per-ball "sprite" cairo surface.
This commit is contained in:
Antonio Carzaniga
parent
d715b99e32
commit
2c9348be56
106
balls.c
106
balls.c
@ -20,6 +20,8 @@ struct ball {
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double v_y;
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guchar rgb_channels[3];
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cairo_surface_t * surface;
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};
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static double delta = 0.01; /* seconds */
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@ -143,10 +145,6 @@ static void update_state () {
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static GtkWidget * window;
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static cairo_t * cr = 0;
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const char * face_filename = 0;
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cairo_surface_t * face_surface = 0;
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int face_x_offset, face_y_offset;
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static int gravity_vector_countdown = 0;
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static int gravity_vector_init = 300;
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@ -165,10 +163,59 @@ static void draw_gravity_vector() {
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}
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}
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static int balls_graphics_initialized = 0;
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const char * face_filename = 0;
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static void init_graphics() {
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if (cr)
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cairo_destroy(cr);
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cr = gdk_cairo_create(window->window);
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if (balls_graphics_initialized)
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return;
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cairo_surface_t * face_surface;
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int face_x_offset, face_y_offset;
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if (face_filename) {
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face_surface = cairo_image_surface_create_from_png (face_filename);
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switch (cairo_surface_status(face_surface)) {
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case CAIRO_STATUS_SUCCESS:
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face_x_offset = cairo_image_surface_get_width (face_surface) / 2;
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face_y_offset = cairo_image_surface_get_height (face_surface) / 2;
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break;
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default:
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cairo_surface_destroy (face_surface);
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face_surface = 0;
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fprintf(stderr, "could not create sorfece from PNG file %s\n", face_filename);
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}
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} else
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face_surface = 0;
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for(int i = 0; i < n_balls; ++i) {
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balls[i].surface = gdk_window_create_similar_surface(window->window,
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CAIRO_CONTENT_COLOR_ALPHA,
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2*balls[i].radius, 2*balls[i].radius);
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cairo_t * ball_cr = cairo_create(balls[i].surface);
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cairo_translate(ball_cr, balls[i].radius, balls[i].radius);
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cairo_arc(ball_cr, 0.0, 0.0, balls[i].radius, 0, 2 * M_PI);
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cairo_clip(ball_cr);
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cairo_set_source_rgb(ball_cr,
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1.0*balls[i].rgb_channels[0]/255,
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1.0*balls[i].rgb_channels[1]/255,
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1.0*balls[i].rgb_channels[2]/255);
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cairo_paint(ball_cr);
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if (face_surface) {
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cairo_scale (ball_cr, 1.0 * balls[i].radius / face_x_offset, 1.0 * balls[i].radius / face_y_offset);
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cairo_set_source_surface(ball_cr, face_surface, -face_x_offset, -face_y_offset);
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cairo_paint(ball_cr);
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}
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cairo_surface_flush(balls[i].surface);
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cairo_destroy(ball_cr);
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}
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if (face_surface)
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cairo_surface_destroy (face_surface);
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balls_graphics_initialized = 1;
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}
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static void destroy_graphics() {
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@ -176,6 +223,11 @@ static void destroy_graphics() {
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cairo_destroy(cr);
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cr = 0;
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}
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if (balls_graphics_initialized) {
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for(int i = 0; i < n_balls; ++i)
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cairo_surface_destroy(balls[i].surface);
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balls_graphics_initialized = 0;
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}
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}
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static void draw_balls_onto_window () {
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@ -187,28 +239,11 @@ static void draw_balls_onto_window () {
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/* draw balls */
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for(int i = 0; i < n_balls; ++i) {
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if (face_surface) {
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cairo_save(cr);
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cairo_translate(cr, balls[i].x, balls[i].y);
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cairo_arc(cr, 0.0, 0.0, balls[i].radius, 0, 2 * M_PI);
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cairo_clip(cr);
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cairo_set_source_rgb(cr,
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1.0*balls[i].rgb_channels[0]/255,
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1.0*balls[i].rgb_channels[1]/255,
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1.0*balls[i].rgb_channels[2]/255);
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cairo_paint(cr);
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cairo_scale (cr, 1.0 * balls[i].radius / face_x_offset, 1.0 * balls[i].radius / face_y_offset);
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cairo_set_source_surface(cr, face_surface, -face_x_offset, -face_y_offset);
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cairo_paint(cr);
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cairo_restore(cr);
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} else {
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cairo_set_source_rgb(cr,
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1.0*balls[i].rgb_channels[0]/255,
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1.0*balls[i].rgb_channels[1]/255,
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1.0*balls[i].rgb_channels[2]/255);
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cairo_arc(cr, balls[i].x, balls[i].y, balls[i].radius, 0, 2 * M_PI);
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cairo_fill(cr);
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}
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cairo_save(cr);
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cairo_translate(cr, balls[i].x - balls[i].radius, balls[i].y - balls[i].radius);
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cairo_set_source_surface(cr, balls[i].surface, 0, 0);
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cairo_paint(cr);
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cairo_restore(cr);
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}
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}
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@ -269,7 +304,6 @@ static gboolean expose_event (GtkWidget *widget, GdkEventExpose *event, gpointer
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static void destroy_window (void) {
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gtk_main_quit();
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destroy_graphics();
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}
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void print_usage (const char * progname) {
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@ -308,20 +342,6 @@ gboolean timeout (gpointer user_data) {
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return TRUE;
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}
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void define_face_surface(const char * filename) {
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face_surface = cairo_image_surface_create_from_png (filename);
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switch (cairo_surface_status(face_surface)) {
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case CAIRO_STATUS_SUCCESS:
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face_x_offset = cairo_image_surface_get_width (face_surface) / 2;
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face_y_offset = cairo_image_surface_get_height (face_surface) / 2;
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break;
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default:
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cairo_surface_destroy (face_surface);
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face_surface = 0;
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fprintf(stderr, "could not create sorfece from PNG file %s\n", filename);
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}
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}
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int main (int argc, const char *argv[]) {
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int w = DEFAULT_WIDTH;
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int h = DEFAULT_HEIGHT;
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@ -342,7 +362,7 @@ int main (int argc, const char *argv[]) {
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if (sscanf(argv[i], "delta=%lf", &delta) == 1)
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continue;
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if (strncmp(argv[i], "face=", 5) == 0) {
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define_face_surface(argv[i] + 5);
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face_filename = argv[i] + 5;
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continue;
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}
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if (sscanf(argv[i], "clear=%lf", &clear_alpha) == 1)
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@ -378,6 +398,8 @@ int main (int argc, const char *argv[]) {
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gtk_main();
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gtk_widget_destroy(window);
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destroy_graphics();
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free(balls);
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return 0;
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