If you are familiar with piecing and applique, it's a pretty easy pattern to figure out using graph paper. If you make the pieced four-square center 1"-square finished pieces, then the next row consists of 1"x2" finished rectangles alternating with 2" squares. The outer row is similar.
For the two arc pieces, you can either hand draw or use a protractor (or cup, small saucer) to draw the curved pieces.
Judging from the sample, the original quilter felt fine with cutting down her pieced squares to fit as needed.
It looks to me as if the hearts may have been reverse-appliqued to the white block backgrounds.
The finished heart blocks were alternated with plain background squares in an on-point setting.