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added a few functions to test for matrix properties 

Fri Jul  9 16:47:04 MEST 1999  Sven Neumann <sven@gimp.org>

        * libgimp/gimpmatrix.[ch]: added a few functions to test for
        matrix properties

        * app/transform_core.c: if we are doing a simple transformation
        (e.g. rotating by 90 degrees), turn off interpolation

        * app/rotate_tool.c: persuade the slider that a rotate angle of
        180 degrees is perfectly ok


--Sven
This commit is contained in:
MEST 1999 Sven Neumann 1999-07-09 14:51:01 +00:00 committed by Sven Neumann
parent 434915b03d
commit 0a6d8a2f4b
8 changed files with 113 additions and 7 deletions
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11
ChangeLog
View File

@ -1,3 +1,14 @@
Fri Jul 9 16:47:04 MEST 1999 Sven Neumann <sven@gimp.org>
* libgimp/gimpmatrix.[ch]: added a few functions to test for
matrix properties
* app/transform_core.c: if we are doing a simple transformation
(e.g. rotating by 90 degrees), turn off interpolation
* app/rotate_tool.c: persuade the slider that a rotate angle of
180 degrees is perfectly ok
1999-07-09 Michael Natterer <mitschel@cs.tu-berlin.de>
* app/crop.c: mysteriously, using the new tool constructor fixed

3
app/rotate_tool.c
View File

@ -95,8 +95,9 @@ rotate_tool_transform (Tool *tool,
tool);
gtk_spin_button_set_wrap (GTK_SPIN_BUTTON (widget), TRUE);
/* this looks strange (-180, 181), but it works */
widget = info_dialog_add_scale (transform_info, "", &angle_val,
-180, 180, 0.01, 0.1, 1, -1,
-180, 181, 0.01, 0.1, 1, -1,
(GtkSignalFunc) rotate_angle_changed,
tool);
gtk_widget_set_usize (widget, 180, 0);

3
app/tools/gimprotatetool.c
View File

@ -95,8 +95,9 @@ rotate_tool_transform (Tool *tool,
tool);
gtk_spin_button_set_wrap (GTK_SPIN_BUTTON (widget), TRUE);
/* this looks strange (-180, 181), but it works */
widget = info_dialog_add_scale (transform_info, "", &angle_val,
-180, 180, 0.01, 0.1, 1, -1,
-180, 181, 0.01, 0.1, 1, -1,
(GtkSignalFunc) rotate_angle_changed,
tool);
gtk_widget_set_usize (widget, 180, 0);

3
app/tools/rotate_tool.c
View File

@ -95,8 +95,9 @@ rotate_tool_transform (Tool *tool,
tool);
gtk_spin_button_set_wrap (GTK_SPIN_BUTTON (widget), TRUE);
/* this looks strange (-180, 181), but it works */
widget = info_dialog_add_scale (transform_info, "", &angle_val,
-180, 180, 0.01, 0.1, 1, -1,
-180, 181, 0.01, 0.1, 1, -1,
(GtkSignalFunc) rotate_angle_changed,
tool);
gtk_widget_set_usize (widget, 180, 0);

7
app/tools/transform_core.c
View File

@ -1026,6 +1026,10 @@ transform_core_do (GImage *gimage,
int newval;
alpha = 0;
/* turn interpolation off for simple transformations (e.g. rot90) */
if (gimp_matrix_is_simple (matrix))
interpolation = FALSE;
/* Get the background color */
gimage_get_background (gimage, drawable, bg_col);
@ -1062,7 +1066,7 @@ transform_core_do (GImage *gimage,
gimp_matrix_invert (matrix, m);
}
paths_transform_current_path(gimage,matrix,FALSE);
paths_transform_current_path (gimage, matrix, FALSE);
x1 = float_tiles->x;
y1 = float_tiles->y;
@ -1128,6 +1132,7 @@ transform_core_do (GImage *gimage,
ty = yinc * (tx1 + 0.5) + m[1][1] * (y + 0.5) + m[1][2];
tw = winc * (tx1 + 0.5) + m[2][1] * (y + 0.5) + m[2][2];
d = dest;
for (x = tx1; x < tx2; x++)
{
/* normalize homogeneous coords */

7
app/transform_core.c
View File

@ -1026,6 +1026,10 @@ transform_core_do (GImage *gimage,
int newval;
alpha = 0;
/* turn interpolation off for simple transformations (e.g. rot90) */
if (gimp_matrix_is_simple (matrix))
interpolation = FALSE;
/* Get the background color */
gimage_get_background (gimage, drawable, bg_col);
@ -1062,7 +1066,7 @@ transform_core_do (GImage *gimage,
gimp_matrix_invert (matrix, m);
}
paths_transform_current_path(gimage,matrix,FALSE);
paths_transform_current_path (gimage, matrix, FALSE);
x1 = float_tiles->x;
y1 = float_tiles->y;
@ -1128,6 +1132,7 @@ transform_core_do (GImage *gimage,
ty = yinc * (tx1 + 0.5) + m[1][1] * (y + 0.5) + m[1][2];
tw = winc * (tx1 + 0.5) + m[2][1] * (y + 0.5) + m[2][2];
d = dest;
for (x = tx1; x < tx2; x++)
{
/* normalize homogeneous coords */

76
libgimp/gimpmatrix.c
View File

@ -17,9 +17,12 @@
* Boston, MA 02111-1307, USA.
*/
#include "gimpmatrix.h"
#include <glib.h>
#include <math.h>
#include <string.h>
#include "gimpmatrix.h"
#define EPSILON 1e-6
void
gimp_matrix_transform_point (GimpMatrix m, double x, double y,
@ -175,5 +178,74 @@ gimp_matrix_invert (GimpMatrix m, GimpMatrix m_inv)
void
gimp_matrix_duplicate (GimpMatrix src, GimpMatrix target)
{
memcpy(&target[0][0], &src[0][0], sizeof(GimpMatrix));
memcpy (&target[0][0], &src[0][0], sizeof(GimpMatrix));
}
/* functions to test for matrix properties */
int
gimp_matrix_is_diagonal (GimpMatrix m)
{
int i,j;
for (i = 0; i < 3; i++)
{
for (j = 0; j < 3; j++)
{
if (i != j && fabs (m[i][j]) > EPSILON)
return FALSE;
}
}
return TRUE;
}
int
gimp_matrix_is_identity (GimpMatrix m)
{
int i,j;
for (i = 0; i < 3; i++)
{
for (j = 0; j < 3; j++)
{
if (i == j)
{
if (fabs (m[i][j] - 1.0) > EPSILON)
return FALSE;
}
else
{
if (fabs (m[i][j]) > EPSILON)
return FALSE;
}
}
}
return TRUE;
}
/* Check if we'll need to interpolate when applying this matrix.
This function returns TRUE if all entries of the upper left
2x2 matrix are either 0 or 1
*/
int
gimp_matrix_is_simple (GimpMatrix m)
{
double absm;
int i,j;
for (i = 0; i < 2; i++)
{
for (j = 0; j < 2; j++)
{
absm = fabs (m[i][j]);
if (absm > EPSILON && fabs (absm - 1.0) > EPSILON)
return FALSE;
}
}
return TRUE;
}

10
libgimp/gimpmatrix.h
View File

@ -38,9 +38,19 @@ void gimp_matrix_yshear (GimpMatrix, double);
double gimp_matrix_determinant (GimpMatrix);
void gimp_matrix_invert (GimpMatrix m, GimpMatrix m_inv);
void gimp_matrix_duplicate (GimpMatrix src, GimpMatrix target);
int gimp_matrix_is_diagonal (GimpMatrix m);
int gimp_matrix_is_identity (GimpMatrix m);
int gimp_matrix_is_simple (GimpMatrix m);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* __GIMPMATRIX_H__ */