diff options
Diffstat (limited to 'pixman/pixman/pixman.h')
| -rw-r--r-- | pixman/pixman/pixman.h | 50 |
1 files changed, 49 insertions, 1 deletions
diff --git a/pixman/pixman/pixman.h b/pixman/pixman/pixman.h index 33ebf3f64..7ff9fb52a 100644 --- a/pixman/pixman/pixman.h +++ b/pixman/pixman/pixman.h @@ -292,7 +292,28 @@ typedef enum PIXMAN_FILTER_BEST, PIXMAN_FILTER_NEAREST, PIXMAN_FILTER_BILINEAR, - PIXMAN_FILTER_CONVOLUTION + PIXMAN_FILTER_CONVOLUTION, + + /* The SEPARABLE_CONVOLUTION filter takes the following parameters: + * + * width: integer given as 16.16 fixpoint number + * height: integer given as 16.16 fixpoint number + * x_phase_bits: integer given as 16.16 fixpoint + * y_phase_bits: integer given as 16.16 fixpoint + * xtables: (1 << x_phase_bits) tables of size width + * ytables: (1 << y_phase_bits) tables of size height + * + * When sampling at (x, y), the location is first rounded to one of + * n_x_phases * n_y_phases subpixel positions. These subpixel positions + * determine an xtable and a ytable to use. + * + * Conceptually a width x height matrix is then formed in which each entry + * is the product of the corresponding entries in the x and y tables. + * This matrix is then aligned with the image pixels such that its center + * is as close as possible to the subpixel location chosen earlier. Then + * the image is convolved with the matrix and the resulting pixel returned. + */ + PIXMAN_FILTER_SEPARABLE_CONVOLUTION } pixman_filter_t; typedef enum @@ -810,6 +831,33 @@ int pixman_image_get_height (pixman_image_t int pixman_image_get_stride (pixman_image_t *image); /* in bytes */ int pixman_image_get_depth (pixman_image_t *image); pixman_format_code_t pixman_image_get_format (pixman_image_t *image); + +typedef enum +{ + PIXMAN_KERNEL_IMPULSE, + PIXMAN_KERNEL_BOX, + PIXMAN_KERNEL_LINEAR, + PIXMAN_KERNEL_CUBIC, + PIXMAN_KERNEL_GAUSSIAN, + PIXMAN_KERNEL_LANCZOS2, + PIXMAN_KERNEL_LANCZOS3, + PIXMAN_KERNEL_LANCZOS3_STRETCHED /* Jim Blinn's 'nice' filter */ +} pixman_kernel_t; + +/* Create the parameter list for a SEPARABLE_CONVOLUTION filter + * with the given kernels and scale parameters. + */ +pixman_fixed_t * +pixman_filter_create_separable_convolution (int *n_values, + pixman_fixed_t scale_x, + pixman_fixed_t scale_y, + pixman_kernel_t reconstruct_x, + pixman_kernel_t reconstruct_y, + pixman_kernel_t sample_x, + pixman_kernel_t sample_y, + int subsample_bits_x, + int subsample_bits_y); + pixman_bool_t pixman_image_fill_rectangles (pixman_op_t op, pixman_image_t *image, const pixman_color_t *color, |