ryan/mozjpeg
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Restore backward ABI compatibility with libjpeg/libjpeg-turbo by moving the mozjpeg-specific parameters into the opaque jpeg_comp_master struct and implementing generic accessor functions for getting/setting those parameters. These functions can be used upstream, if the need for them arises in libjpeg-turbo, and they can also be easily extended to cover future extensions to the decompressor. Note that, in order to use jpeg_comp_master as a repository for extension parameters, cinfo->master is now allocated within the body of jpeg_CreateCompress(). It is later re-allocated in jinit_c_master_control(), because that function (and others in jcmaster.c) use an extended form of jpeg_comp_master, but the existing extension parameters are copied into the new master instance. Similar modifications would need to be made to the decompressor to support the same type of extension framework.

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DRC
2014-11-04 01:51:15 -06:00
parent e581ede148
commit db2986c96f
27 changed files with 575 additions and 186 deletions
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rdswitch.c
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@@ -314,7 +314,8 @@ static const unsigned int flat_quant_tbl[DCTSIZE2] = {
LOCAL(void)
jpeg_default_qtables (j_compress_ptr cinfo, boolean force_baseline)
{
if (cinfo->use_flat_quant_tbl) {
if (jpeg_c_bool_param_supported(cinfo, JBOOLEAN_USE_FLAT_QUANT_TBL) &&
jpeg_c_get_bool_param(cinfo, JBOOLEAN_USE_FLAT_QUANT_TBL)) {
jpeg_add_quant_table(cinfo, 0, flat_quant_tbl,
q_scale_factor[0], force_baseline);
jpeg_add_quant_table(cinfo, 1, flat_quant_tbl,