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Learning_GTK4_tree/gsk/gskenums.h

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/* GSK - The GTK Scene Kit
* Copyright 2016 Endless
*
* 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 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/>.
*/
#pragma once
#if !defined (__GSK_H_INSIDE__) && !defined (GTK_COMPILATION)
#error "Only <gsk/gsk.h> can be included directly."
#endif
/**
* GskRenderNodeType:
* @GSK_NOT_A_RENDER_NODE: Error type. No node will ever have this type.
* @GSK_CONTAINER_NODE: A node containing a stack of children
* @GSK_CAIRO_NODE: A node drawing a `cairo_surface_t`
* @GSK_COLOR_NODE: A node drawing a single color rectangle
* @GSK_LINEAR_GRADIENT_NODE: A node drawing a linear gradient
* @GSK_REPEATING_LINEAR_GRADIENT_NODE: A node drawing a repeating linear gradient
* @GSK_RADIAL_GRADIENT_NODE: A node drawing a radial gradient
* @GSK_REPEATING_RADIAL_GRADIENT_NODE: A node drawing a repeating radial gradient
* @GSK_CONIC_GRADIENT_NODE: A node drawing a conic gradient
* @GSK_BORDER_NODE: A node stroking a border around an area
* @GSK_TEXTURE_NODE: A node drawing a `GdkTexture`
* @GSK_INSET_SHADOW_NODE: A node drawing an inset shadow
* @GSK_OUTSET_SHADOW_NODE: A node drawing an outset shadow
* @GSK_TRANSFORM_NODE: A node that renders its child after applying a matrix transform
* @GSK_OPACITY_NODE: A node that changes the opacity of its child
* @GSK_COLOR_MATRIX_NODE: A node that applies a color matrix to every pixel
* @GSK_REPEAT_NODE: A node that repeats the child's contents
* @GSK_CLIP_NODE: A node that clips its child to a rectangular area
* @GSK_ROUNDED_CLIP_NODE: A node that clips its child to a rounded rectangle
* @GSK_SHADOW_NODE: A node that draws a shadow below its child
* @GSK_BLEND_NODE: A node that blends two children together
* @GSK_CROSS_FADE_NODE: A node that cross-fades between two children
* @GSK_TEXT_NODE: A node containing a glyph string
* @GSK_BLUR_NODE: A node that applies a blur
* @GSK_DEBUG_NODE: Debug information that does not affect the rendering
* @GSK_GL_SHADER_NODE: A node that uses OpenGL fragment shaders to render
* @GSK_TEXTURE_SCALE_NODE: A node drawing a `GdkTexture` scaled and filtered. Since: 4.10
* @GSK_MASK_NODE: A node that masks one child with another. Since: 4.10
* @GSK_FILL_NODE: A node that fills a path. Since: 4.14
* @GSK_STROKE_NODE: A node that strokes a path. Since: 4.14
* @GSK_SUBSURFACE_NODE: A node possibly redirects part of the scene graph to a subsurface. Since: 4.14
*
* The type of a node determines what the node is rendering.
*/
typedef enum {
GSK_NOT_A_RENDER_NODE = 0,
GSK_CONTAINER_NODE,
GSK_CAIRO_NODE,
GSK_COLOR_NODE,
GSK_LINEAR_GRADIENT_NODE,
GSK_REPEATING_LINEAR_GRADIENT_NODE,
GSK_RADIAL_GRADIENT_NODE,
GSK_REPEATING_RADIAL_GRADIENT_NODE,
GSK_CONIC_GRADIENT_NODE,
GSK_BORDER_NODE,
GSK_TEXTURE_NODE,
GSK_INSET_SHADOW_NODE,
GSK_OUTSET_SHADOW_NODE,
GSK_TRANSFORM_NODE,
GSK_OPACITY_NODE,
GSK_COLOR_MATRIX_NODE,
GSK_REPEAT_NODE,
GSK_CLIP_NODE,
GSK_ROUNDED_CLIP_NODE,
GSK_SHADOW_NODE,
GSK_BLEND_NODE,
GSK_CROSS_FADE_NODE,
GSK_TEXT_NODE,
GSK_BLUR_NODE,
GSK_DEBUG_NODE,
GSK_GL_SHADER_NODE,
GSK_TEXTURE_SCALE_NODE,
GSK_MASK_NODE,
GSK_FILL_NODE,
GSK_STROKE_NODE,
GSK_SUBSURFACE_NODE,
} GskRenderNodeType;
/**
* GskScalingFilter:
* @GSK_SCALING_FILTER_LINEAR: linear interpolation filter
* @GSK_SCALING_FILTER_NEAREST: nearest neighbor interpolation filter
* @GSK_SCALING_FILTER_TRILINEAR: linear interpolation along each axis,
* plus mipmap generation, with linear interpolation along the mipmap
* levels
*
* The filters used when scaling texture data.
*
* The actual implementation of each filter is deferred to the
* rendering pipeline.
*/
typedef enum {
GSK_SCALING_FILTER_LINEAR,
GSK_SCALING_FILTER_NEAREST,
GSK_SCALING_FILTER_TRILINEAR
} GskScalingFilter;
/**
* GskBlendMode:
* @GSK_BLEND_MODE_DEFAULT: The default blend mode, which specifies no blending
* @GSK_BLEND_MODE_MULTIPLY: The source color is multiplied by the destination
* and replaces the destination
* @GSK_BLEND_MODE_SCREEN: Multiplies the complements of the destination and source
* color values, then complements the result.
* @GSK_BLEND_MODE_OVERLAY: Multiplies or screens the colors, depending on the
* destination color value. This is the inverse of hard-list
* @GSK_BLEND_MODE_DARKEN: Selects the darker of the destination and source colors
* @GSK_BLEND_MODE_LIGHTEN: Selects the lighter of the destination and source colors
* @GSK_BLEND_MODE_COLOR_DODGE: Brightens the destination color to reflect the source color
* @GSK_BLEND_MODE_COLOR_BURN: Darkens the destination color to reflect the source color
* @GSK_BLEND_MODE_HARD_LIGHT: Multiplies or screens the colors, depending on the source color value
* @GSK_BLEND_MODE_SOFT_LIGHT: Darkens or lightens the colors, depending on the source color value
* @GSK_BLEND_MODE_DIFFERENCE: Subtracts the darker of the two constituent colors from the lighter color
* @GSK_BLEND_MODE_EXCLUSION: Produces an effect similar to that of the difference mode but lower in contrast
* @GSK_BLEND_MODE_COLOR: Creates a color with the hue and saturation of the source color and the luminosity of the destination color
* @GSK_BLEND_MODE_HUE: Creates a color with the hue of the source color and the saturation and luminosity of the destination color
* @GSK_BLEND_MODE_SATURATION: Creates a color with the saturation of the source color and the hue and luminosity of the destination color
* @GSK_BLEND_MODE_LUMINOSITY: Creates a color with the luminosity of the source color and the hue and saturation of the destination color
*
* The blend modes available for render nodes.
*
* The implementation of each blend mode is deferred to the
* rendering pipeline.
*
* See <https://www.w3.org/TR/compositing-1/#blending> for more information
* on blending and blend modes.
*/
typedef enum {
GSK_BLEND_MODE_DEFAULT = 0,
GSK_BLEND_MODE_MULTIPLY,
GSK_BLEND_MODE_SCREEN,
GSK_BLEND_MODE_OVERLAY,
GSK_BLEND_MODE_DARKEN,
GSK_BLEND_MODE_LIGHTEN,
GSK_BLEND_MODE_COLOR_DODGE,
GSK_BLEND_MODE_COLOR_BURN,
GSK_BLEND_MODE_HARD_LIGHT,
GSK_BLEND_MODE_SOFT_LIGHT,
GSK_BLEND_MODE_DIFFERENCE,
GSK_BLEND_MODE_EXCLUSION,
GSK_BLEND_MODE_COLOR,
GSK_BLEND_MODE_HUE,
GSK_BLEND_MODE_SATURATION,
GSK_BLEND_MODE_LUMINOSITY
} GskBlendMode;
/**
* GskCorner:
* @GSK_CORNER_TOP_LEFT: The top left corner
* @GSK_CORNER_TOP_RIGHT: The top right corner
* @GSK_CORNER_BOTTOM_RIGHT: The bottom right corner
* @GSK_CORNER_BOTTOM_LEFT: The bottom left corner
*
* The corner indices used by `GskRoundedRect`.
*/
typedef enum {
GSK_CORNER_TOP_LEFT,
GSK_CORNER_TOP_RIGHT,
GSK_CORNER_BOTTOM_RIGHT,
GSK_CORNER_BOTTOM_LEFT
} GskCorner;
/**
* GskFillRule:
* @GSK_FILL_RULE_WINDING: If the path crosses the ray from
* left-to-right, counts +1. If the path crosses the ray
* from right to left, counts -1. (Left and right are determined
* from the perspective of looking along the ray from the starting
* point.) If the total count is non-zero, the point will be filled.
* @GSK_FILL_RULE_EVEN_ODD: Counts the total number of
* intersections, without regard to the orientation of the contour. If
* the total number of intersections is odd, the point will be
* filled.
*
* `GskFillRule` is used to select how paths are filled.
*
* Whether or not a point is included in the fill is determined by taking
* a ray from that point to infinity and looking at intersections with the
* path. The ray can be in any direction, as long as it doesn't pass through
* the end point of a segment or have a tricky intersection such as
* intersecting tangent to the path.
*
* (Note that filling is not actually implemented in this way. This
* is just a description of the rule that is applied.)
*
* New entries may be added in future versions.
*
* Since: 4.14
*/
typedef enum {
GSK_FILL_RULE_WINDING,
GSK_FILL_RULE_EVEN_ODD
} GskFillRule;
/**
* GskLineCap:
* @GSK_LINE_CAP_BUTT: Start and stop the line exactly at the start
* and end point
* @GSK_LINE_CAP_ROUND: Use a round ending, the center of the circle
* is the start or end point
* @GSK_LINE_CAP_SQUARE: use squared ending, the center of the square
* is the start or end point
*
* Specifies how to render the start and end points of contours or
* dashes when stroking.
*
* The default line cap style is `GSK_LINE_CAP_BUTT`.
*
* New entries may be added in future versions.
*
* <figure>
* <picture>
* <source srcset="caps-dark.png" media="(prefers-color-scheme: dark)">
* <img alt="Line Cap Styles" src="caps-light.png">
* </picture>
* <figcaption>GSK_LINE_CAP_BUTT, GSK_LINE_CAP_ROUND, GSK_LINE_CAP_SQUARE</figcaption>
* </figure>
*
* Since: 4.14
*/
typedef enum {
GSK_LINE_CAP_BUTT,
GSK_LINE_CAP_ROUND,
GSK_LINE_CAP_SQUARE
} GskLineCap;
/**
* GskLineJoin:
* @GSK_LINE_JOIN_MITER: Use a sharp angled corner
* @GSK_LINE_JOIN_ROUND: Use a round join, the center of the circle is
* the join point
* @GSK_LINE_JOIN_BEVEL: use a cut-off join, the join is cut off at half
* the line width from the joint point
*
* Specifies how to render the junction of two lines when stroking.
*
* The default line join style is `GSK_LINE_JOIN_MITER`.
*
* New entries may be added in future versions.
*
* <figure>
* <picture>
* <source srcset="join-dark.png" media="(prefers-color-scheme: dark)">
* <img alt="Line Join Styles" src="join-light.png">
* </picture>
* <figcaption>GSK_LINE_JOINT_MITER, GSK_LINE_JOINT_ROUND, GSK_LINE_JOIN_BEVEL</figcaption>
* </figure>
*
* Since: 4.14
*/
typedef enum {
GSK_LINE_JOIN_MITER,
GSK_LINE_JOIN_ROUND,
GSK_LINE_JOIN_BEVEL,
} GskLineJoin;
/**
* GskPathOperation:
* @GSK_PATH_MOVE: A move-to operation, with 1 point describing the target point.
* @GSK_PATH_CLOSE: A close operation ending the current contour with a line back
* to the starting point. Two points describe the start and end of the line.
* @GSK_PATH_LINE: A line-to operation, with 2 points describing the start and
* end point of a straight line.
* @GSK_PATH_QUAD: A curve-to operation describing a quadratic Bézier curve
* with 3 points describing the start point, the control point and the end
* point of the curve.
* @GSK_PATH_CUBIC: A curve-to operation describing a cubic Bézier curve with 4
* points describing the start point, the two control points and the end point
* of the curve.
* @GSK_PATH_CONIC: A rational quadratic Bézier curve with 3 points describing
* the start point, control point and end point of the curve. A weight for the
* curve will be passed, too.
*
* Path operations are used to describe the segments of a `GskPath`.
*
* More values may be added in the future.
*
* Since: 4.14
*/
typedef enum {
GSK_PATH_MOVE,
GSK_PATH_CLOSE,
GSK_PATH_LINE,
GSK_PATH_QUAD,
GSK_PATH_CUBIC,
GSK_PATH_CONIC,
} GskPathOperation;
/**
* GskPathDirection:
* @GSK_PATH_FROM_START: The tangent in path direction of the incoming side
* of the path
* @GSK_PATH_TO_START: The tangent against path direction of the incoming side
* of the path
* @GSK_PATH_TO_END: The tangent in path direction of the outgoing side
* of the path
* @GSK_PATH_FROM_END: The tangent against path direction of the outgoing
* side of the path
*
* The values of the `GskPathDirection` enum are used to pick one
* of the four tangents at a given point on the path.
*
* Note that the directions for @GSK_PATH_FROM_START/@GSK_PATH_TO_END and
* @GSK_PATH_TO_START/@GSK_PATH_FROM_END will coincide for smooth points.
* Only sharp turns will exhibit four different directions.
*
* <picture>
* <source srcset="directions-dark.png" media="(prefers-color-scheme: dark)">
* <img alt="Path Tangents" src="directions-light.png">
* </picture>
*
* Since: 4.14
*/
typedef enum {
GSK_PATH_FROM_START,
GSK_PATH_TO_START,
GSK_PATH_TO_END,
GSK_PATH_FROM_END,
} GskPathDirection;
/**
* GskSerializationError:
* @GSK_SERIALIZATION_UNSUPPORTED_FORMAT: The format can not be identified
* @GSK_SERIALIZATION_UNSUPPORTED_VERSION: The version of the data is not
* understood
* @GSK_SERIALIZATION_INVALID_DATA: The given data may not exist in
* a proper serialization
*
* Errors that can happen during (de)serialization.
*/
typedef enum {
GSK_SERIALIZATION_UNSUPPORTED_FORMAT,
GSK_SERIALIZATION_UNSUPPORTED_VERSION,
GSK_SERIALIZATION_INVALID_DATA
} GskSerializationError;
/**
* GskTransformCategory:
* @GSK_TRANSFORM_CATEGORY_UNKNOWN: The category of the matrix has not been
* determined.
* @GSK_TRANSFORM_CATEGORY_ANY: Analyzing the matrix concluded that it does
* not fit in any other category.
* @GSK_TRANSFORM_CATEGORY_3D: The matrix is a 3D matrix. This means that
* the w column (the last column) has the values (0, 0, 0, 1).
* @GSK_TRANSFORM_CATEGORY_2D: The matrix is a 2D matrix. This is equivalent
* to graphene_matrix_is_2d() returning %TRUE. In particular, this
* means that Cairo can deal with the matrix.
* @GSK_TRANSFORM_CATEGORY_2D_AFFINE: The matrix is a combination of 2D scale
* and 2D translation operations. In particular, this means that any
* rectangle can be transformed exactly using this matrix.
* @GSK_TRANSFORM_CATEGORY_2D_TRANSLATE: The matrix is a 2D translation.
* @GSK_TRANSFORM_CATEGORY_IDENTITY: The matrix is the identity matrix.
*
* The categories of matrices relevant for GSK and GTK.
*
* Note that any category includes matrices of all later categories.
* So if you want to for example check if a matrix is a 2D matrix,
* `category >= GSK_TRANSFORM_CATEGORY_2D` is the way to do this.
*
* Also keep in mind that rounding errors may cause matrices to not
* conform to their categories. Otherwise, matrix operations done via
* multiplication will not worsen categories. So for the matrix
* multiplication `C = A * B`, `category(C) = MIN (category(A), category(B))`.
*/
typedef enum
{
GSK_TRANSFORM_CATEGORY_UNKNOWN,
GSK_TRANSFORM_CATEGORY_ANY,
GSK_TRANSFORM_CATEGORY_3D,
GSK_TRANSFORM_CATEGORY_2D,
GSK_TRANSFORM_CATEGORY_2D_AFFINE,
GSK_TRANSFORM_CATEGORY_2D_TRANSLATE,
GSK_TRANSFORM_CATEGORY_IDENTITY
} GskTransformCategory;
/**
* GskGLUniformType:
* @GSK_GL_UNIFORM_TYPE_NONE: No type, used for uninitialized or unspecified values.
* @GSK_GL_UNIFORM_TYPE_FLOAT: A float uniform
* @GSK_GL_UNIFORM_TYPE_INT: A GLSL int / gint32 uniform
* @GSK_GL_UNIFORM_TYPE_UINT: A GLSL uint / guint32 uniform
* @GSK_GL_UNIFORM_TYPE_BOOL: A GLSL bool / gboolean uniform
* @GSK_GL_UNIFORM_TYPE_VEC2: A GLSL vec2 / graphene_vec2_t uniform
* @GSK_GL_UNIFORM_TYPE_VEC3: A GLSL vec3 / graphene_vec3_t uniform
* @GSK_GL_UNIFORM_TYPE_VEC4: A GLSL vec4 / graphene_vec4_t uniform
*
* This defines the types of the uniforms that `GskGLShaders`
* declare.
*
* It defines both what the type is called in the GLSL shader
* code, and what the corresponding C type is on the Gtk side.
*/
typedef enum
{
GSK_GL_UNIFORM_TYPE_NONE,
GSK_GL_UNIFORM_TYPE_FLOAT,
GSK_GL_UNIFORM_TYPE_INT,
GSK_GL_UNIFORM_TYPE_UINT,
GSK_GL_UNIFORM_TYPE_BOOL,
GSK_GL_UNIFORM_TYPE_VEC2,
GSK_GL_UNIFORM_TYPE_VEC3,
GSK_GL_UNIFORM_TYPE_VEC4,
} GskGLUniformType;
/**
* GskMaskMode:
* @GSK_MASK_MODE_ALPHA: Use the alpha channel of the mask
* @GSK_MASK_MODE_INVERTED_ALPHA: Use the inverted alpha channel of the mask
* @GSK_MASK_MODE_LUMINANCE: Use the luminance of the mask,
* multiplied by mask alpha
* @GSK_MASK_MODE_INVERTED_LUMINANCE: Use the inverted luminance of the mask,
* multiplied by mask alpha
*
* The mask modes available for mask nodes.
*
* Since: 4.10
*/
typedef enum
{
GSK_MASK_MODE_ALPHA,
GSK_MASK_MODE_INVERTED_ALPHA,
GSK_MASK_MODE_LUMINANCE,
GSK_MASK_MODE_INVERTED_LUMINANCE
} GskMaskMode;
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