screenshot.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 "core/backup_type.hpp"
#include "fileio_func.h"
#include "viewport_func.h"
#include "gfx_func.h"
#include "screenshot.h"
#include "screenshot_gui.h"
#include "blitter/factory.hpp"
#include "zoom_func.h"
#include "saveload/saveload.h"
#include "company_func.h"
#include "strings_func.h"
#include "error.h"
#include "textbuf_gui.h"
#include "window_gui.h"
#include "window_func.h"
#include "tile_map.h"
#include "landscape.h"
#include "video/video_driver.hpp"
#include "smallmap_gui.h"
#include "screenshot_type.h"
 
#include "table/strings.h"
 
#include "safeguards.h"
 
static const char * const SCREENSHOT_NAME = "screenshot"; 
static const char * const HEIGHTMAP_NAME  = "heightmap";  
 
std::string _screenshot_format_name;  
static std::string _screenshot_name;  
std::string _full_screenshot_path;    
uint _heightmap_highest_peak;         
 
static ScreenshotProvider *GetScreenshotProvider()
{
  auto providers = ProviderManager<ScreenshotProvider>::GetProviders();
  if (providers.empty()) return nullptr;
 
  auto it = std::ranges::find_if(providers, [](const auto &p) { return p->GetName() == _screenshot_format_name; });
  if (it != std::end(providers)) return *it;
 
  return providers.front();
}
 
std::string_view GetCurrentScreenshotExtension()
{
  auto provider = GetScreenshotProvider();
  if (provider == nullptr) return {};
 
  return provider->GetName();
}
 
static void CurrentScreenCallback(void *, void *buf, uint y, uint pitch, uint n)
{
  Blitter *blitter = BlitterFactory::GetCurrentBlitter();
  void *src = blitter->MoveTo(_screen.dst_ptr, 0, y);
  blitter->CopyImageToBuffer(src, buf, _screen.width, n, pitch);
}
 
static void LargeWorldCallback(void *userdata, void *buf, uint y, uint pitch, uint n)
{
  Viewport *vp = (Viewport *)userdata;
  DrawPixelInfo dpi;
  int wx, left;
 
  /* We are no longer rendering to the screen */
  DrawPixelInfo old_screen = _screen;
  bool old_disable_anim = _screen_disable_anim;
 
  _screen.dst_ptr = buf;
  _screen.width = pitch;
  _screen.height = n;
  _screen.pitch = pitch;
  _screen_disable_anim = true;
 
  AutoRestoreBackup dpi_backup(_cur_dpi, &dpi);
 
  dpi.dst_ptr = buf;
  dpi.height = n;
  dpi.width = vp->width;
  dpi.pitch = pitch;
  dpi.zoom = ZOOM_LVL_WORLD_SCREENSHOT;
  dpi.left = 0;
  dpi.top = y;
 
  /* Render viewport in blocks of 1600 pixels width */
  left = 0;
  while (vp->width - left != 0) {
    wx = std::min(vp->width - left, 1600);
    left += wx;
 
    ViewportDoDraw(*vp,
      ScaleByZoom(left - wx - vp->left, vp->zoom) + vp->virtual_left,
      ScaleByZoom(y - vp->top, vp->zoom) + vp->virtual_top,
      ScaleByZoom(left - vp->left, vp->zoom) + vp->virtual_left,
      ScaleByZoom((y + n) - vp->top, vp->zoom) + vp->virtual_top
    );
  }
 
  /* Switch back to rendering to the screen */
  _screen = old_screen;
  _screen_disable_anim = old_disable_anim;
}
 
static const char *MakeScreenshotName(std::string_view default_fn, std::string_view ext, bool crashlog = false)
{
  bool generate = _screenshot_name.empty();
 
  if (generate) {
    if (_game_mode == GM_EDITOR || _game_mode == GM_MENU || _local_company == COMPANY_SPECTATOR) {
      _screenshot_name = default_fn;
    } else {
      _screenshot_name = GenerateDefaultSaveName();
    }
  }
 
  /* Handle user-specified filenames ending in # with automatic numbering */
  if (_screenshot_name.ends_with("#")) {
    generate = true;
    _screenshot_name.pop_back();
  }
 
  size_t len = _screenshot_name.size();
  /* Add extension to screenshot file */
  _screenshot_name += fmt::format(".{}", ext);
 
  const char *screenshot_dir = crashlog ? _personal_dir.c_str() : FiosGetScreenshotDir();
 
  for (uint serial = 1;; serial++) {
    _full_screenshot_path = fmt::format("{}{}", screenshot_dir, _screenshot_name);
 
    if (!generate) break; // allow overwriting of non-automatic filenames
    if (!FileExists(_full_screenshot_path)) break;
    /* If file exists try another one with same name, but just with a higher index */
    _screenshot_name.erase(len);
    _screenshot_name += fmt::format("#{}.{}", serial, ext);
  }
 
  return _full_screenshot_path.c_str();
}
 
static bool MakeSmallScreenshot(bool crashlog)
{
  auto provider = GetScreenshotProvider();
  if (provider == nullptr) return false;
 
  return provider->MakeImage(MakeScreenshotName(SCREENSHOT_NAME, provider->GetName(), crashlog), CurrentScreenCallback, nullptr, _screen.width, _screen.height,
      BlitterFactory::GetCurrentBlitter()->GetScreenDepth(), _cur_palette.palette);
}
 
static Viewport SetupScreenshotViewport(ScreenshotType t, uint32_t width = 0, uint32_t height = 0)
{
  Viewport vp{};
 
  switch(t) {
    case SC_VIEWPORT:
    case SC_CRASHLOG: {
      assert(width == 0 && height == 0);
 
      Window *w = GetMainWindow();
      vp.virtual_left   = w->viewport->virtual_left;
      vp.virtual_top    = w->viewport->virtual_top;
      vp.virtual_width  = w->viewport->virtual_width;
      vp.virtual_height = w->viewport->virtual_height;
 
      /* Compute pixel coordinates */
      vp.left = 0;
      vp.top = 0;
      vp.width = _screen.width;
      vp.height = _screen.height;
      vp.overlay = w->viewport->overlay;
      break;
    }
    case SC_WORLD: {
      assert(width == 0 && height == 0);
 
      /* Determine world coordinates of screenshot */
      vp.zoom = ZOOM_LVL_WORLD_SCREENSHOT;
 
      TileIndex north_tile = _settings_game.construction.freeform_edges ? TileXY(1, 1) : TileXY(0, 0);
      TileIndex south_tile{Map::Size() - 1};
 
      /* We need to account for a hill or high building at tile 0,0. */
      int extra_height_top = TilePixelHeight(north_tile) + 150;
      /* If there is a hill at the bottom don't create a large black area. */
      int reclaim_height_bottom = TilePixelHeight(south_tile);
 
      vp.virtual_left   = RemapCoords(TileX(south_tile) * TILE_SIZE, TileY(north_tile) * TILE_SIZE, 0).x;
      vp.virtual_top    = RemapCoords(TileX(north_tile) * TILE_SIZE, TileY(north_tile) * TILE_SIZE, extra_height_top).y;
      vp.virtual_width  = RemapCoords(TileX(north_tile) * TILE_SIZE, TileY(south_tile) * TILE_SIZE, 0).x                     - vp.virtual_left + 1;
      vp.virtual_height = RemapCoords(TileX(south_tile) * TILE_SIZE, TileY(south_tile) * TILE_SIZE, reclaim_height_bottom).y - vp.virtual_top  + 1;
 
      /* Compute pixel coordinates */
      vp.left = 0;
      vp.top = 0;
      vp.width  = UnScaleByZoom(vp.virtual_width,  vp.zoom);
      vp.height = UnScaleByZoom(vp.virtual_height, vp.zoom);
      vp.overlay = nullptr;
      break;
    }
    default: {
      vp.zoom = (t == SC_ZOOMEDIN) ? _settings_client.gui.zoom_min : ZOOM_LVL_VIEWPORT;
 
      Window *w = GetMainWindow();
      vp.virtual_left   = w->viewport->virtual_left;
      vp.virtual_top    = w->viewport->virtual_top;
 
      if (width == 0 || height == 0) {
        vp.virtual_width  = w->viewport->virtual_width;
        vp.virtual_height = w->viewport->virtual_height;
      } else {
        vp.virtual_width = width << vp.zoom;
        vp.virtual_height = height << vp.zoom;
      }
 
      /* Compute pixel coordinates */
      vp.left = 0;
      vp.top = 0;
      vp.width  = UnScaleByZoom(vp.virtual_width,  vp.zoom);
      vp.height = UnScaleByZoom(vp.virtual_height, vp.zoom);
      vp.overlay = nullptr;
      break;
    }
  }
 
  return vp;
}
 
static bool MakeLargeWorldScreenshot(ScreenshotType t, uint32_t width = 0, uint32_t height = 0)
{
  auto provider = GetScreenshotProvider();
  if (provider == nullptr) return false;
 
  Viewport vp = SetupScreenshotViewport(t, width, height);
 
  return provider->MakeImage(MakeScreenshotName(SCREENSHOT_NAME, provider->GetName()), LargeWorldCallback, &vp, vp.width, vp.height,
      BlitterFactory::GetCurrentBlitter()->GetScreenDepth(), _cur_palette.palette);
}
 
static void HeightmapCallback(void *, void *buffer, uint y, uint, uint n)
{
  uint8_t *buf = (uint8_t *)buffer;
  while (n > 0) {
    TileIndex ti = TileXY(Map::MaxX(), y);
    for (uint x = Map::MaxX(); true; x--) {
      *buf = 256 * TileHeight(ti) / (1 + _heightmap_highest_peak);
      buf++;
      if (x == 0) break;
      ti = TileAddXY(ti, -1, 0);
    }
    y++;
    n--;
  }
}
 
bool MakeHeightmapScreenshot(const char *filename)
{
  auto provider = GetScreenshotProvider();
  if (provider == nullptr) return false;
 
  Colour palette[256];
  for (uint i = 0; i < lengthof(palette); i++) {
    palette[i].a = 0xff;
    palette[i].r = i;
    palette[i].g = i;
    palette[i].b = i;
  }
 
  _heightmap_highest_peak = 0;
  for (const auto tile : Map::Iterate()) {
    uint h = TileHeight(tile);
    _heightmap_highest_peak = std::max(h, _heightmap_highest_peak);
  }
 
  return provider->MakeImage(filename, HeightmapCallback, nullptr, Map::SizeX(), Map::SizeY(), 8, palette);
}
 
static ScreenshotType _confirmed_screenshot_type; 
 
static void ScreenshotConfirmationCallback(Window *, bool confirmed)
{
  if (confirmed) MakeScreenshot(_confirmed_screenshot_type, {});
}
 
void MakeScreenshotWithConfirm(ScreenshotType t)
{
  Viewport vp = SetupScreenshotViewport(t);
 
  bool heightmap_or_minimap = t == SC_HEIGHTMAP || t == SC_MINIMAP;
  uint64_t width = (heightmap_or_minimap ? Map::SizeX() : vp.width);
  uint64_t height = (heightmap_or_minimap ? Map::SizeY() : vp.height);
 
  if (width * height > 8192 * 8192) {
    /* Ask for confirmation */
    _confirmed_screenshot_type = t;
    ShowQuery(
      GetEncodedString(STR_WARNING_SCREENSHOT_SIZE_CAPTION),
      GetEncodedString(STR_WARNING_SCREENSHOT_SIZE_MESSAGE, width, height), nullptr, ScreenshotConfirmationCallback);
  } else {
    /* Less than 64M pixels, just do it */
    MakeScreenshot(t, {});
  }
}
 
static bool RealMakeScreenshot(ScreenshotType t, const std::string &name, uint32_t width, uint32_t height)
{
  if (t == SC_VIEWPORT) {
    /* First draw the dirty parts of the screen and only then change the name
     * of the screenshot. This way the screenshot will always show the name
     * of the previous screenshot in the 'successful' message instead of the
     * name of the new screenshot (or an empty name). */
    SetScreenshotWindowVisibility(true);
    UndrawMouseCursor();
    DrawDirtyBlocks();
    SetScreenshotWindowVisibility(false);
  }
 
  _screenshot_name = name;
 
  bool ret;
  switch (t) {
    case SC_VIEWPORT:
      ret = MakeSmallScreenshot(false);
      break;
 
    case SC_CRASHLOG:
      ret = MakeSmallScreenshot(true);
      break;
 
    case SC_ZOOMEDIN:
    case SC_DEFAULTZOOM:
      ret = MakeLargeWorldScreenshot(t, width, height);
      break;
 
    case SC_WORLD:
      ret = MakeLargeWorldScreenshot(t);
      break;
 
    case SC_HEIGHTMAP: {
      auto provider = GetScreenshotProvider();
      if (provider == nullptr) {
        ret = false;
      } else {
        ret = MakeHeightmapScreenshot(MakeScreenshotName(HEIGHTMAP_NAME, provider->GetName()));
      }
      break;
    }
 
    case SC_MINIMAP:
      ret = MakeMinimapWorldScreenshot();
      break;
 
    default:
      NOT_REACHED();
  }
 
  if (ret) {
    if (t == SC_HEIGHTMAP) {
      ShowErrorMessage(GetEncodedString(STR_MESSAGE_HEIGHTMAP_SUCCESSFULLY, _screenshot_name, _heightmap_highest_peak), {}, WL_WARNING);
    } else {
      ShowErrorMessage(GetEncodedString(STR_MESSAGE_SCREENSHOT_SUCCESSFULLY, _screenshot_name), {}, WL_WARNING);
    }
  } else {
    ShowErrorMessage(GetEncodedString(STR_ERROR_SCREENSHOT_FAILED), {}, WL_ERROR);
  }
 
  return ret;
}
 
bool MakeScreenshot(ScreenshotType t, const std::string &name, uint32_t width, uint32_t height)
{
  if (t == SC_CRASHLOG) {
    /* Video buffer might or might not be locked. */
    VideoDriver::VideoBufferLocker lock;
 
    return RealMakeScreenshot(t, name, width, height);
  }
 
  VideoDriver::GetInstance()->QueueOnMainThread([=] { // Capture by value to not break scope.
    RealMakeScreenshot(t, name, width, height);
  });
 
  return true;
}
 
 
static void MinimapScreenCallback(void *, void *buf, uint y, uint pitch, uint n)
{
  uint32_t *ubuf = (uint32_t *)buf;
  uint num = (pitch * n);
  for (uint i = 0; i < num; i++) {
    uint row = y + (int)(i / pitch);
    uint col = (Map::SizeX() - 1) - (i % pitch);
 
    TileIndex tile = TileXY(col, row);
    uint8_t val = GetSmallMapOwnerPixels(tile, GetTileType(tile), IncludeHeightmap::Never) & 0xFF;
 
    uint32_t colour_buf = 0;
    colour_buf  = (_cur_palette.palette[val].b << 0);
    colour_buf |= (_cur_palette.palette[val].g << 8);
    colour_buf |= (_cur_palette.palette[val].r << 16);
 
    *ubuf = colour_buf;
    ubuf++;   // Skip alpha
  }
}
 
bool MakeMinimapWorldScreenshot()
{
  auto provider = GetScreenshotProvider();
  if (provider == nullptr) return false;
 
  return provider->MakeImage(MakeScreenshotName(SCREENSHOT_NAME, provider->GetName()), MinimapScreenCallback, nullptr, Map::SizeX(), Map::SizeY(), 32, _cur_palette.palette);
}