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https://gitlab.gnome.org/GNOME/gtk.git
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dcba783389
Make it use gdk_memory_texture_from_texture(). Also make gdk_memory_format_alpha() privately available so that we can detect if an image contains an alpha channel.
498 lines
13 KiB
C
498 lines
13 KiB
C
/*
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* Copyright © 2021 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 "gdkmemoryformatprivate.h"
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#include "gsk/gl/fp16private.h"
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#include <epoxy/gl.h>
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typedef struct _GdkMemoryFormatDescription GdkMemoryFormatDescription;
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#define TYPED_FUNCS(name, T, R, G, B, A, bpp, scale) \
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static void \
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name ## _to_float (float *dest, \
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const guchar *src_data, \
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gsize n) \
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{ \
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for (gsize i = 0; i < n; i++) \
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{ \
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T *src = (T *) (src_data + i * bpp); \
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dest[0] = (float) src[R] / scale; \
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dest[1] = (float) src[G] / scale; \
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dest[2] = (float) src[B] / scale; \
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if (A >= 0) dest[3] = (float) src[A] / scale; else dest[3] = 1.0; \
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dest += 4; \
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} \
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} \
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\
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static void \
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name ## _from_float (guchar *dest_data, \
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const float *src, \
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gsize n) \
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{ \
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for (gsize i = 0; i < n; i++) \
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{ \
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T *dest = (T *) (dest_data + i * bpp); \
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dest[R] = CLAMP (src[0] * scale + 0.5, 0, scale); \
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dest[G] = CLAMP (src[1] * scale + 0.5, 0, scale); \
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dest[B] = CLAMP (src[2] * scale + 0.5, 0, scale); \
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if (A >= 0) dest[A] = CLAMP (src[3] * scale + 0.5, 0, scale); \
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src += 4; \
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} \
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}
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TYPED_FUNCS (b8g8r8a8_premultiplied, guchar, 2, 1, 0, 3, 4, 255)
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TYPED_FUNCS (a8r8g8b8_premultiplied, guchar, 1, 2, 3, 0, 4, 255)
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TYPED_FUNCS (r8g8b8a8_premultiplied, guchar, 0, 1, 2, 3, 4, 255)
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TYPED_FUNCS (b8g8r8a8, guchar, 2, 1, 0, 3, 4, 255)
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TYPED_FUNCS (a8r8g8b8, guchar, 1, 2, 3, 0, 4, 255)
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TYPED_FUNCS (r8g8b8a8, guchar, 0, 1, 2, 3, 4, 255)
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TYPED_FUNCS (a8b8g8r8, guchar, 3, 2, 1, 0, 4, 255)
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TYPED_FUNCS (r8g8b8, guchar, 0, 1, 2, -1, 3, 255)
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TYPED_FUNCS (b8g8r8, guchar, 2, 1, 0, -1, 3, 255)
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TYPED_FUNCS (r16g16b16, guint16, 0, 1, 2, -1, 6, 65535)
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TYPED_FUNCS (r16g16b16a16, guint16, 0, 1, 2, 3, 8, 65535)
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static void
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r16g16b16_float_to_float (float *dest,
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const guchar *src_data,
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gsize n)
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{
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guint16 *src = (guint16 *) src_data;
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for (gsize i = 0; i < n; i++)
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{
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half_to_float (src, dest, 3);
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dest[3] = 1.0;
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dest += 4;
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src += 3;
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}
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}
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static void
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r16g16b16_float_from_float (guchar *dest_data,
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const float *src,
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gsize n)
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{
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guint16 *dest = (guint16 *) dest_data;
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for (gsize i = 0; i < n; i++)
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{
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float_to_half (src, dest, 3);
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dest += 3;
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src += 4;
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}
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}
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static void
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r16g16b16a16_float_to_float (float *dest,
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const guchar *src,
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gsize n)
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{
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half_to_float ((const guint16 *) src, dest, 4 * n);
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}
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static void
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r16g16b16a16_float_from_float (guchar *dest,
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const float *src,
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gsize n)
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{
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float_to_half (src, (guint16 *) dest, 4 * n);
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}
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static void
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r32g32b32_float_to_float (float *dest,
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const guchar *src_data,
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gsize n)
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{
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float *src = (float *) src_data;
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for (gsize i = 0; i < n; i++)
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{
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dest[0] = src[0];
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dest[1] = src[1];
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dest[2] = src[2];
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dest[3] = 1.0;
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dest += 4;
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src += 3;
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}
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}
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static void
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r32g32b32_float_from_float (guchar *dest_data,
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const float *src,
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gsize n)
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{
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float *dest = (float *) dest_data;
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for (gsize i = 0; i < n; i++)
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{
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dest[0] = src[0];
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dest[1] = src[1];
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dest[2] = src[2];
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dest += 3;
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src += 4;
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}
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}
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static void
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r32g32b32a32_float_to_float (float *dest,
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const guchar *src,
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gsize n)
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{
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memcpy (dest, src, sizeof (float) * n * 4);
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}
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static void
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r32g32b32a32_float_from_float (guchar *dest,
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const float *src,
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gsize n)
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{
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memcpy (dest, src, sizeof (float) * n * 4);
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}
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struct _GdkMemoryFormatDescription
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{
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GdkMemoryAlpha alpha;
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gsize bytes_per_pixel;
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gsize alignment;
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gboolean prefers_high_depth;
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gboolean supports_gles;
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struct {
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guint internal_format;
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guint format;
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guint type;
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} gl;
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/* no premultiplication going on here */
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void (* to_float) (float *, const guchar*, gsize);
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void (* from_float) (guchar *, const float *, gsize);
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};
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#if G_BYTE_ORDER == G_LITTLE_ENDIAN
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# define GDK_GL_UNSIGNED_BYTE_FLIPPED GL_UNSIGNED_INT_8_8_8_8
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#elif G_BYTE_ORDER == G_BIG_ENDIAN
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# define GDK_GL_UNSIGNED_BYTE_FLIPPED GL_UNSIGNED_INT_8_8_8_8_REV
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#else
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# error "Define the right GL flags here"
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#endif
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static const GdkMemoryFormatDescription memory_formats[GDK_MEMORY_N_FORMATS] = {
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[GDK_MEMORY_B8G8R8A8_PREMULTIPLIED] = {
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GDK_MEMORY_ALPHA_PREMULTIPLIED,
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4,
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G_ALIGNOF (guchar),
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FALSE,
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FALSE,
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{ GL_RGBA8, GL_BGRA, GL_UNSIGNED_BYTE },
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b8g8r8a8_premultiplied_to_float,
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b8g8r8a8_premultiplied_from_float,
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},
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[GDK_MEMORY_A8R8G8B8_PREMULTIPLIED] = {
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GDK_MEMORY_ALPHA_PREMULTIPLIED,
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4,
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G_ALIGNOF (guchar),
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FALSE,
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FALSE,
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{ GL_RGBA8, GL_BGRA, GDK_GL_UNSIGNED_BYTE_FLIPPED },
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a8r8g8b8_premultiplied_to_float,
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a8r8g8b8_premultiplied_from_float,
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},
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[GDK_MEMORY_R8G8B8A8_PREMULTIPLIED] = {
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GDK_MEMORY_ALPHA_PREMULTIPLIED,
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4,
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G_ALIGNOF (guchar),
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FALSE,
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TRUE,
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{ GL_RGBA8, GL_RGBA, GL_UNSIGNED_BYTE },
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r8g8b8a8_premultiplied_to_float,
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r8g8b8a8_premultiplied_from_float,
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},
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[GDK_MEMORY_B8G8R8A8] = {
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GDK_MEMORY_ALPHA_STRAIGHT,
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4,
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G_ALIGNOF (guchar),
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FALSE,
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FALSE,
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{ GL_RGBA8, GL_BGRA, GL_UNSIGNED_BYTE },
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b8g8r8a8_to_float,
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b8g8r8a8_from_float,
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},
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[GDK_MEMORY_A8R8G8B8] = {
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GDK_MEMORY_ALPHA_STRAIGHT,
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4,
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G_ALIGNOF (guchar),
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FALSE,
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FALSE,
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{ GL_RGBA8, GL_RGBA, GDK_GL_UNSIGNED_BYTE_FLIPPED },
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a8r8g8b8_to_float,
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a8r8g8b8_from_float,
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},
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[GDK_MEMORY_R8G8B8A8] = {
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GDK_MEMORY_ALPHA_STRAIGHT,
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4,
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G_ALIGNOF (guchar),
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FALSE,
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TRUE,
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{ GL_RGBA8, GL_RGBA, GL_UNSIGNED_BYTE },
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r8g8b8a8_to_float,
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r8g8b8a8_from_float,
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},
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[GDK_MEMORY_A8B8G8R8] = {
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GDK_MEMORY_ALPHA_STRAIGHT,
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4,
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G_ALIGNOF (guchar),
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FALSE,
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FALSE,
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{ GL_RGBA8, GL_BGRA, GDK_GL_UNSIGNED_BYTE_FLIPPED },
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a8b8g8r8_to_float,
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a8b8g8r8_from_float,
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},
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[GDK_MEMORY_R8G8B8] = {
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GDK_MEMORY_ALPHA_OPAQUE,
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3,
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G_ALIGNOF (guchar),
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FALSE,
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TRUE,
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{ GL_RGB8, GL_RGB, GL_UNSIGNED_BYTE },
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r8g8b8_to_float,
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r8g8b8_from_float,
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},
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[GDK_MEMORY_B8G8R8] = {
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GDK_MEMORY_ALPHA_OPAQUE,
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3,
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G_ALIGNOF (guchar),
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FALSE,
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FALSE,
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{ GL_RGB8, GL_BGR, GL_UNSIGNED_BYTE },
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b8g8r8_to_float,
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b8g8r8_from_float,
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},
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[GDK_MEMORY_R16G16B16] = {
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GDK_MEMORY_ALPHA_OPAQUE,
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6,
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G_ALIGNOF (guint16),
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TRUE,
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TRUE,
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{ GL_RGB16, GL_RGB, GL_UNSIGNED_SHORT },
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r16g16b16_to_float,
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r16g16b16_from_float,
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},
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[GDK_MEMORY_R16G16B16A16_PREMULTIPLIED] = {
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GDK_MEMORY_ALPHA_PREMULTIPLIED,
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8,
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G_ALIGNOF (guint16),
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TRUE,
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TRUE,
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{ GL_RGBA16, GL_RGBA, GL_UNSIGNED_SHORT },
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r16g16b16a16_to_float,
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r16g16b16a16_from_float,
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},
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[GDK_MEMORY_R16G16B16A16] = {
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GDK_MEMORY_ALPHA_STRAIGHT,
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8,
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G_ALIGNOF (guint16),
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TRUE,
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TRUE,
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{ GL_RGBA16, GL_RGBA, GL_UNSIGNED_SHORT },
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r16g16b16a16_to_float,
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r16g16b16a16_from_float,
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},
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[GDK_MEMORY_R16G16B16_FLOAT] = {
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GDK_MEMORY_ALPHA_OPAQUE,
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6,
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G_ALIGNOF (guint16),
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TRUE,
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TRUE,
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{ GL_RGB16F, GL_RGB, GL_HALF_FLOAT },
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r16g16b16_float_to_float,
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r16g16b16_float_from_float,
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},
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[GDK_MEMORY_R16G16B16A16_FLOAT_PREMULTIPLIED] = {
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GDK_MEMORY_ALPHA_PREMULTIPLIED,
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8,
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G_ALIGNOF (guint16),
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TRUE,
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TRUE,
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{ GL_RGBA16F, GL_RGBA, GL_HALF_FLOAT },
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r16g16b16a16_float_to_float,
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r16g16b16a16_float_from_float,
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},
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[GDK_MEMORY_R16G16B16A16_FLOAT] = {
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GDK_MEMORY_ALPHA_STRAIGHT,
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8,
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G_ALIGNOF (guint16),
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TRUE,
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TRUE,
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{ GL_RGBA16F, GL_RGBA, GL_HALF_FLOAT },
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r16g16b16a16_float_to_float,
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r16g16b16a16_float_from_float,
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},
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[GDK_MEMORY_R32G32B32_FLOAT] = {
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GDK_MEMORY_ALPHA_OPAQUE,
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12,
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G_ALIGNOF (float),
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TRUE,
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TRUE,
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{ GL_RGB32F, GL_RGB, GL_FLOAT },
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r32g32b32_float_to_float,
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r32g32b32_float_from_float,
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},
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[GDK_MEMORY_R32G32B32A32_FLOAT_PREMULTIPLIED] = {
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GDK_MEMORY_ALPHA_PREMULTIPLIED,
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16,
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G_ALIGNOF (float),
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TRUE,
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TRUE,
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{ GL_RGBA32F, GL_RGBA, GL_FLOAT },
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r32g32b32a32_float_to_float,
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r32g32b32a32_float_from_float,
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},
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[GDK_MEMORY_R32G32B32A32_FLOAT] = {
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GDK_MEMORY_ALPHA_STRAIGHT,
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16,
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G_ALIGNOF (float),
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TRUE,
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TRUE,
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{ GL_RGBA32F, GL_RGBA, GL_FLOAT },
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r32g32b32a32_float_to_float,
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r32g32b32a32_float_from_float,
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}
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};
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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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return memory_formats[format].bytes_per_pixel;
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}
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GdkMemoryAlpha
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gdk_memory_format_alpha (GdkMemoryFormat format)
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{
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return memory_formats[format].alpha;
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}
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gsize
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gdk_memory_format_alignment (GdkMemoryFormat format)
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{
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return memory_formats[format].alignment;
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}
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/*<private>
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* gdk_memory_format_prefers_high_depth:
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* @format: a memory format
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*
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* Checks if the given format benefits from being rendered
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* in bit depths higher than 8bits per pixel. See
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* gsk_render_node_prefers_high_depth() for more information
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* on this.
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* Usually this is the case when
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* gdk_memory_format_bytes_per_pixel() is larger than 4.
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*
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* Returns: %TRUE if the format benefits from being
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* composited in hgiher bit depths.
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**/
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gboolean
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gdk_memory_format_prefers_high_depth (GdkMemoryFormat format)
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{
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return memory_formats[format].prefers_high_depth;
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}
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gboolean
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gdk_memory_format_gl_format (GdkMemoryFormat format,
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gboolean gles,
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guint *out_internal_format,
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guint *out_format,
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guint *out_type)
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{
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*out_internal_format = memory_formats[format].gl.internal_format;
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*out_format = memory_formats[format].gl.format;
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*out_type = memory_formats[format].gl.type;
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if (memory_formats[format].alpha == GDK_MEMORY_ALPHA_STRAIGHT)
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return FALSE;
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if (gles && !memory_formats[format].supports_gles)
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return FALSE;
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return TRUE;
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}
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static void
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premultiply (float *rgba,
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gsize n)
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{
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for (gsize i = 0; i < n; i++)
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{
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rgba[0] *= rgba[3];
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rgba[1] *= rgba[3];
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rgba[2] *= rgba[3];
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rgba += 4;
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}
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}
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static void
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unpremultiply (float *rgba,
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gsize n)
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{
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for (gsize i = 0; i < n; i++)
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{
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if (rgba[3] > 1/255.0)
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{
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rgba[0] /= rgba[3];
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rgba[1] /= rgba[3];
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rgba[2] /= rgba[3];
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}
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rgba += 4;
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}
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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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const GdkMemoryFormatDescription *dest_desc = &memory_formats[dest_format];
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const GdkMemoryFormatDescription *src_desc = &memory_formats[src_format];
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float *tmp;
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gsize y;
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g_assert (dest_format < GDK_MEMORY_N_FORMATS);
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g_assert (src_format < GDK_MEMORY_N_FORMATS);
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tmp = g_new (float, width * 4);
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for (y = 0; y < height; y++)
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{
|
|
src_desc->to_float (tmp, src_data, width);
|
|
if (src_desc->alpha == GDK_MEMORY_ALPHA_PREMULTIPLIED && dest_desc->alpha == GDK_MEMORY_ALPHA_STRAIGHT)
|
|
unpremultiply (tmp, width);
|
|
else if (src_desc->alpha == GDK_MEMORY_ALPHA_STRAIGHT && dest_desc->alpha != GDK_MEMORY_ALPHA_STRAIGHT)
|
|
premultiply (tmp, width);
|
|
dest_desc->from_float (dest_data, tmp, width);
|
|
src_data += src_stride;
|
|
dest_data += dest_stride;
|
|
}
|
|
|
|
g_free (tmp);
|
|
}
|