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gtk.c
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gtk.c
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/*
* gtk.c: GTK front end for my puzzle collection.
*/
#include <stdio.h>
#include <assert.h>
#include <stdlib.h>
#include <time.h>
#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include <math.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <gtk/gtk.h>
#include <gdk/gdkkeysyms.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <gdk/gdkx.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xatom.h>
#include "puzzles.h"
#if GTK_CHECK_VERSION(2,0,0)
# define USE_PANGO
# ifdef PANGO_VERSION_CHECK
# if PANGO_VERSION_CHECK(1,8,0)
# define HAVE_SENSIBLE_ABSOLUTE_SIZE_FUNCTION
# endif
# endif
#endif
#if !GTK_CHECK_VERSION(2,4,0)
# define OLD_FILESEL
#endif
#if GTK_CHECK_VERSION(2,8,0)
# define USE_CAIRO
# if GTK_CHECK_VERSION(3,0,0) || defined(GDK_DISABLE_DEPRECATED)
# define USE_CAIRO_WITHOUT_PIXMAP
# endif
#endif
#if GTK_CHECK_VERSION(3,0,0)
/* The old names are still more concise! */
#define gtk_hbox_new(x,y) gtk_box_new(GTK_ORIENTATION_HORIZONTAL,y)
#define gtk_vbox_new(x,y) gtk_box_new(GTK_ORIENTATION_VERTICAL,y)
/* GTK 3 has retired stock button labels */
#define LABEL_OK "_OK"
#define LABEL_CANCEL "_Cancel"
#define LABEL_NO "_No"
#define LABEL_YES "_Yes"
#define LABEL_SAVE "_Save"
#define LABEL_OPEN "_Open"
#define gtk_button_new_with_our_label gtk_button_new_with_mnemonic
#else
#define LABEL_OK GTK_STOCK_OK
#define LABEL_CANCEL GTK_STOCK_CANCEL
#define LABEL_NO GTK_STOCK_NO
#define LABEL_YES GTK_STOCK_YES
#define LABEL_SAVE GTK_STOCK_SAVE
#define LABEL_OPEN GTK_STOCK_OPEN
#define gtk_button_new_with_our_label gtk_button_new_from_stock
#endif
/* #undef USE_CAIRO */
/* #define NO_THICK_LINE */
#ifdef DEBUGGING
static FILE *debug_fp = NULL;
void dputs(char *buf)
{
if (!debug_fp) {
debug_fp = fopen("debug.log", "w");
}
fputs(buf, stderr);
if (debug_fp) {
fputs(buf, debug_fp);
fflush(debug_fp);
}
}
void debug_printf(char *fmt, ...)
{
char buf[4096];
va_list ap;
va_start(ap, fmt);
vsprintf(buf, fmt, ap);
dputs(buf);
va_end(ap);
}
#endif
/* ----------------------------------------------------------------------
* Error reporting functions used elsewhere.
*/
void fatal(char *fmt, ...)
{
va_list ap;
fprintf(stderr, "fatal error: ");
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
fprintf(stderr, "\n");
exit(1);
}
/* ----------------------------------------------------------------------
* GTK front end to puzzles.
*/
static void changed_preset(frontend *fe);
struct font {
#ifdef USE_PANGO
PangoFontDescription *desc;
#else
GdkFont *font;
#endif
int type;
int size;
};
/*
* This structure holds all the data relevant to a single window.
* In principle this would allow us to open multiple independent
* puzzle windows, although I can't currently see any real point in
* doing so. I'm just coding cleanly because there's no
* particularly good reason not to.
*/
struct frontend {
GtkWidget *window;
GtkAccelGroup *accelgroup;
GtkWidget *area;
GtkWidget *statusbar;
GtkWidget *menubar;
guint statusctx;
int w, h;
midend *me;
#ifdef USE_CAIRO
const float *colours;
cairo_t *cr;
cairo_surface_t *image;
#ifndef USE_CAIRO_WITHOUT_PIXMAP
GdkPixmap *pixmap;
#endif
GdkColor background; /* for painting outside puzzle area */
#else
GdkPixmap *pixmap;
GdkGC *gc;
GdkColor *colours;
GdkColormap *colmap;
int backgroundindex; /* which of colours[] is background */
#endif
int ncolours;
int bbox_l, bbox_r, bbox_u, bbox_d;
int timer_active, timer_id;
struct timeval last_time;
struct font *fonts;
int nfonts, fontsize;
config_item *cfg;
int cfg_which, cfgret;
GtkWidget *cfgbox;
void *paste_data;
int paste_data_len;
int pw, ph; /* pixmap size (w, h are area size) */
int ox, oy; /* offset of pixmap in drawing area */
#ifdef OLD_FILESEL
char *filesel_name;
#endif
GSList *preset_radio;
int n_preset_menu_items;
int preset_threaded;
GtkWidget *preset_custom;
GtkWidget *copy_menu_item;
#if !GTK_CHECK_VERSION(3,0,0)
int drawing_area_shrink_pending;
int menubar_is_local;
#endif
};
struct blitter {
#ifdef USE_CAIRO
cairo_surface_t *image;
#else
GdkPixmap *pixmap;
#endif
int w, h, x, y;
};
void get_random_seed(void **randseed, int *randseedsize)
{
struct timeval *tvp = snew(struct timeval);
gettimeofday(tvp, NULL);
*randseed = (void *)tvp;
*randseedsize = sizeof(struct timeval);
}
void frontend_default_colour(frontend *fe, float *output)
{
#if !GTK_CHECK_VERSION(3,0,0)
/*
* Use the widget style's default background colour as the
* background for the puzzle drawing area.
*/
GdkColor col = gtk_widget_get_style(fe->window)->bg[GTK_STATE_NORMAL];
output[0] = col.red / 65535.0;
output[1] = col.green / 65535.0;
output[2] = col.blue / 65535.0;
#else
/*
* GTK 3 has decided that there's no such thing as a 'default
* background colour' any more, because widget styles might set
* the background to something more complicated like a background
* image. We don't want to get into overlaying our entire puzzle
* on an arbitrary background image, so we'll just make up a
* reasonable shade of grey.
*/
output[0] = output[1] = output[2] = 0.9F;
#endif
}
void gtk_status_bar(void *handle, char *text)
{
frontend *fe = (frontend *)handle;
assert(fe->statusbar);
gtk_statusbar_pop(GTK_STATUSBAR(fe->statusbar), fe->statusctx);
gtk_statusbar_push(GTK_STATUSBAR(fe->statusbar), fe->statusctx, text);
}
/* ----------------------------------------------------------------------
* Cairo drawing functions.
*/
#ifdef USE_CAIRO
static void setup_drawing(frontend *fe)
{
fe->cr = cairo_create(fe->image);
cairo_set_antialias(fe->cr, CAIRO_ANTIALIAS_GRAY);
cairo_set_line_width(fe->cr, 1.0);
cairo_set_line_cap(fe->cr, CAIRO_LINE_CAP_SQUARE);
cairo_set_line_join(fe->cr, CAIRO_LINE_JOIN_ROUND);
}
static void teardown_drawing(frontend *fe)
{
cairo_destroy(fe->cr);
fe->cr = NULL;
#ifndef USE_CAIRO_WITHOUT_PIXMAP
{
cairo_t *cr = gdk_cairo_create(fe->pixmap);
cairo_set_source_surface(cr, fe->image, 0, 0);
cairo_rectangle(cr,
fe->bbox_l - 1,
fe->bbox_u - 1,
fe->bbox_r - fe->bbox_l + 2,
fe->bbox_d - fe->bbox_u + 2);
cairo_fill(cr);
cairo_destroy(cr);
}
#endif
}
static void snaffle_colours(frontend *fe)
{
fe->colours = midend_colours(fe->me, &fe->ncolours);
}
static void set_colour(frontend *fe, int colour)
{
cairo_set_source_rgb(fe->cr,
fe->colours[3*colour + 0],
fe->colours[3*colour + 1],
fe->colours[3*colour + 2]);
}
static void set_window_background(frontend *fe, int colour)
{
#if GTK_CHECK_VERSION(3,0,0)
GdkRGBA rgba;
rgba.red = fe->colours[3*colour + 0];
rgba.green = fe->colours[3*colour + 1];
rgba.blue = fe->colours[3*colour + 2];
rgba.alpha = 1.0;
gdk_window_set_background_rgba(gtk_widget_get_window(fe->area), &rgba);
gdk_window_set_background_rgba(gtk_widget_get_window(fe->window), &rgba);
#else
GdkColormap *colmap;
colmap = gdk_colormap_get_system();
fe->background.red = fe->colours[3*colour + 0] * 65535;
fe->background.green = fe->colours[3*colour + 1] * 65535;
fe->background.blue = fe->colours[3*colour + 2] * 65535;
if (!gdk_colormap_alloc_color(colmap, &fe->background, FALSE, FALSE)) {
g_error("couldn't allocate background (#%02x%02x%02x)\n",
fe->background.red >> 8, fe->background.green >> 8,
fe->background.blue >> 8);
}
gdk_window_set_background(gtk_widget_get_window(fe->area),
&fe->background);
gdk_window_set_background(gtk_widget_get_window(fe->window),
&fe->background);
#endif
}
static PangoLayout *make_pango_layout(frontend *fe)
{
return (pango_cairo_create_layout(fe->cr));
}
static void draw_pango_layout(frontend *fe, PangoLayout *layout,
int x, int y)
{
cairo_move_to(fe->cr, x, y);
pango_cairo_show_layout(fe->cr, layout);
}
static void save_screenshot_png(frontend *fe, const char *screenshot_file)
{
cairo_surface_write_to_png(fe->image, screenshot_file);
}
static void do_clip(frontend *fe, int x, int y, int w, int h)
{
cairo_new_path(fe->cr);
cairo_rectangle(fe->cr, x, y, w, h);
cairo_clip(fe->cr);
}
static void do_unclip(frontend *fe)
{
cairo_reset_clip(fe->cr);
}
static void do_draw_rect(frontend *fe, int x, int y, int w, int h)
{
cairo_save(fe->cr);
cairo_new_path(fe->cr);
cairo_set_antialias(fe->cr, CAIRO_ANTIALIAS_NONE);
cairo_rectangle(fe->cr, x, y, w, h);
cairo_fill(fe->cr);
cairo_restore(fe->cr);
}
static void do_draw_line(frontend *fe, int x1, int y1, int x2, int y2)
{
cairo_new_path(fe->cr);
cairo_move_to(fe->cr, x1 + 0.5, y1 + 0.5);
cairo_line_to(fe->cr, x2 + 0.5, y2 + 0.5);
cairo_stroke(fe->cr);
}
static void do_draw_thick_line(frontend *fe, float thickness,
float x1, float y1, float x2, float y2)
{
cairo_save(fe->cr);
cairo_set_line_width(fe->cr, thickness);
cairo_new_path(fe->cr);
cairo_move_to(fe->cr, x1, y1);
cairo_line_to(fe->cr, x2, y2);
cairo_stroke(fe->cr);
cairo_restore(fe->cr);
}
static void do_draw_poly(frontend *fe, int *coords, int npoints,
int fillcolour, int outlinecolour)
{
int i;
cairo_new_path(fe->cr);
for (i = 0; i < npoints; i++)
cairo_line_to(fe->cr, coords[i*2] + 0.5, coords[i*2 + 1] + 0.5);
cairo_close_path(fe->cr);
if (fillcolour >= 0) {
set_colour(fe, fillcolour);
cairo_fill_preserve(fe->cr);
}
assert(outlinecolour >= 0);
set_colour(fe, outlinecolour);
cairo_stroke(fe->cr);
}
static void do_draw_circle(frontend *fe, int cx, int cy, int radius,
int fillcolour, int outlinecolour)
{
cairo_new_path(fe->cr);
cairo_arc(fe->cr, cx + 0.5, cy + 0.5, radius, 0, 2*PI);
cairo_close_path(fe->cr); /* Just in case... */
if (fillcolour >= 0) {
set_colour(fe, fillcolour);
cairo_fill_preserve(fe->cr);
}
assert(outlinecolour >= 0);
set_colour(fe, outlinecolour);
cairo_stroke(fe->cr);
}
static void setup_blitter(blitter *bl, int w, int h)
{
bl->image = cairo_image_surface_create(CAIRO_FORMAT_RGB24, w, h);
}
static void teardown_blitter(blitter *bl)
{
cairo_surface_destroy(bl->image);
}
static void do_blitter_save(frontend *fe, blitter *bl, int x, int y)
{
cairo_t *cr = cairo_create(bl->image);
cairo_set_source_surface(cr, fe->image, -x, -y);
cairo_paint(cr);
cairo_destroy(cr);
}
static void do_blitter_load(frontend *fe, blitter *bl, int x, int y)
{
cairo_set_source_surface(fe->cr, bl->image, x, y);
cairo_paint(fe->cr);
}
static void clear_backing_store(frontend *fe)
{
fe->image = NULL;
}
static void wipe_and_destroy_cairo(frontend *fe, cairo_t *cr)
{
cairo_set_source_rgb(cr, fe->colours[0], fe->colours[1], fe->colours[2]);
cairo_paint(cr);
cairo_destroy(cr);
}
static void setup_backing_store(frontend *fe)
{
#ifndef USE_CAIRO_WITHOUT_PIXMAP
fe->pixmap = gdk_pixmap_new(gtk_widget_get_window(fe->area),
fe->pw, fe->ph, -1);
#endif
fe->image = cairo_image_surface_create(CAIRO_FORMAT_RGB24,
fe->pw, fe->ph);
wipe_and_destroy_cairo(fe, cairo_create(fe->image));
#ifndef USE_CAIRO_WITHOUT_PIXMAP
wipe_and_destroy_cairo(fe, gdk_cairo_create(fe->pixmap));
#endif
wipe_and_destroy_cairo(fe, gdk_cairo_create
(gtk_widget_get_window(fe->area)));
}
static int backing_store_ok(frontend *fe)
{
return (!!fe->image);
}
static void teardown_backing_store(frontend *fe)
{
cairo_surface_destroy(fe->image);
#ifndef USE_CAIRO_WITHOUT_PIXMAP
gdk_pixmap_unref(fe->pixmap);
#endif
fe->image = NULL;
}
#endif
/* ----------------------------------------------------------------------
* GDK drawing functions.
*/
#ifndef USE_CAIRO
static void setup_drawing(frontend *fe)
{
fe->gc = gdk_gc_new(fe->area->window);
}
static void teardown_drawing(frontend *fe)
{
gdk_gc_unref(fe->gc);
fe->gc = NULL;
}
static void snaffle_colours(frontend *fe)
{
int i, ncolours;
float *colours;
gboolean *success;
fe->colmap = gdk_colormap_get_system();
colours = midend_colours(fe->me, &ncolours);
fe->ncolours = ncolours;
fe->colours = snewn(ncolours, GdkColor);
for (i = 0; i < ncolours; i++) {
fe->colours[i].red = colours[i*3] * 0xFFFF;
fe->colours[i].green = colours[i*3+1] * 0xFFFF;
fe->colours[i].blue = colours[i*3+2] * 0xFFFF;
}
success = snewn(ncolours, gboolean);
gdk_colormap_alloc_colors(fe->colmap, fe->colours, ncolours,
FALSE, FALSE, success);
for (i = 0; i < ncolours; i++) {
if (!success[i]) {
g_error("couldn't allocate colour %d (#%02x%02x%02x)\n",
i, fe->colours[i].red >> 8,
fe->colours[i].green >> 8,
fe->colours[i].blue >> 8);
}
}
}
static void set_window_background(frontend *fe, int colour)
{
fe->backgroundindex = colour;
gdk_window_set_background(fe->area->window, &fe->colours[colour]);
gdk_window_set_background(fe->window->window, &fe->colours[colour]);
}
static void set_colour(frontend *fe, int colour)
{
gdk_gc_set_foreground(fe->gc, &fe->colours[colour]);
}
#ifdef USE_PANGO
static PangoLayout *make_pango_layout(frontend *fe)
{
return (pango_layout_new(gtk_widget_get_pango_context(fe->area)));
}
static void draw_pango_layout(frontend *fe, PangoLayout *layout,
int x, int y)
{
gdk_draw_layout(fe->pixmap, fe->gc, x, y, layout);
}
#endif
static void save_screenshot_png(frontend *fe, const char *screenshot_file)
{
GdkPixbuf *pb;
GError *gerror = NULL;
midend_redraw(fe->me);
pb = gdk_pixbuf_get_from_drawable(NULL, fe->pixmap,
NULL, 0, 0, 0, 0, -1, -1);
gdk_pixbuf_save(pb, screenshot_file, "png", &gerror, NULL);
}
static void do_clip(frontend *fe, int x, int y, int w, int h)
{
GdkRectangle rect;
rect.x = x;
rect.y = y;
rect.width = w;
rect.height = h;
gdk_gc_set_clip_rectangle(fe->gc, &rect);
}
static void do_unclip(frontend *fe)
{
GdkRectangle rect;
rect.x = 0;
rect.y = 0;
rect.width = fe->w;
rect.height = fe->h;
gdk_gc_set_clip_rectangle(fe->gc, &rect);
}
static void do_draw_rect(frontend *fe, int x, int y, int w, int h)
{
gdk_draw_rectangle(fe->pixmap, fe->gc, 1, x, y, w, h);
}
static void do_draw_line(frontend *fe, int x1, int y1, int x2, int y2)
{
gdk_draw_line(fe->pixmap, fe->gc, x1, y1, x2, y2);
}
static void do_draw_thick_line(frontend *fe, float thickness,
float x1, float y1, float x2, float y2)
{
GdkGCValues save;
gdk_gc_get_values(fe->gc, &save);
gdk_gc_set_line_attributes(fe->gc,
thickness,
GDK_LINE_SOLID,
GDK_CAP_BUTT,
GDK_JOIN_BEVEL);
gdk_draw_line(fe->pixmap, fe->gc, x1, y1, x2, y2);
gdk_gc_set_line_attributes(fe->gc,
save.line_width,
save.line_style,
save.cap_style,
save.join_style);
}
static void do_draw_poly(frontend *fe, int *coords, int npoints,
int fillcolour, int outlinecolour)
{
GdkPoint *points = snewn(npoints, GdkPoint);
int i;
for (i = 0; i < npoints; i++) {
points[i].x = coords[i*2];
points[i].y = coords[i*2+1];
}
if (fillcolour >= 0) {
set_colour(fe, fillcolour);
gdk_draw_polygon(fe->pixmap, fe->gc, TRUE, points, npoints);
}
assert(outlinecolour >= 0);
set_colour(fe, outlinecolour);
/*
* In principle we ought to be able to use gdk_draw_polygon for
* the outline as well. In fact, it turns out to interact badly
* with a clipping region, for no terribly obvious reason, so I
* draw the outline as a sequence of lines instead.
*/
for (i = 0; i < npoints; i++)
gdk_draw_line(fe->pixmap, fe->gc,
points[i].x, points[i].y,
points[(i+1)%npoints].x, points[(i+1)%npoints].y);
sfree(points);
}
static void do_draw_circle(frontend *fe, int cx, int cy, int radius,
int fillcolour, int outlinecolour)
{
if (fillcolour >= 0) {
set_colour(fe, fillcolour);
gdk_draw_arc(fe->pixmap, fe->gc, TRUE,
cx - radius, cy - radius,
2 * radius, 2 * radius, 0, 360 * 64);
}
assert(outlinecolour >= 0);
set_colour(fe, outlinecolour);
gdk_draw_arc(fe->pixmap, fe->gc, FALSE,
cx - radius, cy - radius,
2 * radius, 2 * radius, 0, 360 * 64);
}
static void setup_blitter(blitter *bl, int w, int h)
{
/*
* We can't create the pixmap right now, because fe->window
* might not yet exist. So we just cache w and h and create it
* during the firs call to blitter_save.
*/
bl->pixmap = NULL;
}
static void teardown_blitter(blitter *bl)
{
if (bl->pixmap)
gdk_pixmap_unref(bl->pixmap);
}
static void do_blitter_save(frontend *fe, blitter *bl, int x, int y)
{
if (!bl->pixmap)
bl->pixmap = gdk_pixmap_new(fe->area->window, bl->w, bl->h, -1);
gdk_draw_pixmap(bl->pixmap,
fe->area->style->fg_gc[GTK_WIDGET_STATE(fe->area)],
fe->pixmap,
x, y, 0, 0, bl->w, bl->h);
}
static void do_blitter_load(frontend *fe, blitter *bl, int x, int y)
{
assert(bl->pixmap);
gdk_draw_pixmap(fe->pixmap,
fe->area->style->fg_gc[GTK_WIDGET_STATE(fe->area)],
bl->pixmap,
0, 0, x, y, bl->w, bl->h);
}
static void clear_backing_store(frontend *fe)
{
fe->pixmap = NULL;
}
static void setup_backing_store(frontend *fe)
{
GdkGC *gc;
fe->pixmap = gdk_pixmap_new(fe->area->window, fe->pw, fe->ph, -1);
gc = gdk_gc_new(fe->area->window);
gdk_gc_set_foreground(gc, &fe->colours[0]);
gdk_draw_rectangle(fe->pixmap, gc, 1, 0, 0, fe->pw, fe->ph);
gdk_draw_rectangle(fe->area->window, gc, 1, 0, 0, fe->w, fe->h);
gdk_gc_unref(gc);
}
static int backing_store_ok(frontend *fe)
{
return (!!fe->pixmap);
}
static void teardown_backing_store(frontend *fe)
{
gdk_pixmap_unref(fe->pixmap);
fe->pixmap = NULL;
}
#endif
#ifndef USE_CAIRO_WITHOUT_PIXMAP
static void repaint_rectangle(frontend *fe, GtkWidget *widget,
int x, int y, int w, int h)
{
GdkGC *gc = gdk_gc_new(gtk_widget_get_window(widget));
#ifdef USE_CAIRO
gdk_gc_set_foreground(gc, &fe->background);
#else
gdk_gc_set_foreground(gc, &fe->colours[fe->backgroundindex]);
#endif
if (x < fe->ox) {
gdk_draw_rectangle(gtk_widget_get_window(widget), gc,
TRUE, x, y, fe->ox - x, h);
w -= (fe->ox - x);
x = fe->ox;
}
if (y < fe->oy) {
gdk_draw_rectangle(gtk_widget_get_window(widget), gc,
TRUE, x, y, w, fe->oy - y);
h -= (fe->oy - y);
y = fe->oy;
}
if (w > fe->pw) {
gdk_draw_rectangle(gtk_widget_get_window(widget), gc,
TRUE, x + fe->pw, y, w - fe->pw, h);
w = fe->pw;
}
if (h > fe->ph) {
gdk_draw_rectangle(gtk_widget_get_window(widget), gc,
TRUE, x, y + fe->ph, w, h - fe->ph);
h = fe->ph;
}
gdk_draw_pixmap(gtk_widget_get_window(widget), gc, fe->pixmap,
x - fe->ox, y - fe->oy, x, y, w, h);
gdk_gc_unref(gc);
}
#endif
/* ----------------------------------------------------------------------
* Pango font functions.
*/
#ifdef USE_PANGO
static void add_font(frontend *fe, int index, int fonttype, int fontsize)
{
/*
* Use Pango to find the closest match to the requested
* font.
*/
PangoFontDescription *fd;
fd = pango_font_description_new();
/* `Monospace' and `Sans' are meta-families guaranteed to exist */
pango_font_description_set_family(fd, fonttype == FONT_FIXED ?
"Monospace" : "Sans");
pango_font_description_set_weight(fd, PANGO_WEIGHT_BOLD);
/*
* I found some online Pango documentation which
* described a function called
* pango_font_description_set_absolute_size(), which is
* _exactly_ what I want here. Unfortunately, none of
* my local Pango installations have it (presumably
* they're too old), so I'm going to have to hack round
* it by figuring out the point size myself. This
* limits me to X and probably also breaks in later
* Pango installations, so ideally I should add another
* CHECK_VERSION type ifdef and use set_absolute_size
* where available. All very annoying.
*/
#ifdef HAVE_SENSIBLE_ABSOLUTE_SIZE_FUNCTION
pango_font_description_set_absolute_size(fd, PANGO_SCALE*fontsize);
#else
{
Display *d = GDK_DISPLAY();
int s = DefaultScreen(d);
double resolution =
(PANGO_SCALE * 72.27 / 25.4) *
((double) DisplayWidthMM(d, s) / DisplayWidth (d, s));
pango_font_description_set_size(fd, resolution * fontsize);
}
#endif
fe->fonts[index].desc = fd;
}
static void align_and_draw_text(frontend *fe,
int index, int align, int x, int y,
const char *text)
{
PangoLayout *layout;
PangoRectangle rect;
layout = make_pango_layout(fe);
/*
* Create a layout.
*/
pango_layout_set_font_description(layout, fe->fonts[index].desc);
pango_layout_set_text(layout, text, strlen(text));
pango_layout_get_pixel_extents(layout, NULL, &rect);
if (align & ALIGN_VCENTRE)
rect.y -= rect.height / 2;
else
rect.y -= rect.height;
if (align & ALIGN_HCENTRE)
rect.x -= rect.width / 2;
else if (align & ALIGN_HRIGHT)
rect.x -= rect.width;
draw_pango_layout(fe, layout, rect.x + x, rect.y + y);
g_object_unref(layout);
}
#endif
/* ----------------------------------------------------------------------
* Old-fashioned font functions.
*/
#ifndef USE_PANGO
static void add_font(int index, int fonttype, int fontsize)
{
/*
* In GTK 1.2, I don't know of any plausible way to
* pick a suitable font, so I'm just going to be
* tedious.
*/
fe->fonts[i].font = gdk_font_load(fonttype == FONT_FIXED ?
"fixed" : "variable");
}
static void align_and_draw_text(int index, int align, int x, int y,
const char *text)
{
int lb, rb, wid, asc, desc;
/*
* Measure vertical string extents with respect to the same
* string always...
*/
gdk_string_extents(fe->fonts[i].font,
"ABCDEFGHIJKLMNOPQRSTUVWXYZ",
&lb, &rb, &wid, &asc, &desc);
if (align & ALIGN_VCENTRE)
y += asc - (asc+desc)/2;
else
y += asc;
/*
* ... but horizontal extents with respect to the provided
* string. This means that multiple pieces of text centred
* on the same y-coordinate don't have different baselines.
*/
gdk_string_extents(fe->fonts[i].font, text,
&lb, &rb, &wid, &asc, &desc);
if (align & ALIGN_HCENTRE)
x -= wid / 2;
else if (align & ALIGN_HRIGHT)
x -= wid;
/*
* Actually draw the text.
*/
gdk_draw_string(fe->pixmap, fe->fonts[i].font, fe->gc, x, y, text);
}
#endif
/* ----------------------------------------------------------------------
* The exported drawing functions.
*/
void gtk_start_draw(void *handle)
{
frontend *fe = (frontend *)handle;
fe->bbox_l = fe->w;
fe->bbox_r = 0;
fe->bbox_u = fe->h;
fe->bbox_d = 0;
setup_drawing(fe);
}
void gtk_clip(void *handle, int x, int y, int w, int h)
{
frontend *fe = (frontend *)handle;
do_clip(fe, x, y, w, h);
}
void gtk_unclip(void *handle)
{
frontend *fe = (frontend *)handle;
do_unclip(fe);
}
void gtk_draw_text(void *handle, int x, int y, int fonttype, int fontsize,
int align, int colour, char *text)
{
frontend *fe = (frontend *)handle;
int i;
/*
* Find or create the font.
*/
for (i = 0; i < fe->nfonts; i++)
if (fe->fonts[i].type == fonttype && fe->fonts[i].size == fontsize)
break;
if (i == fe->nfonts) {
if (fe->fontsize <= fe->nfonts) {
fe->fontsize = fe->nfonts + 10;
fe->fonts = sresize(fe->fonts, fe->fontsize, struct font);
}
fe->nfonts++;
fe->fonts[i].type = fonttype;
fe->fonts[i].size = fontsize;
add_font(fe, i, fonttype, fontsize);
}
/*
* Do the job.
*/
set_colour(fe, colour);
align_and_draw_text(fe, i, align, x, y, text);
}
void gtk_draw_rect(void *handle, int x, int y, int w, int h, int colour)
{
frontend *fe = (frontend *)handle;
set_colour(fe, colour);
do_draw_rect(fe, x, y, w, h);
}
void gtk_draw_line(void *handle, int x1, int y1, int x2, int y2, int colour)
{
frontend *fe = (frontend *)handle;
set_colour(fe, colour);
do_draw_line(fe, x1, y1, x2, y2);
}
void gtk_draw_thick_line(void *handle, float thickness,
float x1, float y1, float x2, float y2, int colour)
{
frontend *fe = (frontend *)handle;
set_colour(fe, colour);
do_draw_thick_line(fe, thickness, x1, y1, x2, y2);
}
void gtk_draw_poly(void *handle, int *coords, int npoints,
int fillcolour, int outlinecolour)
{
frontend *fe = (frontend *)handle;
do_draw_poly(fe, coords, npoints, fillcolour, outlinecolour);
}
void gtk_draw_circle(void *handle, int cx, int cy, int radius,
int fillcolour, int outlinecolour)
{
frontend *fe = (frontend *)handle;
do_draw_circle(fe, cx, cy, radius, fillcolour, outlinecolour);
}
blitter *gtk_blitter_new(void *handle, int w, int h)
{
blitter *bl = snew(blitter);