lbxgui: Use Cairo for drawing.

[liblbx.git] / src / gui / lbxgui.c

diff --git a/src/gui/lbxgui.c b/src/gui/lbxgui.c
index bb9e5e5664459c2ce9b06249f204adf55f80bb44..14da3787fc916cfe1b8c2a3a9f3b65dfae1b2ddd 100644 (file)
--- a/src/gui/lbxgui.c
+++ b/src/gui/lbxgui.c
@@ -1,7 +1,7 @@
 /*
  *  2ooM: The Master of Orion II Reverse Engineering Project
  *  Graphical tool for inspecting LBX archives.
- *  Copyright (C) 2010, 2014 Nick Bowler
+ *  Copyright © 2010, 2014 Nick Bowler
  *
  *  This program is free software: you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -17,8 +17,10 @@
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 #include <config.h>
+#include <assert.h>
 #include <stdlib.h>
 #include <string.h>
+#include <stdbool.h>
 #include <math.h>
 
 #include <gtk/gtk.h>
@@ -33,7 +35,9 @@ static GtkTreeStore *archives;
 static GtkBuilder *builder;
 
 static GtkWidget *canvas;
-static GdkGC     *bg_gc;
+
+static cairo_pattern_t *bg_pattern;
+static bool bg_stipple;
 
 static struct lbx_image *image;
 
@@ -135,17 +139,32 @@ static gboolean timeout(gpointer data)
 
 gboolean canvas_expose(GtkWidget *canvas, GdkEventExpose *event, gpointer data)
 {
+       cairo_t *cr;
+
        if (!framebuf)
                return FALSE;
 
-       gdk_draw_rectangle(canvas->window, bg_gc, TRUE,
-               event->area.x, event->area.y,
-               event->area.width, event->area.height);
+       cr = gdk_cairo_create(canvas->window);
+
+       if (bg_stipple) {
+               cairo_set_source_rgb(cr, 0.6, 0.6, 0.6);
+               gdk_cairo_rectangle(cr, &event->area);
+               cairo_fill(cr);
+
+               cairo_set_source_rgb(cr, 0.3, 0.3, 0.3);
+               gdk_cairo_rectangle(cr, &event->area);
+               cairo_mask(cr, bg_pattern);
+       } else {
+               cairo_set_source_rgb(cr, 0, 0, 0);
+               gdk_cairo_rectangle(cr, &event->area);
+               cairo_fill(cr);
+       }
+
+       gdk_cairo_set_source_pixbuf(cr, framebuf, 0, 0);
+       gdk_cairo_rectangle(cr, &event->area);
+       cairo_fill(cr);
 
-       gdk_draw_pixbuf(canvas->window, NULL, framebuf,
-               event->area.x, event->area.y, event->area.x, event->area.y,
-               event->area.width, event->area.height,
-               GDK_RGB_DITHER_NORMAL, 0, 0);
+       cairo_destroy(cr);
 
        return TRUE;
 }
@@ -280,19 +299,7 @@ void set_image(GtkComboBox *combo)
 
 void set_background(GtkCheckMenuItem *item, gpointer data)
 {
-       GdkColor black = { .red = 0,      .green = 0,      .blue = 0      };
-       GdkColor dark  = { .red = 0x6666, .green = 0x6666, .blue = 0x6666 };
-       GdkColor light = { .red = 0x9999, .green = 0x9999, .blue = 0x9999 };
-
-       if (gtk_check_menu_item_get_active(item)) {
-               /* Enable stippled background. */
-               gdk_gc_set_rgb_fg_color(bg_gc, &dark);
-               gdk_gc_set_rgb_bg_color(bg_gc, &light);
-               gdk_gc_set_fill(bg_gc, GDK_OPAQUE_STIPPLED);
-       } else {
-               gdk_gc_set_rgb_fg_color(bg_gc, &black);
-               gdk_gc_set_fill(bg_gc, GDK_SOLID);
-       }
+       bg_stipple = gtk_check_menu_item_get_active(item);
        redraw_image();
 }
 
@@ -444,18 +451,72 @@ static void init_interface(void)
        init_combobox(builder, "overchooser");
 }
 
-static void init_background(GdkDrawable *drawable)
+/*
+ * Reverse the bits in each byte of a 32-bit word.
+ */
+static guint32 reverse4b(guint32 v)
 {
-       GtkWidget *check;
-       GdkBitmap *bitmap;
+       v = ((v >> 1) & 0x55555555) | ((v & 0x55555555) << 1);
+       v = ((v >> 2) & 0x33333333) | ((v & 0x33333333) << 2);
+       v = ((v >> 4) & 0x0f0f0f0f) | ((v & 0x0f0f0f0f) << 4);
+       return v;
+}
+
+static cairo_surface_t *
+xbm_to_cairo(const void *xbmdata, int width, int height)
+{
+       const unsigned char *data = xbmdata;
+       unsigned char *sdata;
+       cairo_surface_t *s;
+       int stride;
+
+       s = cairo_image_surface_create(CAIRO_FORMAT_A1, width, height);
+       if (cairo_surface_status(s) != CAIRO_STATUS_SUCCESS)
+               return s;
+
+       sdata = cairo_image_surface_get_data(s);
+       stride = cairo_image_surface_get_stride(s);
+       assert(stride % 4 == 0);
+       width = (width + 7) / 8;
+
+       cairo_surface_flush(s);
+       for (int y = 0; y < height; y++) {
+               /*
+                * Cairo is nuts.  The mapping of bits to pixels in the A1
+                * format actually depends on the host *byte* ordering, so
+                * we actually need these two separate cases.
+                */
+               if (G_BYTE_ORDER == G_LITTLE_ENDIAN) {
+                       /* Easy, XBM and Cairo match in this case */
+                       memcpy(sdata, data, width);
+               } else {
+                       /* No such luck, we have to convert manually */
+                       for (int x = 0; x < width; x += 4) {
+                               guint32 word = 0;
+
+                               memcpy(&word, data+x, MIN(4, width-x));
+                               word = reverse4b(word);
+                               memcpy(sdata+x, &word, 4);
+                       }
+               }
 
-       bg_gc = gdk_gc_new(canvas->window);
+               sdata += stride;
+               data += width;
+       }
+       cairo_surface_mark_dirty(s);
+
+       return s;
+}
 
-       bitmap = gdk_bitmap_create_from_data(drawable, (gchar *)bg_bits,
-               bg_width, bg_height);
+static void init_background(GdkDrawable *drawable)
+{
+       cairo_surface_t *bg;
+       GtkWidget *check;
 
-       gdk_gc_set_stipple(bg_gc, bitmap);
-       gdk_gc_set_ts_origin(bg_gc, 0, 0);
+       bg = xbm_to_cairo(bg_bits, bg_width, bg_height);
+       bg_pattern = cairo_pattern_create_for_surface(bg);
+       cairo_pattern_set_extend(bg_pattern, CAIRO_EXTEND_REPEAT);
+       cairo_surface_destroy(bg);
 
        check = GTK_WIDGET(gtk_builder_get_object(builder, "menu-background"));
        gtk_check_menu_item_set_active(GTK_CHECK_MENU_ITEM(check), TRUE);