forked from AuroraMiddleware/gtk
321 lines
9.8 KiB
C
321 lines
9.8 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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#include "config.h"
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#include "gdkmemorytextureprivate.h"
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/**
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* GdkMemoryTexture:
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*
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* A `GdkTexture` representing image data in memory.
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*/
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struct _GdkMemoryTexture
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{
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GdkTexture parent_instance;
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GdkMemoryFormat format;
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GBytes *bytes;
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gsize stride;
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};
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struct _GdkMemoryTextureClass
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{
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GdkTextureClass parent_class;
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};
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G_DEFINE_TYPE (GdkMemoryTexture, gdk_memory_texture, GDK_TYPE_TEXTURE)
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gsize
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gdk_memory_format_bytes_per_pixel (GdkMemoryFormat format)
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{
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switch (format)
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{
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case GDK_MEMORY_B8G8R8A8_PREMULTIPLIED:
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case GDK_MEMORY_A8R8G8B8_PREMULTIPLIED:
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case GDK_MEMORY_R8G8B8A8_PREMULTIPLIED:
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case GDK_MEMORY_B8G8R8A8:
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case GDK_MEMORY_A8R8G8B8:
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case GDK_MEMORY_R8G8B8A8:
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case GDK_MEMORY_A8B8G8R8:
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return 4;
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case GDK_MEMORY_R8G8B8:
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case GDK_MEMORY_B8G8R8:
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return 3;
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case GDK_MEMORY_N_FORMATS:
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default:
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g_assert_not_reached ();
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return 4;
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}
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}
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static void
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gdk_memory_texture_dispose (GObject *object)
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{
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GdkMemoryTexture *self = GDK_MEMORY_TEXTURE (object);
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g_clear_pointer (&self->bytes, g_bytes_unref);
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G_OBJECT_CLASS (gdk_memory_texture_parent_class)->dispose (object);
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}
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static void
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gdk_memory_texture_download (GdkTexture *texture,
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const GdkRectangle *area,
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guchar *data,
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gsize stride)
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{
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GdkMemoryTexture *self = GDK_MEMORY_TEXTURE (texture);
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gdk_memory_convert (data, stride,
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GDK_MEMORY_CAIRO_FORMAT_ARGB32,
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(guchar *) g_bytes_get_data (self->bytes, NULL)
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+ area->x * gdk_memory_format_bytes_per_pixel (self->format)
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+ area->y * self->stride,
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self->stride,
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self->format,
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area->width, area->height);
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}
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static void
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gdk_memory_texture_class_init (GdkMemoryTextureClass *klass)
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{
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GdkTextureClass *texture_class = GDK_TEXTURE_CLASS (klass);
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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texture_class->download = gdk_memory_texture_download;
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gobject_class->dispose = gdk_memory_texture_dispose;
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}
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static void
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gdk_memory_texture_init (GdkMemoryTexture *self)
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{
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}
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/**
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* gdk_memory_texture_new:
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* @width: the width of the texture
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* @height: the height of the texture
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* @format: the format of the data
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* @bytes: the `GBytes` containing the pixel data
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* @stride: rowstride for the data
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*
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* Creates a new texture for a blob of image data.
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*
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* The `GBytes` must contain @stride x @height pixels
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* in the given format.
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*
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* Returns: A newly-created `GdkTexture`
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*/
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GdkTexture *
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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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{
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GdkMemoryTexture *self;
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self = g_object_new (GDK_TYPE_MEMORY_TEXTURE,
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"width", width,
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"height", height,
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NULL);
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self->format = format;
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self->bytes = g_bytes_ref (bytes);
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self->stride = stride;
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return GDK_TEXTURE (self);
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}
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GdkMemoryFormat
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gdk_memory_texture_get_format (GdkMemoryTexture *self)
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{
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return self->format;
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}
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const guchar *
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gdk_memory_texture_get_data (GdkMemoryTexture *self)
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{
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return g_bytes_get_data (self->bytes, NULL);
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}
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gsize
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gdk_memory_texture_get_stride (GdkMemoryTexture *self)
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{
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return self->stride;
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}
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static void
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convert_memcpy (guchar *dest_data,
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gsize dest_stride,
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const guchar *src_data,
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gsize src_stride,
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gsize width,
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gsize height)
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{
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gsize y;
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for (y = 0; y < height; y++)
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memcpy (dest_data + y * dest_stride, src_data + y * src_stride, 4 * width);
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}
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#define SWIZZLE(A,R,G,B) \
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static void \
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convert_swizzle ## A ## R ## G ## B (guchar *dest_data, \
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gsize dest_stride, \
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const guchar *src_data, \
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gsize src_stride, \
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gsize width, \
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gsize height) \
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{ \
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gsize x, y; \
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\
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for (y = 0; y < height; y++) \
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{ \
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for (x = 0; x < width; x++) \
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{ \
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dest_data[4 * x + A] = src_data[4 * x + 0]; \
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dest_data[4 * x + R] = src_data[4 * x + 1]; \
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dest_data[4 * x + G] = src_data[4 * x + 2]; \
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dest_data[4 * x + B] = src_data[4 * x + 3]; \
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} \
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\
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dest_data += dest_stride; \
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src_data += src_stride; \
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} \
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}
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SWIZZLE(3,2,1,0)
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SWIZZLE(2,1,0,3)
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SWIZZLE(3,0,1,2)
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SWIZZLE(1,2,3,0)
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#define SWIZZLE_OPAQUE(A,R,G,B) \
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static void \
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convert_swizzle_opaque_## A ## R ## G ## B (guchar *dest_data, \
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gsize dest_stride, \
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const guchar *src_data, \
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gsize src_stride, \
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gsize width, \
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gsize height) \
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{ \
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gsize x, y; \
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\
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for (y = 0; y < height; y++) \
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{ \
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for (x = 0; x < width; x++) \
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{ \
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dest_data[4 * x + A] = 0xFF; \
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dest_data[4 * x + R] = src_data[3 * x + 0]; \
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dest_data[4 * x + G] = src_data[3 * x + 1]; \
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dest_data[4 * x + B] = src_data[3 * x + 2]; \
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} \
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\
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dest_data += dest_stride; \
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src_data += src_stride; \
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} \
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}
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SWIZZLE_OPAQUE(3,2,1,0)
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SWIZZLE_OPAQUE(3,0,1,2)
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SWIZZLE_OPAQUE(0,1,2,3)
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SWIZZLE_OPAQUE(0,3,2,1)
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#define PREMULTIPLY(d,c,a) G_STMT_START { guint t = c * a + 0x80; d = ((t >> 8) + t) >> 8; } G_STMT_END
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#define SWIZZLE_PREMULTIPLY(A,R,G,B, A2,R2,G2,B2) \
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static void \
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convert_swizzle_premultiply_ ## A ## R ## G ## B ## _ ## A2 ## R2 ## G2 ## B2 \
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(guchar *dest_data, \
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gsize dest_stride, \
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const guchar *src_data, \
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gsize src_stride, \
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gsize width, \
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gsize height) \
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{ \
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gsize x, y; \
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\
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for (y = 0; y < height; y++) \
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{ \
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for (x = 0; x < width; x++) \
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{ \
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dest_data[4 * x + A] = src_data[4 * x + A2]; \
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PREMULTIPLY(dest_data[4 * x + R], src_data[4 * x + R2], src_data[4 * x + A2]); \
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PREMULTIPLY(dest_data[4 * x + G], src_data[4 * x + G2], src_data[4 * x + A2]); \
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PREMULTIPLY(dest_data[4 * x + B], src_data[4 * x + B2], src_data[4 * x + A2]); \
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} \
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\
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dest_data += dest_stride; \
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src_data += src_stride; \
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} \
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}
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SWIZZLE_PREMULTIPLY (3,2,1,0, 3,2,1,0)
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SWIZZLE_PREMULTIPLY (0,1,2,3, 3,2,1,0)
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SWIZZLE_PREMULTIPLY (3,2,1,0, 0,1,2,3)
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SWIZZLE_PREMULTIPLY (0,1,2,3, 0,1,2,3)
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SWIZZLE_PREMULTIPLY (3,2,1,0, 3,0,1,2)
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SWIZZLE_PREMULTIPLY (0,1,2,3, 3,0,1,2)
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SWIZZLE_PREMULTIPLY (3,2,1,0, 0,3,2,1)
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SWIZZLE_PREMULTIPLY (0,1,2,3, 0,3,2,1)
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SWIZZLE_PREMULTIPLY (3,0,1,2, 3,2,1,0)
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SWIZZLE_PREMULTIPLY (3,0,1,2, 0,1,2,3)
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SWIZZLE_PREMULTIPLY (3,0,1,2, 3,0,1,2)
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SWIZZLE_PREMULTIPLY (3,0,1,2, 0,3,2,1)
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typedef void (* ConversionFunc) (guchar *dest_data,
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gsize dest_stride,
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const guchar *src_data,
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gsize src_stride,
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gsize width,
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gsize height);
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static ConversionFunc converters[GDK_MEMORY_N_FORMATS][3] =
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{
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{ convert_memcpy, convert_swizzle3210, convert_swizzle2103 },
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{ convert_swizzle3210, convert_memcpy, convert_swizzle3012 },
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{ convert_swizzle2103, convert_swizzle1230, convert_memcpy },
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{ convert_swizzle_premultiply_3210_3210, convert_swizzle_premultiply_0123_3210, convert_swizzle_premultiply_3012_3210, },
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{ convert_swizzle_premultiply_3210_0123, convert_swizzle_premultiply_0123_0123, convert_swizzle_premultiply_3012_0123 },
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{ convert_swizzle_premultiply_3210_3012, convert_swizzle_premultiply_0123_3012, convert_swizzle_premultiply_3012_3012 },
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{ convert_swizzle_premultiply_3210_0321, convert_swizzle_premultiply_0123_0321, convert_swizzle_premultiply_3012_0321 },
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{ convert_swizzle_opaque_3210, convert_swizzle_opaque_0123, convert_swizzle_opaque_3012 },
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{ convert_swizzle_opaque_3012, convert_swizzle_opaque_0321, convert_swizzle_opaque_3210 }
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};
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void
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gdk_memory_convert (guchar *dest_data,
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gsize dest_stride,
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GdkMemoryFormat dest_format,
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const guchar *src_data,
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gsize src_stride,
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GdkMemoryFormat src_format,
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gsize width,
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gsize height)
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{
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g_assert (dest_format < 3);
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g_assert (src_format < GDK_MEMORY_N_FORMATS);
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converters[src_format][dest_format] (dest_data, dest_stride, src_data, src_stride, width, height);
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}
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