SDL2/dialogs/sdl_widget.cpp

 
#include <cassert>
#include <cstdio>
#include <cstdlib>
#include <algorithm>
 
#include <SDL.h>
#include <SDL_ttf.h>
 
#include "sdl_widget.hpp"
#include "../sdl_utils.hpp"
 
#include "res/sdl2_resource_manager.hpp"
 
#include <freerdp/log.h>
 
#if defined(WITH_SDL_IMAGE_DIALOGS)
#include <SDL_image.h>
#endif
 
#define TAG CLIENT_TAG("SDL.widget")
 
static const SDL_Color backgroundcolor = { 0x38, 0x36, 0x35, 0xff };
 
static const Uint32 hpadding = 10;
 
SdlWidget::SdlWidget(SDL_Renderer* renderer, SDL_Rect rect, bool input) : _rect(rect), _input(input)
{
  assert(renderer);
 
  auto ops = SDL2ResourceManager::get(SDLResourceManager::typeFonts(),
                                      "OpenSans-VariableFont_wdth,wght.ttf");
  if (!ops)
    widget_log_error(-1, "SDLResourceManager::get");
  else
  {
    _font = TTF_OpenFontRW(ops, 1, 64);
    if (!_font)
      widget_log_error(-1, "TTF_OpenFontRW");
  }
}
 
#if defined(WITH_SDL_IMAGE_DIALOGS)
SdlWidget::SdlWidget(SDL_Renderer* renderer, SDL_Rect rect, SDL_RWops* ops) : _rect(rect)
{
  if (ops)
  {
    _image = IMG_LoadTexture_RW(renderer, ops, 1);
    if (!_image)
      widget_log_error(-1, "IMG_LoadTextureTyped_RW");
  }
}
#endif
 
SdlWidget::SdlWidget(SdlWidget&& other) noexcept
    : _font(other._font), _image(other._image), _rect(other._rect), _input(other._input),
      _wrap(other._wrap), _text_width(other._text_width)
{
  other._font = nullptr;
  other._image = nullptr;
}
 
SDL_Texture* SdlWidget::render_text(SDL_Renderer* renderer, const std::string& text,
                                    SDL_Color fgcolor, SDL_Rect& src, SDL_Rect& dst)
{
  auto surface = TTF_RenderUTF8_Blended(_font, text.c_str(), fgcolor);
  if (!surface)
  {
    widget_log_error(-1, "TTF_RenderText_Blended");
    return nullptr;
  }
 
  auto texture = SDL_CreateTextureFromSurface(renderer, surface);
  SDL_FreeSurface(surface);
  if (!texture)
  {
    widget_log_error(-1, "SDL_CreateTextureFromSurface");
    return nullptr;
  }
 
  TTF_SizeUTF8(_font, text.c_str(), &src.w, &src.h);
 
  /* Do some magic:
   * - Add padding before and after text
   * - if text is too long only show the last elements
   * - if text is too short only update used space
   */
  dst = _rect;
  dst.x += hpadding;
  dst.w -= 2 * hpadding;
  const auto scale = static_cast<float>(dst.h) / static_cast<float>(src.h);
  const auto sws = static_cast<float>(src.w) * scale;
  const auto dws = static_cast<float>(dst.w) / scale;
  if (static_cast<float>(dst.w) > sws)
    dst.w = static_cast<int>(sws);
  if (static_cast<float>(src.w) > dws)
  {
    src.x = src.w - static_cast<int>(dws);
    src.w = static_cast<int>(dws);
  }
  return texture;
}
 
static int scale(int w, int h)
{
  const auto dw = static_cast<double>(w);
  const auto dh = static_cast<double>(h);
  const auto scale = dh / dw;
  const auto dr = dh * scale;
  return static_cast<int>(dr);
}
 
SDL_Texture* SdlWidget::render_text_wrapped(SDL_Renderer* renderer, const std::string& text,
                                            SDL_Color fgcolor, SDL_Rect& src, SDL_Rect& dst)
{
  Sint32 w = 0;
  Sint32 h = 0;
  TTF_SizeUTF8(_font, " ", &w, &h);
 
  assert(_text_width <= UINT32_MAX);
  auto surface = TTF_RenderUTF8_Blended_Wrapped(_font, text.c_str(), fgcolor,
                                                static_cast<Uint32>(_text_width));
  if (!surface)
  {
    widget_log_error(-1, "TTF_RenderText_Blended");
    return nullptr;
  }
 
  src.w = surface->w;
  src.h = surface->h;
 
  auto texture = SDL_CreateTextureFromSurface(renderer, surface);
  SDL_FreeSurface(surface);
  if (!texture)
  {
    widget_log_error(-1, "SDL_CreateTextureFromSurface");
    return nullptr;
  }
 
  /* Do some magic:
   * - Add padding before and after text
   * - if text is too long only show the last elements
   * - if text is too short only update used space
   */
  dst = _rect;
  dst.x += hpadding;
  dst.w -= 2 * hpadding;
  auto dh = scale(src.w, src.h);
  dst.h = std::min<int>(dh, dst.h);
 
  return texture;
}
 
SdlWidget::~SdlWidget()
{
  TTF_CloseFont(_font);
  if (_image)
    SDL_DestroyTexture(_image);
}
 
bool SdlWidget::error_ex(Sint32 res, const char* what, const char* file, size_t line,
                         const char* fkt)
{
  static wLog* log = nullptr;
  if (!log)
    log = WLog_Get(TAG);
  return sdl_log_error_ex(res, log, what, file, line, fkt);
}
 
static bool draw_rect(SDL_Renderer* renderer, const SDL_Rect* rect, SDL_Color color)
{
  const int drc = SDL_SetRenderDrawColor(renderer, color.r, color.g, color.b, color.a);
  if (widget_log_error(drc, "SDL_SetRenderDrawColor"))
    return false;
 
  const int rc = SDL_RenderFillRect(renderer, rect);
  return !widget_log_error(rc, "SDL_RenderFillRect");
}
 
bool SdlWidget::fill(SDL_Renderer* renderer, SDL_Color color)
{
  std::vector<SDL_Color> colors = { color };
  return fill(renderer, colors);
}
 
bool SdlWidget::fill(SDL_Renderer* renderer, const std::vector<SDL_Color>& colors)
{
  assert(renderer);
  SDL_BlendMode mode = SDL_BLENDMODE_INVALID;
  SDL_GetRenderDrawBlendMode(renderer, &mode);
  SDL_SetRenderDrawBlendMode(renderer, SDL_BLENDMODE_NONE);
  for (auto color : colors)
  {
    draw_rect(renderer, &_rect, color);
    SDL_SetRenderDrawBlendMode(renderer, SDL_BLENDMODE_ADD);
  }
  SDL_SetRenderDrawBlendMode(renderer, mode);
  return true;
}
 
bool SdlWidget::update_text(SDL_Renderer* renderer, const std::string& text, SDL_Color fgcolor,
                            SDL_Color bgcolor)
{
  assert(renderer);
 
  if (!fill(renderer, bgcolor))
    return false;
  return update_text(renderer, text, fgcolor);
}
 
bool SdlWidget::wrap() const
{
  return _wrap;
}
 
bool SdlWidget::set_wrap(bool wrap, size_t width)
{
  _wrap = wrap;
  _text_width = width;
  return _wrap;
}
 
const SDL_Rect& SdlWidget::rect() const
{
  return _rect;
}
 
bool SdlWidget::update_text(SDL_Renderer* renderer, const std::string& text, SDL_Color fgcolor)
{
 
  if (text.empty())
    return true;
 
  SDL_Rect src{};
  SDL_Rect dst{};
 
  SDL_Texture* texture = nullptr;
  if (_image)
  {
    texture = _image;
    dst = _rect;
    auto rc = SDL_QueryTexture(_image, nullptr, nullptr, &src.w, &src.h);
    if (rc < 0)
      widget_log_error(rc, "SDL_QueryTexture");
  }
  else if (_wrap)
    texture = render_text_wrapped(renderer, text, fgcolor, src, dst);
  else
    texture = render_text(renderer, text, fgcolor, src, dst);
  if (!texture)
    return false;
 
  const int rc = SDL_RenderCopy(renderer, texture, &src, &dst);
  if (!_image)
    SDL_DestroyTexture(texture);
  if (rc < 0)
    return !widget_log_error(rc, "SDL_RenderCopy");
  return true;
}
 
bool clear_window(SDL_Renderer* renderer)
{
  assert(renderer);
 
  const int drc = SDL_SetRenderDrawColor(renderer, backgroundcolor.r, backgroundcolor.g,
                                         backgroundcolor.b, backgroundcolor.a);
  if (widget_log_error(drc, "SDL_SetRenderDrawColor"))
    return false;
 
  const int rcls = SDL_RenderClear(renderer);
  return !widget_log_error(rcls, "SDL_RenderClear");
}