32bpp_anim.cpp

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/* $Id: 32bpp_anim.cpp 18907 2010-01-23 22:37:14Z alberth $ */

/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */

#include "../stdafx.h"
#include "../core/math_func.hpp"
#include "../video/video_driver.hpp"
#include "32bpp_anim.hpp"

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

static FBlitter_32bppAnim iFBlitter_32bppAnim;

template <BlitterMode mode>
inline void Blitter_32bppAnim::Draw(const Blitter::BlitterParams *bp, ZoomLevel zoom)
{
  const SpriteData *src = (const SpriteData *)bp->sprite;

  const Colour *src_px = (const Colour *)(src->data + src->offset[zoom][0]);
  const uint8  *src_n  = (const uint8  *)(src->data + src->offset[zoom][1]);

  for (uint i = bp->skip_top; i != 0; i--) {
    src_px = (const Colour *)((const byte *)src_px + *(const uint32 *)src_px);
    src_n += *(const uint32 *)src_n;
  }

  uint32 *dst = (uint32 *)bp->dst + bp->top * bp->pitch + bp->left;
  uint8 *anim = this->anim_buf + ((uint32 *)bp->dst - (uint32 *)_screen.dst_ptr) + bp->top * this->anim_buf_width + bp->left;

  const byte *remap = bp->remap; // store so we don't have to access it via bp everytime

  for (int y = 0; y < bp->height; y++) {
    uint32 *dst_ln = dst + bp->pitch;
    uint8 *anim_ln = anim + this->anim_buf_width;

    const Colour *src_px_ln = (const Colour *)((const byte *)src_px + *(const uint32 *)src_px);
    src_px++;

    const uint8 *src_n_ln = src_n + *(uint32 *)src_n;
    src_n += 4;

    uint32 *dst_end = dst + bp->skip_left;

    uint n;

    while (dst < dst_end) {
      n = *src_n++;

      if (src_px->a == 0) {
        dst += n;
        src_px ++;
        src_n++;

        if (dst > dst_end) anim += dst - dst_end;
      } else {
        if (dst + n > dst_end) {
          uint d = dst_end - dst;
          src_px += d;
          src_n += d;

          dst = dst_end - bp->skip_left;
          dst_end = dst + bp->width;

          n = min<uint>(n - d, (uint)bp->width);
          goto draw;
        }
        dst += n;
        src_px += n;
        src_n += n;
      }
    }

    dst -= bp->skip_left;
    dst_end -= bp->skip_left;

    dst_end += bp->width;

    while (dst < dst_end) {
      n = min<uint>(*src_n++, (uint)(dst_end - dst));

      if (src_px->a == 0) {
        anim += n;
        dst += n;
        src_px++;
        src_n++;
        continue;
      }

      draw:;

      switch (mode) {
        case BM_COLOUR_REMAP:
          if (src_px->a == 255) {
            do {
              uint m = *src_n;
              /* In case the m-channel is zero, do not remap this pixel in any way */
              if (m == 0) {
                *dst = src_px->data;
                *anim = 0;
              } else {
                uint r = remap[m];
                *anim = r;
                if (r != 0) *dst = this->LookupColourInPalette(r);
              }
              anim++;
              dst++;
              src_px++;
              src_n++;
            } while (--n != 0);
          } else {
            do {
              uint m = *src_n;
              if (m == 0) {
                *dst = ComposeColourRGBANoCheck(src_px->r, src_px->g, src_px->b, src_px->a, *dst);
                *anim = 0;
              } else {
                uint r = remap[m];
                *anim = r;
                if (r != 0) *dst = ComposeColourPANoCheck(this->LookupColourInPalette(r), src_px->a, *dst);
              }
              anim++;
              dst++;
              src_px++;
              src_n++;
            } while (--n != 0);
          }
          break;

        case BM_TRANSPARENT:
          /* TODO -- We make an assumption here that the remap in fact is transparency, not some colour.
           *  This is never a problem with the code we produce, but newgrfs can make it fail... or at least:
           *  we produce a result the newgrf maker didn't expect ;) */

          /* Make the current colour a bit more black, so it looks like this image is transparent */
          src_n += n;
          if (src_px->a == 255) {
            src_px += n;
            do {
              *dst = MakeTransparent(*dst, 3, 4);
              *anim = remap[*anim];
              anim++;
              dst++;
            } while (--n != 0);
          } else {
            do {
              *dst = MakeTransparent(*dst, (256 * 4 - src_px->a), 256 * 4);
              *anim = remap[*anim];
              anim++;
              dst++;
              src_px++;
            } while (--n != 0);
          }
          break;

        default:
          if (src_px->a == 255) {
            do {
              /* Compiler assumes pointer aliasing, can't optimise this on its own */
              uint m = *src_n++;
              /* Above 217 (PALETTE_ANIM_SIZE_START) is palette animation */
              *anim++ = m;
              *dst++ = (m >= PALETTE_ANIM_SIZE_START) ? this->LookupColourInPalette(m) : src_px->data;
              src_px++;
            } while (--n != 0);
          } else {
            do {
              uint m = *src_n++;
              *anim++ = m;
              if (m >= PALETTE_ANIM_SIZE_START) {
                *dst = ComposeColourPANoCheck(this->LookupColourInPalette(m), src_px->a, *dst);
              } else {
                *dst = ComposeColourRGBANoCheck(src_px->r, src_px->g, src_px->b, src_px->a, *dst);
              }
              dst++;
              src_px++;
            } while (--n != 0);
          }
          break;
      }
    }

    anim = anim_ln;
    dst = dst_ln;
    src_px = src_px_ln;
    src_n  = src_n_ln;
  }
}

void Blitter_32bppAnim::Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom)
{
  if (_screen_disable_anim) {
    /* This means our output is not to the screen, so we can't be doing any animation stuff, so use our parent Draw() */
    Blitter_32bppOptimized::Draw(bp, mode, zoom);
    return;
  }

  switch (mode) {
    default: NOT_REACHED();
    case BM_NORMAL:       Draw<BM_NORMAL>      (bp, zoom); return;
    case BM_COLOUR_REMAP: Draw<BM_COLOUR_REMAP>(bp, zoom); return;
    case BM_TRANSPARENT:  Draw<BM_TRANSPARENT> (bp, zoom); return;
  }
}

void Blitter_32bppAnim::DrawColourMappingRect(void *dst, int width, int height, PaletteID pal)
{
  if (_screen_disable_anim) {
    /* This means our output is not to the screen, so we can't be doing any animation stuff, so use our parent DrawColourMappingRect() */
    Blitter_32bppOptimized::DrawColourMappingRect(dst, width, height, pal);
    return;
  }

  uint32 *udst = (uint32 *)dst;
  uint8 *anim;

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

  if (pal == PALETTE_TO_TRANSPARENT) {
    do {
      for (int i = 0; i != width; i++) {
        *udst = MakeTransparent(*udst, 154);
        *anim = 0;
        udst++;
        anim++;
      }
      udst = udst - width + _screen.pitch;
      anim = anim - width + this->anim_buf_width;
    } while (--height);
    return;
  }
  if (pal == PALETTE_TO_STRUCT_GREY) {
    do {
      for (int i = 0; i != width; i++) {
        *udst = MakeGrey(*udst);
        *anim = 0;
        udst++;
        anim++;
      }
      udst = udst - width + _screen.pitch;
      anim = anim - width + this->anim_buf_width;
    } while (--height);
    return;
  }

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

void Blitter_32bppAnim::SetPixel(void *video, int x, int y, uint8 colour)
{
  *((uint32 *)video + x + y * _screen.pitch) = LookupColourInPalette(colour);

  /* Set the colour in the anim-buffer too, if we are rendering to the screen */
  if (_screen_disable_anim) return;
  this->anim_buf[((uint32 *)video - (uint32 *)_screen.dst_ptr) + x + y * this->anim_buf_width] = colour;
}

void Blitter_32bppAnim::DrawRect(void *video, int width, int height, uint8 colour)
{
  if (_screen_disable_anim) {
    /* This means our output is not to the screen, so we can't be doing any animation stuff, so use our parent DrawRect() */
    Blitter_32bppOptimized::DrawRect(video, width, height, colour);
    return;
  }

  uint32 colour32 = LookupColourInPalette(colour);
  uint8 *anim_line;

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

  do {
    uint32 *dst = (uint32 *)video;
    uint8 *anim = anim_line;

    for (int i = width; i > 0; i--) {
      *dst = colour32;
      /* Set the colour in the anim-buffer too */
      *anim = colour;
      dst++;
      anim++;
    }
    video = (uint32 *)video + _screen.pitch;
    anim_line += this->anim_buf_width;
  } while (--height);
}

void Blitter_32bppAnim::CopyFromBuffer(void *video, const void *src, int width, int height)
{
  assert(!_screen_disable_anim);
  assert(video >= _screen.dst_ptr && video <= (uint32 *)_screen.dst_ptr + _screen.width + _screen.height * _screen.pitch);
  uint32 *dst = (uint32 *)video;
  uint32 *usrc = (uint32 *)src;
  uint8 *anim_line = ((uint32 *)video - (uint32 *)_screen.dst_ptr) + this->anim_buf;

  int count = (_use_palette == PAL_DOS) ? PALETTE_ANIM_SIZE_DOS : PALETTE_ANIM_SIZE_WIN;

  for (; height > 0; height--) {
    /* We need to keep those for palette animation. */
    uint32 *dst_pal = dst;
    uint8 *anim_pal = anim_line;

    memcpy(dst, usrc, width * sizeof(uint32));
    usrc += width;
    dst += _screen.pitch;
    /* Copy back the anim-buffer */
    memcpy(anim_line, usrc, width * sizeof(uint8));
    usrc = (uint32 *)((uint8 *)usrc + width);
    anim_line += this->anim_buf_width;

    /* Okay, it is *very* likely that the image we stored is using
     * the wrong palette animated colours. There are two things we
     * can do to fix this. The first is simply reviewing the whole
     * screen after we copied the buffer, i.e. run PaletteAnimate,
     * however that forces a full screen redraw which is expensive
     * for just the cursor. This just copies the implementation of
     * palette animation, much cheaper though slightly nastier. */
    for (int i = 0; i < width; i++) {
      uint colour = *anim_pal;
      if (IsInsideBS(colour, PALETTE_ANIM_SIZE_START, count)) {
        /* Update this pixel */
        *dst_pal = LookupColourInPalette(colour);
      }
      dst_pal++;
      anim_pal++;
    }
  }
}

void Blitter_32bppAnim::CopyToBuffer(const void *video, void *dst, int width, int height)
{
  assert(!_screen_disable_anim);
  assert(video >= _screen.dst_ptr && video <= (uint32 *)_screen.dst_ptr + _screen.width + _screen.height * _screen.pitch);
  uint32 *udst = (uint32 *)dst;
  uint32 *src = (uint32 *)video;
  uint8 *anim_line;

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

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

  for (; height > 0; height--) {
    memcpy(udst, src, width * sizeof(uint32));
    src += _screen.pitch;
    udst += width;
    /* Copy the anim-buffer */
    memcpy(udst, anim_line, width * sizeof(uint8));
    udst = (uint32 *)((uint8 *)udst + width);
    anim_line += this->anim_buf_width;
  }
}

void Blitter_32bppAnim::ScrollBuffer(void *video, int &left, int &top, int &width, int &height, int scroll_x, int scroll_y)
{
  assert(!_screen_disable_anim);
  assert(video >= _screen.dst_ptr && video <= (uint32 *)_screen.dst_ptr + _screen.width + _screen.height * _screen.pitch);
  uint8 *dst, *src;

  /* We need to scroll the anim-buffer too */
  if (scroll_y > 0) {
    dst = this->anim_buf + left + (top + height - 1) * this->anim_buf_width;
    src = dst - scroll_y * this->anim_buf_width;

    /* Adjust left & width */
    if (scroll_x >= 0) {
      dst += scroll_x;
    } else {
      src -= scroll_x;
    }

    uint tw = width + (scroll_x >= 0 ? -scroll_x : scroll_x);
    uint th = height - scroll_y;
    for (; th > 0; th--) {
      memcpy(dst, src, tw * sizeof(uint8));
      src -= this->anim_buf_width;
      dst -= this->anim_buf_width;
    }
  } else {
    /* Calculate pointers */
    dst = this->anim_buf + left + top * this->anim_buf_width;
    src = dst - scroll_y * this->anim_buf_width;

    /* Adjust left & width */
    if (scroll_x >= 0) {
      dst += scroll_x;
    } else {
      src -= scroll_x;
    }

    /* the y-displacement may be 0 therefore we have to use memmove,
     * because source and destination may overlap */
    uint tw = width + (scroll_x >= 0 ? -scroll_x : scroll_x);
    uint th = height + scroll_y;
    for (; th > 0; th--) {
      memmove(dst, src, tw * sizeof(uint8));
      src += this->anim_buf_width;
      dst += this->anim_buf_width;
    }
  }

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

int Blitter_32bppAnim::BufferSize(int width, int height)
{
  return width * height * (sizeof(uint32) + sizeof(uint8));
}

void Blitter_32bppAnim::PaletteAnimate(uint start, uint count)
{
  assert(!_screen_disable_anim);

  /* Never repaint the transparency pixel */
  if (start == 0) {
    start++;
    count--;
  }

  const uint8 *anim = this->anim_buf;
  uint32 *dst = (uint32 *)_screen.dst_ptr;

  /* Let's walk the anim buffer and try to find the pixels */
  for (int y = this->anim_buf_height; y != 0 ; y--) {
    for (int x = this->anim_buf_width; x != 0 ; x--) {
      uint colour = *anim;
      if (IsInsideBS(colour, start, count)) {
        /* Update this pixel */
        *dst = LookupColourInPalette(colour);
      }
      dst++;
      anim++;
    }
    dst += _screen.pitch - this->anim_buf_width;
  }

  /* Make sure the backend redraws the whole screen */
  _video_driver->MakeDirty(0, 0, _screen.width, _screen.height);
}

Blitter::PaletteAnimation Blitter_32bppAnim::UsePaletteAnimation()
{
  return Blitter::PALETTE_ANIMATION_BLITTER;
}

void Blitter_32bppAnim::PostResize()
{
  if (_screen.width != this->anim_buf_width || _screen.height != this->anim_buf_height) {
    /* The size of the screen changed; we can assume we can wipe all data from our buffer */
    free(this->anim_buf);
    this->anim_buf = CallocT<uint8>(_screen.width * _screen.height);
    this->anim_buf_width = _screen.width;
    this->anim_buf_height = _screen.height;
  }
}