2 files changed, 50 insertions, 0 deletions
diff --git a/payloads/libpayload/drivers/video/graphics.c b/payloads/libpayload/drivers/video/graphics.c
index b4cdcdea69..52c003511c 100644
--- a/payloads/libpayload/drivers/video/graphics.c
+++ b/payloads/libpayload/drivers/video/graphics.c
@@ -611,3 +611,34 @@ int draw_bitmap_direct(const void *bitmap, size_t size,
 	return draw_bitmap_v3(top_left, &scale, &dim, &dim,
 			      &header, palette, pixel_array);
 }
+
+int get_bitmap_dimension(const void *bitmap, size_t sz, struct scale *dim_rel)
+{
+	struct bitmap_header_v3 header;
+	const struct bitmap_palette_element_v3 *palette;
+	const uint8_t *pixel_array;
+	struct vector dim, dim_org;
+	int rv;
+
+	if (cbgfx_init())
+		return CBGFX_ERROR_INIT;
+
+	/* Only v3 is supported now */
+	rv = parse_bitmap_header_v3(bitmap, sz,
+				    &header, &palette, &pixel_array, &dim_org);
+	if (rv)
+		return rv;
+
+	/* Calculate height and width of the image */
+	rv = calculate_dimension(&dim_org, dim_rel, &dim);
+	if (rv)
+		return rv;
+
+	/* Calculate size relative to the canvas */
+	dim_rel->x.n = dim.width;
+	dim_rel->x.d = canvas.size.width;
+	dim_rel->y.n = dim.height;
+	dim_rel->y.d = canvas.size.height;
+
+	return CBGFX_SUCCESS;
+}
diff --git a/payloads/libpayload/include/cbgfx.h b/payloads/libpayload/include/cbgfx.h
index 54d395395a..4ab4943075 100644
--- a/payloads/libpayload/include/cbgfx.h
+++ b/payloads/libpayload/include/cbgfx.h
@@ -148,3 +148,22 @@ int draw_bitmap(const void *bitmap, size_t size,
  */
 int draw_bitmap_direct(const void *bitmap, size_t size,
 		       const struct vector *top_left);
+
+/**
+ * Get width and height of projected image
+ *
+ * @param[in] bitmap	Pointer to the bitmap data, starting from file header
+ * @param[in] sz	Size of the bitmap data
+ * @param[i/o] dim_rel	Width and height of the image relative to the canvas
+ *                      width and height. They must not exceed 1 (=100%).
+ *                      On return, it contains automatically calculated width
+ *                      and/or height.
+ *
+ * @return CBGFX_* error codes
+ *
+ * It returns the width and height of the projected image. If the input height
+ * is zero, it's derived from the input width to keep the aspect ratio, and vice
+ * versa. If both are zero, the width and the height which can project the image
+ * in the original size are returned.
+ */
+int get_bitmap_dimension(const void *bitmap, size_t sz, struct scale *dim_rel);