CODEWITHSUNDEEP
interpolationallegro5
Giorgio Napolitano
Giorgio Napolitano

Reputation: 395

How to scale/rotate an image in high quality with Allegro 5?

The API seems to provide only al_draw_scaled_bitmap or al_draw_rotated_bitmap and few others very similar. These functions are very fast, the only problem is the quality. If I scale or rotate the same image with any image editor the quality is much better. With Allegro I clearly see jagged edges and pixels.

With GIMP, for example, for scaling an image, there are three options: "Linear", "Cubic" and "Sinc (Lanczos 3)". Aren't these algorithms hardware accelerated? Are there in Allegro?

Upvotes: 0

Views: 662

Answers (1)

goobliata
goobliata

Reputation: 340

You can enable linear interpolation with Allegro like this:

al_set_new_bitmap_flags(ALLEGRO_MIN_LINEAR | ALLEGRO_MAG_LINEAR);

Before loading your bitmaps.

Upvotes: 1

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