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Add text color and optimize text groups into whole blocks.
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Add UNICODE_VALUE define to allow toggling between Unicode and ISO-8859-1 modes.
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@michaelrsweet
michaelrsweet committed Dec 10, 2024
1 parent 5a4afad commit 4b29c9a
Showing 1 changed file with 110 additions and 36 deletions.
146 changes: 110 additions & 36 deletions examples/md2pdf.c
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Original file line number Diff line number Diff line change
Expand Up @@ -29,6 +29,15 @@
// Types...
//

typedef enum doccolor_e // Document color enumeration
{
DOCCOLOR_BLACK, // #000
DOCCOLOR_RED, // #900
DOCCOLOR_GREEN, // #090
DOCCOLOR_BLUE, // #00C
DOCCOLOR_GRAY // #555
} doccolor_t;

typedef enum docfont_e // Document font enumeration
{
DOCFONT_REGULAR, // Roboto-Regular
Expand Down Expand Up @@ -59,6 +68,7 @@ typedef struct docdata_s // Document formatting data
char *heading; // Current document heading
pdfio_stream_t *st; // Current page stream
double y; // Current position on page
doccolor_t color; // Current color
} docdata_t;


Expand Down Expand Up @@ -90,17 +100,18 @@ static const char * const docfont_names[] =
"FM"
};

#define LINE_HEIGHT 1.2 // Multiplier for line height
#define LINE_HEIGHT 1.4 // Multiplier for line height

#define SIZE_BODY 11.0 // Size of body text (points)
#define SIZE_HEADFOOT 9.0 // Size of header/footer text
#define SIZE_HEADING_1 18.0 // Size of first level heading
#define SIZE_HEADING_2 16.0 // Size of top level heading
#define SIZE_HEADING_3 15.0 // Size of top level heading
#define SIZE_HEADING_4 14.0 // Size of top level heading
#define SIZE_HEADING_5 13.0 // Size of top level heading
#define SIZE_HEADING_6 12.0 // Size of top level heading
#define SIZE_TABLE 10.0 // Size of table text
#define SIZE_CODEBLOCK 10.0 // Size of code block text (points)
#define SIZE_HEADFOOT 9.0 // Size of header/footer text (points)
#define SIZE_HEADING_1 18.0 // Size of first level heading (points)
#define SIZE_HEADING_2 16.0 // Size of top level heading (points)
#define SIZE_HEADING_3 15.0 // Size of top level heading (points)
#define SIZE_HEADING_4 14.0 // Size of top level heading (points)
#define SIZE_HEADING_5 13.0 // Size of top level heading (points)
#define SIZE_HEADING_6 12.0 // Size of top level heading (points)
#define SIZE_TABLE 10.0 // Size of table text (points)

#define PAGE_WIDTH mm2pt(210) // Page width in points
#define PAGE_LENGTH in2pt(11) // Page length in points
Expand All @@ -114,6 +125,44 @@ static const char * const docfont_names[] =
// Vertical position of header
#define PAGE_FOOTER in2pt(0.5) // Vertical position of footer

#define UNICODE_VALUE true // `true` for Unicode text, `false` for ISO-8859-1


//
// 'set_color()' - Set the stroke and fill color.
//

static void
set_color(docdata_t *dd, // I - Document data
doccolor_t color) // I - Document color
{
switch (color)
{
case DOCCOLOR_BLACK :
pdfioContentSetFillColorDeviceGray(dd->st, 0.0);
pdfioContentSetStrokeColorDeviceGray(dd->st, 0.0);
break;
case DOCCOLOR_RED :
pdfioContentSetFillColorDeviceRGB(dd->st, 0.6, 0.0, 0.0);
pdfioContentSetStrokeColorDeviceRGB(dd->st, 0.6, 0.0, 0.0);
break;
case DOCCOLOR_GREEN :
pdfioContentSetFillColorDeviceRGB(dd->st, 0.0, 0.6, 0.0);
pdfioContentSetStrokeColorDeviceRGB(dd->st, 0.0, 0.6, 0.0);
break;
case DOCCOLOR_BLUE :
pdfioContentSetFillColorDeviceRGB(dd->st, 0.0, 0.0, 0.8);
pdfioContentSetStrokeColorDeviceRGB(dd->st, 0.0, 0.0, 0.8);
break;
case DOCCOLOR_GRAY :
pdfioContentSetFillColorDeviceGray(dd->st, 0.333);
pdfioContentSetStrokeColorDeviceGray(dd->st, 0.333);
break;
}

dd->color = color;
}


//
// 'new_page()' - Start a new page.
Expand Down Expand Up @@ -151,8 +200,7 @@ new_page(docdata_t *dd) // I - Document data
dd->st = pdfioFileCreatePage(dd->pdf, page_dict);

// Add header/footer text
pdfioContentSetFillColorGray(dd->st, 0.333);
pdfioContentSetStrokeColorGray(dd->st, 0.333);
set_color(dd, DOCCOLOR_GRAY);
pdfioContentSetTextFont(dd->st, docfont_names[DOCFONT_REGULAR], SIZE_HEADFOOT);

if (pdfioFileGetNumPages(dd->pdf) > 1 && dd->title)
Expand All @@ -162,7 +210,7 @@ new_page(docdata_t *dd) // I - Document data

pdfioContentTextBegin(dd->st);
pdfioContentTextMoveTo(dd->st, dd->crop_box.x1 + 0.5 * (dd->crop_box.x2 - dd->crop_box.x1 - width), dd->crop_box.y2 - SIZE_HEADFOOT);
pdfioContentTextShow(dd->st, /*unicode*/true, dd->title);
pdfioContentTextShow(dd->st, UNICODE_VALUE, dd->title);
pdfioContentTextEnd(dd->st);

pdfioContentPathMoveTo(dd->st, dd->crop_box.x1, dd->crop_box.y2 - 2 * SIZE_HEADFOOT * LINE_HEIGHT + SIZE_HEADFOOT);
Expand All @@ -189,12 +237,13 @@ new_page(docdata_t *dd) // I - Document data
pdfioContentTextMoveTo(dd->st, dd->crop_box.x1, dd->crop_box.y1);
}

pdfioContentTextShow(dd->st, /*unicode*/true, temp);
pdfioContentTextShow(dd->st, UNICODE_VALUE, temp);
pdfioContentTextEnd(dd->st);

if (dd->heading)
{
pdfioContentTextBegin(dd->st);

if (pdfioFileGetNumPages(dd->pdf) & 1)
{
// Current heading on left...
Expand All @@ -206,13 +255,12 @@ new_page(docdata_t *dd) // I - Document data
pdfioContentTextMoveTo(dd->st, dd->crop_box.x2 - width, dd->crop_box.y1);
}

pdfioContentTextShow(dd->st, /*unicode*/true, dd->heading);
pdfioContentTextShow(dd->st, UNICODE_VALUE, dd->heading);
pdfioContentTextEnd(dd->st);
}

// The rest of the text will be full black...
pdfioContentSetFillColorGray(dd->st, 0.0);
pdfioContentSetStrokeColorGray(dd->st, 0.0);
set_color(dd, DOCCOLOR_BLACK);

dd->y = dd->art_box.y2;
}
Expand Down Expand Up @@ -242,7 +290,9 @@ format_block(docdata_t *dd, // I - Document data
prevface; // Previous font face
double x, y; // Current position
double width, // Width of current fragment
lwidth, // Leader width
wswidth; // Width of whitespace
doccolor_t color; // Color of text


blocktype = mmdGetType(block);
Expand All @@ -261,16 +311,17 @@ format_block(docdata_t *dd, // I - Document data
// Add leader text on first line...
pdfioContentSetTextFont(dd->st, docfont_names[prevface = fontface], fontsize);

width = pdfioContentTextMeasure(dd->fonts[fontface], leader, fontsize);
lwidth = pdfioContentTextMeasure(dd->fonts[fontface], leader, fontsize);

pdfioContentTextBegin(dd->st);
pdfioContentTextMoveTo(dd->st, left - width, y);
pdfioContentTextShow(dd->st, /*unicode*/true, leader);
pdfioContentTextMoveTo(dd->st, left - lwidth, y);
pdfioContentTextShow(dd->st, UNICODE_VALUE, leader);
}
else
{
// No leader text...
prevface = DOCFONT_MAX;
lwidth = 0.0;
}

for (current = mmdGetFirstChild(block), x = left; current; current = next)
Expand Down Expand Up @@ -314,6 +365,13 @@ format_block(docdata_t *dd, // I - Document data
else
curface = fontface;

if (curtype == MMD_TYPE_CODE_TEXT)
color = DOCCOLOR_RED;
else if (curtype == MMD_TYPE_LINKED_TEXT)
color = DOCCOLOR_BLUE;
else
color = DOCCOLOR_BLACK;

width = pdfioContentTextMeasure(dd->fonts[curface], curtext, fontsize);
if (curws)
wswidth = pdfioContentTextMeasure(dd->fonts[curface], " ", fontsize);
Expand All @@ -326,38 +384,48 @@ format_block(docdata_t *dd, // I - Document data
x = left;
y -= fontsize * LINE_HEIGHT;

if (prevface != DOCFONT_MAX)
pdfioContentTextEnd(dd->st);

prevface = DOCFONT_MAX;

if (y < dd->art_box.y1)
{
// New page...
if (prevface != DOCFONT_MAX)
{
pdfioContentTextEnd(dd->st);
prevface = DOCFONT_MAX;
}

new_page(dd);

y = dd->y - fontsize * LINE_HEIGHT;
}
else
{
pdfioContentTextMoveTo(dd->st, lwidth, -fontsize * LINE_HEIGHT);
lwidth = 0.0;
}
}

if (curface != prevface)
{
if (prevface != DOCFONT_MAX)
pdfioContentTextEnd(dd->st);
if (prevface == DOCFONT_MAX)
{
pdfioContentTextBegin(dd->st);
pdfioContentTextMoveTo(dd->st, x, y);
}

pdfioContentSetTextFont(dd->st, docfont_names[prevface = curface], fontsize);
pdfioContentTextBegin(dd->st);
pdfioContentTextMoveTo(dd->st, x, y);
}

if (color != dd->color)
set_color(dd, color);

if (x > left && curws)
{
pdfioContentTextShowf(dd->st, /*unicode*/true, " %s", curtext);
pdfioContentTextShowf(dd->st, UNICODE_VALUE, " %s", curtext);
x += width + wswidth;
}
else
{
pdfioContentTextShow(dd->st, /*unicode*/true, curtext);
pdfioContentTextShow(dd->st, UNICODE_VALUE, curtext);
x += width;
}

Expand All @@ -367,18 +435,24 @@ format_block(docdata_t *dd, // I - Document data
x = left;
y -= fontsize * LINE_HEIGHT;

if (prevface != DOCFONT_MAX)
pdfioContentTextEnd(dd->st);

prevface = DOCFONT_MAX;

if (y < dd->art_box.y1)
{
// New page...
if (prevface != DOCFONT_MAX)
{
pdfioContentTextEnd(dd->st);
prevface = DOCFONT_MAX;
}

new_page(dd);

y = dd->y - fontsize * LINE_HEIGHT;
}
else
{
pdfioContentTextMoveTo(dd->st, lwidth, -fontsize * LINE_HEIGHT);
lwidth = 0.0;
}
}
}

Expand Down Expand Up @@ -539,7 +613,7 @@ main(int argc, // I - Number of command-line arguments
// Add fonts...
for (fontface = DOCFONT_REGULAR; fontface < DOCFONT_MAX; fontface ++)
{
if ((dd.fonts[fontface] = pdfioFileCreateFontObjFromFile(dd.pdf, docfont_filenames[fontface], /*unicode*/true)) == NULL)
if ((dd.fonts[fontface] = pdfioFileCreateFontObjFromFile(dd.pdf, docfont_filenames[fontface], UNICODE_VALUE)) == NULL)
return (1);
}

Expand Down

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