From b3dba22613de912b01ae27ba30c73dfe4c05a340 Mon Sep 17 00:00:00 2001
From: Thomas White <taw@bitwiz.org.uk>
Date: Thu, 10 Nov 2011 20:59:48 +0100
Subject: Basic background object rendering

---
 src/slide_render.c | 48 +++++++++++++++++++++++++++++++++++++++++++-----
 src/stylesheet.c   | 13 +++++++++++++
 src/stylesheet.h   | 36 ++++++++++++++++++++++++++++++++++--
 3 files changed, 90 insertions(+), 7 deletions(-)

diff --git a/src/slide_render.c b/src/slide_render.c
index 0eb6098..c3e5ee2 100644
--- a/src/slide_render.c
+++ b/src/slide_render.c
@@ -35,6 +35,45 @@
 #include "stylesheet.h"
 
 
+static void render_bgblock(cairo_t *cr, struct bgblock *b)
+{
+	GdkColor col1;
+	GdkColor col2;
+	cairo_pattern_t *patt;
+
+	cairo_rectangle(cr, b->min_x, b->min_y,
+	                    b->max_x - b->min_x,
+	                    b->max_y - b->min_y);
+
+	switch ( b->type ) {
+
+		case BGBLOCK_SOLID :
+		gdk_color_parse(b->colour1, &col1);
+		gdk_cairo_set_source_color(cr, &col1);
+		/* FIXME: Honour alpha as well */
+		cairo_fill(cr);
+		break;
+
+		case BGBLOCK_GRADIENT_Y :
+		patt = cairo_pattern_create_linear(0.0, b->min_y,
+		                                   0.0, b->max_y);
+		gdk_color_parse(b->colour1, &col1);
+		gdk_color_parse(b->colour2, &col2);
+		cairo_pattern_add_color_stop_rgb(patt, 0.0, col1.red/65535.0,
+		                                            col1.green/65535.0,
+		                                            col1.blue/65535.0);
+		cairo_pattern_add_color_stop_rgb(patt, 1.0, col2.red/65535.0,
+		                                            col2.green/65535.0,
+		                                            col2.blue/65535.0);
+		cairo_set_source(cr, patt);
+		cairo_fill(cr);
+		cairo_pattern_destroy(patt);
+		break;
+
+	}
+}
+
+
 static cairo_surface_t *render_slide(struct slide *s, int w, int h)
 {
 	cairo_surface_t *surf;
@@ -44,13 +83,12 @@ static cairo_surface_t *render_slide(struct slide *s, int w, int h)
 	surf = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, w, h);
 
 	cr = cairo_create(surf);
-
-	cairo_rectangle(cr, 0.0, 0.0, w, h);
-	cairo_set_source_rgb(cr, 1.0, 1.0, 1.0);
-	cairo_fill(cr);
-
 	cairo_scale(cr, w/s->parent->slide_width, h/s->parent->slide_height);
 
+	for ( i=0; i<s->parent->ss->n_bgblocks; i++ ) {
+		render_bgblock(cr, &s->parent->ss->bgblocks[i]);
+	}
+
 	for ( i=0; i<s->num_objects; i++ ) {
 
 		struct object *o = s->objects[i];
diff --git a/src/stylesheet.c b/src/stylesheet.c
index 323b3a4..a164029 100644
--- a/src/stylesheet.c
+++ b/src/stylesheet.c
@@ -570,6 +570,19 @@ void default_stylesheet(StyleSheet *ss)
 	sty->valign = V_CENTER;
 	sty->offset_x = +200.0;
 	sty->offset_y = -300.0;
+
+	ss->bgblocks = malloc(sizeof(struct bgblock));
+	ss->n_bgblocks = 1;
+	ss->bgblocks[0].type = BGBLOCK_GRADIENT_Y;
+	ss->bgblocks[0].min_x = 0.0;
+	ss->bgblocks[0].max_x = 1024.0;
+	ss->bgblocks[0].min_y = 0.0;
+	ss->bgblocks[0].max_y = 768.0;
+	ss->bgblocks[0].colour1 = strdup("#000000000000");
+	ss->bgblocks[0].alpha1 = 1.0;
+	ss->bgblocks[0].colour2 = strdup("#ffffffffffff");
+	ss->bgblocks[0].alpha2 = 1.0;
+
 }
 
 
diff --git a/src/stylesheet.h b/src/stylesheet.h
index cde0bcc..bdbf97e 100644
--- a/src/stylesheet.h
+++ b/src/stylesheet.h
@@ -70,10 +70,42 @@ struct style
 };
 
 
+enum bgblocktype
+{
+	BGBLOCK_SOLID,
+	BGBLOCK_GRADIENT_X,
+	BGBLOCK_GRADIENT_Y,
+	BGBLOCK_IMAGE,
+};
+
+
+struct bgblock
+{
+	enum bgblocktype type;
+	double           min_x;
+	double           max_x;
+	double           min_y;
+	double           max_y;
+
+	char            *colour1;
+	double           alpha1;
+	char            *colour2;
+	double           alpha2;
+
+	struct image    *image;
+	GdkPixbuf       *scaled_pb;
+	int              scaled_w;
+	int              scaled_h;
+};
+
+
 struct _stylesheet
 {
-	struct style **styles;
-	int            n_styles;
+	struct style  **styles;
+	int             n_styles;
+
+	struct bgblock *bgblocks;
+	int             n_bgblocks;
 
 	/* Background stuff */
 };
-- 
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