From 59ec0c5a10adc61b783ab197f116077ca55a5afa Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mario=20H=C3=BCttel?= <mario.huettel@gmx.net>
Date: Fri, 20 Jul 2018 22:32:23 +0200
Subject: [PATCH] cairo layer renderer

---
 cairo-output/cairo-output.c | 121 +++++++++++++++++++++++++++++++++++-
 cairo-output/cairo-output.h |   2 +-
 2 files changed, 121 insertions(+), 2 deletions(-)

diff --git a/cairo-output/cairo-output.c b/cairo-output/cairo-output.c
index 66813d6..b7f6cf0 100644
--- a/cairo-output/cairo-output.c
+++ b/cairo-output/cairo-output.c
@@ -29,6 +29,119 @@ struct cairo_layer {
 	struct layer_info *linfo;
 };
 
+static void revert_inherited_transform(struct cairo_layer *layers)
+{
+	int i;
+
+	for (i = 0; i < MAX_LAYERS; i++) {
+		if (layers[i].cr == NULL)
+				continue;
+		cairo_restore(layers[i].cr);
+	}
+}
+
+static void apply_inherited_transform_to_all_layers(struct cairo_layer *layers,
+						    const struct gds_point *origin,
+						    double magnification,
+						    gboolean flipping,
+						    double rotation,
+						    double scale)
+{
+	int i;
+	cairo_t *temp_layer_cr;
+
+	for (i = 0; i < MAX_LAYERS; i++) {
+		temp_layer_cr = layers[i].cr;
+		if (temp_layer_cr == NULL)
+			continue;
+
+		/* Save the state and apply transformation */
+		cairo_save(temp_layer_cr);
+		cairo_translate(temp_layer_cr, (double)origin->x/scale, (double)origin->y/scale);
+		cairo_rotate(temp_layer_cr, M_PI*rotation/180.0);
+		cairo_scale(temp_layer_cr, magnification,
+			    (flipping == TRUE ? -magnification : magnification));
+	}
+}
+
+static void render_cell(struct gds_cell *cell, struct cairo_layer *layers, double scale)
+{
+	GList *instance_list;
+	struct gds_cell *temp_cell;
+	struct gds_cell_instance *cell_instance;
+	GList *gfx_list;
+	struct gds_graphics *gfx;
+	GList *vertex_list;
+	struct gds_point *vertex;
+	cairo_t *cr;
+
+	/* Render child cells */
+	for (instance_list = cell->child_cells; instance_list != NULL; instance_list = instance_list->next) {
+		cell_instance = (struct gds_cell_instance *)instance_list->data;
+		if ((temp_cell = cell_instance->cell_ref) != NULL) {
+			apply_inherited_transform_to_all_layers(layers,
+								&cell_instance->origin,
+								cell_instance->magnification,
+								cell_instance->flipped,
+								cell_instance->angle,
+								scale);
+			render_cell(temp_cell, layers, scale);
+			revert_inherited_transform(layers);
+		}
+	}
+
+	/* Render graphics */
+	for (gfx_list = cell->graphic_objs; gfx_list != NULL; gfx_list = gfx_list->next) {
+		gfx = (struct gds_graphics *)gfx_list->data;
+
+		/* Get layer renderer */
+		if (gfx->layer >= MAX_LAYERS)
+			continue;
+		if ((cr = layers[gfx->layer].cr) == NULL)
+			continue;
+
+		/* Apply settings */
+		cairo_set_line_width(cr, (gfx->width_absolute ? gfx->width_absolute : 1));
+
+		switch (gfx->path_render_type) {
+		case PATH_FLUSH:
+			cairo_set_line_cap(cr, CAIRO_LINE_CAP_BUTT);
+			break;
+		case PATH_ROUNDED:
+			cairo_set_line_cap(cr, CAIRO_LINE_CAP_ROUND);
+			break;
+		case PATH_SQUARED:
+			cairo_set_line_cap(cr, CAIRO_LINE_CAP_SQUARE);
+			break;
+		}
+
+		/* Add vertices */
+		for (vertex_list = gfx->vertices; vertex_list != NULL; vertex_list = vertex_list->next) {
+			vertex = (struct gds_point *)vertex_list->data;
+
+			/* If first point -> move to, else line to */
+			if (vertex_list->prev == NULL)
+				cairo_move_to(cr, vertex->x/scale, vertex->y/scale);
+			else
+				cairo_line_to(cr, vertex->x/scale, vertex->y/scale);
+
+		}
+
+		/* Create graphics object */
+		switch (gfx->gfx_type) {
+		case GRAPHIC_PATH:
+			cairo_stroke(cr);
+			break;
+		case GRAPHIC_POLYGON:
+			cairo_close_path(cr);
+			cairo_fill(cr);
+			break;
+		}
+
+	}
+
+}
+
 void cairo_render_cell_to_pdf(struct gds_cell *cell, GList *layer_infos, char *pdf_file, double scale)
 {
 	cairo_surface_t *surface;
@@ -56,7 +169,8 @@ void cairo_render_cell_to_pdf(struct gds_cell *cell, GList *layer_infos, char *p
 			lay->rec = cairo_recording_surface_create(CAIRO_CONTENT_COLOR_ALPHA,
 								  NULL);
 			lay->cr = cairo_create(layers[(unsigned int)linfo->layer].rec);
-			cairo_scale(lay->cr, 1/scale, 1/scale);
+			cairo_scale(lay->cr, 1, -1); // Fix coordinate system
+			cairo_set_source_rgb(lay->cr, 1, 0, 0);
 		} else {
 			printf("Layer number (%d) too high!\n", linfo->layer);
 			goto ret_clear_layers;
@@ -64,6 +178,11 @@ void cairo_render_cell_to_pdf(struct gds_cell *cell, GList *layer_infos, char *p
 	}
 
 
+	render_cell(cell, layers, scale);
+
+	/* Todo: Tranfer all layers in order to output file */
+
+
 ret_clear_layers:
 	for (i = 0; i < MAX_LAYERS; i++) {
 		lay = &layers[i];
diff --git a/cairo-output/cairo-output.h b/cairo-output/cairo-output.h
index 3e6eb25..cf7aa4f 100644
--- a/cairo-output/cairo-output.h
+++ b/cairo-output/cairo-output.h
@@ -23,7 +23,7 @@
 #include "../layer-selector.h"
 #include "../gds-parser/gds-types.h"
 
-#define MAX_LAYERS (2048)
+#define MAX_LAYERS (300)
 
 void cairo_render_cell_to_pdf(struct gds_cell *cell, GList *layer_infos, char *pdf_file, double scale);