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Cleanup PR for PDF/A support and add documentation (Issue #122)

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This commit is contained in:
Michael R Sweet
2025-10-05 15:19:15 -04:00
parent d82da750d9
commit 26a92febc6
6 changed files with 316 additions and 191 deletions
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20
pdfio-content.c
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@@ -1700,6 +1700,8 @@ pdfioFileAddOutputIntent(
// (ISO-8859-1 with additional characters such as the Euro symbol) subset of
// Unicode.
//
// > Note: This function cannot be used when producing PDF/A files.
//
pdfio_obj_t * // O - Font object
pdfioFileCreateFontObjFromBase(
@@ -1709,7 +1711,8 @@ pdfioFileCreateFontObjFromBase(
pdfio_dict_t *dict; // Font dictionary
pdfio_obj_t *obj; // Font object
if (pdf && pdf->pdfa != _PDFIO_PDFA_NONE)
if (pdf && pdf->profile >= _PDFIO_PROFILE_PDFA_1A && pdf->profile <= _PDFIO_PROFILE_PDFA_4)
{
_pdfioFileError(pdf, "Base fonts are not allowed in PDF/A files; use pdfioFileCreateFontObjFromFile to embed a font.");
return (NULL);
@@ -2052,8 +2055,9 @@ pdfioFileCreateICCObjFromFile(
// "interpolate" parameter specifies whether to interpolate when scaling the
// image on the page.
//
// Note: When creating an image object with alpha, a second image object is
// created to hold the "soft mask" data for the primary image.
// > Note: When creating an image object with alpha, a second image object is
// > created to hold the "soft mask" data for the primary image. PDF/A-1
// > files do not support alpha-based transparency.
//
pdfio_obj_t * // O - Object
@@ -2078,7 +2082,7 @@ pdfioFileCreateImageObjFromData(
};
if (pdf && (pdf->pdfa == _PDFIO_PDFA_1A || pdf->pdfa == _PDFIO_PDFA_1B) && alpha)
if (pdf && pdf->profile >= _PDFIO_PROFILE_PDFA_1A && pdf->profile <= _PDFIO_PROFILE_PDFA_1B && alpha)
{
_pdfioFileError(pdf, "Images with transparency (alpha channels) are not allowed in PDF/A-1 files.");
return (NULL);
@@ -2117,9 +2121,8 @@ pdfioFileCreateImageObjFromData(
// the "interpolate" parameter specifies whether to interpolate when scaling the
// image on the page.
//
// > Note: Currently PNG support is limited to grayscale, RGB, or indexed files
// > without interlacing or alpha. Transparency (masking) based on color/index
// > is supported.
// > Note: PNG files containing transparency cannot be used when producing
// > PDF/A files.
//
pdfio_obj_t * // O - Object
@@ -2750,7 +2753,7 @@ copy_png(pdfio_dict_t *dict, // I - Dictionary
depth = png_get_bit_depth(pp, info);
color_type = png_get_color_type(pp, info);
if ((dict->pdf->pdfa == _PDFIO_PDFA_1A || dict->pdf->pdfa == _PDFIO_PDFA_1B) && (color_type & PNG_COLOR_MASK_ALPHA))
if (dict->pdf->profile >= _PDFIO_PROFILE_PDFA_1A && dict->pdf->profile <= _PDFIO_PROFILE_PDFA_1B && (color_type & PNG_COLOR_MASK_ALPHA))
{
_pdfioFileError(dict->pdf, "PNG images with transparency (alpha channels) are not allowed in PDF/A-1 files.");
goto finish_png;
@@ -2874,7 +2877,6 @@ copy_png(pdfio_dict_t *dict, // I - Dictionary
if (pp && info)
{
png_read_end(pp, info);
png_destroy_read_struct(&pp, &info, NULL);
pp = NULL;