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Tidy pdf-create example

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Convert loop to use range-based for statement.
Remove unnecessary variables.
This commit is contained in:
m-holger 2022-02-26 15:42:47 +00:00 committed by Jay Berkenbilt
parent 33e8195c3a
commit 1253d1be60
1 changed files with 15 additions and 27 deletions
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42
examples/pdf-create.cc
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@ -182,15 +182,15 @@ void add_page(QPDFPageDocumentHelper& dh, QPDFObjectHandle font,
size_t width = p->getWidth();
size_t height = p->getHeight();
QPDFObjectHandle image = QPDFObjectHandle::newStream(&pdf);
image.replaceDict("<<"
auto image_dict = "<<"
" /Type /XObject"
" /Subtype /Image"
" /BitsPerComponent 8"
">>"_qpdf);
QPDFObjectHandle image_dict = image.getDict();
">>"_qpdf;
image_dict.replaceKey("/ColorSpace", newName(color_space));
image_dict.replaceKey("/Width", newInteger(width));
image_dict.replaceKey("/Height", newInteger(height));
image.replaceDict(image_dict);
// Provide the stream data.
image.replaceStreamData(provider,
@ -211,21 +211,16 @@ void add_page(QPDFPageDocumentHelper& dh, QPDFObjectHandle font,
resources.replaceKey("/Font", rfont);
resources.replaceKey("/XObject", xobject);
QPDFObjectHandle mediabox = QPDFObjectHandle::newArray();
mediabox.appendItem(newInteger(0));
mediabox.appendItem(newInteger(0));
mediabox.appendItem(newInteger(612));
mediabox.appendItem(newInteger(392));
// Create the page content stream
QPDFObjectHandle contents = createPageContents(
pdf, color_space + " with filter " + filter);
// Create the page dictionary
QPDFObjectHandle page = pdf.makeIndirectObject(
QPDFObjectHandle::newDictionary());
page.replaceKey("/Type", newName("/Page"));
page.replaceKey("/MediaBox", mediabox);
"<<"
" /Type /Page"
" /MediaBox [0 0 612 392]"
">>"_qpdf);
page.replaceKey("/Contents", contents);
page.replaceKey("/Resources", resources);
@ -257,20 +252,16 @@ static void check(char const* filename,
QPDF pdf;
pdf.processFile(filename);
QPDFPageDocumentHelper dh(pdf);
std::vector<QPDFPageObjectHelper> pages = dh.getAllPages();
auto pages = QPDFPageDocumentHelper(pdf).getAllPages();
if (n_color_spaces * n_filters != pages.size())
{
throw std::logic_error("incorrect number of pages");
}
size_t pageno = 1;
bool errors = false;
for (std::vector<QPDFPageObjectHelper>::iterator page_iter =
pages.begin();
page_iter != pages.end(); ++page_iter)
for (auto& page : pages)
{
QPDFPageObjectHelper& page(*page_iter);
std::map<std::string, QPDFObjectHandle> images = page.getImages();
auto images = page.getImages();
if (images.size() != 1)
{
throw std::logic_error("incorrect number of images on page");
@ -279,8 +270,7 @@ static void check(char const* filename,
// Check filter and color space.
std::string desired_color_space =
color_spaces[(pageno - 1) / n_color_spaces];
std::string desired_filter =
filters[(pageno - 1) % n_filters];
std::string desired_filter = filters[(pageno - 1) % n_filters];
// In the default mode, QPDFWriter will compress with
// /FlateDecode if no filters are provided.
if (desired_filter == "null")
@ -310,7 +300,7 @@ static void check(char const* filename,
if (! this_errors)
{
// Check image data
PointerHolder<Buffer> actual_data =
auto actual_data =
image.getStreamData(qpdf_dl_all);
ImageProvider* p = new ImageProvider(desired_color_space, "null");
PointerHolder<QPDFObjectHandle::StreamDataProvider> provider(p);
@ -399,13 +389,11 @@ static void create_pdf(char const* filename)
filters.push_back("/DCTDecode");
filters.push_back("/RunLengthDecode");
QPDFPageDocumentHelper dh(pdf);
for (std::vector<std::string>::iterator c_iter = color_spaces.begin();
c_iter != color_spaces.end(); ++c_iter)
for (auto const& color_space : color_spaces)
{
for (std::vector<std::string>::iterator f_iter = filters.begin();
f_iter != filters.end(); ++f_iter)
for (auto const& filter : filters)
{
add_page(dh, font, *c_iter, *f_iter);
add_page(dh, font, color_space, filter);
}
}