Add OnDiskBitmap which loads pixel data straight from disk.

Also, renamed Sprite's palette to pixel_shader so it can be
anything that produces colors based on values (including color values).
Added a ColorConverter that converts RGB888 (found in bitmaps) to
RGB565 for the display.

Fixes #1182

1 files changed, 47 insertions, 0 deletions

diff --git a/shared-module/displayio/OnDiskBitmap.h b/shared-module/displayio/OnDiskBitmap.h
new file mode 100644
index 000000000..31d6c9550
--- /dev/null
+++ b/shared-module/displayio/OnDiskBitmap.h
@@ -0,0 +1,47 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2018 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_SHARED_MODULE_DISPLAYIO_ONDISKBITMAP_H
+#define MICROPY_INCLUDED_SHARED_MODULE_DISPLAYIO_ONDISKBITMAP_H
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#include "py/obj.h"
+
+#include "extmod/vfs_fat.h"
+
+typedef struct {
+    mp_obj_base_t base;
+    uint16_t width;
+    uint16_t height;
+    uint16_t data_offset;
+    uint16_t stride;
+    pyb_file_obj_t* file;
+    uint8_t bytes_per_pixel;
+} displayio_ondiskbitmap_t;
+
+#endif // MICROPY_INCLUDED_SHARED_MODULE_DISPLAYIO_ONDISKBITMAP_H