From 242547a147c741c338b22a095a398785280e6f8f Mon Sep 17 00:00:00 2001
From: Nick Bowler <nbowler@draconx.ca>
Date: Mon, 8 Feb 2010 21:19:36 -0500
Subject: [PATCH] lbxgui: Make transparent pixels more obvious.

---
 src/gui/bg.xbm   | 27 +++++++++++++++++++++++++++
 src/gui/lbxgui.c | 37 ++++++++++++++++++++++++++++++++-----
 2 files changed, 59 insertions(+), 5 deletions(-)
 create mode 100644 src/gui/bg.xbm

diff --git a/src/gui/bg.xbm b/src/gui/bg.xbm
new file mode 100644
index 0000000..b37f454
--- /dev/null
+++ b/src/gui/bg.xbm
@@ -0,0 +1,27 @@
+#define bg_width 48
+#define bg_height 48
+static unsigned char bg_bits[] = {
+   0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00,
+   0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00,
+   0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00,
+   0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00,
+   0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00,
+   0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00,
+   0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00,
+   0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00,
+   0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00,
+   0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00,
+   0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00,
+   0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00,
+   0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff,
+   0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff,
+   0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff,
+   0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff,
+   0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff,
+   0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff,
+   0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff,
+   0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff,
+   0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff,
+   0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff,
+   0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff,
+   0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff };
diff --git a/src/gui/lbxgui.c b/src/gui/lbxgui.c
index 21dee9a..ebb92ab 100644
--- a/src/gui/lbxgui.c
+++ b/src/gui/lbxgui.c
@@ -8,10 +8,14 @@
 #include "lbx.h"
 #include "image.h"
 
+#include "bg.xbm"
+
 static GtkTreeStore *archives;
 static GtkBuilder *builder;
 
 static GtkWidget *canvas;
+static GdkGC     *bg_gc;
+
 static LBX_IMG *image;
 /* LBX images can have up to three palettes, with each superseding the last. */
 static struct lbx_colour palette_external[256];
@@ -75,15 +79,14 @@ static int render_frame(LBX_IMG *img, GdkPixbuf *buf, unsigned frame)
 	stride = gdk_pixbuf_get_rowstride(buf);
 
 	for (unsigned i = 0; i < info.height; i++) {
-		unsigned char (*p)[3] = (void *)(data + i*stride);
+		unsigned char (*p)[4] = (void *)(data + i*stride);
 
 		for (unsigned j = 0; j < info.width; j++) {
 			if (imgmask[i][j]) {
 				get_colour(imgdata[i][j], p[j]);
+				p[j][3] = -1;
 			} else {
-				p[j][0] = 0;
-				p[j][1] = 0;
-				p[j][2] = 0;
+				p[j][3] = 0;
 			}
 		}
 	}
@@ -161,6 +164,10 @@ gboolean canvas_expose(GtkWidget *canvas, GdkEventExpose *event, gpointer data)
 	if (!framebuf)
 		return TRUE;
 
+	gdk_draw_rectangle(canvas->window, bg_gc, TRUE,
+		event->area.x, event->area.y,
+		event->area.width, event->area.height);
+
 	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,
@@ -178,7 +185,7 @@ static int init_framedata(int reset)
 		return 0;
 
 	lbximg_getinfo(image, &info);
-	framebuf = gdk_pixbuf_new(GDK_COLORSPACE_RGB, FALSE, 8,
+	framebuf = gdk_pixbuf_new(GDK_COLORSPACE_RGB, TRUE, 8,
 		info.width, info.height);
 	if (!framebuf) {
 		printf("failed to allocate pixbuf\n");
@@ -427,6 +434,23 @@ static void interface_init(void)
 	gtk_combo_box_entry_set_text_column(GTK_COMBO_BOX_ENTRY(combo), 0);
 }
 
+GdkBitmap *init_bg(GdkDrawable *drawable, GdkGC *gc)
+{
+	GdkColor fg = { .red = 0x6666, .green = 0x6666, .blue = 0x6666 };
+	GdkColor bg = { .red = 0x9999, .green = 0x9999, .blue = 0x9999 };
+	GdkBitmap *bitmap;
+
+	bitmap = gdk_bitmap_create_from_data(drawable, bg_bits,
+		bg_width, bg_height);
+
+	gdk_gc_set_rgb_fg_color(gc, &fg);
+	gdk_gc_set_rgb_bg_color(gc, &bg);
+	gdk_gc_set_fill(gc, GDK_OPAQUE_STIPPLED);
+	gdk_gc_set_stipple(gc, bitmap);
+	gdk_gc_set_ts_origin(gc, 0, 0);
+	return bitmap;
+}
+
 int main(int argc, char **argv)
 {
 	GtkWidget *window;
@@ -456,5 +480,8 @@ int main(int argc, char **argv)
 
 	g_timeout_add(10, timeout, NULL);
 	gtk_widget_show_all(window);
+
+	bg_gc = gdk_gc_new(canvas->window);
+	init_bg(canvas->window, bg_gc);
 	gtk_main();
 }
-- 
2.43.0