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netsurf/gtk/font_pango.c
Daniel Silverstone 6807b4208a Remove the netsurf/ from the include paths and rationalise use of <> vs "" in includes 
NetSurf includes are now done with ""s and other system includes with <>s as C intended.
The scandeps tool has been updated to only look for ""ed includes, and to verify that the
files exist in the tree before adding them to the dependency lines. The depend rule has
therefore been augmented to make sure the autogenerated files are built before it is run.

This is untested under self-hosted RISC OS builds. All else tested and works.


svn path=/trunk/netsurf/; revision=3307
2007-05-30 22:39:54 +00:00

338 lines
8.8 KiB
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/*
* This file is part of NetSurf, http://netsurf-browser.org/
* Licensed under the GNU General Public License,
* http://www.opensource.org/licenses/gpl-license
* Copyright 2005 James Bursa <bursa@users.sourceforge.net>
*/
/** \file
* Font handling (GTK implementation).
*
* Pango is used handle and render fonts.
*/
#include <assert.h>
#include <stdio.h>
#include <gtk/gtk.h>
#include "css/css.h"
#include "gtk/font_pango.h"
#include "gtk/gtk_plotters.h"
#include "render/font.h"
#include "utils/utils.h"
#include "utils/log.h"
#include "desktop/options.h"
/* Until we can consider the descenders etc, we need to not render using cairo */
#undef CAIRO_VERSION
static PangoFontDescription *nsfont_style_to_description(
const struct css_style *style);
/**
* Measure the width of a string.
*
* \param style css_style for this text, with style->font_size.size ==
* CSS_FONT_SIZE_LENGTH
* \param string UTF-8 string to measure
* \param length length of string
* \param width updated to width of string[0..length)
* \return true on success, false on error and error reported
*/
bool nsfont_width(const struct css_style *style,
const char *string, size_t length,
int *width)
{
PangoFontDescription *desc;
PangoContext *context;
PangoLayout *layout;
if (length == 0) {
*width = 0;
return true;
}
desc = nsfont_style_to_description(style);
context = gdk_pango_context_get();
layout = pango_layout_new(context);
pango_layout_set_font_description(layout, desc);
pango_layout_set_text(layout, string, length);
pango_layout_get_pixel_size(layout, width, 0);
g_object_unref(layout);
g_object_unref(context);
pango_font_description_free(desc);
return true;
}
/**
* Find the position in a string where an x coordinate falls.
*
* \param style css_style for this text, with style->font_size.size ==
* CSS_FONT_SIZE_LENGTH
* \param string UTF-8 string to measure
* \param length length of string
* \param x x coordinate to search for
* \param char_offset updated to offset in string of actual_x, [0..length]
* \param actual_x updated to x coordinate of character closest to x
* \return true on success, false on error and error reported
*/
bool nsfont_position_in_string(const struct css_style *style,
const char *string, size_t length,
int x, size_t *char_offset, int *actual_x)
{
int index;
PangoFontDescription *desc;
PangoContext *context;
PangoLayout *layout;
PangoRectangle pos;
desc = nsfont_style_to_description(style);
context = gdk_pango_context_get();
layout = pango_layout_new(context);
pango_layout_set_font_description(layout, desc);
pango_layout_set_text(layout, string, length);
pango_layout_xy_to_index(layout, x * PANGO_SCALE, 0, &index, 0);
pango_layout_index_to_pos(layout, index, &pos);
g_object_unref(layout);
g_object_unref(context);
pango_font_description_free(desc);
*char_offset = index?index+1:0;
*actual_x = PANGO_PIXELS(pos.x);
return true;
}
/**
* Find where to split a string to make it fit a width.
*
* \param style css_style for this text, with style->font_size.size ==
* CSS_FONT_SIZE_LENGTH
* \param string UTF-8 string to measure
* \param length length of string
* \param x width available
* \param char_offset updated to offset in string of actual_x, [0..length]
* \param actual_x updated to x coordinate of character closest to x
* \return true on success, false on error and error reported
*
* On exit, [char_offset == 0 ||
* string[char_offset] == ' ' ||
* char_offset == length]
*/
bool nsfont_split(const struct css_style *style,
const char *string, size_t length,
int x, size_t *char_offset, int *actual_x)
{
int index = length;
PangoFontDescription *desc;
PangoContext *context;
PangoLayout *layout;
PangoLayoutLine *line;
PangoLayoutIter *iter;
PangoRectangle rect;
desc = nsfont_style_to_description(style);
context = gdk_pango_context_get();
layout = pango_layout_new(context);
pango_layout_set_font_description(layout, desc);
pango_layout_set_text(layout, string, length);
pango_layout_set_width(layout, x * PANGO_SCALE);
pango_layout_set_wrap(layout, PANGO_WRAP_WORD);
line = pango_layout_get_line(layout, 1);
if (line)
index = line->start_index - 1;
iter = pango_layout_get_iter(layout);
pango_layout_iter_get_line_extents(iter, NULL, &rect);
pango_layout_iter_free(iter);
g_object_unref(layout);
g_object_unref(context);
pango_font_description_free(desc);
*char_offset = index;
*actual_x = PANGO_PIXELS(rect.width);
return true;
}
/**
* Render a string.
*
* \param style css_style for this text, with style->font_size.size ==
* CSS_FONT_SIZE_LENGTH
* \param string UTF-8 string to measure
* \param length length of string
* \param x x coordinate
* \param y y coordinate
* \param c colour for text
* \return true on success, false on error and error reported
*/
bool nsfont_paint(const struct css_style *style,
const char *string, size_t length,
int x, int y, colour c)
{
PangoFontDescription *desc;
PangoLayout *layout;
gint size;
#ifdef CAIRO_VERSION
int width, height;
#else
PangoLayoutLine *line;
PangoContext *context;
GdkColor colour = { 0,
((c & 0xff) << 8) | (c & 0xff),
(c & 0xff00) | (c & 0xff00 >> 8),
((c & 0xff0000) >> 8) | (c & 0xff0000 >> 16) };
#endif
if (length == 0)
return true;
desc = nsfont_style_to_description(style);
size = (gint)((double)pango_font_description_get_size(desc) * nsgtk_plot_get_scale());
if (pango_font_description_get_size_is_absolute(desc))
pango_font_description_set_absolute_size(desc, size);
else
pango_font_description_set_size(desc, size);
#ifdef CAIRO_VERSION
layout = pango_cairo_create_layout(current_cr);
#else
context = gdk_pango_context_get();
layout = pango_layout_new(context);
#endif
pango_layout_set_font_description(layout, desc);
pango_layout_set_text(layout, string, length);
#ifdef CAIRO_VERSION
pango_layout_get_pixel_size(layout, &width, &height);
cairo_move_to(current_cr, x, y - height);
nsgtk_set_colour(c);
pango_cairo_show_layout(current_cr, layout);
#else
line = pango_layout_get_line(layout, 0);
gdk_draw_layout_line_with_colors(current_drawable, current_gc,
x, y, line, &colour, 0);
g_object_unref(context);
#endif
g_object_unref(layout);
pango_font_description_free(desc);
return true;
}
/**
* Convert a css_style to a PangoFontDescription.
*
* \param style css_style for this text, with style->font_size.size ==
* CSS_FONT_SIZE_LENGTH
* \return a new Pango font description
*/
PangoFontDescription *nsfont_style_to_description(
const struct css_style *style)
{
unsigned int size;
PangoFontDescription *desc;
PangoWeight weight = PANGO_WEIGHT_NORMAL;
PangoStyle styl = PANGO_STYLE_NORMAL;
assert(style->font_size.size == CSS_FONT_SIZE_LENGTH);
switch (style->font_family) {
case CSS_FONT_FAMILY_SERIF:
desc = pango_font_description_from_string(option_font_serif);
break;
case CSS_FONT_FAMILY_MONOSPACE:
desc = pango_font_description_from_string(option_font_mono);
break;
case CSS_FONT_FAMILY_CURSIVE:
desc = pango_font_description_from_string(option_font_cursive);
break;
case CSS_FONT_FAMILY_FANTASY:
desc = pango_font_description_from_string(option_font_fantasy);
break;
case CSS_FONT_FAMILY_SANS_SERIF:
default:
desc = pango_font_description_from_string(option_font_sans);
break;
}
if (style->font_size.value.length.unit == CSS_UNIT_PX)
size = style->font_size.value.length.value;
else
size = css_len2pt(&style->font_size.value.length, style);
if (size < abs(option_font_min_size / 10))
size = option_font_min_size / 10;
size *= PANGO_SCALE;
switch (style->font_style) {
case CSS_FONT_STYLE_ITALIC:
styl = PANGO_STYLE_ITALIC;
break;
case CSS_FONT_STYLE_OBLIQUE:
styl = PANGO_STYLE_OBLIQUE;
break;
default:
break;
}
pango_font_description_set_style(desc, styl);
switch (style->font_weight) {
case CSS_FONT_WEIGHT_NORMAL:
weight = PANGO_WEIGHT_NORMAL; break;
case CSS_FONT_WEIGHT_BOLD:
weight = PANGO_WEIGHT_BOLD; break;
case CSS_FONT_WEIGHT_100: weight = 100; break;
case CSS_FONT_WEIGHT_200: weight = 200; break;
case CSS_FONT_WEIGHT_300: weight = 300; break;
case CSS_FONT_WEIGHT_400: weight = 400; break;
case CSS_FONT_WEIGHT_500: weight = 500; break;
case CSS_FONT_WEIGHT_600: weight = 600; break;
case CSS_FONT_WEIGHT_700: weight = 700; break;
case CSS_FONT_WEIGHT_800: weight = 800; break;
case CSS_FONT_WEIGHT_900: weight = 900; break;
default: break;
}
pango_font_description_set_weight(desc, weight);
if (style->font_size.value.length.unit == CSS_UNIT_PX)
pango_font_description_set_absolute_size(desc, size);
else
pango_font_description_set_size(desc, size);
switch (style->font_variant) {
case CSS_FONT_VARIANT_SMALL_CAPS:
pango_font_description_set_variant(desc, PANGO_VARIANT_SMALL_CAPS);
break;
case CSS_FONT_VARIANT_NORMAL:
default:
pango_font_description_set_variant(desc, PANGO_VARIANT_NORMAL);
}
return desc;
}
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