add basic cairo demo functions

1 files changed, 174 insertions, 6 deletions

diff --git a/src/image/image.c b/src/image/image.c
index a8a0502..1c747e2 100644
--- a/src/image/image.c
+++ b/src/image/image.c
@@ -1,10 +1,61 @@
 #include <lua.h>
 #include <honeysuckle.h>
+#include <cairo/cairo.h>
 /* assimp provides its own stb_image implementation */
 /*#define STB_IMAGE_IMPLEMENTATION*/
 #include "stb_image.h"
 #include "image.h"
 
+
+int load_image(lua_State *L);
+int free_image(lua_State *L);
+
+int surface_create(lua_State *L);
+int surface_destroy(lua_State *L);
+int surface_get_data(lua_State *L);
+int context_create(lua_State *L);
+int context_destroy(lua_State *L);
+int context_select_font_face(lua_State *L);
+int context_set_font_size(lua_State *L);
+int context_show_text(lua_State *L);
+int context_set_source_rgb(lua_State *L);
+int context_move_to(lua_State *L);
+
+
+void setup_image(lua_State *L, int honey_index)
+{
+	hs_create_table(L,
+		/* basic images */
+		hs_str_cfunc("load", load_image),
+		hs_str_cfunc("destroy", free_image),
+
+		/* cairo bindings */
+		hs_str_cfunc("surface_create", surface_create),
+		hs_str_cfunc("surface_destroy", surface_destroy),
+		hs_str_cfunc("surface_get_data", surface_get_data),
+		hs_str_cfunc("context_create", context_create),
+		hs_str_cfunc("context_destroy", context_destroy),
+		hs_str_cfunc("context_select_font_face", context_select_font_face),
+		hs_str_cfunc("context_set_font_size", context_set_font_size),
+		hs_str_cfunc("context_show_text", context_show_text),
+		hs_str_cfunc("context_set_source_rgb", context_set_source_rgb),
+		hs_str_cfunc("context_move_to", context_move_to),
+
+		/* format enum */
+		hs_str_int("FORMAT_ARGB32", CAIRO_FORMAT_ARGB32),
+
+
+		/* font enums */
+		hs_str_int("FONT_SLANT_NORMAL", CAIRO_FONT_SLANT_NORMAL),
+		hs_str_int("FONT_WEIGHT_NORMAL", CAIRO_FONT_WEIGHT_NORMAL),
+	);
+
+	lua_setfield(L, honey_index, "image");
+}
+
+
+/* --===== basic images =====-- */
+
 int load_image(lua_State *L)
 {
 	char *filename;
@@ -33,12 +84,129 @@ int free_image(lua_State *L)
 }
 
 
-void setup_image(lua_State *L, int honey_index)
+/* --===== cairo bindings =====-- */
+
+int surface_create(lua_State *L)
 {
-	hs_create_table(L,
-		hs_str_cfunc("load", load_image),
-		hs_str_cfunc("destroy", free_image),
-	);
+	lua_Integer format, width, height;
+	hs_parse_args(L, hs_int(format), hs_int(width), hs_int(height));
 
-	lua_setfield(L, honey_index, "image");
+	cairo_surface_t *surface = cairo_image_surface_create(format, width, height);
+	cairo_status_t status = cairo_surface_status(surface);
+	if (status != CAIRO_STATUS_SUCCESS)
+		hs_throw_error(L, "error creating cairo surface: %s", cairo_status_to_string(status));
+	
+	lua_pushlightuserdata(L, surface);
+	return 1;
+}
+
+
+int surface_destroy(lua_State *L)
+{
+	void *surface_ptr;
+	hs_parse_args(L, hs_light(surface_ptr));
+	cairo_surface_t *surface = surface_ptr;
+
+	cairo_surface_destroy(surface);
+	return 0;
+}
+
+
+int surface_get_data(lua_State *L)
+{
+	void *surface_ptr;
+	hs_parse_args(L, hs_light(surface_ptr));
+	cairo_surface_t *surface = surface_ptr;
+
+	unsigned char *data = cairo_image_surface_get_data(surface);
+	lua_pushlightuserdata(L, data);
+	return 1;
+}
+
+
+int context_create(lua_State *L)
+{
+	void *surface_ptr;
+	hs_parse_args(L, hs_light(surface_ptr));
+	cairo_surface_t *surface = surface_ptr;
+
+	cairo_t *cr = cairo_create(surface);
+	cairo_status_t status = cairo_status(cr);
+	if (status != CAIRO_STATUS_SUCCESS)
+		hs_throw_error(L, "error creating cairo context: %s", cairo_status_to_string(status));
+	
+	lua_pushlightuserdata(L, cr);
+	return 1;
+}
+
+
+int context_destroy(lua_State *L)
+{
+	void *cr_ptr;
+	hs_parse_args(L, hs_light(cr_ptr));
+	cairo_t *cr = cr_ptr;
+
+	cairo_destroy(cr);
+	return 0;
+}
+
+
+int context_select_font_face(lua_State *L)
+{
+	void *cr_ptr;
+	char *family;
+	lua_Integer slant, weight;
+	hs_parse_args(L, hs_light(cr_ptr), hs_str(family), hs_int(slant), hs_int(weight));
+	cairo_t *cr = cr_ptr;
+
+	cairo_select_font_face(cr, family, slant, weight);
+	return 0;
+}
+
+
+int context_set_font_size(lua_State *L)
+{
+	void *cr_ptr;
+	lua_Number size;
+	hs_parse_args(L, hs_light(cr_ptr), hs_num(size));
+	cairo_t *cr = cr_ptr;
+
+	cairo_set_font_size(cr, size);
+	return 0;
+}
+
+
+int context_show_text(lua_State *L)
+{
+	void *cr_ptr;
+	char *str;
+	hs_parse_args(L, hs_light(cr_ptr), hs_str(str));
+	cairo_t *cr = cr_ptr;
+
+	cairo_show_text(cr, str);
+	return 0;
+}
+
+
+int context_set_source_rgb(lua_State *L)
+{
+	void *cr_ptr;
+	lua_Number r, g, b;
+	hs_parse_args(L, hs_light(cr_ptr), hs_num(r), hs_num(g), hs_num(b));
+	cairo_t *cr = cr_ptr;
+
+	cairo_set_source_rgb(cr, r, g, b);
+	return 0;
+}
+
+
+int context_move_to(lua_State *L)
+{
+	void *cr_ptr;
+	lua_Number x, y;
+	hs_parse_args(L, hs_light(cr_ptr), hs_num(x), hs_num(y));
+	cairo_t *cr = cr_ptr;
+
+	cairo_move_to(cr, x, y);
+	return 0;
 }