From 6fb381247aa3f73ac1501489421a364ed79d03c4 Mon Sep 17 00:00:00 2001
From: "K. Lange" <klange@toaruos.org>
Date: Wed, 28 Nov 2018 20:39:57 +0900
Subject: [PATCH] graphics: subregions

---
 base/usr/include/toaru/graphics.h |  1 +
 lib/graphics.c                    | 16 ++++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/base/usr/include/toaru/graphics.h b/base/usr/include/toaru/graphics.h
index 6334f76a..3d73d50e 100644
--- a/base/usr/include/toaru/graphics.h
+++ b/base/usr/include/toaru/graphics.h
@@ -126,5 +126,6 @@ struct gradient_definition {
 
 extern uint32_t gfx_vertical_gradient_pattern(int32_t x, int32_t y, double alpha, void * extra);
 
+extern gfx_context_t * init_graphics_subregion(gfx_context_t * base, int x, int y, int width, int height);
 
 _End_C_Header
diff --git a/lib/graphics.c b/lib/graphics.c
index 1b5ab46c..64a2ddae 100644
--- a/lib/graphics.c
+++ b/lib/graphics.c
@@ -128,6 +128,22 @@ gfx_context_t * init_graphics_fullscreen_double_buffer() {
 	return out;
 }
 
+gfx_context_t * init_graphics_subregion(gfx_context_t * base, int x, int y, int width, int height) {
+	gfx_context_t * out = malloc(sizeof(gfx_context_t));
+
+	out->clips = NULL;
+	out->depth = 32;
+
+	out->width = width;
+	out->height = height;
+	out->stride = base->stride;
+	out->backbuffer = base->buffer + (base->stride * y) + x * 4;
+	out->buffer = base->buffer + (base->stride * y) + x * 4;
+
+	out->size = 0; /* don't allow flip or clear operations */
+	return out;
+}
+
 void reinit_graphics_fullscreen(gfx_context_t * out) {
 
 	ioctl(framebuffer_fd, IO_VID_WIDTH,  &out->width);