Implement pixman renderer

This renderer could be used when there's no graphic accelerator available,
for example in (future) KMS and fbdev backends.

Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>

src/Makefile.am

@@ -36,6 +36,7 @@ weston_SOURCES =				\
 	gl-renderer.h				\
 	gl-renderer.c				\
 	noop-renderer.c				\
+	pixman-renderer.c			\
 	../shared/matrix.c			\
 	../shared/matrix.h			\
 	weston-launch.h				\

src/pixman-renderer.c

@@ -0,0 +1,380 @@
+/*
+ * Copyright © 2012 Intel Corporation
+ * Copyright © 2013 Vasily Khoruzhick <anarsoul@gmail.com>
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and
+ * its documentation for any purpose is hereby granted without fee, provided
+ * that the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation, and that the name of the copyright holders not be used in
+ * advertising or publicity pertaining to distribution of the software
+ * without specific, written prior permission.  The copyright holders make
+ * no representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
+ * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
+ * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#define _GNU_SOURCE
+
+#include <errno.h>
+#include <stdlib.h>
+
+#include "pixman-renderer.h"
+
+struct pixman_output_state {
+	pixman_image_t *hw_buffer;
+};
+
+struct pixman_surface_state {
+	pixman_image_t *image;
+	struct weston_buffer_reference buffer_ref;
+};
+
+struct pixman_renderer {
+	struct weston_renderer base;
+};
+
+static inline struct pixman_output_state *
+get_output_state(struct weston_output *output)
+{
+	return (struct pixman_output_state *)output->renderer_state;
+}
+
+static inline struct pixman_surface_state *
+get_surface_state(struct weston_surface *surface)
+{
+	return (struct pixman_surface_state *)surface->renderer_state;
+}
+
+static inline struct pixman_renderer *
+get_renderer(struct weston_compositor *ec)
+{
+	return (struct pixman_renderer *)ec->renderer;
+}
+
+static int
+pixman_renderer_read_pixels(struct weston_output *output,
+			       pixman_format_code_t format, void *pixels,
+			       uint32_t x, uint32_t y,
+			       uint32_t width, uint32_t height)
+{
+	struct pixman_output_state *po = get_output_state(output);
+	pixman_image_t *out_buf;
+	uint32_t cur_y;
+
+	if (!po->hw_buffer) {
+		errno = ENODEV;
+		return -1;
+	}
+
+	out_buf = pixman_image_create_bits(format,
+		width,
+		height,
+		pixels,
+		(PIXMAN_FORMAT_BPP(format) / 8) * width);
+
+	/* Caller expects vflipped image */
+	for (cur_y = y; cur_y < y + height; cur_y++) {
+		pixman_image_composite32(PIXMAN_OP_SRC,
+			po->hw_buffer, /* src */
+			NULL /* mask */,
+			out_buf, /* dest */
+			x, cur_y, /* src_x, src_y */
+			0, 0, /* mask_x, mask_y */
+			0, height - (cur_y - y), /* dest_x, dest_y */
+			width, /* width */
+			1 /* height */);
+	}
+
+	pixman_image_unref(out_buf);
+
+	return 0;
+}
+
+static void
+repaint_region(struct weston_surface *es, struct weston_output *output,
+		pixman_region32_t *region, pixman_region32_t *surf_region,
+		pixman_op_t pixman_op)
+{
+	struct pixman_surface_state *ps = get_surface_state(es);
+	struct pixman_output_state *po = get_output_state(output);
+	pixman_region32_t final_region;
+	pixman_box32_t *rects;
+	int nrects, i, src_x, src_y;
+	float surface_x, surface_y;
+
+	/* The final region to be painted is the intersection of
+	 * 'region' and 'surf_region'. However, 'region' is in the global
+	 * coordinates, and 'surf_region' is in the surface-local
+	 * coordinates
+	 */
+	pixman_region32_init(&final_region);
+	pixman_region32_copy(&final_region, surf_region);
+
+	if (es->transform.enabled) {
+		weston_surface_to_global_float(es, 0, 0, &surface_x, &surface_y);
+		pixman_region32_translate(&final_region, (int)surface_x, (int)surface_y);
+	} else
+		pixman_region32_translate(&final_region, es->geometry.x, es->geometry.y);
+
+	/* That's what we need to paint */
+	pixman_region32_intersect(&final_region, &final_region, region);
+
+	rects = pixman_region32_rectangles(&final_region, &nrects);
+
+	for (i = 0; i < nrects; i++) {
+		weston_surface_from_global(es, rects[i].x1, rects[i].y1, &src_x, &src_y);
+		pixman_image_composite32(pixman_op,
+			ps->image, /* src */
+			NULL /* mask */,
+			po->hw_buffer, /* dest */
+			src_x, src_y, /* src_x, src_y */
+			0, 0, /* mask_x, mask_y */
+			rects[i].x1, rects[i].y1, /* dest_x, dest_y */
+			rects[i].x2 - rects[i].x1, /* width */
+			rects[i].y2 - rects[i].y1 /* height */);
+	}
+	pixman_region32_fini(&final_region);
+}
+
+static void
+draw_surface(struct weston_surface *es, struct weston_output *output,
+	     pixman_region32_t *damage) /* in global coordinates */
+{
+	struct pixman_surface_state *ps = get_surface_state(es);
+	/* repaint bounding region in global coordinates: */
+	pixman_region32_t repaint;
+	/* non-opaque region in surface coordinates: */
+	pixman_region32_t surface_blend;
+
+	/* No buffer attached */
+	if (!ps->image)
+		return;
+
+	pixman_region32_init(&repaint);
+	pixman_region32_intersect(&repaint,
+				  &es->transform.boundingbox, damage);
+	pixman_region32_subtract(&repaint, &repaint, &es->clip);
+
+	if (!pixman_region32_not_empty(&repaint))
+		goto out;
+
+	if (output->zoom.active) {
+		weston_log("pixman renderer does not support zoom\n");
+		goto out;
+	}
+
+	/* blended region is whole surface minus opaque region: */
+	pixman_region32_init_rect(&surface_blend, 0, 0,
+				  es->geometry.width, es->geometry.height);
+	pixman_region32_subtract(&surface_blend, &surface_blend, &es->opaque);
+
+	if (pixman_region32_not_empty(&es->opaque)) {
+		repaint_region(es, output, &repaint, &es->opaque, PIXMAN_OP_SRC);
+	}
+
+	if (pixman_region32_not_empty(&surface_blend)) {
+		repaint_region(es, output, &repaint, &surface_blend, PIXMAN_OP_OVER);
+	}
+
+	pixman_region32_fini(&surface_blend);
+
+out:
+	pixman_region32_fini(&repaint);
+}
+static void
+repaint_surfaces(struct weston_output *output, pixman_region32_t *damage)
+{
+	struct weston_compositor *compositor = output->compositor;
+	struct weston_surface *surface;
+
+	wl_list_for_each_reverse(surface, &compositor->surface_list, link)
+		if (surface->plane == &compositor->primary_plane)
+			draw_surface(surface, output, damage);
+}
+
+static void
+pixman_renderer_repaint_output(struct weston_output *output,
+			     pixman_region32_t *output_damage)
+{
+	struct pixman_output_state *po = get_output_state(output);
+
+	if (!po->hw_buffer)
+		return;
+
+	repaint_surfaces(output, output_damage);
+
+	pixman_region32_copy(&output->previous_damage, output_damage);
+	wl_signal_emit(&output->frame_signal, output);
+
+	/* Actual flip should be done by caller */
+}
+
+static void
+pixman_renderer_flush_damage(struct weston_surface *surface)
+{
+	/* No-op for pixman renderer */
+}
+
+static void
+pixman_renderer_attach(struct weston_surface *es, struct wl_buffer *buffer)
+{
+	struct pixman_surface_state *ps = get_surface_state(es);
+	pixman_format_code_t pixman_format;
+
+	weston_buffer_reference(&ps->buffer_ref, buffer);
+
+	if (ps->image) {
+		pixman_image_unref(ps->image);
+		ps->image = NULL;
+	}
+
+	if (!buffer)
+		return;
+
+	if (!wl_buffer_is_shm(buffer)) {
+		weston_log("Pixman renderer supports only SHM buffers\n");
+		weston_buffer_reference(&ps->buffer_ref, NULL);
+		return;
+	}
+
+	switch (wl_shm_buffer_get_format(buffer)) {
+	case WL_SHM_FORMAT_XRGB8888:
+		pixman_format = PIXMAN_x8r8g8b8;
+		break;
+	case WL_SHM_FORMAT_ARGB8888:
+		pixman_format = PIXMAN_a8r8g8b8;
+		break;
+	default:
+		weston_log("Unsupported SHM buffer format\n");
+		weston_buffer_reference(&ps->buffer_ref, NULL);
+		return;
+	break;
+	}
+	ps->image = pixman_image_create_bits(pixman_format,
+		wl_shm_buffer_get_width(buffer),
+		wl_shm_buffer_get_height(buffer),
+		wl_shm_buffer_get_data(buffer),
+		wl_shm_buffer_get_stride(buffer));
+}
+
+static int
+pixman_renderer_create_surface(struct weston_surface *surface)
+{
+	struct pixman_surface_state *ps;
+
+	ps = calloc(1, sizeof *ps);
+	if (!ps)
+		return -1;
+
+	surface->renderer_state = ps;
+
+	return 0;
+}
+
+static void
+pixman_renderer_surface_set_color(struct weston_surface *es,
+		 float red, float green, float blue, float alpha)
+{
+	struct pixman_surface_state *ps = get_surface_state(es);
+	pixman_color_t color;
+
+	color.red = red * 0xffff;
+	color.green = green * 0xffff;
+	color.blue = blue * 0xffff;
+	color.alpha = alpha * 0xffff;
+	
+	if (ps->image) {
+		pixman_image_unref(ps->image);
+		ps->image = NULL;
+	}
+
+	ps->image = pixman_image_create_solid_fill(&color);
+}
+
+static void
+pixman_renderer_destroy_surface(struct weston_surface *surface)
+{
+	struct pixman_surface_state *ps = get_surface_state(surface);
+
+	if (ps->image) {
+		pixman_image_unref(ps->image);
+		ps->image = NULL;
+	}
+	weston_buffer_reference(&ps->buffer_ref, NULL);
+	free(ps);
+}
+
+WL_EXPORT void
+pixman_renderer_destroy(struct weston_compositor *ec)
+{
+	free(ec->renderer);
+	ec->renderer = NULL;
+}
+
+WL_EXPORT int
+pixman_renderer_init(struct weston_compositor *ec)
+{
+	struct weston_renderer *renderer;
+
+	renderer = malloc(sizeof *renderer);
+	if (renderer == NULL)
+		return -1;
+
+	renderer->read_pixels = pixman_renderer_read_pixels;
+	renderer->repaint_output = pixman_renderer_repaint_output;
+	renderer->flush_damage = pixman_renderer_flush_damage;
+	renderer->attach = pixman_renderer_attach;
+	renderer->create_surface = pixman_renderer_create_surface;
+	renderer->surface_set_color = pixman_renderer_surface_set_color;
+	renderer->destroy_surface = pixman_renderer_destroy_surface;
+	ec->renderer = renderer;
+
+	return 0;
+}
+
+WL_EXPORT void
+pixman_renderer_output_set_buffer(struct weston_output *output, pixman_image_t *buffer)
+{
+	struct pixman_output_state *po = get_output_state(output);
+
+	if (po->hw_buffer)
+		pixman_image_unref(po->hw_buffer);
+	po->hw_buffer = buffer;
+
+	if (po->hw_buffer) {
+		output->compositor->read_format = pixman_image_get_format(po->hw_buffer);
+		pixman_image_ref(po->hw_buffer);
+	}
+}
+
+WL_EXPORT int
+pixman_renderer_output_create(struct weston_output *output)
+{
+	struct pixman_output_state *po = calloc(1, sizeof *po);
+
+	if (!po)
+		return -1;
+	
+	output->renderer_state = po;
+
+	return 0;
+}
+
+WL_EXPORT void
+pixman_renderer_output_destroy(struct weston_output *output)
+{
+	struct pixman_output_state *po = get_output_state(output);
+
+	pixman_image_unref(po->hw_buffer);
+	po->hw_buffer = NULL;
+
+	free(po);
+}

src/pixman-renderer.h

@@ -0,0 +1,38 @@
+/*
+ * Copyright © 2013 Vasily Khoruzhick <anarsoul@gmail.com>
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and
+ * its documentation for any purpose is hereby granted without fee, provided
+ * that the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation, and that the name of the copyright holders not be used in
+ * advertising or publicity pertaining to distribution of the software
+ * without specific, written prior permission.  The copyright holders make
+ * no representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
+ * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
+ * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include  "compositor.h"
+
+void
+pixman_renderer_destroy(struct weston_compositor *ec);
+
+int
+pixman_renderer_init(struct weston_compositor *ec);
+
+int
+pixman_renderer_output_create(struct weston_output *output);
+
+void
+pixman_renderer_output_set_buffer(struct weston_output *output, pixman_image_t *buffer);
+
+void
+pixman_renderer_output_destroy(struct weston_output *output);