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114 lines
4.2 KiB
C
114 lines
4.2 KiB
C
/*
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* Copyright © 2018 Benjamin Otte
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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* Authors: Benjamin Otte <otte@gnome.org>
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*/
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#ifndef __GDK_MEMORY_TEXTURE__H__
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#define __GDK_MEMORY_TEXTURE__H__
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#if !defined (__GDK_H_INSIDE__) && !defined (GDK_COMPILATION)
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#error "Only <gdk/gdk.h> can be included directly."
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#endif
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#include <gdk/gdktexture.h>
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G_BEGIN_DECLS
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/**
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* GdkMemoryFormat:
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* @GDK_MEMORY_B8G8R8A8_PREMULTIPLIED: 4 bytes; for blue, green, red, alpha.
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* The color values are premultiplied with the alpha value.
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* @GDK_MEMORY_A8R8G8B8_PREMULTIPLIED: 4 bytes; for alpha, red, green, blue.
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* The color values are premultiplied with the alpha value.
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* @GDK_MEMORY_B8G8R8A8: 4 bytes; for blue, green, red, alpha.
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* @GDK_MEMORY_A8R8G8B8: 4 bytes; for alpha, red, green, blue.
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* @GDK_MEMORY_R8G8B8A8: 4 bytes; for red, green, blue, alpha.
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* @GDK_MEMORY_A8B8G8R8: 4 bytes; for alpha, blue, green, red.
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* @GDK_MEMORY_R8G8B8: 3 bytes; for red, green, blue. The data is opaque.
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* @GDK_MEMORY_B8G8R8: 3 bytes; for blue, green, red. The data is opaque.
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* @GDK_MEMORY_N_FORMATS: The number of formats. This value will change as
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* more formats get added, so do not rely on its concrete integer.
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*
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* #GdkMemoryFormat describes a format that bytes can have in memory.
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*
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* It describes formats by listing the contents of the memory passed to it.
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* So GDK_MEMORY_A8R8G8B8 will be 1 byte (8 bits) of alpha, followed by a
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* byte each of red, green and blue. It is not endian-dependent, so
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* CAIRO_FORMAT_ARGB32 is represented by different #GdkMemoryFormats on
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* architectures with different endiannesses.
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*
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* Its naming is modelled after VkFormat (see
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* https://www.khronos.org/registry/vulkan/specs/1.0/html/vkspec.html#VkFormat
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* for details).
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*/
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typedef enum {
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GDK_MEMORY_B8G8R8A8_PREMULTIPLIED,
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GDK_MEMORY_A8R8G8B8_PREMULTIPLIED,
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GDK_MEMORY_B8G8R8A8,
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GDK_MEMORY_A8R8G8B8,
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GDK_MEMORY_R8G8B8A8,
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GDK_MEMORY_A8B8G8R8,
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GDK_MEMORY_R8G8B8,
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GDK_MEMORY_B8G8R8,
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GDK_MEMORY_N_FORMATS
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} GdkMemoryFormat;
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/**
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* GDK_MEMORY_DEFAULT:
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*
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* This is the default memory format used by GTK and is the format
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* provided by gdk_texture_download(). It is equal to
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* %CAIRO_FORMAT_ARGB32.
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*
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* Be aware that unlike the #GdkMemoryFormat values, this format is
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* different for different endianness.
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*/
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#if G_BYTE_ORDER == G_LITTLE_ENDIAN
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#define GDK_MEMORY_DEFAULT GDK_MEMORY_B8G8R8A8_PREMULTIPLIED
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#elif G_BYTE_ORDER == G_BIG_ENDIAN
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#define GDK_MEMORY_DEFAULT GDK_MEMORY_A8R8G8B8_PREMULTIPLIED
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#else
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#error "Unknown byte order for GDK_MEMORY_DEFAULT"
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#endif
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#define GDK_TYPE_MEMORY_TEXTURE (gdk_memory_texture_get_type ())
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#define GDK_MEMORY_TEXTURE(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GDK_TYPE_MEMORY_TEXTURE, GdkMemoryTexture))
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#define GDK_IS_MEMORY_TEXTURE(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GDK_TYPE_MEMORY_TEXTURE))
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typedef struct _GdkMemoryTexture GdkMemoryTexture;
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typedef struct _GdkMemoryTextureClass GdkMemoryTextureClass;
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G_DEFINE_AUTOPTR_CLEANUP_FUNC(GdkMemoryTexture, g_object_unref)
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GDK_AVAILABLE_IN_ALL
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GType gdk_memory_texture_get_type (void) G_GNUC_CONST;
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GDK_AVAILABLE_IN_ALL
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GdkTexture * gdk_memory_texture_new (int width,
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int height,
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GdkMemoryFormat format,
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GBytes *bytes,
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gsize stride);
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G_END_DECLS
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#endif /* __GDK_MEMORY_TEXTURE_H__ */
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