/**
 * FreeRDP: A Remote Desktop Protocol Implementation
 * RemoteFX Codec Library - Encode
 *
 * Copyright 2011 Vic Lee
 * Copyright 2011 Norbert Federa <nfedera@thinstuff.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <winpr/crt.h>
#include <winpr/collections.h>

#include <freerdp/primitives.h>

#include "rfx_types.h"
#include "rfx_rlgr.h"
#include "rfx_differential.h"
#include "rfx_quantization.h"
#include "rfx_dwt.h"

#include "rfx_encode.h"

#define MINMAX(_v,_l,_h) ((_v) < (_l) ? (_l) : ((_v) > (_h) ? (_h) : (_v)))

static void rfx_encode_format_rgb(const BYTE* rgb_data, int width, int height, int rowstride,
	RDP_PIXEL_FORMAT pixel_format, const BYTE* palette, INT16* r_buf, INT16* g_buf, INT16* b_buf)
{
	int x, y;
	int x_exceed;
	int y_exceed;
	const BYTE* src;
	INT16 r, g, b;
	INT16 *r_last, *g_last, *b_last;

	x_exceed = 64 - width;
	y_exceed = 64 - height;

	for (y = 0; y < height; y++)
	{
		src = rgb_data + y * rowstride;

		switch (pixel_format)
		{
			case RDP_PIXEL_FORMAT_B8G8R8A8:
				for (x = 0; x < width; x++)
				{
					*b_buf++ = (INT16) (*src++);
					*g_buf++ = (INT16) (*src++);
					*r_buf++ = (INT16) (*src++);
					src++;
				}
				break;
			case RDP_PIXEL_FORMAT_R8G8B8A8:
				for (x = 0; x < width; x++)
				{
					*r_buf++ = (INT16) (*src++);
					*g_buf++ = (INT16) (*src++);
					*b_buf++ = (INT16) (*src++);
					src++;
				}
				break;
			case RDP_PIXEL_FORMAT_B8G8R8:
				for (x = 0; x < width; x++)
				{
					*b_buf++ = (INT16) (*src++);
					*g_buf++ = (INT16) (*src++);
					*r_buf++ = (INT16) (*src++);
				}
				break;
			case RDP_PIXEL_FORMAT_R8G8B8:
				for (x = 0; x < width; x++)
				{
					*r_buf++ = (INT16) (*src++);
					*g_buf++ = (INT16) (*src++);
					*b_buf++ = (INT16) (*src++);
				}
				break;
			case RDP_PIXEL_FORMAT_B5G6R5_LE:
				for (x = 0; x < width; x++)
				{
					*b_buf++ = (INT16) (((*(src + 1)) & 0xF8) | ((*(src + 1)) >> 5));
					*g_buf++ = (INT16) ((((*(src + 1)) & 0x07) << 5) | (((*src) & 0xE0) >> 3));
					*r_buf++ = (INT16) ((((*src) & 0x1F) << 3) | (((*src) >> 2) & 0x07));
					src += 2;
				}
				break;
			case RDP_PIXEL_FORMAT_R5G6B5_LE:
				for (x = 0; x < width; x++)
				{
					*r_buf++ = (INT16) (((*(src + 1)) & 0xF8) | ((*(src + 1)) >> 5));
					*g_buf++ = (INT16) ((((*(src + 1)) & 0x07) << 5) | (((*src) & 0xE0) >> 3));
					*b_buf++ = (INT16) ((((*src) & 0x1F) << 3) | (((*src) >> 2) & 0x07));
					src += 2;
				}
				break;
			case RDP_PIXEL_FORMAT_P4_PLANER:
				if (!palette)
					break;
				for (x = 0; x < width; x++)
				{
					int shift;
					BYTE idx;

					shift = (7 - (x % 8));
					idx = ((*src) >> shift) & 1;
					idx |= (((*(src + 1)) >> shift) & 1) << 1;
					idx |= (((*(src + 2)) >> shift) & 1) << 2;
					idx |= (((*(src + 3)) >> shift) & 1) << 3;
					idx *= 3;
					*r_buf++ = (INT16) palette[idx];
					*g_buf++ = (INT16) palette[idx + 1];
					*b_buf++ = (INT16) palette[idx + 2];
					if (shift == 0)
						src += 4;
				}
				break;
			case RDP_PIXEL_FORMAT_P8:
				if (!palette)
					break;
				for (x = 0; x < width; x++)
				{
					int idx = (*src) * 3;

					*r_buf++ = (INT16) palette[idx];
					*g_buf++ = (INT16) palette[idx + 1];
					*b_buf++ = (INT16) palette[idx + 2];
					src++;
				}
				break;
			default:
				break;
		}
		/* Fill the horizontal region outside of 64x64 tile size with the right-most pixel for best quality */
		if (x_exceed > 0)
		{
			r = *(r_buf - 1);
			g = *(g_buf - 1);
			b = *(b_buf - 1);

			for (x = 0; x < x_exceed; x++)
			{
				*r_buf++ = r;
				*g_buf++ = g;
				*b_buf++ = b;
			}
		}
	}

	/* Fill the vertical region outside of 64x64 tile size with the last line. */
	if (y_exceed > 0)
	{
		r_last = r_buf - 64;
		g_last = g_buf - 64;
		b_last = b_buf - 64;

		while (y_exceed > 0)
		{
			memcpy(r_buf, r_last, 64 * sizeof(INT16));
			memcpy(g_buf, g_last, 64 * sizeof(INT16));
			memcpy(b_buf, b_last, 64 * sizeof(INT16));
			r_buf += 64;
			g_buf += 64;
			b_buf += 64;
			y_exceed--;
		}
	}
}

/* rfx_encode_rgb_to_ycbcr code now resides in the primitives library. */

static void rfx_encode_component(RFX_CONTEXT* context, const UINT32* quantization_values,
	INT16* data, BYTE* buffer, int buffer_size, int* size)
{
	INT16* dwt_buffer;

	dwt_buffer = BufferPool_Take(context->priv->BufferPool, -1); /* dwt_buffer */

	PROFILER_ENTER(context->priv->prof_rfx_encode_component);

	PROFILER_ENTER(context->priv->prof_rfx_dwt_2d_encode);
		context->dwt_2d_encode(data, dwt_buffer);
	PROFILER_EXIT(context->priv->prof_rfx_dwt_2d_encode);

	PROFILER_ENTER(context->priv->prof_rfx_quantization_encode);
		context->quantization_encode(data, quantization_values);
	PROFILER_EXIT(context->priv->prof_rfx_quantization_encode);

	PROFILER_ENTER(context->priv->prof_rfx_differential_encode);
		rfx_differential_encode(data + 4032, 64);
	PROFILER_EXIT(context->priv->prof_rfx_differential_encode);

	PROFILER_ENTER(context->priv->prof_rfx_rlgr_encode);
		*size = rfx_rlgr_encode(context->mode, data, 4096, buffer, buffer_size);
	PROFILER_EXIT(context->priv->prof_rfx_rlgr_encode);

	PROFILER_EXIT(context->priv->prof_rfx_encode_component);

	BufferPool_Return(context->priv->BufferPool, dwt_buffer);
}

void rfx_encode_rgb(RFX_CONTEXT* context, const BYTE* rgb_data, int width, int height, int rowstride,
	const UINT32* y_quants, const UINT32* cb_quants, const UINT32* cr_quants,
	wStream* data_out, int* y_size, int* cb_size, int* cr_size)
{
	INT16* pSrcDst[3];
	primitives_t* prims = primitives_get();
	static const prim_size_t roi_64x64 = { 64, 64 };

	pSrcDst[0] = (INT16*)((BYTE*)BufferPool_Take(context->priv->BufferPool, -1) + 16); /* y_r_buffer */
	pSrcDst[1] = (INT16*)((BYTE*)BufferPool_Take(context->priv->BufferPool, -1) + 16); /* cb_g_buffer */
	pSrcDst[2] = (INT16*)((BYTE*)BufferPool_Take(context->priv->BufferPool, -1) + 16); /* cr_b_buffer */

	PROFILER_ENTER(context->priv->prof_rfx_encode_rgb);

	PROFILER_ENTER(context->priv->prof_rfx_encode_format_rgb);
		rfx_encode_format_rgb(rgb_data, width, height, rowstride,
			context->pixel_format, context->palette, pSrcDst[0], pSrcDst[1], pSrcDst[2]);
	PROFILER_EXIT(context->priv->prof_rfx_encode_format_rgb);

	PROFILER_ENTER(context->priv->prof_rfx_rgb_to_ycbcr);
		prims->RGBToYCbCr_16s16s_P3P3((const INT16**) pSrcDst, 64 * sizeof(INT16),
			pSrcDst, 64 * sizeof(INT16), &roi_64x64);
	PROFILER_EXIT(context->priv->prof_rfx_rgb_to_ycbcr);

	/* Ensure the buffer is reasonably large enough */
	Stream_EnsureRemainingCapacity(data_out, 4096);

	rfx_encode_component(context, y_quants, pSrcDst[0],
		Stream_Pointer(data_out), Stream_GetRemainingLength(data_out), y_size);
	Stream_Seek(data_out, *y_size);

	Stream_EnsureRemainingCapacity(data_out, 4096);
	rfx_encode_component(context, cb_quants, pSrcDst[1],
		Stream_Pointer(data_out), Stream_GetRemainingLength(data_out), cb_size);
	Stream_Seek(data_out, *cb_size);

	Stream_EnsureRemainingCapacity(data_out, 4096);
	rfx_encode_component(context, cr_quants, pSrcDst[2],
		Stream_Pointer(data_out), Stream_GetRemainingLength(data_out), cr_size);
	Stream_Seek(data_out, *cr_size);

	PROFILER_EXIT(context->priv->prof_rfx_encode_rgb);

	BufferPool_Return(context->priv->BufferPool, (BYTE*)pSrcDst[0] - 16);
	BufferPool_Return(context->priv->BufferPool, (BYTE*)pSrcDst[1] - 16);
	BufferPool_Return(context->priv->BufferPool, (BYTE*)pSrcDst[2] - 16);
}