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/* $Id$ */

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/** @file 32bpp_anim.cpp Implementation of the optimized 32 bpp blitter with animation support. */

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#include "../stdafx.h"

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#include "../core/alloc_func.hpp"

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#include "../gfx_func.h"

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#include "../zoom_func.h"

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#include "../debug.h"

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#include "../video/video_driver.hpp"

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#include "32bpp_anim.hpp"

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#include "../table/sprites.h"

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static FBlitter_32bppAnim iFBlitter_32bppAnim;

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void Blitter_32bppAnim::Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom)

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{

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	if (_screen_disable_anim) {

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		/* This means our output is not to the screen, so we can't be doing any animation stuff, so use our parent Draw() */

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		Blitter_32bppOptimized::Draw(bp, mode, zoom);

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		return;

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	}

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	const SpriteLoader::CommonPixel *src, *src_line;

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	uint32 *dst, *dst_line;

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	uint8 *anim, *anim_line;

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	if (_screen.width != this->anim_buf_width || _screen.height != this->anim_buf_height) {

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		/* The size of the screen changed; we can assume we can wipe all data from our buffer */

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		free(this->anim_buf);

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		this->anim_buf = CallocT<uint8>(_screen.width * _screen.height);

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		this->anim_buf_width = _screen.width;

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		this->anim_buf_height = _screen.height;

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	}

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	/* Find where to start reading in the source sprite */

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	src_line = (const SpriteLoader::CommonPixel *)bp->sprite + (bp->skip_top * bp->sprite_width + bp->skip_left) * ScaleByZoom(1, zoom);

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	dst_line = (uint32 *)bp->dst + bp->top * bp->pitch + bp->left;

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	anim_line = this->anim_buf + ((uint32 *)bp->dst - (uint32 *)_screen.dst_ptr) + bp->top * this->anim_buf_width + bp->left;

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	for (int y = 0; y < bp->height; y++) {

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		dst = dst_line;

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		dst_line += bp->pitch;

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		src = src_line;

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		src_line += bp->sprite_width * ScaleByZoom(1, zoom);

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		anim = anim_line;

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		anim_line += this->anim_buf_width;

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		for (int x = 0; x < bp->width; x++) {

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			if (src->a == 0) {

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				/* src->r is 'misused' here to indicate how much more pixels are following with an alpha of 0 */

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				int skip = UnScaleByZoom(src->r, zoom);

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				dst  += skip;

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				anim += skip;

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				x    += skip - 1;

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				src  += ScaleByZoom(1, zoom) * skip;

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				continue;

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			}

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			switch (mode) {

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				case BM_COLOUR_REMAP:

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					/* In case the m-channel is zero, do not remap this pixel in any way */

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					if (src->m == 0) {

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						*dst = ComposeColourRGBA(src->r, src->g, src->b, src->a, *dst);

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						*anim = 0;

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					} else {

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						if (bp->remap[src->m] != 0) {

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							*dst = ComposeColourPA(this->LookupColourInPalette(bp->remap[src->m]), src->a, *dst);

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							*anim = bp->remap[src->m];

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						}

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					}

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					break;

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				case BM_TRANSPARENT:

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					/* TODO -- We make an assumption here that the remap in fact is transparency, not some color.

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					 *  This is never a problem with the code we produce, but newgrfs can make it fail... or at least:

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					 *  we produce a result the newgrf maker didn't expect ;) */

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					/* Make the current color a bit more black, so it looks like this image is transparent */

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					*dst = MakeTransparent(*dst, 192);

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					*anim = bp->remap[*anim];

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					break;

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				default:

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					/* Above 217 is palette animation */

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					if (src->m >= 217) *dst = ComposeColourPA(this->LookupColourInPalette(src->m), src->a, *dst);

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					else               *dst = ComposeColourRGBA(src->r, src->g, src->b, src->a, *dst);

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					*anim = src->m;

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					break;

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			}

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			dst++;

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			anim++;

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			src += ScaleByZoom(1, zoom);

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		}

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	}

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}

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void Blitter_32bppAnim::DrawColorMappingRect(void *dst, int width, int height, int pal)

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{

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	if (_screen_disable_anim) {

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		/* This means our output is not to the screen, so we can't be doing any animation stuff, so use our parent DrawColorMappingRect() */

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		Blitter_32bppOptimized::DrawColorMappingRect(dst, width, height, pal);

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		return;

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	}

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	uint32 *udst = (uint32 *)dst;

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	uint8 *anim;

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	anim = this->anim_buf + ((uint32 *)dst - (uint32 *)_screen.dst_ptr);

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	if (pal == PALETTE_TO_TRANSPARENT) {

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		do {

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			for (int i = 0; i != width; i++) {

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				*udst = MakeTransparent(*udst, 154);

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				*anim = 0;

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				udst++;

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				anim++;

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			}

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			udst = udst - width + _screen.pitch;

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			anim = anim - width + this->anim_buf_width;

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		} while (--height);

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		return;

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	}

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	if (pal == PALETTE_TO_STRUCT_GREY) {

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		do {

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			for (int i = 0; i != width; i++) {

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				*udst = MakeGrey(*udst);

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				*anim = 0;

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				udst++;

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				anim++;

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			}

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			udst = udst - width + _screen.pitch;

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			anim = anim - width + this->anim_buf_width;

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		} while (--height);

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		return;

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	}

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	DEBUG(misc, 0, "32bpp blitter doesn't know how to draw this color table ('%d')", pal);

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}

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void Blitter_32bppAnim::SetPixel(void *video, int x, int y, uint8 color)

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{

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	*((uint32 *)video + x + y * _screen.pitch) = LookupColourInPalette(color);

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	/* Set the color in the anim-buffer too, if we are rendering to the screen */

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	if (_screen_disable_anim) return;

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	this->anim_buf[((uint32 *)video - (uint32 *)_screen.dst_ptr) + x + y * this->anim_buf_width] = color;

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}

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void Blitter_32bppAnim::SetPixelIfEmpty(void *video, int x, int y, uint8 color)

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{

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	uint32 *dst = (uint32 *)video + x + y * _screen.pitch;

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	if (*dst == 0) {

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		*dst = LookupColourInPalette(color);

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		/* Set the color in the anim-buffer too, if we are rendering to the screen */

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		if (_screen_disable_anim) return;

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		this->anim_buf[((uint32 *)video - (uint32 *)_screen.dst_ptr) + x + y * this->anim_buf_width] = color;

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	}

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}

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void Blitter_32bppAnim::DrawRect(void *video, int width, int height, uint8 color)

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{

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	if (_screen_disable_anim) {

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		/* This means our output is not to the screen, so we can't be doing any animation stuff, so use our parent DrawRect() */

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		Blitter_32bppOptimized::DrawRect(video, width, height, color);

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		return;

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	}

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	uint32 color32 = LookupColourInPalette(color);

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	uint8 *anim_line;

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	anim_line = ((uint32 *)video - (uint32 *)_screen.dst_ptr) + this->anim_buf;

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	do {

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		uint32 *dst = (uint32 *)video;

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		uint8 *anim = anim_line;

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		for (int i = width; i > 0; i--) {

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			*dst = color32;

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			/* Set the color in the anim-buffer too */

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			*anim = color;

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			dst++;

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			anim++;

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		}

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		video = (uint32 *)video + _screen.pitch;

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		anim_line += this->anim_buf_width;

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	} while (--height);

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}

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void Blitter_32bppAnim::CopyFromBuffer(void *video, const void *src, int width, int height)

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{

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	assert(!_screen_disable_anim);

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	assert(video >= _screen.dst_ptr && video <= (uint32 *)_screen.dst_ptr + _screen.width + _screen.height * _screen.pitch);

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	uint32 *dst = (uint32 *)video;

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	uint32 *usrc = (uint32 *)src;

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	uint8 *anim_line;

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	anim_line = ((uint32 *)video - (uint32 *)_screen.dst_ptr) + this->anim_buf;

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	for (; height > 0; height--) {

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		memcpy(dst, usrc, width * sizeof(uint32));

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		usrc += width;

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		dst += _screen.pitch;

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		/* Copy back the anim-buffer */

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		memcpy(anim_line, usrc, width * sizeof(uint8));

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		usrc = (uint32 *)((uint8 *)usrc + width);

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		anim_line += this->anim_buf_width;

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	}

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	/* We update the palette (or the pixels that do animation) immediatly, to avoid graphical glitches */

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	this->PaletteAnimate(217, _use_dos_palette ? 38 : 28);

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}

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void Blitter_32bppAnim::CopyToBuffer(const void *video, void *dst, int width, int height)

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{

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	assert(!_screen_disable_anim);

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	assert(video >= _screen.dst_ptr && video <= (uint32 *)_screen.dst_ptr + _screen.width + _screen.height * _screen.pitch);

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	uint32 *udst = (uint32 *)dst;

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	uint32 *src = (uint32 *)video;

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	uint8 *anim_line;

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	if (this->anim_buf == NULL) return;

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	anim_line = ((uint32 *)video - (uint32 *)_screen.dst_ptr) + this->anim_buf;

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	for (; height > 0; height--) {

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		memcpy(udst, src, width * sizeof(uint32));

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		src += _screen.pitch;

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		udst += width;

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		/* Copy the anim-buffer */

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		memcpy(udst, anim_line, width * sizeof(uint8));

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		udst = (uint32 *)((uint8 *)udst + width);

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		anim_line += this->anim_buf_width;

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	}

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}

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void Blitter_32bppAnim::ScrollBuffer(void *video, int &left, int &top, int &width, int &height, int scroll_x, int scroll_y)

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{

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	assert(!_screen_disable_anim);

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	assert(video >= _screen.dst_ptr && video <= (uint32 *)_screen.dst_ptr + _screen.width + _screen.height * _screen.pitch);

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	uint8 *dst, *src;

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	/* We need to scroll the anim-buffer too */

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	if (scroll_y > 0) {

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		dst = this->anim_buf + left + (top + height - 1) * this->anim_buf_width;

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		src = dst - scroll_y * this->anim_buf_width;

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		/* Adjust left & width */

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		if (scroll_x >= 0) dst += scroll_x;

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		else               src -= scroll_x;

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		uint tw = width + (scroll_x >= 0 ? -scroll_x : scroll_x);

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		uint th = height - scroll_y;

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		for (; th > 0; th--) {

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			memcpy(dst, src, tw * sizeof(uint8));

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			src -= this->anim_buf_width;

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			dst -= this->anim_buf_width;

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		}

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	} else {

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		/* Calculate pointers */

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		dst = this->anim_buf + left + top * this->anim_buf_width;

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		src = dst - scroll_y * this->anim_buf_width;

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		/* Adjust left & width */

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		if (scroll_x >= 0) dst += scroll_x;

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		else               src -= scroll_x;

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		/* the y-displacement may be 0 therefore we have to use memmove,

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		 * because source and destination may overlap */

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		uint tw = width + (scroll_x >= 0 ? -scroll_x : scroll_x);

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		uint th = height + scroll_y;

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		for (; th > 0; th--) {

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			memmove(dst, src, tw * sizeof(uint8));

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			src += this->anim_buf_width;

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			dst += this->anim_buf_width;

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		}

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	}

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	Blitter_32bppBase::ScrollBuffer(video, left, top, width, height, scroll_x, scroll_y);

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}

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int Blitter_32bppAnim::BufferSize(int width, int height)

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{

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	return width * height * (sizeof(uint32) + sizeof(uint8));

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}

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void Blitter_32bppAnim::PaletteAnimate(uint start, uint count)

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{

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	assert(!_screen_disable_anim);

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	uint8 *anim = this->anim_buf;

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	/* Never repaint the transparency pixel */

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	if (start == 0) start++;

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	/* Let's walk the anim buffer and try to find the pixels */

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	for (int y = 0; y < this->anim_buf_height; y++) {

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		for (int x = 0; x < this->anim_buf_width; x++) {

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			if (*anim >= start && *anim <= start + count) {

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				/* Update this pixel */

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				this->SetPixel(_screen.dst_ptr, x, y, *anim);

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			}

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			anim++;

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		}

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	}

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	/* Make sure the backend redraws the whole screen */

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	_video_driver->MakeDirty(0, 0, _screen.width, _screen.height);

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}

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Blitter::PaletteAnimation Blitter_32bppAnim::UsePaletteAnimation()

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{

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	return Blitter::PALETTE_ANIMATION_BLITTER;

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}