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 Copyright 2000 Intel Corporation.  All Rights Reserved.

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 without limitation the rights to use, copy, modify, merge, publish,
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 the following conditions:

 The above copyright notice and this permission notice (including the
 next paragraph) shall be included in all copies or substantial portions
 of the Software.

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 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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/*
 * i830_video.c: i830/i845 Xv driver.
 *
 * Copyright © 2002 by Alan Hourihane and David Dawes
 *
 * Authors:
 *	Alan Hourihane <alanh@tungstengraphics.com>
 *	David Dawes <dawes@xfree86.org>
 *
 * Derived from i810 Xv driver:
 *
 * Authors of i810 code:
 *	Jonathan Bian <jonathan.bian@intel.com>
 *      Offscreen Images:
 *        Matt Sottek <matthew.j.sottek@intel.com>
 */

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

#include <inttypes.h>
#include <math.h>
#include <string.h>
#include <assert.h>
#include <errno.h>

#include <sys/mman.h>

#include "sna.h"
#include "sna_reg.h"
#include "sna_video.h"

#include <xf86xv.h>
#include <X11/extensions/Xv.h>

#ifdef SNA_XVMC
#define _SNA_XVMC_SERVER_
#include "sna_video_hwmc.h"
#else
static inline Bool sna_video_xvmc_setup(struct sna *sna,
					ScreenPtr ptr,
					XF86VideoAdaptorPtr target)
{
	return FALSE;
}
#endif

#if DEBUG_VIDEO_TEXTURED
#undef DBG
#define DBG(x) ErrorF x
#endif

void sna_video_free_buffers(struct sna *sna, struct sna_video *video)
{
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(video->old_buf); i++) {
		if (video->old_buf[i]) {
			kgem_bo_destroy(&sna->kgem, video->old_buf[i]);
			video->old_buf[i] = NULL;
		}
	}

	if (video->buf) {
		kgem_bo_destroy(&sna->kgem, video->buf);
		video->buf = NULL;
	}
}

struct kgem_bo *
sna_video_buffer(struct sna *sna,
		 struct sna_video *video,
		 struct sna_video_frame *frame)
{
	/* Free the current buffer if we're going to have to reallocate */
	if (video->buf && video->buf->size < frame->size)
		sna_video_free_buffers(sna, video);

	if (video->buf == NULL)
		video->buf = kgem_create_linear(&sna->kgem, frame->size);

	return video->buf;
}

void sna_video_buffer_fini(struct sna *sna,
			   struct sna_video *video)
{
	struct kgem_bo *bo;

	bo = video->old_buf[1];
	video->old_buf[1] = video->old_buf[0];
	video->old_buf[0] = video->buf;
	video->buf = bo;
}

Bool
sna_video_clip_helper(ScrnInfoPtr scrn,
		      struct sna_video *video,
		      struct sna_video_frame *frame,
		      xf86CrtcPtr * crtc_ret,
		      BoxPtr dst,
		      short src_x, short src_y,
		      short drw_x, short drw_y,
		      short src_w, short src_h,
		      short drw_w, short drw_h,
		      RegionPtr reg)
{
	Bool ret;
	RegionRec crtc_region_local;
	RegionPtr crtc_region = reg;
	BoxRec crtc_box;
	INT32 x1, x2, y1, y2;
	xf86CrtcPtr crtc;

	x1 = src_x;
	x2 = src_x + src_w;
	y1 = src_y;
	y2 = src_y + src_h;

	dst->x1 = drw_x;
	dst->x2 = drw_x + drw_w;
	dst->y1 = drw_y;
	dst->y2 = drw_y + drw_h;

	/*
	 * For overlay video, compute the relevant CRTC and
	 * clip video to that
	 */
	crtc = sna_covering_crtc(scrn, dst, video->desired_crtc, &crtc_box);

	/* For textured video, we don't actually want to clip at all. */
	if (crtc && !video->textured) {
		RegionInit(&crtc_region_local, &crtc_box, 1);
		crtc_region = &crtc_region_local;
		RegionIntersect(crtc_region, crtc_region, reg);
	}
	*crtc_ret = crtc;

	ret = xf86XVClipVideoHelper(dst, &x1, &x2, &y1, &y2,
				    crtc_region, frame->width, frame->height);
	if (crtc_region != reg)
		RegionUninit(&crtc_region_local);

	frame->top = y1 >> 16;
	frame->left = (x1 >> 16) & ~1;
	frame->npixels = ALIGN(((x2 + 0xffff) >> 16), 2) - frame->left;
	if (is_planar_fourcc(frame->id)) {
		frame->top &= ~1;
		frame->nlines = ALIGN(((y2 + 0xffff) >> 16), 2) - frame->top;
	} else
		frame->nlines = ((y2 + 0xffff) >> 16) - frame->top;

	return ret;
}

void
sna_video_frame_init(struct sna *sna,
		     struct sna_video *video,
		     int id, short width, short height,
		     struct sna_video_frame *frame)
{
	int align;

	frame->id = id;
	frame->width = width;
	frame->height = height;

	/* Only needs to be DWORD-aligned for textured on i915, but overlay has
	 * stricter requirements.
	 */
	if (video->textured) {
		align = 4;
	} else {
		if (sna->kgem.gen >= 40)
			/* Actually the alignment is 64 bytes, too. But the
			 * stride must be at least 512 bytes. Take the easy fix
			 * and align on 512 bytes unconditionally. */
			align = 512;
		else if (sna->kgem.gen < 21)
			/* Harsh, errata on these chipsets limit the stride
			 * to be a multiple of 256 bytes.
			 */
			align = 256;
		else
			align = 64;
	}

#if SNA_XVMC
	/* for i915 xvmc, hw requires 1kb aligned surfaces */
	if (id == FOURCC_XVMC && sna->kgem.gen < 40)
		align = 1024;
#endif


	/* Determine the desired destination pitch (representing the chroma's pitch,
	 * in the planar case.
	 */
	if (is_planar_fourcc(id)) {
		if (video->rotation & (RR_Rotate_90 | RR_Rotate_270)) {
			frame->pitch[0] = ALIGN((height / 2), align);
			frame->pitch[1] = ALIGN(height, align);
			frame->size = frame->pitch[0] * width * 3;
		} else {
			frame->pitch[0] = ALIGN((width / 2), align);
			frame->pitch[1] = ALIGN(width, align);
			frame->size = frame->pitch[0] * height * 3;
		}
	} else {
		if (video->rotation & (RR_Rotate_90 | RR_Rotate_270)) {
			frame->pitch[0] = ALIGN((height << 1), align);
			frame->size = frame->pitch[0] * width;
		} else {
			frame->pitch[0] = ALIGN((width << 1), align);
			frame->size = frame->pitch[0] * height;
		}
		frame->pitch[1] = 0;
	}

	if (video->rotation & (RR_Rotate_90 | RR_Rotate_270)) {
		frame->UBufOffset = frame->pitch[1] * width;
		frame->VBufOffset =
			frame->UBufOffset + frame->pitch[0] * width / 2;
	} else {
		frame->UBufOffset = frame->pitch[1] * height;
		frame->VBufOffset =
			frame->UBufOffset + frame->pitch[0] * height / 2;
	}
}

static void sna_memcpy_plane(uint8_t *dst, const uint8_t *src,
			     int height, int width,
			     int dstPitch, int srcPitch,
			     Rotation rotation)
{
	const uint8_t *s;
	int i, j = 0;

	switch (rotation) {
	case RR_Rotate_0:
		/* optimise for the case of no clipping */
		if (srcPitch == dstPitch && srcPitch == width)
			memcpy(dst, src, srcPitch * height);
		else while (height--) {
			memcpy(dst, src, width);
			src += srcPitch;
			dst += dstPitch;
		}
		break;
	case RR_Rotate_90:
		for (i = 0; i < height; i++) {
			s = src;
			for (j = 0; j < width; j++) {
				dst[(i) + ((width - j - 1) * dstPitch)] = *s++;
			}
			src += srcPitch;
		}
		break;
	case RR_Rotate_180:
		for (i = 0; i < height; i++) {
			s = src;
			for (j = 0; j < width; j++) {
				dst[(width - j - 1) +
				    ((height - i - 1) * dstPitch)] = *s++;
			}
			src += srcPitch;
		}
		break;
	case RR_Rotate_270:
		for (i = 0; i < height; i++) {
			s = src;
			for (j = 0; j < width; j++) {
				dst[(height - i - 1) + (j * dstPitch)] = *s++;
			}
			src += srcPitch;
		}
		break;
	}
}

static void
sna_copy_planar_data(struct sna_video *video,
		     const struct sna_video_frame *frame,
		     const uint8_t *src, uint8_t *dst)
{
	uint8_t *d;
	int w = frame->npixels;
	int h = frame->nlines;
	int pitch;

	pitch = ALIGN(frame->width, 4);
	sna_memcpy_plane(dst, src + frame->top * pitch + frame->left,
			 h, w, frame->pitch[1], pitch, video->rotation);

	src += frame->height * pitch; /* move over Luma plane */

	/* align to beginning of chroma planes */
	pitch = ALIGN((frame->width >> 1), 0x4);
	src += (frame->top >> 1) * pitch + (frame->left >> 1);
	w >>= 1;
	h >>= 1;

	if (frame->id == FOURCC_I420)
		d = dst + frame->UBufOffset;
	else
		d = dst + frame->VBufOffset;

	sna_memcpy_plane(d, src, h, w, frame->pitch[0], pitch, video->rotation);
	src += (frame->height >> 1) * pitch; /* move over Chroma plane */

	if (frame->id == FOURCC_I420)
		d = dst + frame->VBufOffset;
	else
		d = dst + frame->UBufOffset;

	sna_memcpy_plane(d, src, h, w, frame->pitch[0], pitch, video->rotation);
}

static void
sna_copy_packed_data(struct sna_video *video,
		     const struct sna_video_frame *frame,
		     const uint8_t *buf,
		     uint8_t *dst)
{
	int pitch = frame->width << 1;
	const uint8_t *src, *s;
	int w = frame->npixels;
	int h = frame->nlines;
	int i, j;

	src = buf + (frame->top * pitch) + (frame->left << 1);

	switch (video->rotation) {
	case RR_Rotate_0:
		w <<= 1;
		for (i = 0; i < h; i++) {
			memcpy(dst, src, w);
			src += pitch;
			dst += frame->pitch[0];
		}
		break;
	case RR_Rotate_90:
		h <<= 1;
		for (i = 0; i < h; i += 2) {
			s = src;
			for (j = 0; j < w; j++) {
				/* Copy Y */
				dst[(i + 0) + ((w - j - 1) * frame->pitch[0])] = *s;
				s += 2;
			}
			src += pitch;
		}
		h >>= 1;
		src = buf + (frame->top * pitch) + (frame->left << 1);
		for (i = 0; i < h; i += 2) {
			for (j = 0; j < w; j += 2) {
				/* Copy U */
				dst[((i * 2) + 1) + ((w - j - 1) * frame->pitch[0])] = src[(j * 2) + 1 + (i * pitch)];
				dst[((i * 2) + 1) + ((w - j - 2) * frame->pitch[0])] = src[(j * 2) + 1 + ((i + 1) * pitch)];
				/* Copy V */ dst[((i * 2) + 3) + ((w - j - 1) * frame->pitch[0])] = src[(j * 2) + 3 + (i * pitch)];
				dst[((i * 2) + 3) + ((w - j - 2) * frame->pitch[0])] = src[(j * 2) + 3 + ((i + 1) * pitch)];
			}
		}
		break;
	case RR_Rotate_180:
		w <<= 1;
		for (i = 0; i < h; i++) {
			s = src;
			for (j = 0; j < w; j += 4) {
				dst[(w - j - 4) + ((h - i - 1) * frame->pitch[0])] = *s++;
				dst[(w - j - 3) + ((h - i - 1) * frame->pitch[0])] = *s++;
				dst[(w - j - 2) + ((h - i - 1) * frame->pitch[0])] = *s++;
				dst[(w - j - 1) + ((h - i - 1) * frame->pitch[0])] = *s++;
			}
			src += pitch;
		}
		break;
	case RR_Rotate_270:
		h <<= 1;
		for (i = 0; i < h; i += 2) {
			s = src;
			for (j = 0; j < w; j++) {
				/* Copy Y */
				dst[(h - i - 2) + (j * frame->pitch[0])] = *s;
				s += 2;
			}
			src += pitch;
		}
		h >>= 1;
		src = buf + (frame->top * pitch) + (frame->left << 1);
		for (i = 0; i < h; i += 2) {
			for (j = 0; j < w; j += 2) {
				/* Copy U */
				dst[(((h - i) * 2) - 3) + (j * frame->pitch[0])] = src[(j * 2) + 1 + (i * pitch)];
				dst[(((h - i) * 2) - 3) + ((j + 1) * frame->pitch[0])] = src[(j * 2) + 1 + ((i + 1) * pitch)];
				/* Copy V */
				dst[(((h - i) * 2) - 1) + (j * frame->pitch[0])] = src[(j * 2) + 3 + (i * pitch)];
				dst[(((h - i) * 2) - 1) + ((j + 1) * frame->pitch[0])] = src[(j * 2) + 3 + ((i + 1) * pitch)];
			}
		}
		break;
	}
}

Bool
sna_video_copy_data(struct sna *sna,
		    struct sna_video *video,
		    struct sna_video_frame *frame,
		    const uint8_t *buf)
{
	uint8_t *dst;

	if (frame->bo == NULL)
		return FALSE;

	/* In the common case, we can simply the upload in a single pwrite */
	if (video->rotation == RR_Rotate_0) {
		if (is_planar_fourcc(frame->id)) {
			uint16_t pitch[2] = {
				ALIGN((frame->width >> 1), 0x4),
				ALIGN(frame->width, 0x4),
			};
			if (pitch[0] == frame->pitch[0] &&
			    pitch[1] == frame->pitch[1] &&
			    frame->top == 0 && frame->left == 0) {
				kgem_bo_write(&sna->kgem, frame->bo,
					      buf,
					      pitch[1]*frame->height +
					      pitch[0]*frame->height);
				if (frame->id != FOURCC_I420) {
					uint32_t tmp;
					tmp = frame->VBufOffset;
					frame->VBufOffset = frame->UBufOffset;
					frame->UBufOffset = tmp;
				}
				return TRUE;
			}
		} else {
			if (frame->width*2 == frame->pitch[0]) {
				kgem_bo_write(&sna->kgem, frame->bo,
					      buf + (frame->top * frame->width*2) + (frame->left << 1),
					      frame->nlines*frame->width*2);
				return TRUE;
			}
		}
	}

	/* copy data */
	dst = kgem_bo_map(&sna->kgem, frame->bo, PROT_READ | PROT_WRITE);
	if (dst == NULL)
		return FALSE;

	if (is_planar_fourcc(frame->id))
		sna_copy_planar_data(video, frame, buf, dst);
	else
		sna_copy_packed_data(video, frame, buf, dst);

	return TRUE;
}

void sna_video_init(struct sna *sna, ScreenPtr screen)
{
	XF86VideoAdaptorPtr *adaptors, *newAdaptors;
	XF86VideoAdaptorPtr textured, overlay;
	int num_adaptors;
	int prefer_overlay =
	    xf86ReturnOptValBool(sna->Options, OPTION_PREFER_OVERLAY, FALSE);

	if (!xf86LoaderCheckSymbol("xf86XVListGenericAdaptors"))
		return;

	num_adaptors = xf86XVListGenericAdaptors(sna->scrn, &adaptors);
	newAdaptors =
	    malloc((num_adaptors + 2) * sizeof(XF86VideoAdaptorPtr *));
	if (newAdaptors == NULL)
		return;

	memcpy(newAdaptors, adaptors,
	       num_adaptors * sizeof(XF86VideoAdaptorPtr));
	adaptors = newAdaptors;

	/* Set up textured video if we can do it at this depth and we are on
	 * supported hardware.
	 */
	textured = sna_video_textured_setup(sna, screen);
	overlay = sna_video_overlay_setup(sna, screen);

	if (overlay && prefer_overlay)
		adaptors[num_adaptors++] = overlay;

	if (textured)
		adaptors[num_adaptors++] = textured;

	if (overlay && !prefer_overlay)
		adaptors[num_adaptors++] = overlay;

	if (num_adaptors)
		xf86XVScreenInit(screen, adaptors, num_adaptors);
	else
		xf86DrvMsg(sna->scrn->scrnIndex, X_WARNING,
			   "Disabling Xv because no adaptors could be initialized.\n");
	if (textured)
		sna_video_xvmc_setup(sna, screen, textured);

	free(adaptors);
}