---
doc/APIchanges | 3 +++
libavutil/display.c | 35 +++++++++++++++++++++++++++++++++++
libavutil/display.h | 26 ++++++++++++++++++++++++++
libavutil/version.h | 2 +-
4 files changed, 65 insertions(+), 1 deletion(-)
diff --git a/doc/APIchanges b/doc/APIchanges
index e4b2fc8799..9dc393d999 100644
--- a/doc/APIchanges
+++ b/doc/APIchanges
@@ -14,6 +14,9 @@ libavutil: 2021-04-27
API changes, most recent first:
+2022-09-19 - xxxxxxxxxx - lavu 57.38.100 - display.h
+ Add av_display_matrix_scale(), av_display_{h,v}scale_get()
+
2022-09-19 - xxxxxxxxxx - lavu 57.37.100 - opt.h
Add AV_OPT_FLAG_ARGUMENT.
Add av_arg_show() to print arguments to options.
diff --git a/libavutil/display.c b/libavutil/display.c
index d31061283c..434ed50104 100644
--- a/libavutil/display.c
+++ b/libavutil/display.c
@@ -48,6 +48,30 @@ double av_display_rotation_get(const int32_t matrix[9])
return -rotation;
}
+double av_display_hscale_get(const int32_t matrix[9])
+{
+ double scale;
+
+ scale = hypot(CONV_FP(matrix[0]), CONV_FP(matrix[1]));
+
+ if (scale == 0.0)
+ return NAN;
+
+ return scale;
+}
+
+double av_display_vscale_get(const int32_t matrix[9])
+{
+ double scale;
+
+ scale = hypot(CONV_FP(matrix[3]), CONV_FP(matrix[4]));
+
+ if (scale == 0.0)
+ return NAN;
+
+ return scale;
+}
+
void av_display_rotation_set(int32_t matrix[9], double angle)
{
double radians = -angle * M_PI / 180.0f;
@@ -72,3 +96,14 @@ void av_display_matrix_flip(int32_t matrix[9], int hflip,
int vflip)
for (i = 0; i < 9; i++)
matrix[i] *= flip[i % 3];
}
+
+void av_display_matrix_scale(int32_t matrix[9], double hscale, double vscale)
+{
+ // hscale
+ matrix[0] = CONV_DB(CONV_FP(matrix[0]) * hscale);
+ matrix[1] = CONV_DB(CONV_FP(matrix[1]) * hscale);
+
+ // vscale
+ matrix[3] = CONV_DB(CONV_FP(matrix[3]) * vscale);
+ matrix[4] = CONV_DB(CONV_FP(matrix[4]) * vscale);
+}
diff --git a/libavutil/display.h b/libavutil/display.h
index 31d8bef361..ef507eb521 100644
--- a/libavutil/display.h
+++ b/libavutil/display.h
@@ -86,6 +86,24 @@
*/
double av_display_rotation_get(const int32_t matrix[9]);
+/**
+ * Extract the horizontal scaling component of the transformation matrix.
+ *
+ * @param matrix the transformation matrix
+ * @return the horizontal scaling by which the transformation matrix scales
the frame
+ * in the horizontal direction.
+ */
+double av_display_hscale_get(const int32_t matrix[9]);
+
+/**
+ * Extract the vertical scaling component of the transformation matrix.
+ *
+ * @param matrix the transformation matrix
+ * @return the vertical scaling by which the transformation matrix scales the
frame
+ * in the vertical direction.
+ */
+double av_display_vscale_get(const int32_t matrix[9]);
+
/**
* Initialize a transformation matrix describing a pure clockwise
* rotation by the specified angle (in degrees).
@@ -105,6 +123,14 @@ void av_display_rotation_set(int32_t matrix[9], double
angle);
*/
void av_display_matrix_flip(int32_t matrix[9], int hflip, int vflip);
+/**
+ * Scale the input matrix horizontally and/or vertically.
+ *
+ * @param matrix an allocated transformation matrix
+ * @param hscale scale factor by which the matrix should be scaled horizontally
+ * @param vscale scale factor by which the matrix should be scaled vertically
+ */
+void av_display_matrix_scale(int32_t matrix[9], double hscale, double vscale);
/**
* @}
* @}
diff --git a/libavutil/version.h b/libavutil/version.h
index 9c44cef6aa..5aca550f45 100644
--- a/libavutil/version.h
+++ b/libavutil/version.h
@@ -79,7 +79,7 @@
*/
#define LIBAVUTIL_VERSION_MAJOR 57
-#define LIBAVUTIL_VERSION_MINOR 37
+#define LIBAVUTIL_VERSION_MINOR 38
#define LIBAVUTIL_VERSION_MICRO 100
#define LIBAVUTIL_VERSION_INT AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \
--
2.20.1 (Apple Git-117)
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