screenshot_utils.cc

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#include "app/service/screenshot_utils.h"
 
#ifdef YAZE_WITH_GRPC
 
#include "app/platform/sdl_compat.h"
 
// Undefine Windows macros that conflict with protobuf generated code
// SDL.h includes Windows.h on Windows, which defines these macros
#ifdef _WIN32
#ifdef DWORD
#undef DWORD
#endif
#ifdef ERROR
#undef ERROR
#endif
#ifdef OVERFLOW
#undef OVERFLOW
#endif
#ifdef IGNORE
#undef IGNORE
#endif
#endif  // _WIN32
 
#include <filesystem>
#include <string>
 
#include "absl/status/status.h"
#include "absl/status/statusor.h"
#include "absl/strings/str_format.h"
#include "absl/time/clock.h"
#include "imgui.h"
#include "imgui_internal.h"
 
namespace yaze {
namespace test {
 
namespace {
 
struct ImGui_ImplSDLRenderer2_Data {
  SDL_Renderer* Renderer;
};
 
std::filesystem::path DefaultScreenshotPath() {
  std::filesystem::path base_dir =
      std::filesystem::temp_directory_path() / "yaze" / "test-results";
  std::error_code ec;
  std::filesystem::create_directories(base_dir, ec);
 
  const int64_t timestamp_ms = absl::ToUnixMillis(absl::Now());
  return base_dir /
         std::filesystem::path(absl::StrFormat(
             "harness_%lld.bmp", static_cast<long long>(timestamp_ms)));
}
 
}  // namespace
 
absl::StatusOr<ScreenshotArtifact> CaptureHarnessScreenshot(
    const std::string& preferred_path) {
  ImGuiIO& io = ImGui::GetIO();
  auto* backend_data =
      static_cast<ImGui_ImplSDLRenderer2_Data*>(io.BackendRendererUserData);
 
  if (!backend_data || !backend_data->Renderer) {
    return absl::FailedPreconditionError("SDL renderer not available");
  }
 
  SDL_Renderer* renderer = backend_data->Renderer;
  int width = 0;
  int height = 0;
  if (platform::GetRendererOutputSize(renderer, &width, &height) != 0) {
    return absl::InternalError(
        absl::StrFormat("Failed to get renderer size: %s", SDL_GetError()));
  }
 
  std::filesystem::path output_path =
      preferred_path.empty() ? DefaultScreenshotPath()
                             : std::filesystem::path(preferred_path);
  if (output_path.has_parent_path()) {
    std::error_code ec;
    std::filesystem::create_directories(output_path.parent_path(), ec);
  }
 
  SDL_Surface* surface = platform::ReadPixelsToSurface(renderer, width, height, nullptr);
  if (!surface) {
    return absl::InternalError(
        absl::StrFormat("Failed to read pixels to surface: %s", SDL_GetError()));
  }
 
  if (SDL_SaveBMP(surface, output_path.string().c_str()) != 0) {
    platform::DestroySurface(surface);
    return absl::InternalError(
        absl::StrFormat("Failed to save BMP: %s", SDL_GetError()));
  }
 
  platform::DestroySurface(surface);
 
  std::error_code ec;
  const int64_t file_size = std::filesystem::file_size(output_path, ec);
  if (ec) {
    return absl::InternalError(
        absl::StrFormat("Failed to stat screenshot %s: %s",
                        output_path.string(), ec.message()));
  }
 
  ScreenshotArtifact artifact;
  artifact.file_path = output_path.string();
  artifact.width = width;
  artifact.height = height;
  artifact.file_size_bytes = file_size;
  return artifact;
}
 
absl::StatusOr<ScreenshotArtifact> CaptureHarnessScreenshotRegion(
    const std::optional<CaptureRegion>& region,
    const std::string& preferred_path) {
  ImGuiIO& io = ImGui::GetIO();
  auto* backend_data =
      static_cast<ImGui_ImplSDLRenderer2_Data*>(io.BackendRendererUserData);
 
  if (!backend_data || !backend_data->Renderer) {
    return absl::FailedPreconditionError("SDL renderer not available");
  }
 
  SDL_Renderer* renderer = backend_data->Renderer;
 
  // Get full renderer size
  int full_width = 0;
  int full_height = 0;
  if (platform::GetRendererOutputSize(renderer, &full_width, &full_height) != 0) {
    return absl::InternalError(
        absl::StrFormat("Failed to get renderer size: %s", SDL_GetError()));
  }
 
  // Determine capture region
  int capture_x = 0;
  int capture_y = 0;
  int capture_width = full_width;
  int capture_height = full_height;
 
  if (region.has_value()) {
    capture_x = region->x;
    capture_y = region->y;
    capture_width = region->width;
    capture_height = region->height;
 
    // Clamp to renderer bounds
    if (capture_x < 0)
      capture_x = 0;
    if (capture_y < 0)
      capture_y = 0;
    if (capture_x + capture_width > full_width) {
      capture_width = full_width - capture_x;
    }
    if (capture_y + capture_height > full_height) {
      capture_height = full_height - capture_y;
    }
 
    if (capture_width <= 0 || capture_height <= 0) {
      return absl::InvalidArgumentError("Invalid capture region");
    }
  }
 
  std::filesystem::path output_path =
      preferred_path.empty() ? DefaultScreenshotPath()
                             : std::filesystem::path(preferred_path);
  if (output_path.has_parent_path()) {
    std::error_code ec;
    std::filesystem::create_directories(output_path.parent_path(), ec);
  }
 
  // Read pixels from the specified region
  SDL_Rect region_rect = {capture_x, capture_y, capture_width, capture_height};
  SDL_Surface* surface = platform::ReadPixelsToSurface(renderer, capture_width, capture_height, &region_rect);
  
  if (!surface) {
    return absl::InternalError(
        absl::StrFormat("Failed to read pixels to surface: %s", SDL_GetError()));
  }
 
  if (SDL_SaveBMP(surface, output_path.string().c_str()) != 0) {
    platform::DestroySurface(surface);
    return absl::InternalError(
        absl::StrFormat("Failed to save BMP: %s", SDL_GetError()));
  }
 
  platform::DestroySurface(surface);
 
  std::error_code ec;
  const int64_t file_size = std::filesystem::file_size(output_path, ec);
  if (ec) {
    return absl::InternalError(
        absl::StrFormat("Failed to stat screenshot %s: %s",
                        output_path.string(), ec.message()));
  }
 
  ScreenshotArtifact artifact;
  artifact.file_path = output_path.string();
  artifact.width = capture_width;
  artifact.height = capture_height;
  artifact.file_size_bytes = file_size;
  return artifact;
}
 
absl::StatusOr<ScreenshotArtifact> CaptureActiveWindow(
    const std::string& preferred_path) {
  ImGuiContext* ctx = ImGui::GetCurrentContext();
  if (!ctx || !ctx->NavWindow) {
    return absl::FailedPreconditionError("No active ImGui window");
  }
 
  ImGuiWindow* window = ctx->NavWindow;
  CaptureRegion region;
  region.x = static_cast<int>(window->Pos.x);
  region.y = static_cast<int>(window->Pos.y);
  region.width = static_cast<int>(window->Size.x);
  region.height = static_cast<int>(window->Size.y);
 
  return CaptureHarnessScreenshotRegion(region, preferred_path);
}
 
absl::StatusOr<ScreenshotArtifact> CaptureWindowByName(
    const std::string& window_name, const std::string& preferred_path) {
  ImGuiContext* ctx = ImGui::GetCurrentContext();
  if (!ctx) {
    return absl::FailedPreconditionError("No ImGui context");
  }
 
  ImGuiWindow* window = ImGui::FindWindowByName(window_name.c_str());
  if (!window) {
    return absl::NotFoundError(
        absl::StrFormat("Window '%s' not found", window_name));
  }
 
  CaptureRegion region;
  region.x = static_cast<int>(window->Pos.x);
  region.y = static_cast<int>(window->Pos.y);
  region.width = static_cast<int>(window->Size.x);
  region.height = static_cast<int>(window->Size.y);
 
  return CaptureHarnessScreenshotRegion(region, preferred_path);
}
 
}  // namespace test
}  // namespace yaze
 
#endif  // YAZE_WITH_GRPC