forked from AuroraMiddleware/gtk
8920639a2b
GdkMemoryTexture is a texture implementation for holding data in memory (read: GBytes). You specify the GdkMemoryFormat that data is in and off you go. Renderers can use this to add uploads in various different formats and don't need to fallback to GDK doing the conersion on the CPU. Supported formats can be extended if we need new ones, for now I just added the relevant ones for Cairo and GdkPixbuf. The constructor is also private still, because I'm not sure we want to export GdkMemoryFormat. Wrappers that do from_cairo_surface() and for_pixbuf() do exist though.
263 lines
8.1 KiB
C
263 lines
8.1 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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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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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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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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g_bytes_get_data (self->bytes, NULL), self->stride,
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self->format,
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texture->width, texture->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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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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#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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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][2] =
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{
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{ convert_memcpy, convert_swizzle3210 },
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{ convert_swizzle3210, convert_memcpy },
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{ convert_swizzle_premultiply_3210_3210, convert_swizzle_premultiply_0123_3210 },
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{ convert_swizzle_premultiply_3210_0123, convert_swizzle_premultiply_0123_0123 },
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{ convert_swizzle_premultiply_3210_3012, convert_swizzle_premultiply_0123_3012 },
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{ convert_swizzle_premultiply_3210_0321, convert_swizzle_premultiply_0123_0321 },
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{ convert_swizzle_opaque_3210, convert_swizzle_opaque_3012 },
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{ convert_swizzle_opaque_0123, convert_swizzle_opaque_0321 }
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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 < 2);
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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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