32bpp_base.cpp

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/*
 * 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 "32bpp_base.hpp"
#include "common.hpp"
 
#include "../safeguards.h"
 
void *Blitter_32bppBase::MoveTo(void *video, int x, int y)
{
  return (uint32_t *)video + x + y * _screen.pitch;
}
 
void Blitter_32bppBase::SetPixel(void *video, int x, int y, uint8_t colour)
{
  *((Colour *)video + x + y * _screen.pitch) = LookupColourInPalette(colour);
}
 
void Blitter_32bppBase::DrawLine(void *video, int x, int y, int x2, int y2, int screen_width, int screen_height, uint8_t colour, int width, int dash)
{
  const Colour c = LookupColourInPalette(colour);
  this->DrawLineGeneric(x, y, x2, y2, screen_width, screen_height, width, dash, [=](int x, int y) {
    *((Colour *)video + x + y * _screen.pitch) = c;
  });
}
 
void Blitter_32bppBase::DrawRect(void *video, int width, int height, uint8_t colour)
{
  Colour colour32 = LookupColourInPalette(colour);
 
  do {
    Colour *dst = (Colour *)video;
    for (int i = width; i > 0; i--) {
      *dst = colour32;
      dst++;
    }
    video = (uint32_t *)video + _screen.pitch;
  } while (--height);
}
 
void Blitter_32bppBase::CopyFromBuffer(void *video, const void *src, int width, int height)
{
  uint32_t *dst = (uint32_t *)video;
  const uint32_t *usrc = (const uint32_t *)src;
 
  for (; height > 0; height--) {
    memcpy(dst, usrc, width * sizeof(uint32_t));
    usrc += width;
    dst += _screen.pitch;
  }
}
 
void Blitter_32bppBase::CopyToBuffer(const void *video, void *dst, int width, int height)
{
  uint32_t *udst = (uint32_t *)dst;
  const uint32_t *src = (const uint32_t *)video;
 
  for (; height > 0; height--) {
    memcpy(udst, src, width * sizeof(uint32_t));
    src += _screen.pitch;
    udst += width;
  }
}
 
void Blitter_32bppBase::CopyImageToBuffer(const void *video, void *dst, int width, int height, int dst_pitch)
{
  uint32_t *udst = (uint32_t *)dst;
  const uint32_t *src = (const uint32_t *)video;
 
  for (; height > 0; height--) {
    memcpy(udst, src, width * sizeof(uint32_t));
    src += _screen.pitch;
    udst += dst_pitch;
  }
}
 
void Blitter_32bppBase::ScrollBuffer(void *video, int &left, int &top, int &width, int &height, int scroll_x, int scroll_y)
{
  const uint32_t *src;
  uint32_t *dst;
 
  if (scroll_y > 0) {
    /* Calculate pointers */
    dst = (uint32_t *)video + left + (top + height - 1) * _screen.pitch;
    src = dst - scroll_y * _screen.pitch;
 
    /* Decrease height and increase top */
    top += scroll_y;
    height -= scroll_y;
    assert(height > 0);
 
    /* Adjust left & width */
    if (scroll_x >= 0) {
      dst += scroll_x;
      left += scroll_x;
      width -= scroll_x;
    } else {
      src -= scroll_x;
      width += scroll_x;
    }
 
    for (int h = height; h > 0; h--) {
      memcpy(dst, src, width * sizeof(uint32_t));
      src -= _screen.pitch;
      dst -= _screen.pitch;
    }
  } else {
    /* Calculate pointers */
    dst = (uint32_t *)video + left + top * _screen.pitch;
    src = dst - scroll_y * _screen.pitch;
 
    /* Decrease height. (scroll_y is <=0). */
    height += scroll_y;
    assert(height > 0);
 
    /* Adjust left & width */
    if (scroll_x >= 0) {
      dst += scroll_x;
      left += scroll_x;
      width -= scroll_x;
    } else {
      src -= scroll_x;
      width += scroll_x;
    }
 
    /* the y-displacement may be 0 therefore we have to use memmove,
     * because source and destination may overlap */
    for (int h = height; h > 0; h--) {
      memmove(dst, src, width * sizeof(uint32_t));
      src += _screen.pitch;
      dst += _screen.pitch;
    }
  }
}
 
size_t Blitter_32bppBase::BufferSize(uint width, uint height)
{
  return sizeof(uint32_t) * width * height;
}
 
void Blitter_32bppBase::PaletteAnimate(const Palette &)
{
  /* By default, 32bpp doesn't have palette animation */
}
 
Colour Blitter_32bppBase::ReallyAdjustBrightness(Colour colour, uint8_t brightness)
{
  assert(DEFAULT_BRIGHTNESS == 1 << 7);
 
  uint64_t combined = (((uint64_t) colour.r) << 32) | (((uint64_t) colour.g) << 16) | ((uint64_t) colour.b);
  combined *= brightness;
 
  uint16_t r = GB(combined, 39, 9);
  uint16_t g = GB(combined, 23, 9);
  uint16_t b = GB(combined, 7, 9);
 
  if ((combined & 0x800080008000L) == 0L) {
    return Colour(r, g, b, colour.a);
  }
 
  uint16_t ob = 0;
  /* Sum overbright */
  if (r > 255) ob += r - 255;
  if (g > 255) ob += g - 255;
  if (b > 255) ob += b - 255;
 
  /* Reduce overbright strength */
  ob /= 2;
  return Colour(
    r >= 255 ? 255 : std::min(r + ob * (255 - r) / 256, 255),
    g >= 255 ? 255 : std::min(g + ob * (255 - g) / 256, 255),
    b >= 255 ? 255 : std::min(b + ob * (255 - b) / 256, 255),
    colour.a);
}
 
Blitter::PaletteAnimation Blitter_32bppBase::UsePaletteAnimation()
{
  return Blitter::PALETTE_ANIMATION_NONE;
}