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gdk: Add a fast-path

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Special case u8 RGBA8p, which is the common case.
This commit is contained in:
Matthias Clasen
2024-06-19 19:49:37 -04:00
committed by Benjamin Otte
parent ab7d969700
commit 2879d35f3d
1 changed files with 158 additions and 0 deletions
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158
gdk/gdkmemoryformat.c
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@@ -1951,6 +1951,149 @@ gdk_memory_convert (guchar *dest_data,
g_free (tmp);
}
static const guchar srgb_lookup[] = {
0, 12, 21, 28, 33, 38, 42, 46, 49, 52, 55, 58, 61, 63, 66, 68,
70, 73, 75, 77, 79, 81, 82, 84, 86, 88, 89, 91, 93, 94, 96, 97,
99, 100, 102, 103, 104, 106, 107, 109, 110, 111, 112, 114, 115, 116, 117, 118,
120, 121, 122, 123, 124, 125, 126, 127, 129, 130, 131, 132, 133, 134, 135, 136,
137, 138, 139, 140, 141, 142, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151,
151, 152, 153, 154, 155, 156, 157, 157, 158, 159, 160, 161, 161, 162, 163, 164,
165, 165, 166, 167, 168, 168, 169, 170, 171, 171, 172, 173, 174, 174, 175, 176,
176, 177, 178, 179, 179, 180, 181, 181, 182, 183, 183, 184, 185, 185, 186, 187,
187, 188, 189, 189, 190, 191, 191, 192, 193, 193, 194, 194, 195, 196, 196, 197,
197, 198, 199, 199, 200, 201, 201, 202, 202, 203, 204, 204, 205, 205, 206, 206,
207, 208, 208, 209, 209, 210, 210, 211, 212, 212, 213, 213, 214, 214, 215, 215,
216, 217, 217, 218, 218, 219, 219, 220, 220, 221, 221, 222, 222, 223, 223, 224,
224, 225, 226, 226, 227, 227, 228, 228, 229, 229, 230, 230, 231, 231, 232, 232,
233, 233, 234, 234, 235, 235, 236, 236, 237, 237, 237, 238, 238, 239, 239, 240,
240, 241, 241, 242, 242, 243, 243, 244, 244, 245, 245, 245, 246, 246, 247, 247,
248, 248, 249, 249, 250, 250, 251, 251, 251, 252, 252, 253, 253, 254, 254, 255
};
static const guchar srgb_inverse_lookup[] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1,
1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3,
3, 3, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7,
7, 7, 8, 8, 8, 9, 9, 9, 10, 10, 10, 11, 11, 11, 12, 12,
13, 13, 13, 14, 14, 15, 15, 16, 16, 16, 17, 17, 18, 18, 19, 19,
20, 20, 21, 22, 22, 23, 23, 24, 24, 25, 26, 26, 27, 27, 28, 29,
29, 30, 31, 31, 32, 33, 33, 34, 35, 36, 36, 37, 38, 38, 39, 40,
41, 42, 42, 43, 44, 45, 46, 47, 47, 48, 49, 50, 51, 52, 53, 54,
55, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 70,
71, 72, 73, 74, 75, 76, 77, 78, 80, 81, 82, 83, 84, 85, 87, 88,
89, 90, 92, 93, 94, 95, 97, 98, 99, 101, 102, 103, 105, 106, 107, 109,
110, 112, 113, 114, 116, 117, 119, 120, 122, 123, 125, 126, 128, 129, 131, 132,
134, 135, 137, 139, 140, 142, 144, 145, 147, 148, 150, 152, 153, 155, 157, 159,
160, 162, 164, 166, 167, 169, 171, 173, 175, 176, 178, 180, 182, 184, 186, 188,
190, 192, 193, 195, 197, 199, 201, 203, 205, 207, 209, 211, 213, 215, 218, 220,
222, 224, 226, 228, 230, 232, 235, 237, 239, 241, 243, 245, 248, 250, 252, 255
};
static void
convert_srgb_to_srgb_linear (guchar *data,
gsize n)
{
for (gsize i = 0; i < n; i++)
{
guint16 r = data[0];
guint16 g = data[1];
guint16 b = data[2];
guchar a = data[3];
if (a != 0)
{
r = (r * 255 + a / 2) / a;
g = (g * 255 + a / 2) / a;
b = (b * 255 + a / 2) / a;
r = srgb_inverse_lookup[r];
g = srgb_inverse_lookup[g];
b = srgb_inverse_lookup[b];
r = r * a + 127;
g = g * a + 127;
b = b * a + 127;
data[0] = (r + (r >> 8) + 1) >> 8;
data[1] = (g + (g >> 8) + 1) >> 8;
data[2] = (b + (b >> 8) + 1) >> 8;
}
data += 4;
}
}
static void
convert_srgb_linear_to_srgb (guchar *data,
gsize n)
{
for (gsize i = 0; i < n; i++)
{
guint16 r = data[0];
guint16 g = data[1];
guint16 b = data[2];
guchar a = data[3];
if (a != 0)
{
r = (r * 255 + a / 2) / a;
g = (g * 255 + a / 2) / a;
b = (b * 255 + a / 2) / a;
r = srgb_lookup[r];
g = srgb_lookup[g];
b = srgb_lookup[b];
r = r * a + 127;
g = g * a + 127;
b = b * a + 127;
data[0] = (r + (r >> 8) + 1) >> 8;
data[1] = (g + (g >> 8) + 1) >> 8;
data[2] = (b + (b >> 8) + 1) >> 8;
}
data += 4;
}
}
static void
convert_srgb_to_srgb_linear_in_place (guchar *data,
gsize stride,
gsize width,
gsize height)
{
if (stride == width * 4)
{
convert_srgb_to_srgb_linear (data, height * width);
}
else
{
for (gsize y = 0; y < height; y++)
{
convert_srgb_to_srgb_linear (data, width);
data += stride;
}
}
}
static void
convert_srgb_linear_to_srgb_in_place (guchar *data,
gsize stride,
gsize width,
gsize height)
{
if (stride == width * 4)
{
convert_srgb_linear_to_srgb (data, height * width);
}
else
{
for (gsize y = 0; y < height; y++)
{
convert_srgb_linear_to_srgb (data, width);
data += stride;
}
}
}
void
gdk_memory_convert_color_state (guchar *data,
gsize stride,
@@ -1967,6 +2110,21 @@ gdk_memory_convert_color_state (guchar *data,
if (gdk_color_state_equal (src_cs, dest_cs))
return;
if (format == GDK_MEMORY_B8G8R8A8_PREMULTIPLIED &&
src_cs == GDK_COLOR_STATE_SRGB &&
dest_cs == GDK_COLOR_STATE_SRGB_LINEAR)
{
convert_srgb_to_srgb_linear_in_place (data, stride, width, height);
return;
}
else if (format == GDK_MEMORY_B8G8R8A8_PREMULTIPLIED &&
src_cs == GDK_COLOR_STATE_SRGB_LINEAR &&
dest_cs == GDK_COLOR_STATE_SRGB)
{
convert_srgb_linear_to_srgb_in_place (data, stride, width, height);
return;
}
convert_func = gdk_color_state_get_convert_to (src_cs, dest_cs);
/* FIXME: add fallback that goes via generic colorstate */
g_assert (convert_func);