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Printing: use pango markup for text generation

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This gets us text wrapping etc.  I think I have some serious memory leak
somewhere, though, because if I print out all my dives it eventually
ends up with broken dives and doesn't complete.  But I am going to
commit this as a "it kind of works" point.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds 2011-09-20 22:09:38 -07:00
parent d8d631aa84
commit 3fd66cc69b
1 changed files with 88 additions and 36 deletions
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124
print.c
View file

@ -7,55 +7,101 @@
#include "display.h"
#include "display-gtk.h"
static void show_text(cairo_t *cr, int size, double x, double y, const char *fmt, ...)
/* Why doesn't pango/gtk have these quoting functions? */
static inline int add_char(char *buffer, size_t size, int len, char c)
{
va_list args;
char buffer[256], *p;
if (len < size)
buffer[len++] = c;
return len;
}
va_start(args, fmt);
vsnprintf(buffer, sizeof(buffer), fmt, args);
va_end(args);
/* Add an escape string "atomically" - all or nothing */
static int add_str(char *buffer, size_t size, int len, const char *s)
{
int oldlen = len;
char c;
while ((c = *s++) != 0) {
if (len >= size)
return oldlen;
buffer[len++] = c;
}
return len;
}
cairo_set_font_size(cr, size);
static int add_quoted_string(char *buffer, size_t size, int len, const char *s)
{
if (!s)
return len;
p = buffer;
do {
char *n = strchr(p, '\n');
if (n)
*n++ = 0;
cairo_move_to(cr, x, y);
cairo_show_text(cr, p);
p = n;
y += size;
} while (p);
/* Room for '\0' */
size--;
for (;;) {
const char *escape;
unsigned char c = *s++;
switch(c) {
default:
len = add_char(buffer, size, len, c);
continue;
case 0:
escape = "\n";
break;
case '&':
escape = "&amp;";
break;
case '>':
escape = "&gt;";
break;
case '<':
escape = "&lt;";
break;
}
len = add_str(buffer, size, len, escape);
if (c)
continue;
buffer[len] = 0;
return len;
}
}
/*
* You know what? Maybe somebody can do a real Pango layout thing.
*
* I'm going to do this with the cairo engine instead. I can only learn so
* many new interfaces.
* This is hacky.
*/
static void show_dive_text(struct dive *dive, cairo_t *cr, double w, double h)
{
int len;
PangoLayout *layout;
struct tm *tm;
char buffer[1024], divenr[20];
layout = pango_cairo_create_layout(cr);
pango_layout_set_width(layout, w * PANGO_SCALE);
pango_layout_set_height(layout, h * PANGO_SCALE * 0.9);
pango_layout_set_wrap(layout, PANGO_WRAP_WORD_CHAR);
*divenr = 0;
if (dive->number)
snprintf(divenr, sizeof(divenr), "Dive #%d - ", dive->number);
tm = gmtime(&dive->when);
show_text(cr, 16, 0, 2, "Dive #%d - %s, %s %d, %d %d:%02d",
dive->number,
len = snprintf(buffer, sizeof(buffer),
"<span size=\"large\">%s%s, %s %d, %d %d:%02d</span>\n",
divenr,
weekday(tm->tm_wday),
monthname(tm->tm_mon),
tm->tm_mday, tm->tm_year + 1900,
tm->tm_hour, tm->tm_min);
show_text(cr, 10, w*0.6, 0,
"Max depth: %d ft\nDuration: %d:%02d",
to_feet(dive->maxdepth),
dive->duration.seconds / 60,
dive->duration.seconds % 60);
len = add_quoted_string(buffer, sizeof(buffer), len, dive->location);
len = add_quoted_string(buffer, sizeof(buffer), len, dive->notes);
show_text(cr, 10, 0, 20, "%s", dive->location ?: "");
show_text(cr, 10, 0, 30, "%s", dive->notes ?: "");
pango_layout_set_markup(layout, buffer, -1);
cairo_move_to(cr, 0, 0);
pango_cairo_show_layout(cr, layout);
g_object_unref(layout);
}
static void show_dive_profile(struct dive *dive, cairo_t *cr, double w, double h)
@ -77,15 +123,20 @@ static void print(int divenr, cairo_t *cr, double x, double y, double w, double
cairo_save(cr);
cairo_translate(cr, x, y);
/* Plus 5% on all sides */
cairo_translate(cr, w/20, h/20);
w *= 0.9; h *= 0.9;
/* We actually want to scale the text and the lines now */
cairo_scale(cr, 0.5, 0.5);
/* Dive plot in the upper 75% - note the scaling */
show_dive_profile(dive, cr, w*2, h*1.5);
/* Dive plot in the upper two thirds - note the scaling */
show_dive_profile(dive, cr, w*2, h*1.33);
/* Dive information in the lower 25% */
cairo_translate(cr, 0, h*1.5);
show_dive_text(dive, cr, w*2, h*0.5);
/* Dive information in the lower third */
cairo_translate(cr, 0, h*1.33);
show_dive_text(dive, cr, w*2, h*0.67);
cairo_restore(cr);
}
@ -109,8 +160,8 @@ static void draw_page(GtkPrintOperation *operation,
print(nr+1, cr, w, 0, w, h);
print(nr+2, cr, 0, h, w, h);
print(nr+3, cr, w, h, w, h);
print(nr+2, cr, 0, 2*h, w, h);
print(nr+3, cr, w, 2*h, w, h);
print(nr+4, cr, 0, 2*h, w, h);
print(nr+5, cr, w, 2*h, w, h);
}
static void begin_print(GtkPrintOperation *operation, gpointer user_data)
@ -125,6 +176,7 @@ void do_print(void)
GtkPrintOperation *print;
GtkPrintOperationResult res;
repaint_dive();
print = gtk_print_operation_new();
if (settings != NULL)
gtk_print_operation_set_print_settings(print, settings);