(wrong string) ée

From: <git_AT_suckless.org>
Date: Fri, 14 Jul 2017 21:17:39 +0200 (CEST)

commit ff0286325a3dd1f4fe7e29e78341b9bd63e1725c
Author: Mattias Andrée <maandree_AT_kth.se>
AuthorDate: Fri Jul 14 21:15:32 2017 +0200
Commit: Mattias Andrée <maandree_AT_kth.se>
CommitDate: Fri Jul 14 21:15:32 2017 +0200

    blind-matrix-{rotate,shear}: add -d
    
    Signed-off-by: Mattias Andrée <maandree_AT_kth.se>

diff --git a/man/blind-matrix-rotate.1 b/man/blind-matrix-rotate.1
index 31ec330..3c82a3b 100644
--- a/man/blind-matrix-rotate.1
+++ b/man/blind-matrix-rotate.1
_AT_@ -3,7 +3,7 @@
 blind-matrix-rotate - Create an affine 2D-transformation matrix for rotation
 .SH SYNOPSIS
 .B blind-matrix-rotate
-[-c]
+[-cd]
 .SH DESCRIPTION
 .B blind-matrix-rotate
 creates an affine 2D-transformation matrix for
_AT_@ -28,9 +28,21 @@ Create different matrices for each channel. Use
 values from each channel in stdin to create
 matrices whose values are stored in the same
 channels in stdout.
+.TP
+.B -d
+Input angles in degrees rather than radians.
 .SH NOTES
 The image is rotated anti-clockwise if the Y-axis
 grows upwards rather than downwards.
+.P
+Due to truncation error, when rotating a multiple
+of 90 degrees, it is preferable to use
+.B -d
+with lets
+.B blind-matrix-rotate
+eliminate the error. If this is not done,
+.BR blind-invert-matrix (1)
+may return odd results.
 .SH SEE ALSO
 .BR blind (7),
 .BR blind-from-text (1),
diff --git a/man/blind-matrix-shear.1 b/man/blind-matrix-shear.1
index 56d856d..a524cc5 100644
--- a/man/blind-matrix-shear.1
+++ b/man/blind-matrix-shear.1
_AT_@ -3,7 +3,7 @@
 blind-matrix-shear - Create an affine 2D-transformation matrix for shearing
 .SH SYNOPSIS
 .B blind-matrix-shear
-[-ac]
+[-a [-d]] [-c]
 .SH DESCRIPTION
 .B blind-matrix-shear
 creates an affine 2D-transformation matrix for
_AT_@ -37,6 +37,9 @@ Create different matrices for each channel. Use
 values from each channel in stdin to create
 matrices whose values are stored in the same
 channels in stdout.
+.TP
+.B -d
+Input angles in degrees rather than radians.
 .SH NOTES
 The description assumes the Y-axis grows downwards.
 .P
diff --git a/src/blind-matrix-rotate.c b/src/blind-matrix-rotate.c
index d45f2fd..0b0fc18 100644
--- a/src/blind-matrix-rotate.c
+++ b/src/blind-matrix-rotate.c
_AT_@ -1,9 +1,10 @@
 /* See LICENSE file for copyright and license details. */
 #include "common.h"
 
-USAGE("[-c]")
+USAGE("[-cd]")
 
 static int per_channel = 0;
+static int in_degrees = 0;
 
 #define PROCESS(TYPE)\
         do {\
_AT_@ -19,15 +20,25 @@ static int per_channel = 0;
                 }\
                 \
                 while (eread_frame(stream, buf)) {\
- if (per_channel) {\
+ if (per_channel && in_degrees) {\
+ for (i = 0; i < 4; i++) {\
+ matrix[4][i] = matrix[0][i] = degcos(buf[i]);\
+ matrix[3][i] = -(matrix[1][i] = degsin(buf[i]));\
+ }\
+ } else if (per_channel) {\
                                 for (i = 0; i < 4; i++) {\
                                         matrix[4][i] = matrix[0][i] = cos(buf[i]);\
                                         matrix[3][i] = -(matrix[1][i] = sin(buf[i]));\
                                 }\
                         } else {\
                                 buf[1] *= buf[3];\
- matrix[4][0] = matrix[0][0] = cos(buf[1]);\
- matrix[3][0] = -(matrix[1][0] = sin(buf[1]));\
+ if (in_degrees) {\
+ matrix[4][0] = matrix[0][0] = degcos(buf[1]);\
+ matrix[3][0] = -(matrix[1][0] = degsin(buf[1]));\
+ } else {\
+ matrix[4][0] = matrix[0][0] = cos(buf[1]);\
+ matrix[3][0] = -(matrix[1][0] = sin(buf[1]));\
+ }\
                                 matrix[0][3] = matrix[0][2] = matrix[0][1] = matrix[0][0];\
                                 matrix[1][3] = matrix[1][2] = matrix[1][1] = matrix[1][0];\
                                 matrix[3][3] = matrix[3][2] = matrix[3][1] = matrix[3][0];\
_AT_@ -50,6 +61,9 @@ main(int argc, char *argv[])
         case 'c':
                 per_channel = 1;
                 break;
+ case 'd':
+ in_degrees = 1;
+ break;
         default:
                 usage();
         } ARGEND;
diff --git a/src/blind-matrix-shear.c b/src/blind-matrix-shear.c
index a4c742b..0a4310e 100644
--- a/src/blind-matrix-shear.c
+++ b/src/blind-matrix-shear.c
_AT_@ -1,16 +1,18 @@
 /* See LICENSE file for copyright and license details. */
 #include "common.h"
 
-USAGE("[-ac]")
+USAGE("[-a [-d]][c]")
 
 static int by_angle = 0;
 static int per_channel = 0;
+static int in_degrees = 0;
 
 #define PROCESS(TYPE)\
         do {\
                 typedef TYPE pixel_t[4];\
                 pixel_t matrix[9];\
                 pixel_t buf[2];\
+ TYPE conv = in_degrees ? (TYPE)(M_PI / 180.) : 1;\
                 int i;\
                 \
                 for (i = 0; i < 4; i++) {\
_AT_@ -22,8 +24,8 @@ static int per_channel = 0;
                 while (eread_frame(stream, buf)) {\
                         if (by_angle) {\
                                 for (i = !per_channel; i < (per_channel ? 4 : 2); i++) {\
- buf[0][i] = tan(buf[0][i]);\
- buf[1][i] = tan(buf[1][i]);\
+ buf[0][i] = tan(buf[0][i] * conv);\
+ buf[1][i] = tan(buf[1][i] * conv);\
                                 }\
                         }\
                         if (per_channel) {\
_AT_@ -55,11 +57,14 @@ main(int argc, char *argv[])
         case 'c':
                 per_channel = 1;
                 break;
+ case 'd':
+ in_degrees = 1;
+ break;
         default:
                 usage();
         } ARGEND;
 
- if (argc)
+ if (argc || (in_degrees && !by_angle))
                 usage();
 
         eopen_stream(&stream, NULL);
diff --git a/src/video-math.h b/src/video-math.h
index 28ac4f2..47a6965 100644
--- a/src/video-math.h
+++ b/src/video-math.h
_AT_@ -31,6 +31,50 @@ posmodf(float a, float b)
         return x < 0 ? x + b : x;
 }
 
+static inline double
+degsin(double u)
+{
+ if (!fmod(u, 90)) {
+ int64_t v = u;
+ v = ((v / 90) % 4 + 4) % 4;
+ return ((double[]){0, 1, 0, -1})[v];
+ }
+ return sin(u * (M_PI / 180.0));
+}
+
+static inline float
+degsinf(float u)
+{
+ if (!fmodf(u, 90)) {
+ int64_t v = u;
+ v = ((v / 90) % 4 + 4) % 4;
+ return ((float[]){0, 1, 0, -1})[v];
+ }
+ return sin(u * (float)(M_PI / 180.0));
+}
+
+static inline double
+degcos(double u)
+{
+ if (!fmod(u, 90)) {
+ int64_t v = u;
+ v = ((v / 90) % 4 + 4) % 4;
+ return ((double[]){1, 0, -1, 0})[v];
+ }
+ return cos(u * (M_PI / 180.0));
+}
+
+static inline float
+degcosf(float u)
+{
+ if (!fmodf(u, 90)) {
+ int64_t v = u;
+ v = ((v / 90) % 4 + 4) % 4;
+ return ((float[]){1, 0, -1, 0})[v];
+ }
+ return cos(u * (float)(M_PI / 180.0));
+}
+
 #define GENERIC(TYPE, FUNC, ...)\
         TYPE: FUNC(__VA_ARGS__),\
         TYPE *: FUNC(__VA_ARGS__),\
_AT_@ -73,6 +117,8 @@ posmodf(float a, float b)
 #define sin(...) MATH_GENERIC_1(sin, __VA_ARGS__)
 #define tan(...) MATH_GENERIC_1(tan, __VA_ARGS__)
 #define atan2(...) MATH_GENERIC_N(atan2, __VA_ARGS__)
+#define degcos(...) MATH_GENERIC_1(degcos, __VA_ARGS__)
+#define degsin(...) MATH_GENERIC_1(degsin, __VA_ARGS__)
 
 #define srgb_encode(...) BLIND_GENERIC_1(srgb_encode, __VA_ARGS__)
 #define srgb_decode(...) BLIND_GENERIC_1(srgb_decode, __VA_ARGS__)
Received on Fri Jul 14 2017 - 21:17:39 CEST

This archive was generated by hypermail 2.3.0 : Fri Jul 14 2017 - 21:26:41 CEST