Function astcenc_compress_image

Source/astcenc_entry.cpp:1113–1228

See header for documentation. */

/* See header for documentation. */
astcenc_error astcenc_compress_image(
	astcenc_context* ctxo,
	astcenc_image* imagep,
	const astcenc_swizzle* swizzle,
	uint8_t* data_out,
	size_t data_len,
	unsigned int thread_index
) {
#if defined(ASTCENC_DECOMPRESS_ONLY)
	(void)ctxo;
	(void)imagep;
	(void)swizzle;
	(void)data_out;
	(void)data_len;
	(void)thread_index;
	return ASTCENC_ERR_BAD_CONTEXT;
#else
	astcenc_contexti* ctx = &ctxo->context;
	astcenc_error status;
	astcenc_image& image = *imagep;

	if (ctx->config.flags & ASTCENC_FLG_DECOMPRESS_ONLY)
	{
		return ASTCENC_ERR_BAD_CONTEXT;
	}

	status = validate_compression_swizzle(*swizzle);
	if (status != ASTCENC_SUCCESS)
	{
		return status;
	}

	if (thread_index >= ctx->thread_count)
	{
		return ASTCENC_ERR_BAD_PARAM;
	}

	size_t dim_x = image.dim_x;
	size_t dim_y = image.dim_y;
	size_t dim_z = image.dim_z;

	size_t texel_count = get_texels_count(dim_x, dim_y, dim_z);
	// Cumulative texel sizes would overflow a size_t
	if (texel_count == 0)
	{
		return ASTCENC_ERR_BAD_PARAM;
	}

	size_t block_x = ctx->config.block_x;
	size_t block_y = ctx->config.block_y;
	size_t block_z = ctx->config.block_z;

	size_t blocks_x = astc::get_block_count_safe(dim_x, block_x);
	size_t blocks_y = astc::get_block_count_safe(dim_y, block_y);
	size_t blocks_z = astc::get_block_count_safe(dim_z, block_z);

	size_t block_count = get_blocks_count(blocks_x, blocks_y, blocks_z);
	// Cumulative block sizes would overflow a size_t