Big glfw refactor

I did a lot of this in a very ad-hoc fashion with no proper commit
history. As such, the kindest thing to do seemed to be to just squash it
into this one commit.

1 files changed, 51 insertions, 0 deletions

diff --git a/src/canvas.h b/src/canvas.h
new file mode 100644
index 0000000..4f520fe
--- /dev/null
+++ b/src/canvas.h
@@ -0,0 +1,51 @@
+#ifndef IMV_CANVAS_H
+#define IMV_CANVAS_H
+
+struct imv_canvas;
+struct imv_image;
+
+enum upscaling_method {
+  UPSCALING_LINEAR,
+  UPSCALING_NEAREST_NEIGHBOUR,
+  UPSCALING_METHOD_COUNT,
+};
+
+/* Create a canvas instance */
+struct imv_canvas *imv_canvas_create(int width, int height);
+
+/* Clean up a canvas */
+void imv_canvas_free(struct imv_canvas *canvas);
+
+/* Set the buffer size of the canvas */
+void imv_canvas_resize(struct imv_canvas *canvas, int width, int height);
+
+/* Blank the canvas to be empty and transparent */
+void imv_canvas_clear(struct imv_canvas *canvas);
+
+/* Set the current drawing color of the canvas */
+void imv_canvas_color(struct imv_canvas *canvas, float r, float g, float b, float a);
+
+/* Fill a rectangle on the canvas with the current color */
+void imv_canvas_fill_rectangle(struct imv_canvas *canvas, int x, int y, int width, int height);
+
+/* Fill the whole canvas with the current color */
+void imv_canvas_fill(struct imv_canvas *canvas);
+
+/* Fill the whole canvas with a chequerboard pattern */
+void imv_canvas_fill_checkers(struct imv_canvas *canvas, int size);
+
+/* Select the font to draw text with */
+void imv_canvas_font(struct imv_canvas *canvas, const char *name, int size);
+
+/* Draw some text on the canvas */
+void imv_canvas_printf(struct imv_canvas *canvas, int x, int y, const char *fmt, ...);
+
+/* Blit the canvas to the current OpenGL framebuffer */
+void imv_canvas_draw(struct imv_canvas *canvas);
+
+/* Blit the given image to the current OpenGL framebuffer */
+void imv_canvas_draw_image(struct imv_canvas *canvas, struct imv_image *image,
+                           int x, int y, double scale,
+                           enum upscaling_method upscaling_method);
+
+#endif