DrawTexturePro draws nothing when destRec.width is negative

[SpaceSoarer90]

#include <raylib.h>
#include <raymath.h>

int main() {
  InitWindow(800, 600, "the c version");
  SetTargetFPS(60);

  Rectangle stencil = {0, 0, 16, 16};
  Rectangle destRec = {0, 0, -64, 64};
  Texture2D image   = LoadTexture("mario.png");

  const char *instructions[] = {
    "WASD to move the texture around",
    "UDLR to stretch the image",
    "H    to flip horizontally (change sign of stencil.width)",
    "V    to flip vertically   (change sign of stencil.height)"
  };

  while (!WindowShouldClose()) {
    if (IsKeyDown(KEY_W))
      destRec.y--;
    else if (IsKeyDown(KEY_S))
      destRec.y++;

    if (IsKeyDown(KEY_A))
      destRec.x--;
    else if (IsKeyDown(KEY_D))
      destRec.x++;

    if (IsKeyDown(KEY_UP))
      destRec.height--;
    else if (IsKeyDown(KEY_DOWN))
      destRec.height++;

    if (IsKeyDown(KEY_LEFT))
      destRec.width--;
    else if (IsKeyDown(KEY_RIGHT))
      destRec.width++;

    if (IsKeyPressed(KEY_H))
      destRec.width = -destRec.width;
    if (IsKeyPressed(KEY_V))
      destRec.height = -destRec.height;

    BeginDrawing();
      ClearBackground(RAYWHITE);
      for (int i = 0; i < sizeof(instructions) / sizeof(instructions[0]); i++) {
        int textsize = 20;
        DrawText(instructions[i], 0, textsize * i, textsize, BLUE);
      }
      DrawTexturePro(image, stencil, destRec, Vector2Zero(), 0.0, WHITE);
    EndDrawing();

  }

  CloseWindow();
}

whenever i press the H key that should just flip the image right?

i just instead see this

before pressing H:

after pressing H:

[Peter0x44]

To flip a texture, you should pass a source rectangle with a negative width, not the dest rectangle.

See: https://github.com/raysan5/raylib/wiki/Frequently-Asked-Questions#how-can-i-draw-a-texture-flipped for how to do it properly
That is API misuse.

"H    to flip horizontally (change sign of stencil.width)",
"V    to flip vertically   (change sign of stencil.height)"

This is the correct thing to do, so I'm not sure why you aren't doing it.

[SpaceSoarer90]

yes, thank you. i realized my mistake.