32bpp_anim.cpp

/* $Id: 32bpp_anim.cpp 11828 2008-01-13 01:21:35Z rubidium $ */

#include "../stdafx.h"
#include "../core/alloc_func.hpp"
#include "../gfx_func.h"
#include "../zoom_func.h"
#include "../debug.h"
#include "../video/video_driver.hpp"
#include "32bpp_anim.hpp"

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

static FBlitter_32bppAnim iFBlitter_32bppAnim;

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;
  }

  const SpriteLoader::CommonPixel *src, *src_line;
  uint32 *dst, *dst_line;
  uint8 *anim, *anim_line;

  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;
  }

  /* Find where to start reading in the source sprite */
  src_line = (const SpriteLoader::CommonPixel *)bp->sprite + (bp->skip_top * bp->sprite_width + bp->skip_left) * ScaleByZoom(1, zoom);
  dst_line = (uint32 *)bp->dst + bp->top * bp->pitch + bp->left;
  anim_line = this->anim_buf + ((uint32 *)bp->dst - (uint32 *)_screen.dst_ptr) + bp->top * this->anim_buf_width + bp->left;

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

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

    anim = anim_line;
    anim_line += this->anim_buf_width;

    for (int x = 0; x < bp->width; x++) {
      if (src->a == 0) {
        /* src->r is 'misused' here to indicate how much more pixels are following with an alpha of 0 */
        int skip = UnScaleByZoom(src->r, zoom);

        dst  += skip;
        anim += skip;
        x    += skip - 1;
        src  += ScaleByZoom(1, zoom) * skip;
        continue;
      }

      switch (mode) {
        case BM_COLOUR_REMAP:
          /* In case the m-channel is zero, do not remap this pixel in any way */
          if (src->m == 0) {
            *dst = ComposeColourRGBA(src->r, src->g, src->b, src->a, *dst);
            *anim = 0;
          } else {
            if (bp->remap[src->m] != 0) {
              *dst = ComposeColourPA(this->LookupColourInPalette(bp->remap[src->m]), src->a, *dst);
              *anim = bp->remap[src->m];
            }
          }
          break;

        case BM_TRANSPARENT:
          /* TODO -- We make an assumption here that the remap in fact is transparency, not some color.
           *  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 color a bit more black, so it looks like this image is transparent */
          *dst = MakeTransparent(*dst, 192);
          *anim = bp->remap[*anim];
          break;

        default:
          /* Above 217 is palette animation */
          if (src->m >= 217) *dst = ComposeColourPA(this->LookupColourInPalette(src->m), src->a, *dst);
          else               *dst = ComposeColourRGBA(src->r, src->g, src->b, src->a, *dst);
          *anim = src->m;
          break;
      }
      dst++;
      anim++;
      src += ScaleByZoom(1, zoom);
    }
  }
}

void Blitter_32bppAnim::DrawColorMappingRect(void *dst, int width, int height, int 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 DrawColorMappingRect() */
    Blitter_32bppOptimized::DrawColorMappingRect(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 color table ('%d')", pal);
}

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

  /* Set the color 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] = color;
}

void Blitter_32bppAnim::SetPixelIfEmpty(void *video, int x, int y, uint8 color)
{
  uint32 *dst = (uint32 *)video + x + y * _screen.pitch;
  if (*dst == 0) {
    *dst = LookupColourInPalette(color);
    /* Set the color 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] = color;
  }
}

void Blitter_32bppAnim::DrawRect(void *video, int width, int height, uint8 color)
{
  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, color);
    return;
  }

  uint32 color32 = LookupColourInPalette(color);
  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 = color32;
      /* Set the color in the anim-buffer too */
      *anim = color;
      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;

  anim_line = ((uint32 *)video - (uint32 *)_screen.dst_ptr) + this->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 = (uint32 *)((uint8 *)usrc + width);
    anim_line += this->anim_buf_width;
  }

  /* We update the palette (or the pixels that do animation) immediatly, to avoid graphical glitches */
  this->PaletteAnimate(217, _use_dos_palette ? 38 : 28);
}

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);
  uint8 *anim = this->anim_buf;

  /* Never repaint the transparency pixel */
  if (start == 0) start++;

  /* Let's walk the anim buffer and try to find the pixels */
  for (int y = 0; y < this->anim_buf_height; y++) {
    for (int x = 0; x < this->anim_buf_width; x++) {
      if (*anim >= start && *anim <= start + count) {
        /* Update this pixel */
        this->SetPixel(_screen.dst_ptr, x, y, *anim);
      }
      anim++;
    }
  }

  /* 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;
}