40bpp_anim.cpp

/*
 * 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 "../zoom_func.h"
#include "../settings_type.h"
#include "../video/video_driver.hpp"
#include "40bpp_anim.hpp"
#include "common.hpp"
 
#include "../table/sprites.h"
 
#include "../safeguards.h"
 
 
static FBlitter_40bppAnim iFBlitter_40bppAnim;
 
static const Colour _black_colour(0, 0, 0);
 
 
void Blitter_40bppAnim::SetPixel(void *video, int x, int y, uint8 colour)
{
  if (_screen_disable_anim) {
    Blitter_32bppOptimized::SetPixel(video, x, y, colour);
  } else {
    *((Colour *)video + x + y * _screen.pitch) = _black_colour;
 
    VideoDriver::GetInstance()->GetAnimBuffer()[((uint32 *)video - (uint32 *)_screen.dst_ptr) + x + y * _screen.pitch] = colour;
  }
}
 
void Blitter_40bppAnim::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;
  }
 
  assert(VideoDriver::GetInstance()->GetAnimBuffer() != nullptr);
  uint8 *anim_line = ((uint32 *)video - (uint32 *)_screen.dst_ptr) + VideoDriver::GetInstance()->GetAnimBuffer();
 
  do {
    Colour *dst = (Colour *)video;
    uint8 *anim = anim_line;
 
    for (int i = width; i > 0; i--) {
      *dst = _black_colour;
      *anim = colour;
      dst++;
      anim++;
    }
    video = (uint32 *)video + _screen.pitch;
    anim_line += _screen.pitch;
  } while (--height);
}
 
void Blitter_40bppAnim::DrawLine(void *video, int x, int y, int x2, int y2, int screen_width, int screen_height, uint8 colour, int width, int dash)
{
  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::DrawLine(video, x, y, x2, y2, screen_width, screen_height, colour, width, dash);
    return;
  }
 
  assert(VideoDriver::GetInstance()->GetAnimBuffer() != nullptr);
  uint8 *anim = ((uint32 *)video - (uint32 *)_screen.dst_ptr) + VideoDriver::GetInstance()->GetAnimBuffer();
 
  this->DrawLineGeneric(x, y, x2, y2, screen_width, screen_height, width, dash, [=](int x, int y) {
    *((Colour *)video + x + y * _screen.pitch) = _black_colour;
    *(anim + x + y * _screen.pitch) = colour;
  });
}
 
template <BlitterMode mode>
inline void Blitter_40bppAnim::Draw(const Blitter::BlitterParams *bp, ZoomLevel zoom)
{
  const SpriteData *src = (const SpriteData *)bp->sprite;
 
  /* src_px : each line begins with uint32 n = 'number of bytes in this line',
   *          then n times is the Colour struct for this line */
  const Colour *src_px = (const Colour *)(src->data + src->offset[zoom][0]);
  /* src_n  : each line begins with uint32 n = 'number of bytes in this line',
   *          then interleaved stream of 'm' and 'n' channels. 'm' is remap,
   *          'n' is number of bytes with the same alpha channel class */
  const uint16 *src_n  = (const uint16 *)(src->data + src->offset[zoom][1]);
 
  /* skip upper lines in src_px and src_n */
  for (uint i = bp->skip_top; i != 0; i--) {
    src_px = (const Colour *)((const byte *)src_px + *(const uint32 *)src_px);
    src_n = (const uint16 *)((const byte *)src_n + *(const uint32 *)src_n);
  }
 
  /* skip lines in dst */
  Colour *dst = (Colour *)bp->dst + bp->top * bp->pitch + bp->left;
  assert(VideoDriver::GetInstance()->GetAnimBuffer() != nullptr);
  uint8 *anim = VideoDriver::GetInstance()->GetAnimBuffer() + ((uint32 *)bp->dst - (uint32 *)_screen.dst_ptr) + bp->top * bp->pitch + bp->left;
 
  /* store so we don't have to access it via bp everytime (compiler assumes pointer aliasing) */
  const byte *remap = bp->remap;
 
  for (int y = 0; y < bp->height; y++) {
    /* next dst line begins here */
    Colour *dst_ln = dst + bp->pitch;
    uint8 *anim_ln = anim + bp->pitch;
 
    /* next src line begins here */
    const Colour *src_px_ln = (const Colour *)((const byte *)src_px + *(const uint32 *)src_px);
    src_px++;
 
    /* next src_n line begins here */
    const uint16 *src_n_ln = (const uint16 *)((const byte *)src_n + *(const uint32 *)src_n);
    src_n += 2;
 
    /* we will end this line when we reach this point */
    Colour *dst_end = dst + bp->skip_left;
 
    /* number of pixels with the same alpha channel class */
    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 = std::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 = std::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:
        case BM_CRASH_REMAP:
          if (src_px->a == 255) {
            do {
              uint8 m = GB(*src_n, 0, 8);
              /* In case the m-channel is zero, only apply the crash remap by darkening the RGB colour. */
              if (m == 0) {
                *dst = mode == BM_CRASH_REMAP ? this->MakeDark(*src_px) : *src_px;
                *anim = 0;
              } else {
                uint r = remap[m];
                if (r != 0) {
                  *dst = src_px->data;
                  *anim = r;
                }
              }
              anim++;
              dst++;
              src_px++;
              src_n++;
            } while (--n != 0);
          } else {
            do {
              uint8 m = GB(*src_n, 0, 8);
              Colour b = this->RealizeBlendedColour(*anim, *dst);
              if (m == 0) {
                Colour c = mode == BM_CRASH_REMAP ? this->MakeDark(*src_px) : *src_px;
                *dst = this->ComposeColourRGBANoCheck(c.r, c.g, c.b, src_px->a, b);
                *anim = 0;
              } else {
                uint r = remap[m];
                if (r != 0) {
                  *dst = this->ComposeColourPANoCheck(this->LookupColourInPalette(r), src_px->a, b);
                  *anim = 0; // Animation colours don't work with alpha-blending.
                }
              }
              anim++;
              dst++;
              src_px++;
              src_n++;
            } while (--n != 0);
          }
          break;
 
        case BM_BLACK_REMAP:
          do {
            *anim++ = 0;
            *dst++ = _black_colour;
            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 {
              /* If the anim buffer contains a color value, the image composition will
               * only look at the RGB brightness value. As such, we can simply darken the
               * RGB value to darken the anim color. */
              Colour b = *anim != 0 ? Colour(this->GetColourBrightness(*dst), 0, 0) : *dst;
              *dst = this->MakeTransparent(b, 3, 4);
              anim++;
              dst++;
            } while (--n != 0);
          } else {
            do {
              Colour b = this->RealizeBlendedColour(*anim, *dst);
              *dst = this->MakeTransparent(b, (256 * 4 - src_px->a), 256 * 4);
              *anim = 0; // Animation colours don't work with alpha-blending.
              anim++;
              dst++;
              src_px++;
            } while (--n != 0);
          }
          break;
 
        default:
          if (src_px->a == 255) {
            do {
              *anim++ = GB(*src_n, 0, 8);
              *dst++ = src_px->data;
              src_px++;
              src_n++;
            } while (--n != 0);
            break;
          } else {
            do {
              uint8 m = GB(*src_n, 0, 8);
              Colour b = this->RealizeBlendedColour(*anim, *dst);
 
              if (m == 0) {
                *dst = this->ComposeColourRGBANoCheck(src_px->r, src_px->g, src_px->b, src_px->a, b);
                *anim = 0;
              } else {
                *dst = this->ComposeColourPANoCheck(this->LookupColourInPalette(m), src_px->a, b);
                *anim = m;
              }
 
              anim++;
              dst++;
              src_px++;
              src_n++;
            } while (--n != 0);
          }
      }
    }
 
    dst = dst_ln;
    anim = anim_ln;
    src_px = src_px_ln;
    src_n  = src_n_ln;
  }
}
 
void Blitter_40bppAnim::Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom)
{
  assert(_screen.dst_ptr != nullptr);
 
  if (_screen_disable_anim || VideoDriver::GetInstance()->GetAnimBuffer() == nullptr) {
    /* 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<true>(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;
    case BM_CRASH_REMAP:  Draw<BM_CRASH_REMAP> (bp, zoom); return;
    case BM_BLACK_REMAP:  Draw<BM_BLACK_REMAP> (bp, zoom); return;
  }
}
 
void Blitter_40bppAnim::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;
  }
 
  Colour *udst = (Colour *)dst;
  uint8 *anim = VideoDriver::GetInstance()->GetAnimBuffer() + ((uint32 *)dst - (uint32 *)_screen.dst_ptr);
 
  if (pal == PALETTE_TO_TRANSPARENT) {
    /* If the anim buffer contains a color value, the image composition will
     * only look at the RGB brightness value. As such, we can simply darken the
     * RGB value to darken the anim color. */
    do {
      for (int i = 0; i != width; i++) {
        Colour b = *anim != 0 ? Colour(this->GetColourBrightness(*udst), 0, 0) : *udst;
        *udst = MakeTransparent(b, 154);
        udst++;
        anim++;
      }
      udst = udst - width + _screen.pitch;
      anim = anim - width + _screen.pitch;
    } while (--height);
  } else if (pal == PALETTE_NEWSPAPER) {
    const uint8 *remap = GetNonSprite(pal, ST_RECOLOUR) + 1;
    do {
      for (int i = 0; i != width; i++) {
        if (*anim == 0) *udst = MakeGrey(*udst);
        *anim = remap[*anim];
        udst++;
        anim++;
      }
      udst = udst - width + _screen.pitch;
      anim = anim - width + _screen.pitch;
    } while (--height);
  } else {
    const uint8 *remap = GetNonSprite(pal, ST_RECOLOUR) + 1;
    do {
      for (int i = 0; i != width; i++) {
        *anim = remap[*anim];
        anim++;
      }
      anim = anim - width + _screen.pitch;
    } while (--height);
  }
}
 
Sprite *Blitter_40bppAnim::Encode(const SpriteLoader::Sprite *sprite, AllocatorProc *allocator)
{
  return this->EncodeInternal<false>(sprite, allocator);
}
 
 
void Blitter_40bppAnim::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;
  const uint32 *usrc = (const uint32 *)src;
 
  uint8 *anim_buf = VideoDriver::GetInstance()->GetAnimBuffer();
  if (anim_buf == nullptr) return;
  uint8 *anim_line = ((uint32 *)video - (uint32 *)_screen.dst_ptr) + anim_buf;
 
  for (; height > 0; height--) {
    memcpy(dst, usrc, width * sizeof(uint32));
    usrc += width;
    dst += _screen.pitch;
    /* Copy back the anim-buffer */
    memcpy(anim_line, usrc, width * sizeof(uint8));
    usrc = (const uint32 *)((const uint8 *)usrc + width);
    anim_line += _screen.pitch;
  }
}
 
void Blitter_40bppAnim::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;
  const uint32 *src = (const uint32 *)video;
 
  uint8 *anim_buf = VideoDriver::GetInstance()->GetAnimBuffer();
  if (anim_buf == nullptr) return;
  const uint8 *anim_line = ((const uint32 *)video - (uint32 *)_screen.dst_ptr) + 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 += _screen.pitch;
  }
}
 
void Blitter_40bppAnim::CopyImageToBuffer(const void *video, void *dst, int width, int height, int dst_pitch)
{
  uint8 *anim_buf = VideoDriver::GetInstance()->GetAnimBuffer();
  if (anim_buf == nullptr) {
    Blitter_32bppOptimized::CopyImageToBuffer(video, dst, width, height, dst_pitch);
    return;
  }
 
  uint32 *udst = (uint32 *)dst;
  const uint32 *src = (const uint32 *)video;
  const uint8 *anim_line = ((const uint32 *)video - (uint32 *)_screen.dst_ptr) + anim_buf;
 
  for (; height > 0; height--) {
    for (int x = 0; x < width; x++) {
      udst[x] = this->RealizeBlendedColour(anim_line[x], src[x]).data;
    }
    src += _screen.pitch;
    anim_line += _screen.pitch;
    udst += dst_pitch;
  }
}
 
void Blitter_40bppAnim::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 *anim_buf = VideoDriver::GetInstance()->GetAnimBuffer();
  uint8 *dst, *src;
 
  /* We need to scroll the anim-buffer too */
  if (scroll_y > 0) {
    dst = anim_buf + left + (top + height - 1) * _screen.pitch;
    src = dst - scroll_y * _screen.pitch;
 
    /* 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 -= _screen.pitch;
      dst -= _screen.pitch;
    }
  } else {
    /* Calculate pointers */
    dst = anim_buf + left + top * _screen.pitch;
    src = dst - scroll_y * _screen.pitch;
 
    /* 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 += _screen.pitch;
      dst += _screen.pitch;
    }
  }
 
  Blitter_32bppBase::ScrollBuffer(video, left, top, width, height, scroll_x, scroll_y);
}
 
int Blitter_40bppAnim::BufferSize(int width, int height)
{
  return width * height * (sizeof(uint32) + sizeof(uint8));
}
 
Blitter::PaletteAnimation Blitter_40bppAnim::UsePaletteAnimation()
{
  return Blitter::PALETTE_ANIMATION_VIDEO_BACKEND;
}
 
bool Blitter_40bppAnim::NeedsAnimationBuffer()
{
  return true;
}