cbgfx: add get_image_dimension

get_image_dimension returns the width or height of the image projected on
canvas.

This is necessary for example when two images of different lengths have to
be placed side by side in the center of the canvas and the widths of the
images must be adjusted according to the height.

BUG=chromium:502066
BRANCH=tot
TEST=Tested on Samus

Change-Id: I119c83891f48046e888b6b526e63348e74f8b77c
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Original-Commit-Id: d1a97f0492eb02f906feb5b879b7b43518dfa4d7
Original-Change-Id: Ie13f7994d639ea1556f73690b6b6b413ae64223c
Original-Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/304113
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/11929
Tested-by: build bot (Jenkins)

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);