { return fHasAlpha; } |
641 | 682 |
642 private: | 683 private: |
643 SkPngCodec* fCodec; // Unowned. | 684 SkPngCodec* fCodec; // Unowned. |
644 bool fHasAlpha; | 685 bool fHasAlpha; |
645 SkAutoMalloc fStorage; | 686 SkAutoMalloc fStorage; |
646 uint8_t* fSrcRow; | 687 uint8_t* fSrcRow; |
688 size_t fSrcRowBytes; | |
647 | 689 |
648 typedef SkScanlineDecoder INHERITED; | 690 typedef SkScanlineDecoder INHERITED; |
649 }; | 691 }; |
650 | 692 |
651 | 693 |
652 class SkPngInterlacedScanlineDecoder : public SkScanlineDecoder { | 694 class SkPngInterlacedScanlineDecoder : public SkScanlineDecoder { |
653 public: | 695 public: |
654 SkPngInterlacedScanlineDecoder(const SkImageInfo& dstInfo, SkPngCodec* codec ) | 696 SkPngInterlacedScanlineDecoder(const SkImageInfo& dstInfo, SkPngCodec* codec ) |
655 : INHERITED(dstInfo) | 697 : INHERITED(dstInfo) |
656 , fCodec(codec) | 698 , fCodec(codec) |
657 , fHasAlpha(false) | 699 , fHasAlpha(false) |
658 , fCurrentRow(0) | 700 , fCurrentRow(0) |
659 , fHeight(dstInfo.height()) | 701 , fHeight(dstInfo.height()) |
660 , fSrcRowBytes(dstInfo.minRowBytes()) | 702 , fSrcRowBytes(dstInfo.minRowBytes()) |
661 , fRewindNeeded(false) | 703 , fRewindNeeded(false) |
704 , fDstInfo(dstInfo) | |
662 { | 705 { |
663 fGarbageRow.reset(fSrcRowBytes); | 706 fGarbageRow.reset(fSrcRowBytes); |
664 fGarbageRowPtr = static_cast<uint8_t*>(fGarbageRow.get()); | 707 fGarbageRowPtr = static_cast<uint8_t*>(fGarbageRow.get()); |
665 } | 708 } |
666 | 709 |
667 SkImageGenerator::Result onGetScanlines(void* dst, int count, size_t dstRowB ytes) override { | 710 SkImageGenerator::Result onGetScanlines(void* dst, int count, size_t dstRowByte s) override { |
scroggo
2015/06/30 15:38:38
This should be indented 4 spaces.
emmaleer
2015/06/30 20:13:41
Acknowledged.
| |
668 //rewind stream if have previously called onGetScanlines, | 711 //rewind stream if have previously called onGetScanlines, |
669 //since we need entire progressive image to get scanlines | 712 //since we need entire progressive image to get scanlines |
713 //need to reset transforms in setDataFormat if stream is rewound | |
670 if (fRewindNeeded) { | 714 if (fRewindNeeded) { |
671 if(false == fCodec->handleRewind()) { | 715 if(false == fCodec->handleRewind(fDstInfo)) { |
scroggo
2015/06/30 15:38:38
Alternatively, you could use this->dstInfo(), whic
emmaleer
2015/06/30 20:13:41
Acknowledged.
| |
672 return SkImageGenerator::kCouldNotRewind; | 716 return SkImageGenerator::kCouldNotRewind; |
673 } | 717 } |
674 } else { | 718 } else { |
675 fRewindNeeded = true; | 719 fRewindNeeded = true; |
676 } | 720 } |
677 if (setjmp(png_jmpbuf(fCodec->fPng_ptr))) { | 721 if (setjmp(png_jmpbuf(fCodec->fPng_ptr))) { |
678 SkCodecPrintf("setjmp long jump!\n"); | 722 SkCodecPrintf("setjmp long jump!\n"); |
679 return SkImageGenerator::kInvalidInput; | 723 return SkImageGenerator::kInvalidInput; |
680 } | 724 } |
681 const int number_passes = png_set_interlace_handling(fCodec->fPng_ptr); | 725 const int number_passes = png_set_interlace_handling(fCodec->fPng_ptr); |
(...skipping 21 matching lines...) Expand all Loading... | |
703 for (int y = 0; y < count; y++) { | 747 for (int y = 0; y < count; y++) { |
704 fCodec->fSwizzler->setDstRow(dst); | 748 fCodec->fSwizzler->setDstRow(dst); |
705 fHasAlpha |= !SkSwizzler::IsOpaque(fCodec->fSwizzler->next(srcRow)); | 749 fHasAlpha |= !SkSwizzler::IsOpaque(fCodec->fSwizzler->next(srcRow)); |
706 dst = SkTAddOffset<void>(dst, dstRowBytes); | 750 dst = SkTAddOffset<void>(dst, dstRowBytes); |
707 srcRow += fSrcRowBytes; | 751 srcRow += fSrcRowBytes; |
708 } | 752 } |
709 fCurrentRow += count; | 753 fCurrentRow += count; |
710 return SkImageGenerator::kSuccess; | 754 return SkImageGenerator::kSuccess; |
711 } | 755 } |
712 | 756 |
713 SkImageGenerator::Result onSkipScanlines(int count) override { | 757 SkImageGenerator::Result onSkipScanlines(int count) override { |
scroggo
2015/06/30 15:38:37
More added whitespace?
| |
714 //when ongetScanlines is called it will skip to fCurrentRow | 758 //when ongetScanlines is called it will skip to fCurrentRow |
715 fCurrentRow += count; | 759 fCurrentRow += count; |
716 return SkImageGenerator::kSuccess; | 760 return SkImageGenerator::kSuccess; |
717 } | 761 } |
718 | 762 |
719 void onFinish() override { | 763 void onFinish() override { |
720 fCodec->finish(); | 764 fCodec->finish(); |
721 } | 765 } |
722 | 766 |
723 bool onReallyHasAlpha() const override { return fHasAlpha; } | 767 bool onReallyHasAlpha() const override { return fHasAlpha; } |
724 | 768 |
725 private: | 769 private: |
726 SkPngCodec* fCodec; // Unowned. | 770 SkPngCodec* fCodec; // Unowned. |
727 bool fHasAlpha; | 771 bool fHasAlpha; |
728 int fCurrentRow; | 772 int fCurrentRow; |
729 int fHeight; | 773 int fHeight; |
730 size_t fSrcRowBytes; | 774 size_t fSrcRowBytes; |
731 bool fRewindNeeded; | 775 bool fRewindNeeded; |
732 SkAutoMalloc fGarbageRow; | 776 SkAutoMalloc fGarbageRow; |
733 uint8_t* fGarbageRowPtr; | 777 uint8_t* fGarbageRowPtr; |
734 | 778 const SkImageInfo& fDstInfo; |
735 | |
736 | |
737 | |
738 | |
739 typedef SkScanlineDecoder INHERITED; | 779 typedef SkScanlineDecoder INHERITED; |
740 }; | 780 }; |
741 | 781 |
742 | 782 |
743 SkScanlineDecoder* SkPngCodec::onGetScanlineDecoder(const SkImageInfo& dstInfo, | 783 SkScanlineDecoder* SkPngCodec::onGetScanlineDecoder(const SkImageInfo& dstInfo, |
744 const Options& options, SkPMColor ctable[], int* ctableCount) { | 784 const Options& options, SkPMColor ctable[], int* ctableCount) { |
745 if (!this->handleRewind()) { | 785 if (!this->handleRewind(dstInfo)) { |
746 return NULL; | 786 return NULL; |
747 } | 787 } |
748 | 788 |
749 // Check to see if scaling was requested. | 789 // Check to see if scaling was requested. |
750 if (dstInfo.dimensions() != this->getInfo().dimensions()) { | 790 if (dstInfo.dimensions() != this->getInfo().dimensions()) { |
751 return NULL; | 791 return NULL; |
752 } | 792 } |
753 | 793 |
754 if (!conversion_possible(dstInfo, this->getInfo())) { | 794 if (!conversion_possible(dstInfo, this->getInfo())) { |
755 SkCodecPrintf("no conversion possible\n"); | 795 SkCodecPrintf("no conversion possible\n"); |
756 return NULL; | 796 return NULL; |
757 } | 797 } |
758 | 798 |
759 // Note: We set dst to NULL since we do not know it yet. rowBytes is not nee ded, | 799 // Note: We set dst to NULL since we do not know it yet. rowBytes is not need ed, |
scroggo
2015/06/30 15:38:37
nit: 4 space indent.
emmaleer
2015/06/30 20:13:41
Acknowledged.
| |
760 // since we'll be manually updating the dstRow, but the SkSwizzler requires it to | 800 // since we'll be manually updating the dstRow, but the SkSwizzler requires it to |
761 // be at least dstInfo.minRowBytes. | 801 // be at least dstInfo.minRowBytes. |
762 if (this->initializeSwizzler(dstInfo, NULL, dstInfo.minRowBytes(), options, ctable, | 802 if (this->initializeSwizzler(dstInfo, NULL, dstInfo.minRowBytes(), options, ctable, |
763 ctableCount) != kSuccess) { | 803 ctableCount) != kSuccess) { |
764 SkCodecPrintf("failed to initialize the swizzler.\n"); | 804 SkCodecPrintf("failed to initialize the swizzler.\n"); |
765 return NULL; | 805 return NULL; |
766 } | 806 } |
767 | 807 |
768 SkASSERT(fNumberPasses != INVALID_NUMBER_PASSES); | 808 SkASSERT(fNumberPasses != INVALID_NUMBER_PASSES); |
769 if (fNumberPasses > 1) { | 809 if (fNumberPasses > 1) { |
770 // interlaced image | 810 // interlaced image |
771 return SkNEW_ARGS(SkPngInterlacedScanlineDecoder, (dstInfo, this)); | 811 return SkNEW_ARGS(SkPngInterlacedScanlineDecoder, (dstInfo, this)); |
772 } | 812 } |
773 | 813 |
774 return SkNEW_ARGS(SkPngScanlineDecoder, (dstInfo, this)); | 814 return SkNEW_ARGS(SkPngScanlineDecoder, (dstInfo, this)); |
775 } | 815 } |
776 | 816 |
OLD | NEW |