From: Søren Sandmann Pedersen <[email protected]>
This is a simple demo that displays a checkboard with a projective
transformation.
---
demos/Makefile.am | 5 +-
demos/checkerboard.c | 152 ++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 156 insertions(+), 1 deletions(-)
create mode 100644 demos/checkerboard.c
diff --git a/demos/Makefile.am b/demos/Makefile.am
index 070c2d7..6049090 100644
--- a/demos/Makefile.am
+++ b/demos/Makefile.am
@@ -18,7 +18,9 @@ DEMOS = \
screen-test \
convolution-test \
trap-test \
- tri-test
+ tri-test \
+ quad2quad \
+ checkerboard
gradient_test_SOURCES = gradient-test.c $(GTK_UTILS)
alpha_test_SOURCES = alpha-test.c $(GTK_UTILS)
@@ -30,6 +32,7 @@ screen_test_SOURCES = screen-test.c $(GTK_UTILS)
convolution_test_SOURCES = convolution-test.c $(GTK_UTILS)
radial_test_SOURCES = radial-test.c ../test/utils.c ../test/utils.h
$(GTK_UTILS)
tri_test_SOURCES = tri-test.c ../test/utils.c ../test/utils.h $(GTK_UTILS)
+checkerboard_SOURCES = checkerboard.c $(GTK_UTILS)
noinst_PROGRAMS = $(DEMOS)
diff --git a/demos/checkerboard.c b/demos/checkerboard.c
new file mode 100644
index 0000000..264717d
--- /dev/null
+++ b/demos/checkerboard.c
@@ -0,0 +1,152 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include "pixman.h"
+#include "gtk-utils.h"
+
+int
+main (int argc, char **argv)
+{
+#define WIDTH 400
+#define HEIGHT 400
+#define TILE_SIZE 25
+
+ pixman_image_t *checkerboard;
+ pixman_image_t *destination;
+#define D2F(d) (pixman_double_to_fixed(d))
+ pixman_transform_t trans = { {
+ { D2F (-1.96830), D2F (-1.82250), D2F (512.12250)},
+ { D2F (0.00000), D2F (-7.29000), D2F (1458.00000)},
+ { D2F (0.00000), D2F (-0.00911), D2F (0.59231)},
+ }};
+
+
+ int i, j;
+
+ checkerboard = pixman_image_create_bits (PIXMAN_a8r8g8b8,
+ WIDTH, HEIGHT,
+ NULL, 0);
+
+ destination = pixman_image_create_bits (PIXMAN_a8r8g8b8,
+ WIDTH, HEIGHT,
+ NULL, 0);
+
+ for (i = 0; i < HEIGHT / TILE_SIZE; ++i)
+ {
+ for (j = 0; j < WIDTH / TILE_SIZE; ++j)
+ {
+ double u = (double)(j + 1) / (WIDTH / TILE_SIZE);
+ double v = (double)(i + 1) / (HEIGHT / TILE_SIZE);
+ pixman_color_t black = { 0, 0, 0, 0xffff };
+ pixman_color_t white = {
+ v * 0xffff,
+ u * 0xffff,
+ (1 - (double)u) * 0xffff,
+ 0xffff };
+ pixman_color_t *c;
+ pixman_image_t *fill;
+
+ if ((j & 1) != (i & 1))
+ c = &black;
+ else
+ c = &white;
+
+ fill = pixman_image_create_solid_fill (c);
+
+ pixman_image_composite (PIXMAN_OP_SRC, fill, NULL, checkerboard,
+ 0, 0, 0, 0, j * TILE_SIZE, i * TILE_SIZE,
+ TILE_SIZE, TILE_SIZE);
+ }
+ }
+
+ pixman_image_set_transform (checkerboard, &trans);
+ pixman_image_set_filter (checkerboard, PIXMAN_FILTER_BEST, NULL, 0);
+ pixman_image_set_repeat (checkerboard, PIXMAN_REPEAT_NONE);
+
+ pixman_image_composite (PIXMAN_OP_SRC,
+ checkerboard, NULL, destination,
+ 0, 0, 0, 0, 0, 0,
+ WIDTH, HEIGHT);
+
+ show_image (destination);
+#if 0
+
+
+ uint32_t *dest = malloc (WIDTH * HEIGHT * 4);
+ pixman_image_t *src_img;
+ pixman_image_t *dest_img;
+ int i;
+ pixman_gradient_stop_t stops[2] =
+ {
+ { pixman_int_to_fixed (0), { 0xffff, 0xeeee, 0xeeee, 0xeeee } },
+ { pixman_int_to_fixed (1), { 0xffff, 0x1111, 0x1111, 0x1111 } }
+ };
+ pixman_point_fixed_t p1 = { pixman_double_to_fixed (0), 0 };
+ pixman_point_fixed_t p2 = { pixman_double_to_fixed (WIDTH / 8.),
+ pixman_int_to_fixed (0) };
+#if 0
+ pixman_transform_t trans = {
+ { { pixman_double_to_fixed (2), pixman_double_to_fixed (0.5),
pixman_double_to_fixed (-100), },
+ { pixman_double_to_fixed (0), pixman_double_to_fixed (3),
pixman_double_to_fixed (0), },
+ { pixman_double_to_fixed (0), pixman_double_to_fixed (0.000),
pixman_double_to_fixed (1.0) }
+ }
+ };
+#else
+ pixman_transform_t trans = {
+ { { pixman_fixed_1, 0, 0 },
+ { 0, pixman_fixed_1, 0 },
+ { 0, 0, pixman_fixed_1 } }
+ };
+#endif
+
+ pixman_point_fixed_t c_inner;
+ pixman_point_fixed_t c_outer;
+ pixman_fixed_t r_inner;
+ pixman_fixed_t r_outer;
+
+ for (i = 0; i < WIDTH * HEIGHT; ++i)
+ dest[i] = 0x4f00004f; /* pale blue */
+
+ dest_img = pixman_image_create_bits (PIXMAN_a8r8g8b8,
+ WIDTH, HEIGHT,
+ dest,
+ WIDTH * 4);
+
+ c_inner.x = pixman_double_to_fixed (50.0);
+ c_inner.y = pixman_double_to_fixed (50.0);
+ c_outer.x = pixman_double_to_fixed (50.0);
+ c_outer.y = pixman_double_to_fixed (50.0);
+ r_inner = 0;
+ r_outer = pixman_double_to_fixed (50.0);
+
+ src_img = pixman_image_create_conical_gradient (&c_inner, r_inner,
+ stops, 2);
+#if 0
+ src_img = pixman_image_create_conical_gradient (&c_inner, r_inner,
+ stops, 2);
+ src_img = pixman_image_create_linear_gradient (&c_inner, &c_outer,
+ r_inner, r_outer,
+ stops, 2);
+#endif
+
+ src_img = pixman_image_create_linear_gradient (&p1, &p2,
+ stops, 2);
+
+ pixman_image_set_transform (src_img, &trans);
+ pixman_image_set_repeat (src_img, PIXMAN_REPEAT_PAD);
+
+ pixman_image_composite (PIXMAN_OP_OVER, src_img, NULL, dest_img,
+ 0, 0, 0, 0, 0, 0, 10 * WIDTH, HEIGHT);
+
+ printf ("0, 0: %x\n", dest[0]);
+ printf ("10, 10: %x\n", dest[10 * 10 + 10]);
+ printf ("w, h: %x\n", dest[(HEIGHT - 1) * 100 + (WIDTH - 1)]);
+
+ show_image (dest_img);
+
+ pixman_image_unref (src_img);
+ pixman_image_unref (dest_img);
+ free (dest);
+#endif
+
+ return 0;
+}
--
1.6.0.6
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