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cogl/bitmap-conversion: Use enum for medium type

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The type of the intermediate medium for storing pixel channels is
changed from "is 8 or 16 bit" to an enum, and switch cases. This doesn't
add support for anything, but will make adding a "float" medium type
less intrusive.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3441>
This commit is contained in:
Jonas Ådahl 2022-10-11 11:03:59 +02:00 committed by Sebastian Wick
parent 64f4415f28
commit 68788d0e75
1 changed files with 62 additions and 23 deletions
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77
cogl/cogl/cogl-bitmap-conversion.c
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@ -37,6 +37,12 @@
#include <string.h>
typedef enum
{
MEDIUM_TYPE_8,
MEDIUM_TYPE_16,
} MediumType;
#define component_type uint8_t
#define component_size 8
/* We want to specially optimise the packing when we are converting
@ -306,7 +312,7 @@ _cogl_bitmap_can_fast_premult (CoglPixelFormat format)
}
static gboolean
_cogl_bitmap_needs_short_temp_buffer (CoglPixelFormat format)
determine_medium_size (CoglPixelFormat format)
{
/* If the format is using more than 8 bits per component then we'll
unpack into a 16-bit per component buffer instead of 8-bit so we
@ -346,7 +352,7 @@ _cogl_bitmap_needs_short_temp_buffer (CoglPixelFormat format)
case COGL_PIXEL_FORMAT_ABGR_8888_PRE:
case COGL_PIXEL_FORMAT_RGBA_4444_PRE:
case COGL_PIXEL_FORMAT_RGBA_5551_PRE:
return FALSE;
return MEDIUM_TYPE_8;
case COGL_PIXEL_FORMAT_RGBA_1010102:
case COGL_PIXEL_FORMAT_BGRA_1010102:
@ -370,13 +376,27 @@ _cogl_bitmap_needs_short_temp_buffer (CoglPixelFormat format)
case COGL_PIXEL_FORMAT_BGRA_FP_16161616_PRE:
case COGL_PIXEL_FORMAT_ARGB_FP_16161616_PRE:
case COGL_PIXEL_FORMAT_ABGR_FP_16161616_PRE:
return TRUE;
return MEDIUM_TYPE_16;
}
g_assert_not_reached ();
return FALSE;
}
static size_t
calculate_medium_size_pixel_size (MediumType medium_type)
{
switch (medium_type)
{
case MEDIUM_TYPE_8:
return sizeof (uint8_t) * 4;
case MEDIUM_TYPE_16:
return sizeof (uint16_t) * 4;
}
g_assert_not_reached ();
}
gboolean
_cogl_bitmap_convert_into_bitmap (CoglBitmap *src_bmp,
CoglBitmap *dst_bmp,
@ -393,7 +413,7 @@ _cogl_bitmap_convert_into_bitmap (CoglBitmap *src_bmp,
int width, height;
CoglPixelFormat src_format;
CoglPixelFormat dst_format;
gboolean use_16;
MediumType medium_type;
gboolean need_premult;
src_format = cogl_bitmap_get_format (src_bmp);
@ -454,11 +474,10 @@ _cogl_bitmap_convert_into_bitmap (CoglBitmap *src_bmp,
return FALSE;
}
use_16 = _cogl_bitmap_needs_short_temp_buffer (dst_format);
medium_type = determine_medium_size (dst_format);
/* Allocate a buffer to hold a temporary RGBA row */
tmp_row = g_malloc (width *
(use_16 ? sizeof (uint16_t) : sizeof (uint8_t)) * 4);
tmp_row = g_malloc (width * calculate_medium_size_pixel_size (medium_type));
/* FIXME: Optimize */
for (y = 0; y < height; y++)
@ -466,34 +485,54 @@ _cogl_bitmap_convert_into_bitmap (CoglBitmap *src_bmp,
src = src_data + y * src_rowstride;
dst = dst_data + y * dst_rowstride;
if (use_16)
_cogl_unpack_16 (src_format, src, tmp_row, width);
else
switch (medium_type)
{
case MEDIUM_TYPE_8:
_cogl_unpack_8 (src_format, src, tmp_row, width);
break;
case MEDIUM_TYPE_16:
_cogl_unpack_16 (src_format, src, tmp_row, width);
break;
}
/* Handle premultiplication */
if (need_premult)
{
if (dst_format & COGL_PREMULT_BIT)
{
if (use_16)
_cogl_bitmap_premult_unpacked_span_16 (tmp_row, width);
else
switch (medium_type)
{
case MEDIUM_TYPE_8:
_cogl_bitmap_premult_unpacked_span_8 (tmp_row, width);
break;
case MEDIUM_TYPE_16:
_cogl_bitmap_premult_unpacked_span_16 (tmp_row, width);
break;
}
}
else
{
if (use_16)
_cogl_bitmap_unpremult_unpacked_span_16 (tmp_row, width);
else
switch (medium_type)
{
case MEDIUM_TYPE_8:
_cogl_bitmap_unpremult_unpacked_span_8 (tmp_row, width);
break;
case MEDIUM_TYPE_16:
_cogl_bitmap_unpremult_unpacked_span_16 (tmp_row, width);
break;
}
}
}
if (use_16)
_cogl_pack_16 (dst_format, tmp_row, dst, width);
else
switch (medium_type)
{
case MEDIUM_TYPE_8:
_cogl_pack_8 (dst_format, tmp_row, dst, width);
break;
case MEDIUM_TYPE_16:
_cogl_pack_16 (dst_format, tmp_row, dst, width);
break;
}
}
_cogl_bitmap_unmap (src_bmp);