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Save work on image support.

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This commit is contained in:
Michael R Sweet
2024-12-11 15:37:03 -05:00
parent a39b01ec9c
commit dc65eb8d2f
2 changed files with 450 additions and 44 deletions
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259
examples/md2pdf.c
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@@ -20,6 +20,11 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef _WIN32
# include <io.h>
#else
# include <unistd.h>
#endif // _WIN32
#include "mmd.h"
#include <pdfio.h>
#include <pdfio-content.h>
@@ -55,6 +60,14 @@ typedef struct docimage_s // Document image info
#define DOCIMAGE_MAX 1000 // Maximum number of images
typedef struct doclink_s // Document link info
{
const char *url; // Reference URL
pdfio_rect_t box; // Link box
} doclink_t;
#define DOCLINK_MAX 1000 // Maximum number of links/page
typedef struct docdata_s // Document formatting data
{
pdfio_file_t *pdf; // PDF file
@@ -69,6 +82,9 @@ typedef struct docdata_s // Document formatting data
pdfio_stream_t *st; // Current page stream
double y; // Current position on page
doccolor_t color; // Current color
pdfio_obj_t *annots; // Annotations object (for links)
size_t num_links; // Number of links for this page
doclink_t links[DOCLINK_MAX]; // Links for this page
} docdata_t;
@@ -128,6 +144,90 @@ static const char * const docfont_names[] =
#define UNICODE_VALUE true // `true` for Unicode text, `false` for ISO-8859-1
//
// 'mmd_walk_next()' - Find the next markdown node.
//
static mmd_t * // O - Next node or `NULL` at end
mmd_walk_next(mmd_t *top, // I - Top node
mmd_t *node) // I - Current node
{
mmd_t *next, // Next node
*parent; // Parent node
// Figure out the next node under "top"...
if ((next = mmdGetFirstChild(node)) == NULL)
{
if ((next = mmdGetNextSibling(node)) == NULL)
{
if ((parent = mmdGetParent(node)) != top)
{
while ((next = mmdGetNextSibling(parent)) == NULL)
{
if ((parent = mmdGetParent(parent)) == top)
break;
}
}
}
}
return (next);
}
//
// 'add_images()' - Scan the markdown document for images.
//
static void
add_images(docdata_t *dd, // I - Document data
mmd_t *doc) // I - Markdown document
{
mmd_t *current, // Current node
*next; // Next node
// Scan the entire document for images...
for (current = mmdGetFirstChild(doc); current; current = next)
{
// Get next node
next = mmd_walk_next(doc, current);
// Look for image nodes...
if (mmdGetType(current) == MMD_TYPE_IMAGE)
{
const char *url, // URL for image
*ext; // Extension
url = mmdGetURL(current);
ext = strrchr(url, '.');
fprintf(stderr, "IMAGE(%s), ext=\"%s\"\n", url, ext);
if (!access(url, 0) && ext && (!strcmp(ext, ".png") || !strcmp(ext, ".jpg") || !strcmp(ext, ".jpeg")))
{
// Local JPEG or PNG file, so add it if we haven't already...
size_t i; // Looping var
for (i = 0; i < dd->num_images; i ++)
{
if (!strcmp(dd->images[i].url, url))
break;
}
if (i >= dd->num_images && dd->num_images < DOCIMAGE_MAX)
{
dd->images[i].url = url;
if ((dd->images[i].obj = pdfioFileCreateImageObjFromFile(dd->pdf, url, false)) != NULL)
dd->num_images ++;
}
}
}
}
}
//
// 'set_color()' - Set the stroke and fill color.
//
@@ -286,10 +386,13 @@ format_block(docdata_t *dd, // I - Document data
const char *curtext, // Current text
*cururl; // Current URL, if any
bool curws; // Current whitespace
pdfio_obj_t *curimage; // Current image, if any
char curimagename[32]; // Current image name
docfont_t curface, // Current font face
prevface; // Previous font face
double x, y; // Current position
double width, // Width of current fragment
height, // Height of current fragment
lwidth, // Leader width
wswidth; // Width of whitespace
doccolor_t color; // Color of text
@@ -327,34 +430,37 @@ format_block(docdata_t *dd, // I - Document data
for (current = mmdGetFirstChild(block), x = left; current; current = next)
{
// Get information about the current node...
curtype = mmdGetType(current);
curtext = mmdGetText(current);
cururl = mmdGetURL(current);
curws = mmdGetWhitespace(current);
// fprintf(stderr, "current=%p, curtype=%d, curtext=\"%s\", cururl=\"%s\", curws=%s\n", (void *)current, curtype, curtext, cururl, curws ? "true" : "false");
// Figure out the next node under this block...
if ((next = mmdGetFirstChild(current)) == NULL)
{
if ((next = mmdGetNextSibling(current)) == NULL)
{
mmd_t *parent; // Parent node
if ((parent = mmdGetParent(current)) != block)
{
while ((next = mmdGetNextSibling(parent)) == NULL)
{
if ((parent = mmdGetParent(parent)) == block)
break;
}
}
}
}
curtype = mmdGetType(current);
curtext = mmdGetText(current);
curimage = NULL;
curimagename[0] = '\0';
cururl = mmdGetURL(current);
curws = mmdGetWhitespace(current);
next = mmd_walk_next(block, current);
// Process the node...
if (!curtext)
if (curtype == MMD_TYPE_IMAGE && cururl)
{
// Embed an image
size_t i; // Looping var
for (i = 0; i < dd->num_images; i ++)
{
if (!strcmp(dd->images[i].url, cururl))
{
curimage = dd->images[i].obj;
snprintf(curimagename, sizeof(curimagename), "I%u", (unsigned)i);
break;
}
}
if (!curimage)
continue;
}
else if (!curtext)
{
continue;
}
if (curtype == MMD_TYPE_EMPHASIZED_TEXT)
curface = DOCFONT_ITALIC;
@@ -372,7 +478,52 @@ format_block(docdata_t *dd, // I - Document data
else
color = DOCCOLOR_BLACK;
width = pdfioContentTextMeasure(dd->fonts[curface], curtext, fontsize);
if (curimage)
{
// Image - treat as 100dpi
width = 72.0 * pdfioImageGetWidth(curimage) / 100.0;
height = 72.0 * pdfioImageGetHeight(curimage) / 100.0;
if (width > (right - left))
{
// Too wide, scale to width...
width = right - left;
height = width * pdfioImageGetHeight(curimage) / pdfioImageGetWidth(curimage);
}
else if (height > (dd->art_box.y2 - dd->art_box.y1))
{
// Too tall, scale to height...
height = dd->art_box.y2 - dd->art_box.y1;
width = height * pdfioImageGetWidth(curimage) / pdfioImageGetHeight(curimage);
}
if (x <= left)
{
y -= height - fontsize * LINE_HEIGHT;
if (prevface != DOCFONT_MAX)
{
pdfioContentTextEnd(dd->st);
prevface = DOCFONT_MAX;
}
if (y < dd->art_box.y1)
{
// New page...
new_page(dd);
x = left;
y = dd->y - height;
}
}
}
else
{
// Text fragment...
width = pdfioContentTextMeasure(dd->fonts[curface], curtext, fontsize);
height = fontsize * LINE_HEIGHT;
}
if (curws)
wswidth = pdfioContentTextMeasure(dd->fonts[curface], " ", fontsize);
else
@@ -382,7 +533,7 @@ format_block(docdata_t *dd, // I - Document data
{
// New line...
x = left;
y -= fontsize * LINE_HEIGHT;
y -= height;
if (y < dd->art_box.y1)
{
@@ -395,7 +546,7 @@ format_block(docdata_t *dd, // I - Document data
new_page(dd);
y = dd->y - fontsize * LINE_HEIGHT;
y = dd->y - height;
}
else
{
@@ -404,29 +555,46 @@ format_block(docdata_t *dd, // I - Document data
}
}
if (curface != prevface)
fprintf(stderr, "curtext=\"%s\", curimage=\"%s\", x=%g, y=%g, width=%g, height=%g\n", curtext, curimagename, x, y, width, height);
if (curimage)
{
if (prevface == DOCFONT_MAX)
// Image
if (prevface != DOCFONT_MAX)
{
pdfioContentTextBegin(dd->st);
pdfioContentTextMoveTo(dd->st, x, y);
pdfioContentTextEnd(dd->st);
prevface = DOCFONT_MAX;
}
pdfioContentSetTextFont(dd->st, docfont_names[prevface = curface], fontsize);
}
if (color != dd->color)
set_color(dd, color);
if (x > left && curws)
{
pdfioContentTextShowf(dd->st, UNICODE_VALUE, " %s", curtext);
x += width + wswidth;
pdfioContentDrawImage(dd->st, curimagename, x, y, width, height);
}
else
{
pdfioContentTextShow(dd->st, UNICODE_VALUE, curtext);
x += width;
// Text
if (curface != prevface)
{
if (prevface == DOCFONT_MAX)
{
pdfioContentTextBegin(dd->st);
pdfioContentTextMoveTo(dd->st, x, y);
}
pdfioContentSetTextFont(dd->st, docfont_names[prevface = curface], fontsize);
}
if (color != dd->color)
set_color(dd, color);
if (x > left && curws)
{
pdfioContentTextShowf(dd->st, UNICODE_VALUE, " %s", curtext);
x += width + wswidth;
}
else
{
pdfioContentTextShow(dd->st, UNICODE_VALUE, curtext);
x += width;
}
}
if (blocktype == MMD_TYPE_CODE_BLOCK)
@@ -632,6 +800,9 @@ main(int argc, // I - Number of command-line arguments
return (1);
}
// Add images...
add_images(&dd, doc);
// Parse the markdown document...
format_doc(&dd, doc, dd.art_box.x1, dd.art_box.x2);