mirror of
https://github.com/michaelrsweet/pdfio.git
synced 2024-12-26 05:18:21 +01:00
Refactor block formatter to split content into lines and render the lines.
Also cache the current font for the whole page.
This commit is contained in:
Michael R Sweet
parent
dc65eb8d2f
commit
72e55b5bd1
@ -20,6 +20,7 @@
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <math.h>
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#ifdef _WIN32
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# include <io.h>
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#else
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@ -81,12 +82,28 @@ typedef struct docdata_s // Document formatting data
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char *heading; // Current document heading
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pdfio_stream_t *st; // Current page stream
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double y; // Current position on page
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docfont_t font; // Current font
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double fsize; // Current font size
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doccolor_t color; // Current color
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pdfio_obj_t *annots; // Annotations object (for links)
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size_t num_links; // Number of links for this page
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doclink_t links[DOCLINK_MAX]; // Links for this page
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} docdata_t;
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typedef struct linefrag_s // Line fragment
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{
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double x, // X position of item
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width, // Width of item
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height; // Height of item
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size_t imagenum; // Image number
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const char *text; // Text string
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bool ws; // Whitespace before text?
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docfont_t font; // Text font
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doccolor_t color; // Text color
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} linefrag_t;
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#define LINEFRAG_MAX 200 // Maximum number of fragments on a line
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//
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// Macros...
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@ -229,13 +246,16 @@ add_images(docdata_t *dd, // I - Document data
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//
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// 'set_color()' - Set the stroke and fill color.
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// 'set_color()' - Set the stroke and fill color as needed.
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//
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static void
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set_color(docdata_t *dd, // I - Document data
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doccolor_t color) // I - Document color
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{
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if (color == dd->color)
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return;
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switch (color)
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{
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case DOCCOLOR_BLACK :
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@ -264,6 +284,28 @@ set_color(docdata_t *dd, // I - Document data
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}
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//
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// 'set_font()' - Set the font typeface and size as needed.
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//
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static void
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set_font(docdata_t *dd, // I - Document data
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docfont_t font, // I - Font
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double fsize) // I - Font size
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{
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if (font == dd->font && fabs(fsize - dd->fsize) < 0.1)
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return;
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if (font == DOCFONT_MAX)
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return;
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pdfioContentSetTextFont(dd->st, docfont_names[font], fsize);
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dd->font = font;
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dd->fsize = fsize;
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}
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//
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// 'new_page()' - Start a new page.
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//
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@ -298,10 +340,14 @@ new_page(docdata_t *dd) // I - Document data
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}
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dd->st = pdfioFileCreatePage(dd->pdf, page_dict);
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dd->color = DOCCOLOR_BLACK;
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dd->font = DOCFONT_MAX;
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dd->fsize = 0.0;
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dd->y = dd->art_box.y2;
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// Add header/footer text
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set_color(dd, DOCCOLOR_GRAY);
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pdfioContentSetTextFont(dd->st, docfont_names[DOCFONT_REGULAR], SIZE_HEADFOOT);
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set_font(dd, DOCFONT_REGULAR, SIZE_HEADFOOT);
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if (pdfioFileGetNumPages(dd->pdf) > 1 && dd->title)
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{
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@ -358,11 +404,81 @@ new_page(docdata_t *dd) // I - Document data
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pdfioContentTextShow(dd->st, UNICODE_VALUE, dd->heading);
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pdfioContentTextEnd(dd->st);
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}
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}
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// The rest of the text will be full black...
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set_color(dd, DOCCOLOR_BLACK);
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dd->y = dd->art_box.y2;
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//
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// 'render_line()' - Render a line of text/graphics.
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//
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static void
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render_line(docdata_t *dd, // I - Document data
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double margin_top, // I - Top margin
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double lineheight, // I - Height of line
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size_t num_frags, // I - Number of line fragments
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linefrag_t *frags) // I - Line fragments
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{
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size_t i; // Looping var
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linefrag_t *frag; // Current line fragment
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bool in_text = false; // Are we in a text block?
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if (!dd->st)
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new_page(dd);
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dd->y -= margin_top + lineheight;
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if (dd->y < dd->art_box.y1)
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{
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new_page(dd);
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dd->y -= lineheight;
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}
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fprintf(stderr, "num_frags=%u, y=%g\n", (unsigned)num_frags, dd->y);
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for (i = 0, frag = frags; i < num_frags; i ++, frag ++)
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{
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if (frag->text)
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{
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// Draw text
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fprintf(stderr, " text=\"%s\", font=%d, color=%d, x=%g\n", frag->text, frag->font, frag->color, frag->x);
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set_color(dd, frag->color);
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set_font(dd, frag->font, frag->height);
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if (!in_text)
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{
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pdfioContentTextBegin(dd->st);
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pdfioContentTextMoveTo(dd->st, frag->x, dd->y);
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in_text = true;
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}
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if (frag->ws)
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pdfioContentTextShowf(dd->st, UNICODE_VALUE, " %s", frag->text);
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else
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pdfioContentTextShow(dd->st, UNICODE_VALUE, frag->text);
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}
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else
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{
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// Draw image
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char imagename[32]; // Current image name
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fprintf(stderr, " imagenum=%u, x=%g, width=%g, height=%g\n", (unsigned)frag->imagenum, frag->x, frag->width, frag->height);
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if (in_text)
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{
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pdfioContentTextEnd(dd->st);
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in_text = false;
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}
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snprintf(imagename, sizeof(imagename), "I%u", (unsigned)frag->imagenum);
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pdfioContentDrawImage(dd->st, imagename, frag->x, dd->y, frag->width, frag->height);
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}
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}
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if (in_text)
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pdfioContentTextEnd(dd->st);
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}
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@ -373,8 +489,8 @@ new_page(docdata_t *dd) // I - Document data
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static void
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format_block(docdata_t *dd, // I - Document data
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mmd_t *block, // I - Block to format
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docfont_t fontface, // I - Default font
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double fontsize, // I - Size of font
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docfont_t deffont, // I - Default font
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double fsize, // I - Size of font
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double left, // I - Left margin
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double right, // I - Right margin
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const char *leader) // I - Leader text on the first line
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@ -382,253 +498,165 @@ format_block(docdata_t *dd, // I - Document data
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mmd_type_t blocktype; // Block type
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mmd_t *current, // Current node
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*next; // Next node
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mmd_type_t curtype; // Current node type
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const char *curtext, // Current text
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*cururl; // Current URL, if any
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bool curws; // Current whitespace
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pdfio_obj_t *curimage; // Current image, if any
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char curimagename[32]; // Current image name
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docfont_t curface, // Current font face
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prevface; // Previous font face
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double x, y; // Current position
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double width, // Width of current fragment
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size_t num_frags; // Number of line fragments
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linefrag_t frags[LINEFRAG_MAX], // Line fragments
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*frag; // Current fragment
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mmd_type_t type; // Current node type
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const char *text, // Current text
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*url; // Current URL, if any
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bool ws; // Current whitespace
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pdfio_obj_t *image; // Current image, if any
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size_t imagenum; // Current image number
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doccolor_t color = DOCCOLOR_BLACK; // Current text color
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docfont_t font = deffont; // Current text font
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double x, // Current position
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width, // Width of current fragment
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wswidth, // Width of whitespace
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margin_top, // Top margin
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height, // Height of current fragment
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lwidth, // Leader width
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wswidth; // Width of whitespace
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doccolor_t color; // Color of text
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lineheight; // Height of current line
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blocktype = mmdGetType(block);
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if (!dd->st)
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new_page(dd);
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if ((y = dd->y - 2.0 * fontsize * LINE_HEIGHT) < dd->art_box.y1)
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{
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new_page(dd);
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y = dd->y - fontsize;
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}
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margin_top = fsize * LINE_HEIGHT;
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if (leader)
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{
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// Add leader text on first line...
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pdfioContentSetTextFont(dd->st, docfont_names[prevface = fontface], fontsize);
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frags[0].width = pdfioContentTextMeasure(dd->fonts[deffont], leader, fsize);
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frags[0].height = fsize;
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frags[0].x = left - frags[0].width;
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frags[0].text = leader;
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frags[0].font = deffont;
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frags[0].color = DOCCOLOR_BLACK;
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lwidth = pdfioContentTextMeasure(dd->fonts[fontface], leader, fontsize);
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pdfioContentTextBegin(dd->st);
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pdfioContentTextMoveTo(dd->st, left - lwidth, y);
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pdfioContentTextShow(dd->st, UNICODE_VALUE, leader);
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num_frags = 1;
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lineheight = fsize * LINE_HEIGHT;
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}
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else
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{
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// No leader text...
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prevface = DOCFONT_MAX;
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lwidth = 0.0;
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num_frags = 0;
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lineheight = 0.0;
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}
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frag = frags + num_frags;
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// Loop through the block and render lines...
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for (current = mmdGetFirstChild(block), x = left; current; current = next)
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{
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// Get information about the current node...
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curtype = mmdGetType(current);
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curtext = mmdGetText(current);
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curimage = NULL;
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curimagename[0] = '\0';
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cururl = mmdGetURL(current);
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curws = mmdGetWhitespace(current);
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type = mmdGetType(current);
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text = mmdGetText(current);
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image = NULL;
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imagenum = 0;
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url = mmdGetURL(current);
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ws = mmdGetWhitespace(current);
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wswidth = 0.0;
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next = mmd_walk_next(block, current);
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// Process the node...
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if (curtype == MMD_TYPE_IMAGE && cururl)
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if (type == MMD_TYPE_IMAGE && url)
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{
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// Embed an image
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size_t i; // Looping var
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for (i = 0; i < dd->num_images; i ++)
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{
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if (!strcmp(dd->images[i].url, cururl))
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if (!strcmp(dd->images[i].url, url))
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{
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curimage = dd->images[i].obj;
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snprintf(curimagename, sizeof(curimagename), "I%u", (unsigned)i);
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image = dd->images[i].obj;
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imagenum = i;
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break;
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}
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}
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if (!curimage)
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if (!image)
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continue;
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}
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else if (!curtext)
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{
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continue;
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}
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if (curtype == MMD_TYPE_EMPHASIZED_TEXT)
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curface = DOCFONT_ITALIC;
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else if (curtype == MMD_TYPE_STRONG_TEXT)
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curface = DOCFONT_BOLD;
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else if (curtype == MMD_TYPE_CODE_TEXT)
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curface = DOCFONT_MONOSPACE;
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else
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curface = fontface;
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if (curtype == MMD_TYPE_CODE_TEXT)
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color = DOCCOLOR_RED;
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else if (curtype == MMD_TYPE_LINKED_TEXT)
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color = DOCCOLOR_BLUE;
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else
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color = DOCCOLOR_BLACK;
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if (curimage)
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{
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// Image - treat as 100dpi
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width = 72.0 * pdfioImageGetWidth(curimage) / 100.0;
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height = 72.0 * pdfioImageGetHeight(curimage) / 100.0;
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width = 72.0 * pdfioImageGetWidth(image) / 100.0;
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height = 72.0 * pdfioImageGetHeight(image) / 100.0;
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text = NULL;
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if (width > (right - left))
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{
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// Too wide, scale to width...
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width = right - left;
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height = width * pdfioImageGetHeight(curimage) / pdfioImageGetWidth(curimage);
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height = width * pdfioImageGetHeight(image) / pdfioImageGetWidth(image);
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}
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else if (height > (dd->art_box.y2 - dd->art_box.y1))
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{
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// Too tall, scale to height...
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height = dd->art_box.y2 - dd->art_box.y1;
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width = height * pdfioImageGetWidth(curimage) / pdfioImageGetHeight(curimage);
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width = height * pdfioImageGetWidth(image) / pdfioImageGetHeight(image);
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}
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if (x <= left)
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}
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else if (!text)
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{
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y -= height - fontsize * LINE_HEIGHT;
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if (prevface != DOCFONT_MAX)
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{
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pdfioContentTextEnd(dd->st);
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prevface = DOCFONT_MAX;
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}
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if (y < dd->art_box.y1)
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{
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// New page...
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new_page(dd);
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x = left;
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y = dd->y - height;
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}
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}
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continue;
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}
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else
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{
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// Text fragment...
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width = pdfioContentTextMeasure(dd->fonts[curface], curtext, fontsize);
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height = fontsize * LINE_HEIGHT;
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if (type == MMD_TYPE_EMPHASIZED_TEXT)
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font = DOCFONT_ITALIC;
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else if (type == MMD_TYPE_STRONG_TEXT)
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font = DOCFONT_BOLD;
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else if (type == MMD_TYPE_CODE_TEXT)
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font = DOCFONT_MONOSPACE;
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else
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font = deffont;
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if (type == MMD_TYPE_CODE_TEXT)
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color = DOCCOLOR_RED;
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else if (type == MMD_TYPE_LINKED_TEXT)
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color = DOCCOLOR_BLUE;
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else
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color = DOCCOLOR_BLACK;
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width = pdfioContentTextMeasure(dd->fonts[font], text, fsize);
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height = fsize * LINE_HEIGHT;
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if (ws)
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wswidth = pdfioContentTextMeasure(dd->fonts[font], " ", fsize);
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}
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if (curws)
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wswidth = pdfioContentTextMeasure(dd->fonts[curface], " ", fontsize);
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else
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// See if this node will fit on the current line...
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if ((num_frags > 0 && (x + width + wswidth) >= right) || num_frags == LINEFRAG_MAX)
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{
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// No, render this line and start over...
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render_line(dd, margin_top, lineheight, num_frags, frags);
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num_frags = 0;
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frag = frags;
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x = left;
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lineheight = 0.0;
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margin_top = 0.0;
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}
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// Add the current node to the fragment list
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if (num_frags == 0)
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wswidth = 0.0;
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if (x > left && (x + width + wswidth) >= right)
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{
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// New line...
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x = left;
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y -= height;
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frag->x = x;
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frag->width = width + wswidth;
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frag->height = text ? fsize : height;
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frag->imagenum = imagenum;
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frag->text = text;
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frag->ws = ws;
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frag->font = font;
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frag->color = color;
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if (y < dd->art_box.y1)
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{
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// New page...
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if (prevface != DOCFONT_MAX)
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{
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pdfioContentTextEnd(dd->st);
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prevface = DOCFONT_MAX;
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}
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new_page(dd);
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y = dd->y - height;
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}
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else
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{
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pdfioContentTextMoveTo(dd->st, lwidth, -fontsize * LINE_HEIGHT);
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lwidth = 0.0;
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}
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}
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fprintf(stderr, "curtext=\"%s\", curimage=\"%s\", x=%g, y=%g, width=%g, height=%g\n", curtext, curimagename, x, y, width, height);
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if (curimage)
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{
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// Image
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if (prevface != DOCFONT_MAX)
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{
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pdfioContentTextEnd(dd->st);
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prevface = DOCFONT_MAX;
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}
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pdfioContentDrawImage(dd->st, curimagename, x, y, width, height);
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}
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else
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{
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// Text
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if (curface != prevface)
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{
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if (prevface == DOCFONT_MAX)
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{
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pdfioContentTextBegin(dd->st);
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pdfioContentTextMoveTo(dd->st, x, y);
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}
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|
||||
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);
|
||||
num_frags ++;
|
||||
frag ++;
|
||||
x += width + wswidth;
|
||||
}
|
||||
else
|
||||
{
|
||||
pdfioContentTextShow(dd->st, UNICODE_VALUE, curtext);
|
||||
x += width;
|
||||
}
|
||||
if (height > lineheight)
|
||||
lineheight = height;
|
||||
}
|
||||
|
||||
if (blocktype == MMD_TYPE_CODE_BLOCK)
|
||||
{
|
||||
// Force a new line...
|
||||
x = left;
|
||||
y -= fontsize * LINE_HEIGHT;
|
||||
|
||||
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;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// End the current text block and save out position on the page...
|
||||
if (prevface != DOCFONT_MAX)
|
||||
pdfioContentTextEnd(dd->st);
|
||||
|
||||
dd->y = y;
|
||||
if (num_frags > 0)
|
||||
render_line(dd, margin_top, lineheight, num_frags, frags);
|
||||
}
|
||||
|
||||
|
||||
@ -707,7 +735,29 @@ format_doc(docdata_t *dd, // I - Document data
|
||||
break;
|
||||
|
||||
case MMD_TYPE_CODE_BLOCK :
|
||||
format_block(dd, current, DOCFONT_MONOSPACE, SIZE_BODY, left + 36.0, right, /*leader*/NULL);
|
||||
{
|
||||
mmd_t *code; // Current code block
|
||||
linefrag_t frag; // Line fragment
|
||||
double margin_top; // Top margin
|
||||
|
||||
frag.x = left + 36.0;
|
||||
frag.width = 0.0;
|
||||
frag.height = SIZE_CODEBLOCK;
|
||||
frag.imagenum = 0;
|
||||
frag.ws = false;
|
||||
frag.font = DOCFONT_MONOSPACE;
|
||||
frag.color = DOCCOLOR_RED;
|
||||
margin_top = SIZE_CODEBLOCK * LINE_HEIGHT;
|
||||
|
||||
for (code = mmdGetFirstChild(current); code; code = mmdGetNextSibling(code))
|
||||
{
|
||||
frag.text = mmdGetText(code);
|
||||
|
||||
render_line(dd, margin_top, SIZE_CODEBLOCK * LINE_HEIGHT, 1, &frag);
|
||||
|
||||
margin_top = 0.0;
|
||||
}
|
||||
}
|
||||
break;
|
||||
}
|
||||
}
|
||||
@ -743,6 +793,8 @@ main(int argc, // I - Number of command-line arguments
|
||||
const char *value; // Metadata value
|
||||
|
||||
|
||||
setbuf(stderr, NULL);
|
||||
|
||||
// Get the markdown file from the command-line...
|
||||
if (argc != 2)
|
||||
{
|
||||
|
||||
Loading…
Reference in New Issue
Block a user