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gtk/gdk/gdkmemoryformat.c
Benjamin Otte b1b8a98568 gdk: Add function to query alpha format for depth 
It's meant to be used in renderers.
2023-07-22 01:33:44 +02:00

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/*
* Copyright © 2021 Benjamin Otte
*
* 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 2.1 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/>.
*
* Authors: Benjamin Otte <otte@gnome.org>
*/
#include "config.h"
#include "gdkmemoryformatprivate.h"
#include "gsk/gl/fp16private.h"
#include <epoxy/gl.h>
typedef struct _GdkMemoryFormatDescription GdkMemoryFormatDescription;
#define TYPED_FUNCS(name, T, R, G, B, A, bpp, scale) \
static void \
name ## _to_float (float *dest, \
const guchar *src_data, \
gsize n) \
{ \
for (gsize i = 0; i < n; i++) \
{ \
T *src = (T *) (src_data + i * bpp); \
dest[0] = (float) src[R] / scale; \
dest[1] = (float) src[G] / scale; \
dest[2] = (float) src[B] / scale; \
if (A >= 0) dest[3] = (float) src[A] / scale; else dest[3] = 1.0; \
dest += 4; \
} \
} \
\
static void \
name ## _from_float (guchar *dest_data, \
const float *src, \
gsize n) \
{ \
for (gsize i = 0; i < n; i++) \
{ \
T *dest = (T *) (dest_data + i * bpp); \
dest[R] = CLAMP (src[0] * scale + 0.5, 0, scale); \
dest[G] = CLAMP (src[1] * scale + 0.5, 0, scale); \
dest[B] = CLAMP (src[2] * scale + 0.5, 0, scale); \
if (A >= 0) dest[A] = CLAMP (src[3] * scale + 0.5, 0, scale); \
src += 4; \
} \
}
#define TYPED_GRAY_FUNCS(name, T, G, A, bpp, scale) \
static void \
name ## _to_float (float *dest, \
const guchar *src_data, \
gsize n) \
{ \
for (gsize i = 0; i < n; i++) \
{ \
T *src = (T *) (src_data + i * bpp); \
if (A >= 0) dest[3] = (float) src[A] / scale; else dest[3] = 1.0; \
if (G >= 0) dest[0] = (float) src[G] / scale; else dest[0] = dest[3]; \
dest[1] = dest[2] = dest[0]; \
dest += 4; \
} \
} \
\
static void \
name ## _from_float (guchar *dest_data, \
const float *src, \
gsize n) \
{ \
for (gsize i = 0; i < n; i++) \
{ \
T *dest = (T *) (dest_data + i * bpp); \
if (G >= 0) dest[G] = CLAMP ((src[0] + src[1] + src[2]) * scale / 3.f + 0.5, 0, scale); \
if (A >= 0) dest[A] = CLAMP (src[3] * scale + 0.5, 0, scale); \
src += 4; \
} \
}
TYPED_FUNCS (b8g8r8a8_premultiplied, guchar, 2, 1, 0, 3, 4, 255)
TYPED_FUNCS (a8r8g8b8_premultiplied, guchar, 1, 2, 3, 0, 4, 255)
TYPED_FUNCS (r8g8b8a8_premultiplied, guchar, 0, 1, 2, 3, 4, 255)
TYPED_FUNCS (b8g8r8a8, guchar, 2, 1, 0, 3, 4, 255)
TYPED_FUNCS (a8r8g8b8, guchar, 1, 2, 3, 0, 4, 255)
TYPED_FUNCS (r8g8b8a8, guchar, 0, 1, 2, 3, 4, 255)
TYPED_FUNCS (a8b8g8r8, guchar, 3, 2, 1, 0, 4, 255)
TYPED_FUNCS (r8g8b8, guchar, 0, 1, 2, -1, 3, 255)
TYPED_FUNCS (b8g8r8, guchar, 2, 1, 0, -1, 3, 255)
TYPED_FUNCS (r16g16b16, guint16, 0, 1, 2, -1, 6, 65535)
TYPED_FUNCS (r16g16b16a16, guint16, 0, 1, 2, 3, 8, 65535)
TYPED_GRAY_FUNCS (g8a8_premultiplied, guchar, 0, 1, 2, 255)
TYPED_GRAY_FUNCS (g8a8, guchar, 0, 1, 2, 255)
TYPED_GRAY_FUNCS (g8, guchar, 0, -1, 1, 255)
TYPED_GRAY_FUNCS (a8, guchar, -1, 0, 1, 255)
TYPED_GRAY_FUNCS (g16a16_premultiplied, guint16, 0, 1, 4, 65535)
TYPED_GRAY_FUNCS (g16a16, guint16, 0, 1, 4, 65535)
TYPED_GRAY_FUNCS (g16, guint16, 0, -1, 2, 65535)
TYPED_GRAY_FUNCS (a16, guint16, -1, 0, 2, 65535)
static void
r16g16b16_float_to_float (float *dest,
const guchar *src_data,
gsize n)
{
guint16 *src = (guint16 *) src_data;
for (gsize i = 0; i < n; i++)
{
half_to_float (src, dest, 3);
dest[3] = 1.0;
dest += 4;
src += 3;
}
}
static void
r16g16b16_float_from_float (guchar *dest_data,
const float *src,
gsize n)
{
guint16 *dest = (guint16 *) dest_data;
for (gsize i = 0; i < n; i++)
{
float_to_half (src, dest, 3);
dest += 3;
src += 4;
}
}
static void
r16g16b16a16_float_to_float (float *dest,
const guchar *src,
gsize n)
{
half_to_float ((const guint16 *) src, dest, 4 * n);
}
static void
r16g16b16a16_float_from_float (guchar *dest,
const float *src,
gsize n)
{
float_to_half (src, (guint16 *) dest, 4 * n);
}
static void
a16_float_to_float (float *dest,
const guchar *src_data,
gsize n)
{
const guint16 *src = (const guint16 *) src_data;
for (gsize i = 0; i < n; i++)
{
half_to_float (src, dest, 1);
dest[1] = dest[0];
dest[2] = dest[0];
dest[3] = dest[0];
src++;
dest += 4;
}
}
static void
a16_float_from_float (guchar *dest_data,
const float *src,
gsize n)
{
guint16 *dest = (guint16 *) dest_data;
for (gsize i = 0; i < n; i++)
{
float_to_half (&src[3], dest, 1);
dest ++;
src += 4;
}
}
static void
r32g32b32_float_to_float (float *dest,
const guchar *src_data,
gsize n)
{
float *src = (float *) src_data;
for (gsize i = 0; i < n; i++)
{
dest[0] = src[0];
dest[1] = src[1];
dest[2] = src[2];
dest[3] = 1.0;
dest += 4;
src += 3;
}
}
static void
r32g32b32_float_from_float (guchar *dest_data,
const float *src,
gsize n)
{
float *dest = (float *) dest_data;
for (gsize i = 0; i < n; i++)
{
dest[0] = src[0];
dest[1] = src[1];
dest[2] = src[2];
dest += 3;
src += 4;
}
}
static void
r32g32b32a32_float_to_float (float *dest,
const guchar *src,
gsize n)
{
memcpy (dest, src, sizeof (float) * n * 4);
}
static void
r32g32b32a32_float_from_float (guchar *dest,
const float *src,
gsize n)
{
memcpy (dest, src, sizeof (float) * n * 4);
}
static void
a32_float_to_float (float *dest,
const guchar *src_data,
gsize n)
{
const float *src = (const float *) src_data;
for (gsize i = 0; i < n; i++)
{
dest[0] = src[0];
dest[1] = src[0];
dest[2] = src[0];
dest[3] = src[0];
src++;
dest += 4;
}
}
static void
a32_float_from_float (guchar *dest_data,
const float *src,
gsize n)
{
float *dest = (float *) dest_data;
for (gsize i = 0; i < n; i++)
{
dest[0] = src[3];
dest ++;
src += 4;
}
}
#define PREMULTIPLY_FUNC(name, R1, G1, B1, A1, R2, G2, B2, A2) \
static void \
name (guchar *dest, \
const guchar *src, \
gsize n) \
{ \
for (; n > 0; n--) \
{ \
guchar a = src[A1]; \
guint16 r = (guint16)src[R1] * a + 127; \
guint16 g = (guint16)src[G1] * a + 127; \
guint16 b = (guint16)src[B1] * a + 127; \
dest[R2] = (r + (r >> 8) + 1) >> 8; \
dest[G2] = (g + (g >> 8) + 1) >> 8; \
dest[B2] = (b + (b >> 8) + 1) >> 8; \
dest[A2] = a; \
dest += 4; \
src += 4; \
} \
}
PREMULTIPLY_FUNC(r8g8b8a8_to_r8g8b8a8_premultiplied, 0, 1, 2, 3, 0, 1, 2, 3)
PREMULTIPLY_FUNC(r8g8b8a8_to_b8g8r8a8_premultiplied, 0, 1, 2, 3, 2, 1, 0, 3)
PREMULTIPLY_FUNC(r8g8b8a8_to_a8r8g8b8_premultiplied, 0, 1, 2, 3, 1, 2, 3, 0)
PREMULTIPLY_FUNC(r8g8b8a8_to_a8b8g8r8_premultiplied, 0, 1, 2, 3, 3, 2, 1, 0)
#define ADD_ALPHA_FUNC(name, R1, G1, B1, R2, G2, B2, A2) \
static void \
name (guchar *dest, \
const guchar *src, \
gsize n) \
{ \
for (; n > 0; n--) \
{ \
dest[R2] = src[R1]; \
dest[G2] = src[G1]; \
dest[B2] = src[B1]; \
dest[A2] = 255; \
dest += 4; \
src += 3; \
} \
}
ADD_ALPHA_FUNC(r8g8b8_to_r8g8b8a8, 0, 1, 2, 0, 1, 2, 3)
ADD_ALPHA_FUNC(r8g8b8_to_b8g8r8a8, 0, 1, 2, 2, 1, 0, 3)
ADD_ALPHA_FUNC(r8g8b8_to_a8r8g8b8, 0, 1, 2, 1, 2, 3, 0)
ADD_ALPHA_FUNC(r8g8b8_to_a8b8g8r8, 0, 1, 2, 3, 2, 1, 0)
struct _GdkMemoryFormatDescription
{
GdkMemoryAlpha alpha;
gsize bytes_per_pixel;
gsize alignment;
GdkMemoryDepth depth;
struct {
guint gl_major;
guint gl_minor;
guint gles_major;
guint gles_minor;
} min_gl_version;
struct {
guint internal_format;
guint format;
guint type;
GLint swizzle[4];
} gl;
/* no premultiplication going on here */
void (* to_float) (float *, const guchar*, gsize);
void (* from_float) (guchar *, const float *, gsize);
};
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
# define GDK_GL_UNSIGNED_BYTE_FLIPPED GL_UNSIGNED_INT_8_8_8_8
#elif G_BYTE_ORDER == G_BIG_ENDIAN
# define GDK_GL_UNSIGNED_BYTE_FLIPPED GL_UNSIGNED_INT_8_8_8_8_REV
#else
# error "Define the right GL flags here"
#endif
static const GdkMemoryFormatDescription memory_formats[] = {
[GDK_MEMORY_B8G8R8A8_PREMULTIPLIED] = {
GDK_MEMORY_ALPHA_PREMULTIPLIED,
4,
G_ALIGNOF (guchar),
GDK_MEMORY_U8,
{ 0, 0, G_MAXUINT, G_MAXUINT },
{ GL_RGBA8, GL_BGRA, GL_UNSIGNED_BYTE, { GL_RED, GL_GREEN, GL_BLUE, GL_ALPHA } },
b8g8r8a8_premultiplied_to_float,
b8g8r8a8_premultiplied_from_float,
},
[GDK_MEMORY_A8R8G8B8_PREMULTIPLIED] = {
GDK_MEMORY_ALPHA_PREMULTIPLIED,
4,
G_ALIGNOF (guchar),
GDK_MEMORY_U8,
{ 0, 0, G_MAXUINT, G_MAXUINT },
{ GL_RGBA8, GL_BGRA, GDK_GL_UNSIGNED_BYTE_FLIPPED, { GL_RED, GL_GREEN, GL_BLUE, GL_ALPHA } },
a8r8g8b8_premultiplied_to_float,
a8r8g8b8_premultiplied_from_float,
},
[GDK_MEMORY_R8G8B8A8_PREMULTIPLIED] = {
GDK_MEMORY_ALPHA_PREMULTIPLIED,
4,
G_ALIGNOF (guchar),
GDK_MEMORY_U8,
{ 0, 0, 0, 0 },
{ GL_RGBA8, GL_RGBA, GL_UNSIGNED_BYTE, { GL_RED, GL_GREEN, GL_BLUE, GL_ALPHA } },
r8g8b8a8_premultiplied_to_float,
r8g8b8a8_premultiplied_from_float,
},
[GDK_MEMORY_B8G8R8A8] = {
GDK_MEMORY_ALPHA_STRAIGHT,
4,
G_ALIGNOF (guchar),
GDK_MEMORY_U8,
{ 0, 0, G_MAXUINT, G_MAXUINT },
{ GL_RGBA8, GL_BGRA, GL_UNSIGNED_BYTE, { GL_RED, GL_GREEN, GL_BLUE, GL_ALPHA } },
b8g8r8a8_to_float,
b8g8r8a8_from_float,
},
[GDK_MEMORY_A8R8G8B8] = {
GDK_MEMORY_ALPHA_STRAIGHT,
4,
G_ALIGNOF (guchar),
GDK_MEMORY_U8,
{ 0, 0, G_MAXUINT, G_MAXUINT },
{ GL_RGBA8, GL_RGBA, GDK_GL_UNSIGNED_BYTE_FLIPPED, { GL_RED, GL_GREEN, GL_BLUE, GL_ALPHA } },
a8r8g8b8_to_float,
a8r8g8b8_from_float,
},
[GDK_MEMORY_R8G8B8A8] = {
GDK_MEMORY_ALPHA_STRAIGHT,
4,
G_ALIGNOF (guchar),
GDK_MEMORY_U8,
{ 0, 0, 0, 0 },
{ GL_RGBA8, GL_RGBA, GL_UNSIGNED_BYTE, { GL_RED, GL_GREEN, GL_BLUE, GL_ALPHA } },
r8g8b8a8_to_float,
r8g8b8a8_from_float,
},
[GDK_MEMORY_A8B8G8R8] = {
GDK_MEMORY_ALPHA_STRAIGHT,
4,
G_ALIGNOF (guchar),
GDK_MEMORY_U8,
{ 0, 0, G_MAXUINT, G_MAXUINT },
{ GL_RGBA8, GL_BGRA, GDK_GL_UNSIGNED_BYTE_FLIPPED, { GL_RED, GL_GREEN, GL_BLUE, GL_ALPHA } },
a8b8g8r8_to_float,
a8b8g8r8_from_float,
},
[GDK_MEMORY_R8G8B8] = {
GDK_MEMORY_ALPHA_OPAQUE,
3,
G_ALIGNOF (guchar),
GDK_MEMORY_U8,
{ 0, 0, 0, 0 },
{ GL_RGB8, GL_RGB, GL_UNSIGNED_BYTE, { GL_RED, GL_GREEN, GL_BLUE, GL_ONE } },
r8g8b8_to_float,
r8g8b8_from_float,
},
[GDK_MEMORY_B8G8R8] = {
GDK_MEMORY_ALPHA_OPAQUE,
3,
G_ALIGNOF (guchar),
GDK_MEMORY_U8,
{ 0, 0, G_MAXUINT, G_MAXUINT },
{ GL_RGB8, GL_BGR, GL_UNSIGNED_BYTE, { GL_RED, GL_GREEN, GL_BLUE, GL_ONE } },
b8g8r8_to_float,
b8g8r8_from_float,
},
[GDK_MEMORY_R16G16B16] = {
GDK_MEMORY_ALPHA_OPAQUE,
6,
G_ALIGNOF (guint16),
GDK_MEMORY_U16,
{ 0, 0, 3, 0 },
{ GL_RGB16, GL_RGB, GL_UNSIGNED_SHORT, { GL_RED, GL_GREEN, GL_BLUE, GL_ONE } },
r16g16b16_to_float,
r16g16b16_from_float,
},
[GDK_MEMORY_R16G16B16A16_PREMULTIPLIED] = {
GDK_MEMORY_ALPHA_PREMULTIPLIED,
8,
G_ALIGNOF (guint16),
GDK_MEMORY_U16,
{ 0, 0, 3, 0 },
{ GL_RGBA16, GL_RGBA, GL_UNSIGNED_SHORT, { GL_RED, GL_GREEN, GL_BLUE, GL_ALPHA } },
r16g16b16a16_to_float,
r16g16b16a16_from_float,
},
[GDK_MEMORY_R16G16B16A16] = {
GDK_MEMORY_ALPHA_STRAIGHT,
8,
G_ALIGNOF (guint16),
GDK_MEMORY_U16,
{ 0, 0, 3, 0 },
{ GL_RGBA16, GL_RGBA, GL_UNSIGNED_SHORT, { GL_RED, GL_GREEN, GL_BLUE, GL_ALPHA } },
r16g16b16a16_to_float,
r16g16b16a16_from_float,
},
[GDK_MEMORY_R16G16B16_FLOAT] = {
GDK_MEMORY_ALPHA_OPAQUE,
6,
G_ALIGNOF (guint16),
GDK_MEMORY_FLOAT16,
{ 0, 0, 3, 0 },
{ GL_RGB16F, GL_RGB, GL_HALF_FLOAT, { GL_RED, GL_GREEN, GL_BLUE, GL_ONE } },
r16g16b16_float_to_float,
r16g16b16_float_from_float,
},
[GDK_MEMORY_R16G16B16A16_FLOAT_PREMULTIPLIED] = {
GDK_MEMORY_ALPHA_PREMULTIPLIED,
8,
G_ALIGNOF (guint16),
GDK_MEMORY_FLOAT16,
{ 0, 0, 3, 0 },
{ GL_RGBA16F, GL_RGBA, GL_HALF_FLOAT, { GL_RED, GL_GREEN, GL_BLUE, GL_ALPHA } },
r16g16b16a16_float_to_float,
r16g16b16a16_float_from_float,
},
[GDK_MEMORY_R16G16B16A16_FLOAT] = {
GDK_MEMORY_ALPHA_STRAIGHT,
8,
G_ALIGNOF (guint16),
GDK_MEMORY_FLOAT16,
{ 0, 0, 3, 0 },
{ GL_RGBA16F, GL_RGBA, GL_HALF_FLOAT, { GL_RED, GL_GREEN, GL_BLUE, GL_ALPHA } },
r16g16b16a16_float_to_float,
r16g16b16a16_float_from_float,
},
[GDK_MEMORY_R32G32B32_FLOAT] = {
GDK_MEMORY_ALPHA_OPAQUE,
12,
G_ALIGNOF (float),
GDK_MEMORY_FLOAT32,
{ 0, 0, 3, 0 },
{ GL_RGB32F, GL_RGB, GL_FLOAT, { GL_RED, GL_GREEN, GL_BLUE, GL_ONE } },
r32g32b32_float_to_float,
r32g32b32_float_from_float,
},
[GDK_MEMORY_R32G32B32A32_FLOAT_PREMULTIPLIED] = {
GDK_MEMORY_ALPHA_PREMULTIPLIED,
16,
G_ALIGNOF (float),
TRUE,
{ 0, 0, 3, 0 },
{ GL_RGBA32F, GL_RGBA, GL_FLOAT, { GL_RED, GL_GREEN, GL_BLUE, GL_ALPHA } },
r32g32b32a32_float_to_float,
r32g32b32a32_float_from_float,
},
[GDK_MEMORY_R32G32B32A32_FLOAT] = {
GDK_MEMORY_ALPHA_STRAIGHT,
16,
G_ALIGNOF (float),
GDK_MEMORY_FLOAT32,
{ 0, 0, 3, 0 },
{ GL_RGBA32F, GL_RGBA, GL_FLOAT, { GL_RED, GL_GREEN, GL_BLUE, GL_ALPHA } },
r32g32b32a32_float_to_float,
r32g32b32a32_float_from_float,
},
[GDK_MEMORY_G8A8_PREMULTIPLIED] = {
GDK_MEMORY_ALPHA_PREMULTIPLIED,
2,
G_ALIGNOF (guchar),
GDK_MEMORY_U8,
{ 0, 0, 3, 0 },
{ GL_RG8, GL_RG, GL_UNSIGNED_BYTE, { GL_RED, GL_RED, GL_RED, GL_GREEN } },
g8a8_premultiplied_to_float,
g8a8_premultiplied_from_float,
},
[GDK_MEMORY_G8A8] = {
GDK_MEMORY_ALPHA_STRAIGHT,
2,
G_ALIGNOF (guchar),
GDK_MEMORY_U8,
{ 0, 0, 3, 0 },
{ GL_RG8, GL_RG, GL_UNSIGNED_BYTE, { GL_RED, GL_RED, GL_RED, GL_GREEN } },
g8a8_to_float,
g8a8_from_float,
},
[GDK_MEMORY_G8] = {
GDK_MEMORY_ALPHA_OPAQUE,
1,
G_ALIGNOF (guchar),
GDK_MEMORY_U8,
{ 0, 0, 3, 0 },
{ GL_R8, GL_RED, GL_UNSIGNED_BYTE, { GL_RED, GL_RED, GL_RED, GL_ONE } },
g8_to_float,
g8_from_float,
},
[GDK_MEMORY_G16A16_PREMULTIPLIED] = {
GDK_MEMORY_ALPHA_PREMULTIPLIED,
4,
G_ALIGNOF (guint16),
GDK_MEMORY_U16,
{ 0, 0, 3, 0 },
{ GL_RG16, GL_RG, GL_UNSIGNED_SHORT, { GL_RED, GL_RED, GL_RED, GL_GREEN } },
g16a16_premultiplied_to_float,
g16a16_premultiplied_from_float,
},
[GDK_MEMORY_G16A16] = {
GDK_MEMORY_ALPHA_STRAIGHT,
4,
G_ALIGNOF (guint16),
GDK_MEMORY_U16,
{ 0, 0, 3, 0 },
{ GL_RG16, GL_RG, GL_UNSIGNED_SHORT, { GL_RED, GL_RED, GL_RED, GL_GREEN } },
g16a16_to_float,
g16a16_from_float,
},
[GDK_MEMORY_G16] = {
GDK_MEMORY_ALPHA_OPAQUE,
2,
G_ALIGNOF (guint16),
GDK_MEMORY_U16,
{ 0, 0, 3, 0 },
{ GL_R16, GL_RED, GL_UNSIGNED_SHORT, { GL_RED, GL_RED, GL_RED, GL_ONE } },
g16_to_float,
g16_from_float,
},
[GDK_MEMORY_A8] = {
GDK_MEMORY_ALPHA_PREMULTIPLIED,
1,
G_ALIGNOF (guchar),
GDK_MEMORY_U8,
{ 0, 0, 3, 0 },
{ GL_R8, GL_RED, GL_UNSIGNED_BYTE, { GL_RED, GL_RED, GL_RED, GL_RED } },
a8_to_float,
a8_from_float,
},
[GDK_MEMORY_A16] = {
GDK_MEMORY_ALPHA_PREMULTIPLIED,
2,
G_ALIGNOF (guint16),
GDK_MEMORY_U16,
{ 0, 0, 3, 0 },
{ GL_R16, GL_RED, GL_UNSIGNED_SHORT, { GL_RED, GL_RED, GL_RED, GL_RED } },
a16_to_float,
a16_from_float,
},
[GDK_MEMORY_A16_FLOAT] = {
GDK_MEMORY_ALPHA_PREMULTIPLIED,
2,
G_ALIGNOF (guint16),
GDK_MEMORY_FLOAT16,
{ 0, 0, 3, 0 },
{ GL_R16F, GL_RED, GL_HALF_FLOAT, { GL_RED, GL_RED, GL_RED, GL_RED } },
a16_float_to_float,
a16_float_from_float,
},
[GDK_MEMORY_A32_FLOAT] = {
GDK_MEMORY_ALPHA_PREMULTIPLIED,
4,
G_ALIGNOF (float),
GDK_MEMORY_FLOAT32,
{ 0, 0, 3, 0 },
{ GL_R32F, GL_RED, GL_FLOAT, { GL_RED, GL_RED, GL_RED, GL_RED } },
a32_float_to_float,
a32_float_from_float,
}
};
/* if this fails, somebody forgot to add formats above */
G_STATIC_ASSERT (G_N_ELEMENTS (memory_formats) == GDK_MEMORY_N_FORMATS);
gsize
gdk_memory_format_bytes_per_pixel (GdkMemoryFormat format)
{
return memory_formats[format].bytes_per_pixel;
}
GdkMemoryAlpha
gdk_memory_format_alpha (GdkMemoryFormat format)
{
return memory_formats[format].alpha;
}
gsize
gdk_memory_format_alignment (GdkMemoryFormat format)
{
return memory_formats[format].alignment;
}
/*<private>
* gdk_memory_format_get_depth:
* @format: a memory format
*
* Gets the depth of the individual channels of the format.
* See gsk_render_node_prefers_high_depth() for more
* information on this.
*
* Usually renderers want to use higher depth for render
* targets to match these formats.
*
* Returns: The depth of this format
**/
GdkMemoryDepth
gdk_memory_format_get_depth (GdkMemoryFormat format)
{
return memory_formats[format].depth;
}
/*<private>
* gdk_memory_depth_merge:
* @depth1: the first depth
* @depth2: the second depth
*
* Returns a depth that can accomodate both given depths
* without any loss of precision.
*
* Returns: The merged depth
**/
GdkMemoryDepth
gdk_memory_depth_merge (GdkMemoryDepth depth1,
GdkMemoryDepth depth2)
{
switch (depth1)
{
case GDK_MEMORY_U8:
return depth2;
case GDK_MEMORY_FLOAT32:
return GDK_MEMORY_FLOAT32;
case GDK_MEMORY_U16:
case GDK_MEMORY_FLOAT16:
if (depth2 == depth1 || depth2 == GDK_MEMORY_U8)
return depth1;
else
return GDK_MEMORY_FLOAT32;
default:
g_assert_not_reached ();
return GDK_MEMORY_U8;
}
}
/*
* gdk_memory_depth_get_alpha_format:
* @depth: the depth
*
* Gets the preferred format to use for rendering masks and other
* alpha-only content.
*
* Returns: the format
**/
GdkMemoryFormat
gdk_memory_depth_get_alpha_format (GdkMemoryDepth depth)
{
switch (depth)
{
case GDK_MEMORY_U8:
return GDK_MEMORY_A8;
case GDK_MEMORY_U16:
return GDK_MEMORY_A16;
case GDK_MEMORY_FLOAT16:
return GDK_MEMORY_A16_FLOAT;
case GDK_MEMORY_FLOAT32:
return GDK_MEMORY_A32_FLOAT;
default:
g_return_val_if_reached (GDK_MEMORY_A8);
}
}
gboolean
gdk_memory_format_gl_format (GdkMemoryFormat format,
gboolean gles,
guint gl_major,
guint gl_minor,
guint *out_internal_format,
guint *out_format,
guint *out_type,
GLint (*out_swizzle)[4])
{
*out_internal_format = memory_formats[format].gl.internal_format;
*out_format = memory_formats[format].gl.format;
*out_type = memory_formats[format].gl.type;
memcpy (out_swizzle, &memory_formats[format].gl.swizzle, sizeof(GLint) * 4);
if (gles)
{
if (memory_formats[format].min_gl_version.gles_major > gl_major ||
(memory_formats[format].min_gl_version.gles_major == gl_major &&
memory_formats[format].min_gl_version.gles_minor > gl_minor))
return FALSE;
}
else
{
if (memory_formats[format].min_gl_version.gl_major > gl_major ||
(memory_formats[format].min_gl_version.gl_major == gl_major &&
memory_formats[format].min_gl_version.gl_minor > gl_minor))
return FALSE;
}
return TRUE;
}
static void
premultiply (float *rgba,
gsize n)
{
for (gsize i = 0; i < n; i++)
{
rgba[0] *= rgba[3];
rgba[1] *= rgba[3];
rgba[2] *= rgba[3];
rgba += 4;
}
}
static void
unpremultiply (float *rgba,
gsize n)
{
for (gsize i = 0; i < n; i++)
{
if (rgba[3] > 1/255.0)
{
rgba[0] /= rgba[3];
rgba[1] /= rgba[3];
rgba[2] /= rgba[3];
}
rgba += 4;
}
}
void
gdk_memory_convert (guchar *dest_data,
gsize dest_stride,
GdkMemoryFormat dest_format,
const guchar *src_data,
gsize src_stride,
GdkMemoryFormat src_format,
gsize width,
gsize height)
{
const GdkMemoryFormatDescription *dest_desc = &memory_formats[dest_format];
const GdkMemoryFormatDescription *src_desc = &memory_formats[src_format];
float *tmp;
gsize y;
void (*func) (guchar *, const guchar *, gsize) = NULL;
g_assert (dest_format < GDK_MEMORY_N_FORMATS);
g_assert (src_format < GDK_MEMORY_N_FORMATS);
if (src_format == dest_format)
{
gsize bytes_per_row = src_desc->bytes_per_pixel * width;
if (bytes_per_row == src_stride && bytes_per_row == dest_stride)
{
memcpy (dest_data, src_data, bytes_per_row * height);
}
else
{
for (y = 0; y < height; y++)
{
memcpy (dest_data, src_data, bytes_per_row);
src_data += src_stride;
dest_data += dest_stride;
}
}
return;
}
if (src_format == GDK_MEMORY_R8G8B8A8 && dest_format == GDK_MEMORY_R8G8B8A8_PREMULTIPLIED)
func = r8g8b8a8_to_r8g8b8a8_premultiplied;
else if (src_format == GDK_MEMORY_B8G8R8A8 && dest_format == GDK_MEMORY_R8G8B8A8_PREMULTIPLIED)
func = r8g8b8a8_to_b8g8r8a8_premultiplied;
else if (src_format == GDK_MEMORY_R8G8B8A8 && dest_format == GDK_MEMORY_B8G8R8A8_PREMULTIPLIED)
func = r8g8b8a8_to_b8g8r8a8_premultiplied;
else if (src_format == GDK_MEMORY_B8G8R8A8 && dest_format == GDK_MEMORY_B8G8R8A8_PREMULTIPLIED)
func = r8g8b8a8_to_r8g8b8a8_premultiplied;
else if (src_format == GDK_MEMORY_R8G8B8A8 && dest_format == GDK_MEMORY_A8R8G8B8_PREMULTIPLIED)
func = r8g8b8a8_to_a8r8g8b8_premultiplied;
else if (src_format == GDK_MEMORY_B8G8R8A8 && dest_format == GDK_MEMORY_A8R8G8B8_PREMULTIPLIED)
func = r8g8b8a8_to_a8b8g8r8_premultiplied;
else if (src_format == GDK_MEMORY_R8G8B8 && dest_format == GDK_MEMORY_R8G8B8A8_PREMULTIPLIED)
func = r8g8b8_to_r8g8b8a8;
else if (src_format == GDK_MEMORY_B8G8R8 && dest_format == GDK_MEMORY_R8G8B8A8_PREMULTIPLIED)
func = r8g8b8_to_b8g8r8a8;
else if (src_format == GDK_MEMORY_R8G8B8 && dest_format == GDK_MEMORY_B8G8R8A8_PREMULTIPLIED)
func = r8g8b8_to_b8g8r8a8;
else if (src_format == GDK_MEMORY_B8G8R8 && dest_format == GDK_MEMORY_B8G8R8A8_PREMULTIPLIED)
func = r8g8b8_to_r8g8b8a8;
else if (src_format == GDK_MEMORY_R8G8B8 && dest_format == GDK_MEMORY_A8R8G8B8_PREMULTIPLIED)
func = r8g8b8_to_a8r8g8b8;
else if (src_format == GDK_MEMORY_B8G8R8 && dest_format == GDK_MEMORY_A8R8G8B8_PREMULTIPLIED)
func = r8g8b8_to_a8b8g8r8;
else if (src_format == GDK_MEMORY_R8G8B8 && dest_format == GDK_MEMORY_R8G8B8A8)
func = r8g8b8_to_r8g8b8a8;
else if (src_format == GDK_MEMORY_B8G8R8 && dest_format == GDK_MEMORY_R8G8B8A8)
func = r8g8b8_to_b8g8r8a8;
else if (src_format == GDK_MEMORY_R8G8B8 && dest_format == GDK_MEMORY_B8G8R8A8)
func = r8g8b8_to_b8g8r8a8;
else if (src_format == GDK_MEMORY_B8G8R8 && dest_format == GDK_MEMORY_B8G8R8A8)
func = r8g8b8_to_r8g8b8a8;
else if (src_format == GDK_MEMORY_R8G8B8 && dest_format == GDK_MEMORY_A8R8G8B8)
func = r8g8b8_to_a8r8g8b8;
else if (src_format == GDK_MEMORY_B8G8R8 && dest_format == GDK_MEMORY_A8R8G8B8)
func = r8g8b8_to_a8b8g8r8;
if (func != NULL)
{
for (y = 0; y < height; y++)
{
func (dest_data, src_data, width);
src_data += src_stride;
dest_data += dest_stride;
}
return;
}
tmp = g_new (float, width * 4);
for (y = 0; y < height; y++)
{
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);
}
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