SKIA中的JPEG编解码

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bool SkJPEGImageDecoder::onDecode(SkStream* stream, SkBitmap* bm, Mode mode) [SkImageDecoder_libjpeg.cpp。继承自SkImageDecoder.cpp中的SkImageDecoder，实现OnDecode。]
GLOBAL(boolean) jpeg_start_decompress (j_decompress_ptr cinfo) [Jdapistd.c]
GLOBAL(JDIMENSION) jpeg_read_scanlines (j_decompress_ptr cinfo, JSAMPARRAY scanlines, JDIMENSION max_lines) [Jdapistd.c]
process_data_simple_main / process_data_context_main / process_data_crank_post [Jdmainct.c]
post_process_1pass / post_process_prepass [Jdpostct.c]
(void) sep_upsample (j_decompress_ptr cinfo,JSAMPIMAGE input_buf, JDIMENSION *in_row_group_ctr,JDIMENSION in_row_groups_avail,JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,JDIMENSION out_rows_avail) [Jdsample.c]
(void) ycc_rgba_8888_convert (j_decompress_ptr cinfo, JSAMPIMAGE input_buf, JDIMENSION input_row, JSAMPARRAY output_buf, int num_rows) [jdcolor.c]

SkJPEGImageDecoder.onDecodeRegion(SkImageDecoder_libjpeg.cpp)
jpeg_init_read_tile_scanline(jdapistd.c)
jinit_color_deconverter(jdcolor.c，注册ycc_rgba_8888_convert) jinit_upsampler(jdsample.c,注册sep_upsample)