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Fixed JPEG chroma subsampling on TurboLibJPEG

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Ylian Saint-Hilaire
2021-03-25 16:58:15 -07:00
parent 0c1358a9ac
commit 6c36f2fa6b
1 changed files with 14 additions and 7 deletions
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13
meshcore/KVM/Linux/linux_compression.c
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@@ -98,14 +98,22 @@ int write_JPEG_buffer (JSAMPLE * image_buffer, int image_width, int image_height
cinfo.dest->init_destination = &init_destination; cinfo.dest->init_destination = &init_destination;
cinfo.dest->empty_output_buffer = &empty_output_buffer; cinfo.dest->empty_output_buffer = &empty_output_buffer;
cinfo.dest->term_destination = &term_destination; cinfo.dest->term_destination = &term_destination;
cinfo.comp_info[0].v_samp_factor = 1;
cinfo.comp_info[0].h_samp_factor = 1;
cinfo.image_width = image_width; cinfo.image_width = image_width;
cinfo.image_height = image_height; cinfo.image_height = image_height;
cinfo.input_components = 3; cinfo.input_components = 3;
cinfo.in_color_space = JCS_RGB; cinfo.in_color_space = JCS_RGB;
jpeg_set_defaults(&cinfo); jpeg_set_defaults(&cinfo);
// 4:4:4, 1x1 (no subsampling)
// The resolution of chrominance information (Cb & Cr) is preserved at the same rate as the luminance (Y) information
cinfo.comp_info[0].v_samp_factor = 1;
cinfo.comp_info[0].h_samp_factor = 1;
cinfo.comp_info[1].v_samp_factor = 1;
cinfo.comp_info[1].h_samp_factor = 1;
cinfo.comp_info[2].v_samp_factor = 1;
cinfo.comp_info[2].h_samp_factor = 1;
jpeg_set_quality(&cinfo, quality, TRUE); jpeg_set_quality(&cinfo, quality, TRUE);
jpeg_start_compress(&cinfo, TRUE); jpeg_start_compress(&cinfo, TRUE);
row_stride = image_width * 3; row_stride = image_width * 3;
@@ -124,4 +132,3 @@ int write_JPEG_buffer (JSAMPLE * image_buffer, int image_width, int image_height
return 0; return 0;
} }