[gtk/wip/otte/transform: 1/37] gtk: Add GtkTransform
- From: Benjamin Otte <otte src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gtk/wip/otte/transform: 1/37] gtk: Add GtkTransform
- Date: Thu, 21 Feb 2019 06:20:55 +0000 (UTC)
commit e338842a8cf3ff8972b1b0164434a9b992ea3ff8
Author: Benjamin Otte <otte redhat com>
Date: Sun Feb 17 12:54:04 2019 +0100
gtk: Add GtkTransform
This is a new object (well, boxed type, but I'm calling it object) for
dealing with transform in a more constructive way than graphene_matrix_t
by keeping track of how the transform was created.
This way, reasoning about the transform becomes easier, and we can create
better ways to print it or transition from one transform to another one.
An example of this is that while a 0 degree and a 360degree rotation are
both the identity matrix, doing a transition between the two would cause
a rotation.
gtk/gtk.h | 1 +
gtk/gtktransform.c | 1093 +++++++++++++++++++++++++++++++++++++++++++++
gtk/gtktransform.h | 104 +++++
gtk/gtktransformprivate.h | 46 ++
gtk/gtktypes.h | 1 +
gtk/meson.build | 2 +
6 files changed, 1247 insertions(+)
---
diff --git a/gtk/gtk.h b/gtk/gtk.h
index 34fff24a3f..62a3bb3d7f 100644
--- a/gtk/gtk.h
+++ b/gtk/gtk.h
@@ -228,6 +228,7 @@
#include <gtk/gtktoolshell.h>
#include <gtk/gtktooltip.h>
#include <gtk/gtktestutils.h>
+#include <gtk/gtktransform.h>
#include <gtk/gtktreednd.h>
#include <gtk/gtktreelistmodel.h>
#include <gtk/gtktreemodel.h>
diff --git a/gtk/gtktransform.c b/gtk/gtktransform.c
new file mode 100644
index 0000000000..f1e0461da6
--- /dev/null
+++ b/gtk/gtktransform.c
@@ -0,0 +1,1093 @@
+/*
+ * Copyright © 2019 Benjamin Otte
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors: Benjamin Otte <otte gnome org>
+ */
+
+
+/**
+ * SECTION:GtkTransform
+ * @Title: GtkTransform
+ * @Short_description: A description for transform operations
+ *
+ * #GtkTransform is an object to describe transform matrices. Unlike
+ * #graphene_matrix_t, #GtkTransform retains the steps in how a transform was
+ * constructed, and allows inspecting them. It is modeled after the way
+ * CSS describes transforms.
+ *
+ * #GtkTransform objects are immutable and cannot be changed after creation.
+ * This means code can safely expose them as properties of objects without
+ * having to worry about others changing them.
+ */
+
+#include "config.h"
+
+#include "gtktransformprivate.h"
+
+typedef struct _GtkTransformClass GtkTransformClass;
+
+#define GTK_IS_MATRIX_TYPE(self,type) (GTK_IS_MATRIX (self) && (self)->transform_class->transform_type ==
(type))
+
+struct _GtkTransform
+{
+ const GtkTransformClass *transform_class;
+
+ volatile int ref_count;
+ GtkTransform *next;
+};
+
+struct _GtkTransformClass
+{
+ GtkTransformType transform_type;
+ gsize struct_size;
+ const char *type_name;
+
+ void (* finalize) (GtkTransform *transform);
+ GskMatrixCategory (* categorize) (GtkTransform *transform);
+ void (* to_matrix) (GtkTransform *transform,
+ graphene_matrix_t *out_matrix);
+ gboolean (* apply_affine) (GtkTransform *transform,
+ float *out_scale_x,
+ float *out_scale_y,
+ float *out_dx,
+ float *out_dy);
+ void (* print) (GtkTransform *transform,
+ GString *string);
+ GtkTransform * (* apply) (GtkTransform *transform,
+ GtkTransform *apply_to);
+ /* both matrices have the same type */
+ gboolean (* equal) (GtkTransform *first_transform,
+ GtkTransform *second_transform);
+};
+
+/**
+ * GtkTransform: (ref-func gtk_transform_ref) (unref-func gtk_transform_unref)
+ *
+ * The `GtkTransform` structure contains only private data.
+ */
+
+G_DEFINE_BOXED_TYPE (GtkTransform, gtk_transform,
+ gtk_transform_ref,
+ gtk_transform_unref)
+
+/*< private >
+ * gtk_transform_new:
+ * @transform_class: class structure for this self
+ * @next: (transfer full) Next matrix to multiply with or %NULL if none
+ *
+ * Returns: (transfer full): the newly created #GtkTransform
+ */
+static gpointer
+gtk_transform_new (const GtkTransformClass *transform_class,
+ GtkTransform *next)
+{
+ GtkTransform *self;
+
+ g_return_val_if_fail (transform_class != NULL, NULL);
+
+ self = g_malloc0 (transform_class->struct_size);
+
+ self->transform_class = transform_class;
+ self->ref_count = 1;
+ self->next = next;
+
+ return self;
+}
+
+/*** IDENTITY ***/
+
+static void
+gtk_identity_transform_finalize (GtkTransform *transform)
+{
+}
+
+static GskMatrixCategory
+gtk_identity_transform_categorize (GtkTransform *transform)
+{
+ return GSK_MATRIX_CATEGORY_IDENTITY;
+}
+
+static void
+gtk_identity_transform_to_matrix (GtkTransform *transform,
+ graphene_matrix_t *out_matrix)
+{
+ graphene_matrix_init_identity (out_matrix);
+}
+
+static gboolean
+gtk_identity_transform_apply_affine (GtkTransform *transform,
+ float *out_scale_x,
+ float *out_scale_y,
+ float *out_dx,
+ float *out_dy)
+{
+ return TRUE;
+}
+
+static void
+gtk_identity_transform_print (GtkTransform *transform,
+ GString *string)
+{
+ g_string_append (string, "identity");
+}
+
+static GtkTransform *
+gtk_identity_transform_apply (GtkTransform *transform,
+ GtkTransform *apply_to)
+{
+ return gtk_transform_identity (apply_to);
+}
+
+static gboolean
+gtk_identity_transform_equal (GtkTransform *first_transform,
+ GtkTransform *second_transform)
+{
+ return TRUE;
+}
+
+static const GtkTransformClass GTK_IDENTITY_TRANSFORM_CLASS =
+{
+ GTK_TRANSFORM_TYPE_IDENTITY,
+ sizeof (GtkTransform),
+ "GtkIdentityMatrix",
+ gtk_identity_transform_finalize,
+ gtk_identity_transform_categorize,
+ gtk_identity_transform_to_matrix,
+ gtk_identity_transform_apply_affine,
+ gtk_identity_transform_print,
+ gtk_identity_transform_apply,
+ gtk_identity_transform_equal,
+};
+
+/**
+ * gtk_transform_identity:
+ * @next: (allow-none): the next transform operation or %NULL
+ *
+ * Adds an identity multiplication into the list of matrix operations.
+ *
+ * This operation is generally useless, but may be useful when interpolating
+ * matrices, because the identity matrix can be interpolated to and from
+ * everything, so an identity matrix can be used as a keyframe between two
+ * different types of matrices.
+ *
+ * Returns: The new matrix
+ **/
+GtkTransform *
+gtk_transform_identity (GtkTransform *next)
+{
+ if (next == NULL)
+ return next;
+
+ return gtk_transform_new (>K_IDENTITY_TRANSFORM_CLASS, next);
+}
+
+/*** MATRIX ***/
+
+typedef struct _GtkMatrixTransform GtkMatrixTransform;
+
+struct _GtkMatrixTransform
+{
+ GtkTransform parent;
+
+ graphene_matrix_t matrix;
+ GskMatrixCategory category;
+};
+
+static void
+gtk_matrix_transform_finalize (GtkTransform *self)
+{
+}
+
+static GskMatrixCategory
+gtk_matrix_transform_categorize (GtkTransform *transform)
+{
+ GtkMatrixTransform *self = (GtkMatrixTransform *) transform;
+
+ return self->category;
+}
+
+static void
+gtk_matrix_transform_to_matrix (GtkTransform *transform,
+ graphene_matrix_t *out_matrix)
+{
+ GtkMatrixTransform *self = (GtkMatrixTransform *) transform;
+
+ graphene_matrix_init_from_matrix (out_matrix, &self->matrix);
+}
+
+static gboolean
+gtk_matrix_transform_apply_affine (GtkTransform *transform,
+ float *out_scale_x,
+ float *out_scale_y,
+ float *out_dx,
+ float *out_dy)
+{
+ GtkMatrixTransform *self = (GtkMatrixTransform *) transform;
+
+ switch (self->category)
+ {
+ case GSK_MATRIX_CATEGORY_UNKNOWN:
+ case GSK_MATRIX_CATEGORY_ANY:
+ case GSK_MATRIX_CATEGORY_INVERTIBLE:
+ default:
+ return FALSE;
+
+ case GSK_MATRIX_CATEGORY_2D_AFFINE:
+ *out_dx += *out_scale_x * graphene_matrix_get_value (&self->matrix, 3, 0);
+ *out_dy += *out_scale_y * graphene_matrix_get_value (&self->matrix, 3, 1);
+ *out_scale_x *= graphene_matrix_get_value (&self->matrix, 0, 0);
+ *out_scale_y *= graphene_matrix_get_value (&self->matrix, 1, 1);
+ return TRUE;
+
+ case GSK_MATRIX_CATEGORY_2D_TRANSLATE:
+ *out_dx += *out_scale_x * graphene_matrix_get_value (&self->matrix, 3, 0);
+ *out_dy += *out_scale_y * graphene_matrix_get_value (&self->matrix, 3, 1);
+ return TRUE;
+
+ case GSK_MATRIX_CATEGORY_IDENTITY:
+ return TRUE;
+ }
+}
+
+static void
+string_append_double (GString *string,
+ double d)
+{
+ char buf[G_ASCII_DTOSTR_BUF_SIZE];
+
+ g_ascii_formatd (buf, G_ASCII_DTOSTR_BUF_SIZE, "%g", d);
+ g_string_append (string, buf);
+}
+
+static void
+gtk_matrix_transform_print (GtkTransform *transform,
+ GString *string)
+{
+ GtkMatrixTransform *self = (GtkMatrixTransform *) transform;
+ guint i;
+ float f[16];
+
+ g_string_append (string, "matrix3d(");
+ graphene_matrix_to_float (&self->matrix, f);
+ for (i = 0; i < 16; i++)
+ {
+ if (i > 0)
+ g_string_append (string, ", ");
+ string_append_double (string, f[i]);
+ }
+ g_string_append (string, ")");
+}
+
+static GtkTransform *
+gtk_matrix_transform_apply (GtkTransform *transform,
+ GtkTransform *apply_to)
+{
+ GtkMatrixTransform *self = (GtkMatrixTransform *) transform;
+
+ return gtk_transform_matrix_with_category (apply_to,
+ &self->matrix,
+ self->category);
+}
+
+static gboolean
+gtk_matrix_transform_equal (GtkTransform *first_transform,
+ GtkTransform *second_transform)
+{
+ GtkMatrixTransform *first = (GtkMatrixTransform *) first_transform;
+ GtkMatrixTransform *second = (GtkMatrixTransform *) second_transform;
+
+ /* Crude, but better than just returning FALSE */
+ return memcmp (&first->matrix, &second->matrix, sizeof (graphene_matrix_t)) == 0;
+}
+
+static const GtkTransformClass GTK_TRANSFORM_TRANSFORM_CLASS =
+{
+ GTK_TRANSFORM_TYPE_TRANSFORM,
+ sizeof (GtkMatrixTransform),
+ "GtkMatrixTransform",
+ gtk_matrix_transform_finalize,
+ gtk_matrix_transform_categorize,
+ gtk_matrix_transform_to_matrix,
+ gtk_matrix_transform_apply_affine,
+ gtk_matrix_transform_print,
+ gtk_matrix_transform_apply,
+ gtk_matrix_transform_equal,
+};
+
+GtkTransform *
+gtk_transform_matrix_with_category (GtkTransform *next,
+ const graphene_matrix_t *matrix,
+ GskMatrixCategory category)
+{
+ GtkMatrixTransform *result = gtk_transform_new (>K_TRANSFORM_TRANSFORM_CLASS, next);
+
+ graphene_matrix_init_from_matrix (&result->matrix, matrix);
+ result->category = category;
+
+ return &result->parent;
+}
+
+/**
+ * gtk_transform_matrix:
+ * @next: (allow-none): the next transform
+ * @matrix: the matrix to multiply @next with
+ *
+ * Multiplies @next with the given @matrix.
+ *
+ * Returns: The new matrix
+ **/
+GtkTransform *
+gtk_transform_matrix (GtkTransform *next,
+ const graphene_matrix_t *matrix)
+{
+ return gtk_transform_matrix_with_category (next, matrix, GSK_MATRIX_CATEGORY_UNKNOWN);
+}
+
+/*** TRANSLATE ***/
+
+typedef struct _GtkTranslateTransform GtkTranslateTransform;
+
+struct _GtkTranslateTransform
+{
+ GtkTransform parent;
+
+ graphene_point3d_t point;
+};
+
+static void
+gtk_translate_transform_finalize (GtkTransform *self)
+{
+}
+
+static GskMatrixCategory
+gtk_translate_transform_categorize (GtkTransform *transform)
+{
+ GtkTranslateTransform *self = (GtkTranslateTransform *) transform;
+
+ if (self->point.z != 0.0)
+ return GSK_MATRIX_CATEGORY_INVERTIBLE;
+
+ return GSK_MATRIX_CATEGORY_2D_TRANSLATE;
+}
+
+static void
+gtk_translate_transform_to_matrix (GtkTransform *transform,
+ graphene_matrix_t *out_matrix)
+{
+ GtkTranslateTransform *self = (GtkTranslateTransform *) transform;
+
+ graphene_matrix_init_translate (out_matrix, &self->point);
+}
+
+static gboolean
+gtk_translate_transform_apply_affine (GtkTransform *transform,
+ float *out_scale_x,
+ float *out_scale_y,
+ float *out_dx,
+ float *out_dy)
+{
+ GtkTranslateTransform *self = (GtkTranslateTransform *) transform;
+
+ if (self->point.z != 0.0)
+ return FALSE;
+
+ *out_dx += *out_scale_x * self->point.x;
+ *out_dy += *out_scale_y * self->point.y;
+
+ return TRUE;
+}
+
+static GtkTransform *
+gtk_translate_transform_apply (GtkTransform *transform,
+ GtkTransform *apply_to)
+{
+ GtkTranslateTransform *self = (GtkTranslateTransform *) transform;
+
+ return gtk_transform_translate_3d (apply_to, &self->point);
+}
+
+static gboolean
+gtk_translate_transform_equal (GtkTransform *first_transform,
+ GtkTransform *second_transform)
+{
+ GtkTranslateTransform *first = (GtkTranslateTransform *) first_transform;
+ GtkTranslateTransform *second = (GtkTranslateTransform *) second_transform;
+
+ return graphene_point3d_equal (&first->point, &second->point);
+}
+
+static void
+gtk_translate_transform_print (GtkTransform *transform,
+ GString *string)
+{
+ GtkTranslateTransform *self = (GtkTranslateTransform *) transform;
+
+ if (self->point.z == 0)
+ g_string_append (string, "translate(");
+ else
+ g_string_append (string, "translate3d(");
+
+ string_append_double (string, self->point.x);
+ g_string_append (string, ", ");
+ string_append_double (string, self->point.y);
+ if (self->point.z != 0)
+ {
+ g_string_append (string, ", ");
+ string_append_double (string, self->point.y);
+ }
+ g_string_append (string, ")");
+}
+
+static const GtkTransformClass GTK_TRANSLATE_TRANSFORM_CLASS =
+{
+ GTK_TRANSFORM_TYPE_TRANSLATE,
+ sizeof (GtkTranslateTransform),
+ "GtkTranslateTransform",
+ gtk_translate_transform_finalize,
+ gtk_translate_transform_categorize,
+ gtk_translate_transform_to_matrix,
+ gtk_translate_transform_apply_affine,
+ gtk_translate_transform_print,
+ gtk_translate_transform_apply,
+ gtk_translate_transform_equal,
+};
+
+/**
+ * gtk_transform_translate:
+ * @next: (allow-none): the next transform
+ * @point: the point to translate the matrix by
+ *
+ * Translates @next in 2dimensional space by @point.
+ *
+ * Returns: The new matrix
+ **/
+GtkTransform *
+gtk_transform_translate (GtkTransform *next,
+ const graphene_point_t *point)
+{
+ graphene_point3d_t point3d;
+
+ graphene_point3d_init (&point3d, point->x, point->y, 0);
+
+ return gtk_transform_translate_3d (next, &point3d);
+}
+
+/**
+ * gtk_transform_translate_3d:
+ * @next: (allow-none): the next transform
+ * @point: the point to translate the matrix by
+ *
+ * Translates @next by @point.
+ *
+ * Returns: The new matrix
+ **/
+GtkTransform *
+gtk_transform_translate_3d (GtkTransform *next,
+ const graphene_point3d_t *point)
+{
+ GtkTranslateTransform *result = gtk_transform_new (>K_TRANSLATE_TRANSFORM_CLASS, next);
+
+ graphene_point3d_init_from_point (&result->point, point);
+
+ return &result->parent;
+}
+
+/*** ROTATE ***/
+
+typedef struct _GtkRotateTransform GtkRotateTransform;
+
+struct _GtkRotateTransform
+{
+ GtkTransform parent;
+
+ float angle;
+ graphene_vec3_t axis;
+};
+
+static void
+gtk_rotate_transform_finalize (GtkTransform *self)
+{
+}
+
+static GskMatrixCategory
+gtk_rotate_transform_categorize (GtkTransform *transform)
+{
+ return GSK_MATRIX_CATEGORY_INVERTIBLE;
+}
+
+static void
+gtk_rotate_transform_to_matrix (GtkTransform *transform,
+ graphene_matrix_t *out_matrix)
+{
+ GtkRotateTransform *self = (GtkRotateTransform *) transform;
+
+ graphene_matrix_init_rotate (out_matrix, self->angle, &self->axis);
+}
+
+static gboolean
+gtk_rotate_transform_apply_affine (GtkTransform *transform,
+ float *out_scale_x,
+ float *out_scale_y,
+ float *out_dx,
+ float *out_dy)
+{
+ return FALSE;
+}
+
+static GtkTransform *
+gtk_rotate_transform_apply (GtkTransform *transform,
+ GtkTransform *apply_to)
+{
+ GtkRotateTransform *self = (GtkRotateTransform *) transform;
+
+ return gtk_transform_rotate_3d (apply_to, self->angle, &self->axis);
+}
+
+static gboolean
+gtk_rotate_transform_equal (GtkTransform *first_transform,
+ GtkTransform *second_transform)
+{
+ GtkRotateTransform *first = (GtkRotateTransform *) first_transform;
+ GtkRotateTransform *second = (GtkRotateTransform *) second_transform;
+
+ return first->angle == second->angle
+ && graphene_vec3_equal (&first->axis, &second->axis);
+}
+
+static void
+gtk_rotate_transform_print (GtkTransform *transform,
+ GString *string)
+{
+ GtkRotateTransform *self = (GtkRotateTransform *) transform;
+ graphene_vec3_t default_axis;
+
+ graphene_vec3_init_from_vec3 (&default_axis, graphene_vec3_z_axis ());
+ if (graphene_vec3_equal (&default_axis, &self->axis))
+ {
+ g_string_append (string, "rotate(");
+ string_append_double (string, self->angle);
+ g_string_append (string, ")");
+ }
+ else
+ {
+ float f[3];
+ guint i;
+
+ g_string_append (string, "rotate3d(");
+ graphene_vec3_to_float (&self->axis, f);
+ for (i = 0; i < 3; i++)
+ {
+ string_append_double (string, f[i]);
+ g_string_append (string, ", ");
+ }
+ string_append_double (string, self->angle);
+ g_string_append (string, ")");
+ }
+}
+
+static const GtkTransformClass GTK_ROTATE_TRANSFORM_CLASS =
+{
+ GTK_TRANSFORM_TYPE_ROTATE,
+ sizeof (GtkRotateTransform),
+ "GtkRotateTransform",
+ gtk_rotate_transform_finalize,
+ gtk_rotate_transform_categorize,
+ gtk_rotate_transform_to_matrix,
+ gtk_rotate_transform_apply_affine,
+ gtk_rotate_transform_print,
+ gtk_rotate_transform_apply,
+ gtk_rotate_transform_equal,
+};
+
+/**
+ * gtk_transform_rotate:
+ * @next: (allow-none): the next transform
+ * @angle: the rotation angle, in degrees (clockwise)
+ *
+ * Rotates @next @angle degrees in 2D - or in 3Dspeak, around the z axis.
+ *
+ * Returns: The new matrix
+ **/
+GtkTransform *
+gtk_transform_rotate (GtkTransform *next,
+ float angle)
+{
+ return gtk_transform_rotate_3d (next, angle, graphene_vec3_z_axis ());
+}
+
+/**
+ * gtk_transform_rotate_3d:
+ * @next: (allow-none): the next transform
+ * @angle: the rotation angle, in degrees (clockwise)
+ * @axis: The rotation axis
+ *
+ * Rotates @next @angle degrees around @axis.
+ *
+ * For a rotation in 2D space, use gtk_transform_rotate().
+ *
+ * Returns: The new matrix
+ **/
+GtkTransform *
+gtk_transform_rotate_3d (GtkTransform *next,
+ float angle,
+ const graphene_vec3_t *axis)
+{
+ GtkRotateTransform *result = gtk_transform_new (>K_ROTATE_TRANSFORM_CLASS, next);
+
+ result->angle = angle;
+ graphene_vec3_init_from_vec3 (&result->axis, axis);
+
+ return &result->parent;
+}
+
+/*** SCALE ***/
+
+typedef struct _GtkScaleTransform GtkScaleTransform;
+
+struct _GtkScaleTransform
+{
+ GtkTransform parent;
+
+ float factor_x;
+ float factor_y;
+ float factor_z;
+};
+
+static void
+gtk_scale_transform_finalize (GtkTransform *self)
+{
+}
+
+static GskMatrixCategory
+gtk_scale_transform_categorize (GtkTransform *transform)
+{
+ GtkScaleTransform *self = (GtkScaleTransform *) transform;
+
+ if (self->factor_z != 1.0)
+ return GSK_MATRIX_CATEGORY_INVERTIBLE;
+
+ return GSK_MATRIX_CATEGORY_2D_AFFINE;
+}
+
+static void
+gtk_scale_transform_to_matrix (GtkTransform *transform,
+ graphene_matrix_t *out_matrix)
+{
+ GtkScaleTransform *self = (GtkScaleTransform *) transform;
+
+ graphene_matrix_init_scale (out_matrix, self->factor_x, self->factor_y, self->factor_z);
+}
+
+static gboolean
+gtk_scale_transform_apply_affine (GtkTransform *transform,
+ float *out_scale_x,
+ float *out_scale_y,
+ float *out_dx,
+ float *out_dy)
+{
+ GtkScaleTransform *self = (GtkScaleTransform *) transform;
+
+ if (self->factor_z != 1.0)
+ return FALSE;
+
+ *out_scale_x *= self->factor_x;
+ *out_scale_y *= self->factor_y;
+
+ return TRUE;
+}
+
+static GtkTransform *
+gtk_scale_transform_apply (GtkTransform *transform,
+ GtkTransform *apply_to)
+{
+ GtkScaleTransform *self = (GtkScaleTransform *) transform;
+
+ return gtk_transform_scale_3d (apply_to, self->factor_x, self->factor_y, self->factor_z);
+}
+
+static gboolean
+gtk_scale_transform_equal (GtkTransform *first_transform,
+ GtkTransform *second_transform)
+{
+ GtkScaleTransform *first = (GtkScaleTransform *) first_transform;
+ GtkScaleTransform *second = (GtkScaleTransform *) second_transform;
+
+ return first->factor_x == second->factor_x
+ && first->factor_y == second->factor_y
+ && first->factor_z == second->factor_z;
+}
+
+static void
+gtk_scale_transform_print (GtkTransform *transform,
+ GString *string)
+{
+ GtkScaleTransform *self = (GtkScaleTransform *) transform;
+
+ if (self->factor_z == 1.0)
+ {
+ g_string_append (string, "scale(");
+ string_append_double (string, self->factor_x);
+ if (self->factor_x != self->factor_y)
+ {
+ g_string_append (string, ", ");
+ string_append_double (string, self->factor_y);
+ }
+ g_string_append (string, ")");
+ }
+ else
+ {
+ g_string_append (string, "scale3d(");
+ string_append_double (string, self->factor_x);
+ g_string_append (string, ", ");
+ string_append_double (string, self->factor_y);
+ g_string_append (string, ", ");
+ string_append_double (string, self->factor_z);
+ g_string_append (string, ")");
+ }
+}
+
+static const GtkTransformClass GTK_SCALE_TRANSFORM_CLASS =
+{
+ GTK_TRANSFORM_TYPE_SCALE,
+ sizeof (GtkScaleTransform),
+ "GtkScaleTransform",
+ gtk_scale_transform_finalize,
+ gtk_scale_transform_categorize,
+ gtk_scale_transform_to_matrix,
+ gtk_scale_transform_apply_affine,
+ gtk_scale_transform_print,
+ gtk_scale_transform_apply,
+ gtk_scale_transform_equal,
+};
+
+/**
+ * gtk_transform_scale:
+ * @next: (allow-none): the next transform
+ * @factor_x: scaling factor on the X axis
+ * @factor_y: scaling factor on the Y axis
+ *
+ * Scales @next in 2-dimensional space by the given factors.
+ * Use gtk_transform_scale_3d() to scale in all 3 dimensions.
+ *
+ * Returns: The new matrix
+ **/
+GtkTransform *
+gtk_transform_scale (GtkTransform *next,
+ float factor_x,
+ float factor_y)
+{
+ return gtk_transform_scale_3d (next, factor_x, factor_y, 1.0);
+}
+
+/**
+ * gtk_transform_scale_3d:
+ * @next: (allow-none): the next transform
+ * @factor_x: scaling factor on the X axis
+ * @factor_y: scaling factor on the Y axis
+ * @factor_z: scaling factor on the Z axis
+ *
+ * Scales @next by the given factors.
+ *
+ * Returns: The new matrix
+ **/
+GtkTransform *
+gtk_transform_scale_3d (GtkTransform *next,
+ float factor_x,
+ float factor_y,
+ float factor_z)
+{
+ GtkScaleTransform *result = gtk_transform_new (>K_SCALE_TRANSFORM_CLASS, next);
+
+ result->factor_x = factor_x;
+ result->factor_y = factor_y;
+ result->factor_z = factor_z;
+
+ return &result->parent;
+}
+
+/*** PUBLIC API ***/
+
+static void
+gtk_transform_finalize (GtkTransform *self)
+{
+ self->transform_class->finalize (self);
+
+ gtk_transform_unref (self->next);
+
+ g_free (self);
+}
+
+/**
+ * gtk_transform_ref:
+ * @self: (allow-none): a #GtkTransform
+ *
+ * Acquires a reference on the given #GtkTransform.
+ *
+ * Returns: (transfer none): the #GtkTransform with an additional reference
+ */
+GtkTransform *
+gtk_transform_ref (GtkTransform *self)
+{
+ if (self == NULL)
+ return NULL;
+
+ g_atomic_int_inc (&self->ref_count);
+
+ return self;
+}
+
+/**
+ * gtk_transform_unref:
+ * @self: (allow-none): a #GtkTransform
+ *
+ * Releases a reference on the given #GtkTransform.
+ *
+ * If the reference was the last, the resources associated to the @self are
+ * freed.
+ */
+void
+gtk_transform_unref (GtkTransform *self)
+{
+ if (self == NULL)
+ return;
+
+ if (g_atomic_int_dec_and_test (&self->ref_count))
+ gtk_transform_finalize (self);
+}
+
+/**
+ * gtk_transform_print:
+ * @self: (allow-none): a #GtkTransform
+ * @string: The string to print into
+ *
+ * Converts @self into a string representation suitable for printing that
+ * can later be parsed with gtk_transform_parse().
+ **/
+void
+gtk_transform_print (GtkTransform *self,
+ GString *string)
+{
+ g_return_if_fail (string != NULL);
+
+ if (self == NULL)
+ {
+ g_string_append (string, "none");
+ return;
+ }
+
+ if (self->next != NULL)
+ {
+ gtk_transform_print (self->next, string);
+ g_string_append (string, " ");
+ }
+
+ self->transform_class->print (self, string);
+}
+
+/**
+ * gtk_transform_to_string:
+ * @self: (allow-none): a #GtkTransform
+ *
+ * Converts a matrix into a string that is suitable for
+ * printing and can later be parsed with gtk_transform_parse().
+ *
+ * This is a wrapper around gtk_transform_print(), see that function
+ * for details.
+ *
+ * Returns: A new string for @self
+ **/
+char *
+gtk_transform_to_string (GtkTransform *self)
+{
+ GString *string;
+
+ string = g_string_new ("");
+
+ gtk_transform_print (self, string);
+
+ return g_string_free (string, FALSE);
+}
+
+/**
+ * gtk_transform_get_transform_type:
+ * @self: (allow-none): a #GtkTransform
+ *
+ * Returns the type of the @self.
+ *
+ * Returns: the type of the #GtkTransform
+ */
+GtkTransformType
+gtk_transform_get_transform_type (GtkTransform *self)
+{
+ if (self == NULL)
+ return GTK_TRANSFORM_TYPE_IDENTITY;
+
+ return self->transform_class->transform_type;
+}
+
+/**
+ * gtk_transform_get_next:
+ * @self: (allow-none): a #GtkTransform
+ *
+ * Gets the rest of the matrix in the chain of operations.
+ *
+ * Returns: (transfer none) (nullable): The next transform or
+ * %NULL if this was the last operation.
+ **/
+GtkTransform *
+gtk_transform_get_next (GtkTransform *self)
+{
+ if (self == NULL)
+ return NULL;
+
+ return self->next;
+}
+
+/**
+ * gtk_transform_to_matrix:
+ * @self: (allow-none): a #GtkTransform
+ * @out_matrix: (out) (caller-allocates): The matrix to set
+ *
+ * Computes the actual value of @self and stores it in @out_matrix.
+ * The previous value of @out_matrix will be ignored.
+ **/
+void
+gtk_transform_to_matrix (GtkTransform *self,
+ graphene_matrix_t *out_matrix)
+{
+ graphene_matrix_t m;
+
+ if (self == NULL)
+ {
+ graphene_matrix_init_identity (out_matrix);
+ return;
+ }
+
+ gtk_transform_to_matrix (self->next, out_matrix);
+ self->transform_class->to_matrix (self, &m);
+ graphene_matrix_multiply (&m, out_matrix, out_matrix);
+}
+
+gboolean
+gtk_transform_to_affine (GtkTransform *self,
+ float *out_scale_x,
+ float *out_scale_y,
+ float *out_dx,
+ float *out_dy)
+{
+ if (self == NULL)
+ {
+ *out_scale_x = 1.0f;
+ *out_scale_y = 1.0f;
+ *out_dx = 0.0f;
+ *out_dy = 0.0f;
+ return TRUE;
+ }
+
+ if (!gtk_transform_to_affine (self->next,
+ out_scale_x, out_scale_y,
+ out_dx, out_dy))
+ return FALSE;
+
+ return self->transform_class->apply_affine (self,
+ out_scale_x, out_scale_y,
+ out_dx, out_dy);
+}
+
+/**
+ * gtk_transform_transform:
+ * @next: (allow-none) (transfer full): Transform to apply @other to
+ * @other: (allow-none): Transform to apply
+ *
+ * Applies all the operations from @other to @next.
+ *
+ * Returns: The new matrix
+ **/
+GtkTransform *
+gtk_transform_transform (GtkTransform *next,
+ GtkTransform *other)
+{
+ if (other == NULL)
+ return next;
+
+ next = gtk_transform_transform (next, other->next);
+ return other->transform_class->apply (other, next);
+}
+
+/**
+ * gtk_transform_equal:
+ * @first: the first matrix
+ * @second: the second matrix
+ *
+ * Checks two matrices for equality. Note that matrices need to be literally
+ * identical in their operations, it is not enough that they return the
+ * same result in gtk_transform_to_matrix().
+ *
+ * Returns: %TRUE if the two matrices can be proven to be equal
+ **/
+gboolean
+gtk_transform_equal (GtkTransform *first,
+ GtkTransform *second)
+{
+ if (first == second)
+ return TRUE;
+
+ if (first == NULL || second == NULL)
+ return FALSE;
+
+ if (!gtk_transform_equal (first->next, second->next))
+ return FALSE;
+
+ if (first->transform_class != second->transform_class)
+ return FALSE;
+
+ return first->transform_class->equal (first, second);
+}
+
+/*<private>
+ * gtk_transform_categorize:
+ * @self: (allow-none): A matrix
+ *
+ *
+ *
+ * Returns: The category this matrix belongs to
+ **/
+GskMatrixCategory
+gtk_transform_categorize (GtkTransform *self)
+{
+ if (self == NULL)
+ return GSK_MATRIX_CATEGORY_IDENTITY;
+
+ return MIN (gtk_transform_categorize (self->next),
+ self->transform_class->categorize (self));
+}
+
+/**
+ * gtk_transform_get_identity:
+ *
+ * Returns the identity matrix. In C code, this equivalent to
+ * using %NULL.
+ *
+ * See also gtk_transform_identity() for inserting identity matrix operations
+ * when constructing matrices.
+ *
+ * Returns: The identity matrix
+ **/
+GtkTransform *
+gtk_transform_get_identity (void)
+{
+ return NULL;
+}
diff --git a/gtk/gtktransform.h b/gtk/gtktransform.h
new file mode 100644
index 0000000000..80e22106b1
--- /dev/null
+++ b/gtk/gtktransform.h
@@ -0,0 +1,104 @@
+/*
+ * Copyright © 2019 Benjamin Otte
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors: Benjamin Otte <otte gnome org>
+ */
+
+
+#ifndef __GTK_TRANSFORM_H__
+#define __GTK_TRANSFORM_H__
+
+#if !defined (__GTK_H_INSIDE__) && !defined (GTK_COMPILATION)
+#error "Only <gtk/gtk.h> can be included directly."
+#endif
+
+#include <graphene.h>
+#include <gtk/gtktypes.h>
+
+G_BEGIN_DECLS
+
+#define GTK_TYPE_MATRIX (gtk_transform_get_type ())
+
+typedef enum
+{
+ GTK_TRANSFORM_TYPE_IDENTITY,
+ GTK_TRANSFORM_TYPE_TRANSFORM,
+ GTK_TRANSFORM_TYPE_TRANSLATE,
+ GTK_TRANSFORM_TYPE_ROTATE,
+ GTK_TRANSFORM_TYPE_SCALE
+} GtkTransformType;
+
+GDK_AVAILABLE_IN_ALL
+GType gtk_transform_get_type (void) G_GNUC_CONST;
+
+GDK_AVAILABLE_IN_ALL
+GtkTransform * gtk_transform_ref (GtkTransform *self);
+GDK_AVAILABLE_IN_ALL
+void gtk_transform_unref (GtkTransform *self);
+
+GDK_AVAILABLE_IN_ALL
+void gtk_transform_print (GtkTransform *self,
+ GString *string);
+GDK_AVAILABLE_IN_ALL
+char * gtk_transform_to_string (GtkTransform *self);
+GDK_AVAILABLE_IN_ALL
+void gtk_transform_to_matrix (GtkTransform *self,
+ graphene_matrix_t *out_matrix);
+GDK_AVAILABLE_IN_ALL
+gboolean gtk_transform_equal (GtkTransform *first,
+ GtkTransform *second)
G_GNUC_PURE;
+
+GDK_AVAILABLE_IN_ALL
+GtkTransform * gtk_transform_get_identity (void) G_GNUC_PURE;
+GDK_AVAILABLE_IN_ALL
+GtkTransform * gtk_transform_identity (GtkTransform *next);
+GDK_AVAILABLE_IN_ALL
+GtkTransform * gtk_transform_transform (GtkTransform *next,
+ GtkTransform *other);
+GDK_AVAILABLE_IN_ALL
+GtkTransform * gtk_transform_matrix (GtkTransform *next,
+ const graphene_matrix_t *matrix);
+GDK_AVAILABLE_IN_ALL
+GtkTransform * gtk_transform_translate (GtkTransform *next,
+ const graphene_point_t *point);
+GDK_AVAILABLE_IN_ALL
+GtkTransform * gtk_transform_translate_3d (GtkTransform *next,
+ const graphene_point3d_t *point);
+GDK_AVAILABLE_IN_ALL
+GtkTransform * gtk_transform_rotate (GtkTransform *next,
+ float angle);
+GDK_AVAILABLE_IN_ALL
+GtkTransform * gtk_transform_rotate_3d (GtkTransform *next,
+ float angle,
+ const graphene_vec3_t *axis);
+GDK_AVAILABLE_IN_ALL
+GtkTransform * gtk_transform_scale (GtkTransform *next,
+ float factor_x,
+ float factor_y);
+GDK_AVAILABLE_IN_ALL
+GtkTransform * gtk_transform_scale_3d (GtkTransform *next,
+ float factor_x,
+ float factor_y,
+ float factor_z);
+
+GDK_AVAILABLE_IN_ALL
+GtkTransformType gtk_transform_get_transform_type (GtkTransform *self)
G_GNUC_PURE;
+GDK_AVAILABLE_IN_ALL
+GtkTransform * gtk_transform_get_next (GtkTransform *self)
G_GNUC_PURE;
+
+G_END_DECLS
+
+#endif /* __GTK_TRANSFORM_H__ */
diff --git a/gtk/gtktransformprivate.h b/gtk/gtktransformprivate.h
new file mode 100644
index 0000000000..5aef0b001d
--- /dev/null
+++ b/gtk/gtktransformprivate.h
@@ -0,0 +1,46 @@
+/*
+ * Copyright © 2019 Benjamin Otte
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors: Benjamin Otte <otte gnome org>
+ */
+
+
+#ifndef __GTK_TRANSFORM_PRIVATE_H__
+#define __GTK_TRANSFORM_PRIVATE_H__
+
+#include "gtktransform.h"
+
+#include <gsk/gsk.h>
+#include "gsk/gskrendernodeprivate.h"
+
+G_BEGIN_DECLS
+
+GskMatrixCategory gtk_transform_categorize (GtkTransform *self);
+
+gboolean gtk_transform_to_affine (GtkTransform *self,
+ float *scale_x,
+ float *scale_y,
+ float *dx,
+ float *dy)
G_GNUC_WARN_UNUSED_RESULT;
+
+GtkTransform * gtk_transform_matrix_with_category (GtkTransform *next,
+ const graphene_matrix_t*matrix,
+ GskMatrixCategory category);
+
+G_END_DECLS
+
+#endif /* __GTK_TRANSFORM_PRIVATE_H__ */
+
diff --git a/gtk/gtktypes.h b/gtk/gtktypes.h
index 5d1218f189..9876bed3a5 100644
--- a/gtk/gtktypes.h
+++ b/gtk/gtktypes.h
@@ -45,6 +45,7 @@ typedef struct _GtkSettings GtkSettings;
typedef GdkSnapshot GtkSnapshot;
typedef struct _GtkStyleContext GtkStyleContext;
typedef struct _GtkTooltip GtkTooltip;
+typedef struct _GtkTransform GtkTransform;
typedef struct _GtkWidget GtkWidget;
typedef struct _GtkWidgetPath GtkWidgetPath;
typedef struct _GtkWindow GtkWindow;
diff --git a/gtk/meson.build b/gtk/meson.build
index 2e6c813b4a..7b2aeab405 100644
--- a/gtk/meson.build
+++ b/gtk/meson.build
@@ -376,6 +376,7 @@ gtk_public_sources = files([
'gtktoolshell.c',
'gtktooltip.c',
'gtktooltipwindow.c',
+ 'gtktransform.c',
'gtktreednd.c',
'gtktreelistmodel.c',
'gtktreemenu.c',
@@ -606,6 +607,7 @@ gtk_public_headers = files([
'gtktoolitem.h',
'gtktoolshell.h',
'gtktooltip.h',
+ 'gtktransform.h',
'gtktreednd.h',
'gtktreelistmodel.h',
'gtktreemodel.h',
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