00127573f6
OBS-URL: https://build.opensuse.org/package/show/Publishing:TeXLive/texlive?expand=0&rev=291
30 lines
1.2 KiB
Plaintext
30 lines
1.2 KiB
Plaintext
--- texk/dvipdfm-x/pngimage.c_orig 2018-04-27 02:37:38.954103428 +0200
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+++ texk/dvipdfm-x/pngimage.c 2018-04-27 02:48:48.121731743 +0200
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@@ -964,12 +964,16 @@
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png_bytep trans;
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int num_trans;
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png_uint_32 i;
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+ png_byte bpc, mask, shift;
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if (!png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS) ||
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!png_get_tRNS(png_ptr, info_ptr, &trans, &num_trans, NULL)) {
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WARN("%s: PNG does not have valid tRNS chunk but tRNS is requested.", PNG_DEBUG_STR);
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return NULL;
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}
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+ bpc = png_get_bit_depth(png_ptr, info_ptr);
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+ mask = 0xff >> (8 - bpc);
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+ shift = 8 - bpc;
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smask = pdf_new_stream(STREAM_COMPRESS);
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dict = pdf_stream_dict(smask);
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@@ -981,7 +985,8 @@
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pdf_add_dict(dict, pdf_new_name("ColorSpace"), pdf_new_name("DeviceGray"));
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pdf_add_dict(dict, pdf_new_name("BitsPerComponent"), pdf_new_number(8));
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for (i = 0; i < width*height; i++) {
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- png_byte idx = image_data_ptr[i];
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+ /* data is packed for 1/2/4 bpc formats, msb first */
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+ png_byte idx = (image_data_ptr[bpc * i / 8] >> (shift - bpc * i % 8)) & mask;
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smask_data_ptr[i] = (idx < num_trans) ? trans[idx] : 0xff;
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}
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pdf_add_stream(smask, (char *)smask_data_ptr, width*height);
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