#include <stddef.h>
#include <stdint.h>
#include "libavutil/attributes.h"
#include "libavutil/common.h"
#include "libavutil/intreadwrite.h"
#include "texturedsp.h"

Macros
#define	mul8(a, b) (((a) * (b) + 128 + (((a) * (b) + 128) >> 8)) >> 8)

#define	rgb2rgb565(r, g, b) ((mul8(r, 31) << 11) \| (mul8(g, 63) << 5) \| (mul8(b, 31) << 0))

#define	lerp13(a, b) ((2 * (a) + (b)) / 3)

Functions
static void	lerp13rgb (uint8_t out, uint8_t p1, uint8_t *p2)

static void	rgb5652rgb (uint8_t *out, uint16_t v)

static unsigned int	match_colors (const uint8_t *block, ptrdiff_t stride, uint16_t c0, uint16_t c1)

static void	optimize_colors (const uint8_t block, ptrdiff_t stride, uint16_t pmax16, uint16_t *pmin16)

static int	refine_colors (const uint8_t block, ptrdiff_t stride, uint16_t pmax16, uint16_t *pmin16, uint32_t mask)

static int	constant_color (const uint8_t *block, ptrdiff_t stride)

static void	compress_color (uint8_t dst, ptrdiff_t stride, const uint8_t block)

static void	compress_alpha (uint8_t dst, ptrdiff_t stride, const uint8_t block)

static void	rgba2ycocg (uint8_t dst, const uint8_t pixel)
	Convert a RGBA buffer to unscaled YCoCg. More...

static int	dxt1_block (uint8_t dst, ptrdiff_t stride, const uint8_t block)
	Compress one block of RGBA pixels in a DXT1 texture and store the resulting bytes in 'dst'. More...

static int	dxt5_block (uint8_t dst, ptrdiff_t stride, const uint8_t block)
	Compress one block of RGBA pixels in a DXT5 texture and store the resulting bytes in 'dst'. More...

static int	dxt5ys_block (uint8_t dst, ptrdiff_t stride, const uint8_t block)
	Compress one block of RGBA pixels in a DXT5-YCoCg texture and store the resulting bytes in 'dst'. More...

static int	rgtc1u_alpha_block (uint8_t dst, ptrdiff_t stride, const uint8_t block)
	Compress one block of RGBA pixels in a RGTC1U texture and store the resulting bytes in 'dst'. More...

av_cold void	ff_texturedspenc_init (TextureDSPContext *c)

Variables
static const uint8_t	expand5 [32]

static const uint8_t	expand6 [64]

static const uint8_t	match5 [256][2]

static const uint8_t	match6 [256][2]

Macro Definition Documentation

◆ mul8

#define mul8	(	a,
		b
	)	(((a) * (b) + 128 + (((a) * (b) + 128) >> 8)) >> 8)

Definition at line 143 of file texturedspenc.c.

◆ rgb2rgb565

#define rgb2rgb565	(	r,
		g,
		b
	)	((mul8(r, 31) << 11) \| (mul8(g, 63) << 5) \| (mul8(b, 31) << 0))

Definition at line 146 of file texturedspenc.c.

◆ lerp13

#define lerp13	(	a,
		b
	)	((2 * (a) + (b)) / 3)

Definition at line 150 of file texturedspenc.c.

Function Documentation

◆ lerp13rgb()

static void lerp13rgb	(	uint8_t *	out,
		uint8_t *	p1,
		uint8_t *	p2
	)

inlinestatic

Definition at line 153 of file texturedspenc.c.

Referenced by match_colors().

◆ rgb5652rgb()

static void rgb5652rgb	(	uint8_t *	out,
		uint16_t	v
	)

inlinestatic

Definition at line 161 of file texturedspenc.c.

Referenced by match_colors().

◆ match_colors()

static unsigned int match_colors	(	const uint8_t *	block,
		ptrdiff_t	stride,
		uint16_t	c0,
		uint16_t	c1
	)

static

Definition at line 174 of file texturedspenc.c.

Referenced by compress_color().

◆ optimize_colors()

static void optimize_colors	(	const uint8_t *	block,
		ptrdiff_t	stride,
		uint16_t *	pmax16,
		uint16_t *	pmin16
	)

static

Definition at line 237 of file texturedspenc.c.

Referenced by compress_color().

◆ refine_colors()

static int refine_colors	(	const uint8_t *	block,
		ptrdiff_t	stride,
		uint16_t *	pmax16,
		uint16_t *	pmin16,
		uint32_t	mask
	)

static

Definition at line 350 of file texturedspenc.c.

Referenced by compress_color().

◆ constant_color()

static int constant_color	(	const uint8_t *	block,
		ptrdiff_t	stride
	)

static

Definition at line 440 of file texturedspenc.c.

Referenced by compress_color().

◆ compress_color()

static void compress_color	(	uint8_t *	dst,
		ptrdiff_t	stride,
		const uint8_t *	block
	)

static

Definition at line 453 of file texturedspenc.c.

Referenced by dxt1_block(), dxt5_block(), and dxt5ys_block().

◆ compress_alpha()

static void compress_alpha	(	uint8_t *	dst,
		ptrdiff_t	stride,
		const uint8_t *	block
	)

static

Definition at line 499 of file texturedspenc.c.

Referenced by dxt5_block(), dxt5ys_block(), and rgtc1u_alpha_block().

◆ rgba2ycocg()

static void rgba2ycocg	(	uint8_t *	dst,
		const uint8_t *	pixel
	)

static

Convert a RGBA buffer to unscaled YCoCg.

Scale is usually introduced to avoid banding over a certain range of colors, but this version of the algorithm does not introduce it as much as other implementations, allowing for a simpler and faster conversion.

Definition at line 579 of file texturedspenc.c.

Referenced by dxt5ys_block().

◆ dxt1_block()

static int dxt1_block	(	uint8_t *	dst,
		ptrdiff_t	stride,
		const uint8_t *	block
	)

static

Compress one block of RGBA pixels in a DXT1 texture and store the resulting bytes in 'dst'.

Alpha is not preserved.

Parameters

dst	output buffer.
stride	scanline in bytes.
block	block to compress.

Returns: how much texture data has been written.

Definition at line 601 of file texturedspenc.c.

Referenced by ff_texturedspenc_init().

◆ dxt5_block()

static int dxt5_block	(	uint8_t *	dst,
		ptrdiff_t	stride,
		const uint8_t *	block
	)

static

Compress one block of RGBA pixels in a DXT5 texture and store the resulting bytes in 'dst'.

Alpha is preserved.

Parameters

dst	output buffer.
stride	scanline in bytes.
block	block to compress.

Returns: how much texture data has been written.

Definition at line 617 of file texturedspenc.c.

Referenced by ff_texturedspenc_init().

◆ dxt5ys_block()

static int dxt5ys_block	(	uint8_t *	dst,
		ptrdiff_t	stride,
		const uint8_t *	block
	)

static

Compress one block of RGBA pixels in a DXT5-YCoCg texture and store the resulting bytes in 'dst'.

Alpha is not preserved.

Parameters

dst	output buffer.
stride	scanline in bytes.
block	block to compress.

Returns: how much texture data has been written.

Definition at line 634 of file texturedspenc.c.

Referenced by ff_texturedspenc_init().

◆ rgtc1u_alpha_block()

static int rgtc1u_alpha_block	(	uint8_t *	dst,
		ptrdiff_t	stride,
		const uint8_t *	block
	)

static

Compress one block of RGBA pixels in a RGTC1U texture and store the resulting bytes in 'dst'.

Use the alpha channel of the input image.

Parameters

dst	output buffer.
stride	scanline in bytes.
block	block to compress.

Returns: how much texture data has been written.

Definition at line 659 of file texturedspenc.c.

Referenced by ff_texturedspenc_init().

◆ ff_texturedspenc_init()

av_cold void ff_texturedspenc_init ( TextureDSPContext * c )

Definition at line 666 of file texturedspenc.c.

Referenced by hap_init().

Variable Documentation

◆ expand5

const uint8_t expand5[32]

static

Initial value:

= {
      0,   8,  16,  24,  33,  41,  49,  57,  66,  74,  82,  90,
     99, 107, 115, 123, 132, 140, 148, 156, 165, 173, 181, 189,
    198, 206, 214, 222, 231, 239, 247, 255,
}

Definition at line 35 of file texturedspenc.c.

Referenced by rgb5652rgb().

◆ expand6

const uint8_t expand6[64]

static

Initial value:

= {
      0,   4,   8,  12,  16,  20,  24,  28,  32,  36,  40,  44,
     48,  52,  56,  60,  65,  69,  73,  77,  81,  85,  89,  93,
     97, 101, 105, 109, 113, 117, 121, 125, 130, 134, 138, 142,
    146, 150, 154, 158, 162, 166, 170, 174, 178, 182, 186, 190,
    195, 199, 203, 207, 211, 215, 219, 223, 227, 231, 235, 239,
    243, 247, 251, 255,
}

Definition at line 41 of file texturedspenc.c.

Referenced by rgb5652rgb().

◆ match5

const uint8_t match5[256][2]

static

Definition at line 50 of file texturedspenc.c.

Referenced by compress_color(), and refine_colors().

◆ match6

const uint8_t match6[256][2]

static

Definition at line 96 of file texturedspenc.c.

Referenced by compress_color(), and refine_colors().

Macros

Functions

Variables

Macro Definition Documentation

◆ mul8

◆ rgb2rgb565

◆ lerp13

Function Documentation

◆ lerp13rgb()

◆ rgb5652rgb()

◆ match_colors()

◆ optimize_colors()

◆ refine_colors()

◆ constant_color()

◆ compress_color()

◆ compress_alpha()

◆ rgba2ycocg()

◆ dxt1_block()

◆ dxt5_block()

◆ dxt5ys_block()

◆ rgtc1u_alpha_block()

◆ ff_texturedspenc_init()

Variable Documentation

◆ expand5

◆ expand6

◆ match5

◆ match6