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netsurf/beos/beos_font.cpp

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/*
* Copyright 2005 James Bursa <bursa@users.sourceforge.net>
*
* This file is part of NetSurf, http://www.netsurf-browser.org/
*
* NetSurf is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* NetSurf is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/** \file
* Font handling (BeOS implementation).
* TODO: check for correctness, the code is taken from the GTK one.
* maybe use the current view instead of constructing a new BFont each time ?
*/
#include <stdbool.h>
#include <assert.h>
#include <stdio.h>
#include <Font.h>
#include <String.h>
#include <View.h>
extern "C" {
#include "css/css.h"
#include "render/font.h"
#include "utils/utils.h"
#include "utils/log.h"
#include "desktop/options.h"
}
#include "beos/beos_gui.h"
#include "beos/beos_font.h"
#include "beos/beos_plotters.h"
static void nsfont_style_to_font(BFont &font,
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)
{
//fprintf(stderr, "%s(, '%s', %d, )\n", __FUNCTION__, string, length);
BFont font;
#if 0 /* GTK */
PangoContext *context;
PangoLayout *layout;
#endif
if (length == 0) {
*width = 0;
return true;
}
nsfont_style_to_font(font, style);
*width = (int)font.StringWidth(string, length);
return true;
#if 0 /* GTK */
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);
#endif
return true;
}
static int utf8_char_len(const char *c)
{
uint8 *p = (uint8 *)c;
uint8 m = 0xE0;
uint8 v = 0xC0;
int i;
if (!*p)
return 0;
if ((*p & 0x80) == 0)
return 1;
if ((*p & 0xC0) == 0x80)
return 1; // actually one of the remaining bytes...
for (i = 2; i < 5; i++) {
if ((*p & m) == v)
return i;
v = (v >> 1) | 0x80;
m = (m >> 1) | 0x80;
}
return i;
}
/**
* 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)
{
//LOG(("(, '%s', %d, %d, , )", string, length, x));
//fprintf(stderr, "%s(, '%s', %d, %d, , )\n", __FUNCTION__, string, length, x);
int index;
BFont font;
#if 0 /* GTK */
PangoFontDescription *desc;
PangoContext *context;
PangoLayout *layout;
PangoRectangle pos;
#endif
nsfont_style_to_font(font, style);
BString str(string);
int32 len = str.CountChars();
float escapements[len];
float esc = 0.0;
float current = 0.0;
int i;
index = 0;
font.GetEscapements(string, len, escapements);
// slow but it should work
for (i = 0; string[index] && i < len; i++) {
if (x < current)
break;
esc += escapements[i];
current = font.Size() * esc;
index += utf8_char_len(&string[index]);
}
*actual_x = (int)current;
*char_offset = i; //index;
#if 0 /* GTK */
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);
if (pango_layout_xy_to_index(layout, x * PANGO_SCALE,
0, &index, 0) == 0)
index = length;
pango_layout_index_to_pos(layout, index, &pos);
g_object_unref(layout);
g_object_unref(context);
pango_font_description_free(desc);
*char_offset = index;
*actual_x = PANGO_PIXELS(pos.x);
#endif
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)
{
//fprintf(stderr, "%s(, '%s', %d, %d, , )\n", __FUNCTION__, string, length, x);
//LOG(("(, '%s', %d, %d, , )", string, length, x));
int index = 0;
BFont font;
#if 0 /* GTK */
PangoFontDescription *desc;
PangoContext *context;
PangoLayout *layout;
PangoLayoutLine *line;
PangoLayoutIter *iter;
PangoRectangle rect;
#endif
nsfont_style_to_font(font, style);
BString str(string);
int32 len = str.CountChars();
float escapements[len];
float esc = 0.0;
float current = 0.0;
float last_x = 0.0;
int i;
int last_space = 0;
font.GetEscapements(string, len, escapements);
// slow but it should work
for (i = 0; string[index] && i < len; i++) {
if (string[index] == ' ') {
last_x = current;
last_space = index;
}
if (x < current) {
*actual_x = (int)last_x;
*char_offset = last_space;
return true;
}
esc += escapements[i];
current = font.Size() * esc;
index += utf8_char_len(&string[index]);
}
*actual_x = MIN(*actual_x, (int)current);
*char_offset = index;
return true;
#if 0 /* GTK */
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);
#endif
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 bg, colour c)
{
//fprintf(stderr, "%s(, '%s', %d, %d, %d, )\n", __FUNCTION__, string, length, x, y);
//CALLED();
BFont font;
rgb_color oldbg;
rgb_color background;
rgb_color foreground;
BView *view;
float size;
if (length == 0)
return true;
nsfont_style_to_font(font, style);
background = nsbeos_rgb_colour(bg);
foreground = nsbeos_rgb_colour(c);
view = nsbeos_current_gc/*_lock*/();
if (view == NULL) {
warn_user("No GC", 0);
return false;
}
oldbg = view->LowColor();
drawing_mode oldmode = view->DrawingMode();
#if 0
if (oldbg != background)
view->SetLowColor(background);
#endif
view->SetLowColor(B_TRANSPARENT_32_BIT);
//view->SetScale() XXX
//printf("nsfont_paint: Size: %f\n", font.Size());
size = (float)(font.Size() * nsbeos_plot_get_scale());
#warning XXX use scale
view->SetFont(&font);
view->SetHighColor(foreground);
view->SetDrawingMode(B_OP_OVER);
BString line(string, length);
BPoint where(x, y + 1);
view->DrawString(line.String(), where);
view->SetDrawingMode(oldmode);
if (oldbg != background)
view->SetLowColor(oldbg);
//nsbeos_current_gc_unlock();
#if 0 /* GTK */
size = (float)((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);
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_font(font, 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);
#endif
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
*/
static void nsfont_style_to_font(BFont &font,
const struct css_style *style)
{
float size;
uint16 face = 0;
const char *family;
// 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:
family = option_font_serif;
break;
case CSS_FONT_FAMILY_MONOSPACE:
family = option_font_mono;
break;
case CSS_FONT_FAMILY_CURSIVE:
family = option_font_cursive;
break;
case CSS_FONT_FAMILY_FANTASY:
family = option_font_fantasy;
break;
case CSS_FONT_FAMILY_SANS_SERIF:
default:
family = option_font_sans;
break;
}
switch (style->font_style) {
case CSS_FONT_STYLE_ITALIC:
face = B_ITALIC_FACE;
break;
case CSS_FONT_STYLE_OBLIQUE:
face = B_ITALIC_FACE;
// XXX: no OBLIQUE flag ??
// maybe find "Oblique" style
// or use SetShear() ?
break;
default:
break;
}
switch (style->font_weight) {
case CSS_FONT_WEIGHT_NORMAL:
break;
case CSS_FONT_WEIGHT_BOLD:
case CSS_FONT_WEIGHT_600:
case CSS_FONT_WEIGHT_700:
#ifndef __HAIKU__XXX
case CSS_FONT_WEIGHT_800:
case CSS_FONT_WEIGHT_900:
#endif
face |= B_BOLD_FACE; break;
#ifdef __HAIKU__XXX
case CSS_FONT_WEIGHT_BOLDER:
case CSS_FONT_WEIGHT_800:
case CSS_FONT_WEIGHT_900:
face |= B_HEAVY_FACE; break;
case CSS_FONT_WEIGHT_100:
case CSS_FONT_WEIGHT_200:
case CSS_FONT_WEIGHT_300:
case CSS_FONT_WEIGHT_LIGHTER:
face |= B_LIGHT_FACE; break;
#endif
/*
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;
}
if (!face)
face = B_REGULAR_FACE;
//fprintf(stderr, "nsfont_style_to_font: %d, %d, %d -> '%s' %04x\n", style->font_family, style->font_style, style->font_weight, family, face);
if (family)
font.SetFamilyAndFace((const font_family)family, face);
else {
//XXX not used
font = be_plain_font;
font.SetFace(face);
}
#if 0
*font_size = css_len2px(&style->font_size.value.length, style) *
72.0 / 90.0 * 16.;
if (*font_size < option_font_min_size * 1.6)
*font_size = option_font_min_size * 1.6;
if (1600 < *font_size)
*font_size = 1600;
#endif
#if 0 /* GTK */
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);
//XXX ?
if (style->font_size.value.length.unit == CSS_UNIT_PX)
font.SetSize(size);
else
font.SetSize(font.Size() + size);
#endif
//fprintf(stderr, "nsfont_style_to_font: value %f unit %d\n", style->font_size.value.length.value, style->font_size.value.length.unit);
if (style->font_size.value.length.unit == CSS_UNIT_PT)
size = style->font_size.value.length.value;
else
size = css_len2pt(&style->font_size.value.length, style);
// * 72.0 / 90.0;
//XXX: pango stuff ?
if (size < abs(option_font_min_size / 10))
size = option_font_min_size / 10;
//fprintf(stderr, "nsfont_style_to_font: %f %d\n", size, style->font_size.value.length.unit);
font.SetSize(size);
#if 0 /* GTK */
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);
}
#endif
}
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