diff options
Diffstat (limited to 'app/display/gimpdisplayshell-transform.c')
| -rw-r--r-- | app/display/gimpdisplayshell-transform.c | 1025 |
1 files changed, 1025 insertions, 0 deletions
diff --git a/app/display/gimpdisplayshell-transform.c b/app/display/gimpdisplayshell-transform.c new file mode 100644 index 0000000..f9cd2e5 --- /dev/null +++ b/app/display/gimpdisplayshell-transform.c @@ -0,0 +1,1025 @@ +/* GIMP - The GNU Image Manipulation Program + * Copyright (C) 1995 Spencer Kimball and Peter Mattis + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <https://www.gnu.org/licenses/>. + */ + +#include "config.h" + +#include <math.h> + +#include <gegl.h> +#include <gtk/gtk.h> + +#include "libgimpmath/gimpmath.h" + +#include "display-types.h" + +#include "core/gimpboundary.h" +#include "core/gimpdrawable.h" +#include "core/gimpimage.h" +#include "core/gimp-utils.h" + +#include "gimpdisplay.h" +#include "gimpdisplayshell.h" +#include "gimpdisplayshell-scroll.h" +#include "gimpdisplayshell-transform.h" + + +/* local function prototypes */ + +static void gimp_display_shell_transform_xy_f_noround (GimpDisplayShell *shell, + gdouble x, + gdouble y, + gdouble *nx, + gdouble *ny); + +/* public functions */ + +/** + * gimp_display_shell_zoom_coords: + * @shell: a #GimpDisplayShell + * @image_coords: image coordinates + * @display_coords: returns the corresponding display coordinates + * + * Zooms from image coordinates to display coordinates, so that + * objects can be rendered at the correct points on the display. + **/ +void +gimp_display_shell_zoom_coords (GimpDisplayShell *shell, + const GimpCoords *image_coords, + GimpCoords *display_coords) +{ + g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell)); + g_return_if_fail (image_coords != NULL); + g_return_if_fail (display_coords != NULL); + + *display_coords = *image_coords; + + display_coords->x = SCALEX (shell, image_coords->x); + display_coords->y = SCALEY (shell, image_coords->y); + + display_coords->x -= shell->offset_x; + display_coords->y -= shell->offset_y; +} + +/** + * gimp_display_shell_unzoom_coords: + * @shell: a #GimpDisplayShell + * @display_coords: display coordinates + * @image_coords: returns the corresponding image coordinates + * + * Zooms from display coordinates to image coordinates, so that + * points on the display can be mapped to points in the image. + **/ +void +gimp_display_shell_unzoom_coords (GimpDisplayShell *shell, + const GimpCoords *display_coords, + GimpCoords *image_coords) +{ + g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell)); + g_return_if_fail (display_coords != NULL); + g_return_if_fail (image_coords != NULL); + + *image_coords = *display_coords; + + image_coords->x += shell->offset_x; + image_coords->y += shell->offset_y; + + image_coords->x /= shell->scale_x; + image_coords->y /= shell->scale_y; +} + +/** + * gimp_display_shell_zoom_xy: + * @shell: + * @x: + * @y: + * @nx: + * @ny: + * + * Zooms an image coordinate to a shell coordinate. + **/ +void +gimp_display_shell_zoom_xy (GimpDisplayShell *shell, + gdouble x, + gdouble y, + gint *nx, + gint *ny) +{ + gint64 tx; + gint64 ty; + + g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell)); + g_return_if_fail (nx != NULL); + g_return_if_fail (ny != NULL); + + tx = x * shell->scale_x; + ty = y * shell->scale_y; + + tx -= shell->offset_x; + ty -= shell->offset_y; + + /* The projected coordinates might overflow a gint in the case of + * big images at high zoom levels, so we clamp them here to avoid + * problems. + */ + *nx = CLAMP (tx, G_MININT, G_MAXINT); + *ny = CLAMP (ty, G_MININT, G_MAXINT); +} + +/** + * gimp_display_shell_unzoom_xy: + * @shell: a #GimpDisplayShell + * @x: x coordinate in display coordinates + * @y: y coordinate in display coordinates + * @nx: returns x oordinate in image coordinates + * @ny: returns y coordinate in image coordinates + * @round: if %TRUE, round the results to the nearest integer; + * if %FALSE, simply cast them to @gint. + * + * Zoom from display coordinates to image coordinates, so that + * points on the display can be mapped to the corresponding points + * in the image. + **/ +void +gimp_display_shell_unzoom_xy (GimpDisplayShell *shell, + gint x, + gint y, + gint *nx, + gint *ny, + gboolean round) +{ + gint64 tx; + gint64 ty; + + g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell)); + g_return_if_fail (nx != NULL); + g_return_if_fail (ny != NULL); + + if (round) + { + tx = SIGNED_ROUND (((gdouble) x + shell->offset_x) / shell->scale_x); + ty = SIGNED_ROUND (((gdouble) y + shell->offset_y) / shell->scale_y); + } + else + { + tx = ((gint64) x + shell->offset_x) / shell->scale_x; + ty = ((gint64) y + shell->offset_y) / shell->scale_y; + } + + *nx = CLAMP (tx, G_MININT, G_MAXINT); + *ny = CLAMP (ty, G_MININT, G_MAXINT); +} + +/** + * gimp_display_shell_zoom_xy_f: + * @shell: a #GimpDisplayShell + * @x: image x coordinate of point + * @y: image y coordinate of point + * @nx: returned shell canvas x coordinate + * @ny: returned shell canvas y coordinate + * + * Zooms from image coordinates to display shell canvas + * coordinates. + **/ +void +gimp_display_shell_zoom_xy_f (GimpDisplayShell *shell, + gdouble x, + gdouble y, + gdouble *nx, + gdouble *ny) +{ + g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell)); + g_return_if_fail (nx != NULL); + g_return_if_fail (ny != NULL); + + *nx = SCALEX (shell, x) - shell->offset_x; + *ny = SCALEY (shell, y) - shell->offset_y; +} + +/** + * gimp_display_shell_unzoom_xy_f: + * @shell: a #GimpDisplayShell + * @x: x coordinate in display coordinates + * @y: y coordinate in display coordinates + * @nx: place to return x coordinate in image coordinates + * @ny: place to return y coordinate in image coordinates + * + * This function is identical to gimp_display_shell_unzoom_xy(), + * except that the input and output coordinates are doubles rather than + * ints, and consequently there is no option related to rounding. + **/ +void +gimp_display_shell_unzoom_xy_f (GimpDisplayShell *shell, + gdouble x, + gdouble y, + gdouble *nx, + gdouble *ny) +{ + g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell)); + g_return_if_fail (nx != NULL); + g_return_if_fail (ny != NULL); + + *nx = (x + shell->offset_x) / shell->scale_x; + *ny = (y + shell->offset_y) / shell->scale_y; +} + +/** + * gimp_display_shell_zoom_segments: + * @shell: a #GimpDisplayShell + * @src_segs: array of segments in image coordinates + * @dest_segs: returns the corresponding segments in display coordinates + * @n_segs: number of segments + * + * Zooms from image coordinates to display coordinates, so that + * objects can be rendered at the correct points on the display. + **/ +void +gimp_display_shell_zoom_segments (GimpDisplayShell *shell, + const GimpBoundSeg *src_segs, + GimpSegment *dest_segs, + gint n_segs, + gdouble offset_x, + gdouble offset_y) +{ + gint i; + + g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell)); + + for (i = 0; i < n_segs ; i++) + { + gdouble x1, x2; + gdouble y1, y2; + + x1 = src_segs[i].x1 + offset_x; + x2 = src_segs[i].x2 + offset_x; + y1 = src_segs[i].y1 + offset_y; + y2 = src_segs[i].y2 + offset_y; + + dest_segs[i].x1 = SCALEX (shell, x1) - shell->offset_x; + dest_segs[i].x2 = SCALEX (shell, x2) - shell->offset_x; + dest_segs[i].y1 = SCALEY (shell, y1) - shell->offset_y; + dest_segs[i].y2 = SCALEY (shell, y2) - shell->offset_y; + } +} + +/** + * gimp_display_shell_rotate_coords: + * @shell: a #GimpDisplayShell + * @image_coords: unrotated display coordinates + * @display_coords: returns the corresponding rotated display coordinates + * + * Rotates from unrotated display coordinates to rotated display + * coordinates, so that objects can be rendered at the correct points + * on the display. + **/ +void +gimp_display_shell_rotate_coords (GimpDisplayShell *shell, + const GimpCoords *unrotated_coords, + GimpCoords *rotated_coords) +{ + g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell)); + g_return_if_fail (unrotated_coords != NULL); + g_return_if_fail (rotated_coords != NULL); + + *rotated_coords = *unrotated_coords; + + if (shell->rotate_transform) + cairo_matrix_transform_point (shell->rotate_transform, + &rotated_coords->x, + &rotated_coords->y); +} + +/** + * gimp_display_shell_unrotate_coords: + * @shell: a #GimpDisplayShell + * @display_coords: rotated display coordinates + * @image_coords: returns the corresponding unrotated display coordinates + * + * Rotates from rotated display coordinates to unrotated display coordinates. + **/ +void +gimp_display_shell_unrotate_coords (GimpDisplayShell *shell, + const GimpCoords *rotated_coords, + GimpCoords *unrotated_coords) +{ + g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell)); + g_return_if_fail (rotated_coords != NULL); + g_return_if_fail (unrotated_coords != NULL); + + *unrotated_coords = *rotated_coords; + + if (shell->rotate_untransform) + cairo_matrix_transform_point (shell->rotate_untransform, + &unrotated_coords->x, + &unrotated_coords->y); +} + +/** + * gimp_display_shell_rotate_xy: + * @shell: + * @x: + * @y: + * @nx: + * @ny: + * + * Rotates an unrotated display coordinate to a rotated shell coordinate. + **/ +void +gimp_display_shell_rotate_xy (GimpDisplayShell *shell, + gdouble x, + gdouble y, + gint *nx, + gint *ny) +{ + gint64 tx; + gint64 ty; + + g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell)); + g_return_if_fail (nx != NULL); + g_return_if_fail (ny != NULL); + + if (shell->rotate_transform) + cairo_matrix_transform_point (shell->rotate_transform, &x, &y); + + tx = x; + ty = y; + + /* The projected coordinates might overflow a gint in the case of + * big images at high zoom levels, so we clamp them here to avoid + * problems. + */ + *nx = CLAMP (tx, G_MININT, G_MAXINT); + *ny = CLAMP (ty, G_MININT, G_MAXINT); +} + +/** + * gimp_display_shell_unrotate_xy: + * @shell: a #GimpDisplayShell + * @x: x coordinate in rotated display coordinates + * @y: y coordinate in rotated display coordinates + * @nx: returns x oordinate in unrotated display coordinates + * @ny: returns y coordinate in unrotated display coordinates + * + * Rotate from rotated display coordinates to unrotated display + * coordinates. + **/ +void +gimp_display_shell_unrotate_xy (GimpDisplayShell *shell, + gint x, + gint y, + gint *nx, + gint *ny) +{ + g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell)); + g_return_if_fail (nx != NULL); + g_return_if_fail (ny != NULL); + + if (shell->rotate_untransform) + { + gdouble fx = x; + gdouble fy = y; + + cairo_matrix_transform_point (shell->rotate_untransform, &fx, &fy); + + *nx = CLAMP (fx, G_MININT, G_MAXINT); + *ny = CLAMP (fy, G_MININT, G_MAXINT); + } + else + { + *nx = x; + *ny = y; + } +} + +/** + * gimp_display_shell_rotate_xy_f: + * @shell: a #GimpDisplayShell + * @x: image x coordinate of point + * @y: image y coordinate of point + * @nx: returned shell canvas x coordinate + * @ny: returned shell canvas y coordinate + * + * Rotates from untransformed display coordinates to rotated display + * coordinates. + **/ +void +gimp_display_shell_rotate_xy_f (GimpDisplayShell *shell, + gdouble x, + gdouble y, + gdouble *nx, + gdouble *ny) +{ + g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell)); + g_return_if_fail (nx != NULL); + g_return_if_fail (ny != NULL); + + *nx = x; + *ny = y; + + if (shell->rotate_transform) + cairo_matrix_transform_point (shell->rotate_transform, nx, ny); +} + +/** + * gimp_display_shell_unrotate_xy_f: + * @shell: a #GimpDisplayShell + * @x: x coordinate in rotated display coordinates + * @y: y coordinate in rotated display coordinates + * @nx: place to return x coordinate in unrotated display coordinates + * @ny: place to return y coordinate in unrotated display coordinates + * + * This function is identical to gimp_display_shell_unrotate_xy(), + * except that the input and output coordinates are doubles rather + * than ints. + **/ +void +gimp_display_shell_unrotate_xy_f (GimpDisplayShell *shell, + gdouble x, + gdouble y, + gdouble *nx, + gdouble *ny) +{ + g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell)); + g_return_if_fail (nx != NULL); + g_return_if_fail (ny != NULL); + + *nx = x; + *ny = y; + + if (shell->rotate_untransform) + cairo_matrix_transform_point (shell->rotate_untransform, nx, ny); +} + +void +gimp_display_shell_rotate_bounds (GimpDisplayShell *shell, + gdouble x1, + gdouble y1, + gdouble x2, + gdouble y2, + gdouble *nx1, + gdouble *ny1, + gdouble *nx2, + gdouble *ny2) +{ + + g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell)); + + if (shell->rotate_transform) + { + gdouble tx1 = x1; + gdouble ty1 = y1; + gdouble tx2 = x1; + gdouble ty2 = y2; + gdouble tx3 = x2; + gdouble ty3 = y1; + gdouble tx4 = x2; + gdouble ty4 = y2; + + cairo_matrix_transform_point (shell->rotate_transform, &tx1, &ty1); + cairo_matrix_transform_point (shell->rotate_transform, &tx2, &ty2); + cairo_matrix_transform_point (shell->rotate_transform, &tx3, &ty3); + cairo_matrix_transform_point (shell->rotate_transform, &tx4, &ty4); + + *nx1 = MIN4 (tx1, tx2, tx3, tx4); + *ny1 = MIN4 (ty1, ty2, ty3, ty4); + *nx2 = MAX4 (tx1, tx2, tx3, tx4); + *ny2 = MAX4 (ty1, ty2, ty3, ty4); + } + else + { + *nx1 = x1; + *ny1 = y1; + *nx2 = x2; + *ny2 = y2; + } +} + +void +gimp_display_shell_unrotate_bounds (GimpDisplayShell *shell, + gdouble x1, + gdouble y1, + gdouble x2, + gdouble y2, + gdouble *nx1, + gdouble *ny1, + gdouble *nx2, + gdouble *ny2) +{ + g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell)); + + if (shell->rotate_untransform) + { + gdouble tx1 = x1; + gdouble ty1 = y1; + gdouble tx2 = x1; + gdouble ty2 = y2; + gdouble tx3 = x2; + gdouble ty3 = y1; + gdouble tx4 = x2; + gdouble ty4 = y2; + + cairo_matrix_transform_point (shell->rotate_untransform, &tx1, &ty1); + cairo_matrix_transform_point (shell->rotate_untransform, &tx2, &ty2); + cairo_matrix_transform_point (shell->rotate_untransform, &tx3, &ty3); + cairo_matrix_transform_point (shell->rotate_untransform, &tx4, &ty4); + + *nx1 = MIN4 (tx1, tx2, tx3, tx4); + *ny1 = MIN4 (ty1, ty2, ty3, ty4); + *nx2 = MAX4 (tx1, tx2, tx3, tx4); + *ny2 = MAX4 (ty1, ty2, ty3, ty4); + } + else + { + *nx1 = x1; + *ny1 = y1; + *nx2 = x2; + *ny2 = y2; + } +} + +/** + * gimp_display_shell_transform_coords: + * @shell: a #GimpDisplayShell + * @image_coords: image coordinates + * @display_coords: returns the corresponding display coordinates + * + * Transforms from image coordinates to display coordinates, so that + * objects can be rendered at the correct points on the display. + **/ +void +gimp_display_shell_transform_coords (GimpDisplayShell *shell, + const GimpCoords *image_coords, + GimpCoords *display_coords) +{ + g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell)); + g_return_if_fail (image_coords != NULL); + g_return_if_fail (display_coords != NULL); + + *display_coords = *image_coords; + + display_coords->x = SCALEX (shell, image_coords->x); + display_coords->y = SCALEY (shell, image_coords->y); + + display_coords->x -= shell->offset_x; + display_coords->y -= shell->offset_y; + + if (shell->rotate_transform) + cairo_matrix_transform_point (shell->rotate_transform, + &display_coords->x, + &display_coords->y); +} + +/** + * gimp_display_shell_untransform_coords: + * @shell: a #GimpDisplayShell + * @display_coords: display coordinates + * @image_coords: returns the corresponding image coordinates + * + * Transforms from display coordinates to image coordinates, so that + * points on the display can be mapped to points in the image. + **/ +void +gimp_display_shell_untransform_coords (GimpDisplayShell *shell, + const GimpCoords *display_coords, + GimpCoords *image_coords) +{ + g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell)); + g_return_if_fail (display_coords != NULL); + g_return_if_fail (image_coords != NULL); + + *image_coords = *display_coords; + + if (shell->rotate_untransform) + cairo_matrix_transform_point (shell->rotate_untransform, + &image_coords->x, + &image_coords->y); + + image_coords->x += shell->offset_x; + image_coords->y += shell->offset_y; + + image_coords->x /= shell->scale_x; + image_coords->y /= shell->scale_y; + + image_coords->xscale = shell->scale_x; + image_coords->yscale = shell->scale_y; + image_coords->angle = shell->rotate_angle / 360.0; + image_coords->reflect = shell->flip_horizontally ^ shell->flip_vertically; + + if (shell->flip_vertically) + image_coords->angle += 0.5; +} + +/** + * gimp_display_shell_transform_xy: + * @shell: + * @x: + * @y: + * @nx: + * @ny: + * + * Transforms an image coordinate to a shell coordinate. + **/ +void +gimp_display_shell_transform_xy (GimpDisplayShell *shell, + gdouble x, + gdouble y, + gint *nx, + gint *ny) +{ + gint64 tx; + gint64 ty; + + g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell)); + g_return_if_fail (nx != NULL); + g_return_if_fail (ny != NULL); + + tx = x * shell->scale_x; + ty = y * shell->scale_y; + + tx -= shell->offset_x; + ty -= shell->offset_y; + + if (shell->rotate_transform) + { + gdouble fx = tx; + gdouble fy = ty; + + cairo_matrix_transform_point (shell->rotate_transform, &fx, &fy); + + tx = fx; + ty = fy; + } + + /* The projected coordinates might overflow a gint in the case of + * big images at high zoom levels, so we clamp them here to avoid + * problems. + */ + *nx = CLAMP (tx, G_MININT, G_MAXINT); + *ny = CLAMP (ty, G_MININT, G_MAXINT); +} + +/** + * gimp_display_shell_untransform_xy: + * @shell: a #GimpDisplayShell + * @x: x coordinate in display coordinates + * @y: y coordinate in display coordinates + * @nx: returns x oordinate in image coordinates + * @ny: returns y coordinate in image coordinates + * @round: if %TRUE, round the results to the nearest integer; + * if %FALSE, simply cast them to @gint. + * + * Transform from display coordinates to image coordinates, so that + * points on the display can be mapped to the corresponding points + * in the image. + **/ +void +gimp_display_shell_untransform_xy (GimpDisplayShell *shell, + gint x, + gint y, + gint *nx, + gint *ny, + gboolean round) +{ + gint64 tx; + gint64 ty; + + g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell)); + g_return_if_fail (nx != NULL); + g_return_if_fail (ny != NULL); + + if (shell->rotate_untransform) + { + gdouble fx = x; + gdouble fy = y; + + cairo_matrix_transform_point (shell->rotate_untransform, &fx, &fy); + + x = fx; + y = fy; + } + + if (round) + { + tx = SIGNED_ROUND (((gdouble) x + shell->offset_x) / shell->scale_x); + ty = SIGNED_ROUND (((gdouble) y + shell->offset_y) / shell->scale_y); + } + else + { + tx = ((gint64) x + shell->offset_x) / shell->scale_x; + ty = ((gint64) y + shell->offset_y) / shell->scale_y; + } + + *nx = CLAMP (tx, G_MININT, G_MAXINT); + *ny = CLAMP (ty, G_MININT, G_MAXINT); +} + +/** + * gimp_display_shell_transform_xy_f: + * @shell: a #GimpDisplayShell + * @x: image x coordinate of point + * @y: image y coordinate of point + * @nx: returned shell canvas x coordinate + * @ny: returned shell canvas y coordinate + * + * Transforms from image coordinates to display shell canvas + * coordinates. + **/ +void +gimp_display_shell_transform_xy_f (GimpDisplayShell *shell, + gdouble x, + gdouble y, + gdouble *nx, + gdouble *ny) +{ + g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell)); + g_return_if_fail (nx != NULL); + g_return_if_fail (ny != NULL); + + *nx = SCALEX (shell, x) - shell->offset_x; + *ny = SCALEY (shell, y) - shell->offset_y; + + if (shell->rotate_transform) + cairo_matrix_transform_point (shell->rotate_transform, nx, ny); +} + +/** + * gimp_display_shell_untransform_xy_f: + * @shell: a #GimpDisplayShell + * @x: x coordinate in display coordinates + * @y: y coordinate in display coordinates + * @nx: place to return x coordinate in image coordinates + * @ny: place to return y coordinate in image coordinates + * + * This function is identical to gimp_display_shell_untransform_xy(), + * except that the input and output coordinates are doubles rather than + * ints, and consequently there is no option related to rounding. + **/ +void +gimp_display_shell_untransform_xy_f (GimpDisplayShell *shell, + gdouble x, + gdouble y, + gdouble *nx, + gdouble *ny) +{ + g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell)); + g_return_if_fail (nx != NULL); + g_return_if_fail (ny != NULL); + + if (shell->rotate_untransform) + cairo_matrix_transform_point (shell->rotate_untransform, &x, &y); + + *nx = (x + shell->offset_x) / shell->scale_x; + *ny = (y + shell->offset_y) / shell->scale_y; +} + +void +gimp_display_shell_transform_bounds (GimpDisplayShell *shell, + gdouble x1, + gdouble y1, + gdouble x2, + gdouble y2, + gdouble *nx1, + gdouble *ny1, + gdouble *nx2, + gdouble *ny2) +{ + g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell)); + g_return_if_fail (nx1 != NULL); + g_return_if_fail (ny1 != NULL); + g_return_if_fail (nx2 != NULL); + g_return_if_fail (ny2 != NULL); + + if (shell->rotate_transform) + { + gdouble tx1, ty1; + gdouble tx2, ty2; + gdouble tx3, ty3; + gdouble tx4, ty4; + + gimp_display_shell_transform_xy_f_noround (shell, x1, y1, &tx1, &ty1); + gimp_display_shell_transform_xy_f_noround (shell, x1, y2, &tx2, &ty2); + gimp_display_shell_transform_xy_f_noround (shell, x2, y1, &tx3, &ty3); + gimp_display_shell_transform_xy_f_noround (shell, x2, y2, &tx4, &ty4); + + *nx1 = MIN4 (tx1, tx2, tx3, tx4); + *ny1 = MIN4 (ty1, ty2, ty3, ty4); + *nx2 = MAX4 (tx1, tx2, tx3, tx4); + *ny2 = MAX4 (ty1, ty2, ty3, ty4); + } + else + { + gimp_display_shell_transform_xy_f_noround (shell, x1, y1, nx1, ny1); + gimp_display_shell_transform_xy_f_noround (shell, x2, y2, nx2, ny2); + } +} + +void +gimp_display_shell_untransform_bounds (GimpDisplayShell *shell, + gdouble x1, + gdouble y1, + gdouble x2, + gdouble y2, + gdouble *nx1, + gdouble *ny1, + gdouble *nx2, + gdouble *ny2) +{ + g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell)); + g_return_if_fail (nx1 != NULL); + g_return_if_fail (ny1 != NULL); + g_return_if_fail (nx2 != NULL); + g_return_if_fail (ny2 != NULL); + + if (shell->rotate_untransform) + { + gdouble tx1, ty1; + gdouble tx2, ty2; + gdouble tx3, ty3; + gdouble tx4, ty4; + + gimp_display_shell_untransform_xy_f (shell, x1, y1, &tx1, &ty1); + gimp_display_shell_untransform_xy_f (shell, x1, y2, &tx2, &ty2); + gimp_display_shell_untransform_xy_f (shell, x2, y1, &tx3, &ty3); + gimp_display_shell_untransform_xy_f (shell, x2, y2, &tx4, &ty4); + + *nx1 = MIN4 (tx1, tx2, tx3, tx4); + *ny1 = MIN4 (ty1, ty2, ty3, ty4); + *nx2 = MAX4 (tx1, tx2, tx3, tx4); + *ny2 = MAX4 (ty1, ty2, ty3, ty4); + } + else + { + gimp_display_shell_untransform_xy_f (shell, x1, y1, nx1, ny1); + gimp_display_shell_untransform_xy_f (shell, x2, y2, nx2, ny2); + } +} + +/* transforms a bounding box from image-space, uniformly scaled by a factor of + * 'scale', to display-space. this is equivalent to, but more accurate than, + * dividing the input by 'scale', and using + * gimp_display_shell_transform_bounds(), in particular, in that if 'scale' + * equals 'shell->scale_x' or 'shell->scale_y', there is no loss in accuracy + * in the corresponding dimension due to scaling (although there might be loss + * of accuracy due to rotation or translation.) + */ +void +gimp_display_shell_transform_bounds_with_scale (GimpDisplayShell *shell, + gdouble scale, + gdouble x1, + gdouble y1, + gdouble x2, + gdouble y2, + gdouble *nx1, + gdouble *ny1, + gdouble *nx2, + gdouble *ny2) +{ + gdouble factor_x; + gdouble factor_y; + + g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell)); + g_return_if_fail (scale > 0.0); + g_return_if_fail (nx1 != NULL); + g_return_if_fail (ny1 != NULL); + g_return_if_fail (nx2 != NULL); + g_return_if_fail (ny2 != NULL); + + factor_x = shell->scale_x / scale; + factor_y = shell->scale_y / scale; + + x1 = x1 * factor_x - shell->offset_x; + y1 = y1 * factor_y - shell->offset_y; + x2 = x2 * factor_x - shell->offset_x; + y2 = y2 * factor_y - shell->offset_y; + + gimp_display_shell_rotate_bounds (shell, + x1, y1, x2, y2, + nx1, ny1, nx2, ny2); +} + +/* transforms a bounding box from display-space to image-space, uniformly + * scaled by a factor of 'scale'. this is equivalent to, but more accurate + * than, using gimp_display_shell_untransform_bounds(), and multiplying the + * output by 'scale', in particular, in that if 'scale' equals 'shell->scale_x' + * or 'shell->scale_y', there is no loss in accuracy in the corresponding + * dimension due to scaling (although there might be loss of accuracy due to + * rotation or translation.) + */ +void +gimp_display_shell_untransform_bounds_with_scale (GimpDisplayShell *shell, + gdouble scale, + gdouble x1, + gdouble y1, + gdouble x2, + gdouble y2, + gdouble *nx1, + gdouble *ny1, + gdouble *nx2, + gdouble *ny2) +{ + gdouble factor_x; + gdouble factor_y; + + g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell)); + g_return_if_fail (scale > 0.0); + g_return_if_fail (nx1 != NULL); + g_return_if_fail (ny1 != NULL); + g_return_if_fail (nx2 != NULL); + g_return_if_fail (ny2 != NULL); + + factor_x = scale / shell->scale_x; + factor_y = scale / shell->scale_y; + + gimp_display_shell_unrotate_bounds (shell, + x1, y1, x2, y2, + nx1, ny1, nx2, ny2); + + *nx1 = (*nx1 + shell->offset_x) * factor_x; + *ny1 = (*ny1 + shell->offset_y) * factor_y; + *nx2 = (*nx2 + shell->offset_x) * factor_x; + *ny2 = (*ny2 + shell->offset_y) * factor_y; +} + +/** + * gimp_display_shell_untransform_viewport: + * @shell: a #GimpDisplayShell + * @clip: whether to clip the result to the image bounds + * @x: returns image x coordinate of display upper left corner + * @y: returns image y coordinate of display upper left corner + * @width: returns width of display measured in image coordinates + * @height: returns height of display measured in image coordinates + * + * This function calculates the part of the image, in image coordinates, + * that corresponds to the display viewport. + **/ +void +gimp_display_shell_untransform_viewport (GimpDisplayShell *shell, + gboolean clip, + gint *x, + gint *y, + gint *width, + gint *height) +{ + gdouble x1, y1, x2, y2; + + g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell)); + + gimp_display_shell_untransform_bounds (shell, + 0, 0, + shell->disp_width, shell->disp_height, + &x1, &y1, + &x2, &y2); + + x1 = floor (x1); + y1 = floor (y1); + x2 = ceil (x2); + y2 = ceil (y2); + + if (clip) + { + GimpImage *image = gimp_display_get_image (shell->display); + + x1 = MAX (x1, 0); + y1 = MAX (y1, 0); + x2 = MIN (x2, gimp_image_get_width (image)); + y2 = MIN (y2, gimp_image_get_height (image)); + } + + if (x) *x = x1; + if (y) *y = y1; + if (width) *width = x2 - x1; + if (height) *height = y2 - y1; +} + + +/* private functions */ + +/* Same as gimp_display_shell_transform_xy_f(), but doesn't do any rounding + * for the transformed coordinates. + */ +static void +gimp_display_shell_transform_xy_f_noround (GimpDisplayShell *shell, + gdouble x, + gdouble y, + gdouble *nx, + gdouble *ny) +{ + *nx = shell->scale_x * x - shell->offset_x; + *ny = shell->scale_y * y - shell->offset_y; + + if (shell->rotate_transform) + cairo_matrix_transform_point (shell->rotate_transform, nx, ny); +} |