render/pixman: implement render pass API

include/render/pixman.h

@@ -1,9 +1,10 @@
 #ifndef RENDER_PIXMAN_H
 #define RENDER_PIXMAN_H
 
+#include <wlr/render/drm_format_set.h>
+#include <wlr/render/interface.h>
 #include <wlr/render/pixman.h>
 #include <wlr/render/wlr_renderer.h>
-#include <wlr/render/drm_format_set.h>
 #include "render/pixel_format.h"
 
 struct wlr_pixman_pixel_format {
@@ -48,6 +49,11 @@ struct wlr_pixman_texture {
 	struct wlr_buffer *buffer; // if created via texture_from_buffer
 };
 
+struct wlr_pixman_render_pass {
+	struct wlr_render_pass base;
+	struct wlr_pixman_buffer *buffer;
+};
+
 pixman_format_code_t get_pixman_format_from_drm(uint32_t fmt);
 uint32_t get_drm_format_from_pixman(pixman_format_code_t fmt);
 const uint32_t *get_pixman_drm_formats(size_t *len);
@@ -55,4 +61,7 @@ const uint32_t *get_pixman_drm_formats(size_t *len);
 bool begin_pixman_data_ptr_access(struct wlr_buffer *buffer, pixman_image_t **image_ptr,
 	uint32_t flags);
 
+struct wlr_pixman_render_pass *begin_pixman_render_pass(
+	struct wlr_pixman_buffer *buffer);
+
 #endif

render/pixman/meson.build

@@ -3,6 +3,7 @@ pixman = dependency('pixman-1')
 wlr_deps += pixman
 
 wlr_files += files(
+	'pass.c',
 	'pixel_format.c',
 	'renderer.c',
 )

render/pixman/pass.c

@@ -0,0 +1,181 @@
+#include <assert.h>
+#include <stdlib.h>
+#include "render/pixman.h"
+
+static const struct wlr_render_pass_impl render_pass_impl;
+
+static struct wlr_pixman_render_pass *get_render_pass(struct wlr_render_pass *wlr_pass) {
+	assert(wlr_pass->impl == &render_pass_impl);
+	struct wlr_pixman_render_pass *pass = wl_container_of(wlr_pass, pass, base);
+	return pass;
+}
+
+static struct wlr_pixman_texture *get_texture(struct wlr_texture *wlr_texture) {
+	assert(wlr_texture_is_pixman(wlr_texture));
+	struct wlr_pixman_texture *texture = wl_container_of(wlr_texture, texture, wlr_texture);
+	return texture;
+}
+
+static bool render_pass_submit(struct wlr_render_pass *wlr_pass) {
+	struct wlr_pixman_render_pass *pass = get_render_pass(wlr_pass);
+
+	wlr_buffer_end_data_ptr_access(pass->buffer->buffer);
+	wlr_buffer_unlock(pass->buffer->buffer);
+	free(pass);
+
+	return true;
+}
+
+static void render_pass_add_texture(struct wlr_render_pass *wlr_pass,
+		const struct wlr_render_texture_options *options) {
+	struct wlr_pixman_render_pass *pass = get_render_pass(wlr_pass);
+	struct wlr_pixman_texture *texture = get_texture(options->texture);
+	struct wlr_pixman_buffer *buffer = pass->buffer;
+	struct wlr_box dst_box = options->dst_box;
+
+	if (texture->buffer != NULL && !begin_pixman_data_ptr_access(texture->buffer,
+			&texture->image, WLR_BUFFER_DATA_PTR_ACCESS_READ)) {
+		return;
+	}
+
+	struct wlr_fbox src_fbox;
+	wlr_render_texture_options_get_src_box(options, &src_fbox);
+	struct wlr_box src_box = {
+		.x = roundf(src_fbox.x),
+		.y = roundf(src_fbox.y),
+		.width = roundf(src_fbox.width),
+		.height = roundf(src_fbox.height),
+	};
+
+	pixman_image_t *mask = NULL;
+	float alpha = wlr_render_texture_options_get_alpha(options);
+	if (alpha != 1) {
+		mask = pixman_image_create_solid_fill(&(struct pixman_color){
+			.alpha = 0xFFFF * alpha,
+		});
+	}
+
+	int32_t dest_x, dest_y, width, height;
+	if (options->transform != WL_OUTPUT_TRANSFORM_NORMAL) {
+		// Cosinus/sinus values are extact integers for enum wl_output_transform entries
+		int tr_cos = 1, tr_sin = 0, tr_x = 0, tr_y = 0;
+		switch (options->transform) {
+		case WL_OUTPUT_TRANSFORM_NORMAL:
+		case WL_OUTPUT_TRANSFORM_FLIPPED:
+			break;
+		case WL_OUTPUT_TRANSFORM_90:
+		case WL_OUTPUT_TRANSFORM_FLIPPED_90:
+			tr_cos = 0;
+			tr_sin = 1;
+			tr_x = buffer->buffer->height;
+			break;
+		case WL_OUTPUT_TRANSFORM_180:
+		case WL_OUTPUT_TRANSFORM_FLIPPED_180:
+			tr_cos = -1;
+			tr_sin = 0;
+			tr_x = buffer->buffer->width;
+			tr_y = buffer->buffer->height;
+			break;
+		case WL_OUTPUT_TRANSFORM_270:
+		case WL_OUTPUT_TRANSFORM_FLIPPED_270:
+			tr_cos = 0;
+			tr_sin = -1;
+			tr_y = buffer->buffer->width;
+			break;
+		}
+
+		struct wlr_box orig_box;
+		wlr_box_transform(&orig_box, &dst_box, options->transform,
+			buffer->buffer->width, buffer->buffer->height);
+
+		struct pixman_transform transform;
+		pixman_transform_init_identity(&transform);
+		pixman_transform_rotate(&transform, NULL,
+			pixman_int_to_fixed(tr_cos), pixman_int_to_fixed(tr_sin));
+		if (options->transform >= WL_OUTPUT_TRANSFORM_FLIPPED) {
+			pixman_transform_scale(&transform, NULL,
+				pixman_int_to_fixed(-1), pixman_int_to_fixed(1));
+		}
+		pixman_transform_translate(&transform, NULL,
+			pixman_int_to_fixed(tr_x), pixman_int_to_fixed(tr_y));
+		pixman_transform_translate(&transform, NULL,
+			-pixman_int_to_fixed(orig_box.x), -pixman_int_to_fixed(orig_box.y));
+		pixman_image_set_transform(texture->image, &transform);
+
+		dest_x = dest_y = 0;
+		width = buffer->buffer->width;
+		height = buffer->buffer->height;
+	} else {
+		pixman_image_set_transform(texture->image, NULL);
+		dest_x = dst_box.x;
+		dest_y = dst_box.y;
+		width = src_box.width;
+		height = src_box.height;
+	}
+
+	pixman_image_set_clip_region32(buffer->image, (pixman_region32_t *)options->clip);
+	pixman_image_composite32(PIXMAN_OP_OVER, texture->image, mask,
+		buffer->image, src_box.x, src_box.y, 0, 0, dest_x, dest_y,
+		width, height);
+	pixman_image_set_clip_region32(buffer->image, NULL);
+
+	pixman_image_set_transform(texture->image, NULL);
+
+	if (texture->buffer != NULL) {
+		wlr_buffer_end_data_ptr_access(texture->buffer);
+	}
+
+	if (mask != NULL) {
+		pixman_image_unref(mask);
+	}
+}
+
+static void render_pass_add_rect(struct wlr_render_pass *wlr_pass,
+		const struct wlr_render_rect_options *options) {
+	struct wlr_pixman_render_pass *pass = get_render_pass(wlr_pass);
+	struct wlr_pixman_buffer *buffer = pass->buffer;
+	struct wlr_box box = options->box;
+
+	struct pixman_color color = {
+		.red = options->color.r * 0xFFFF,
+		.green = options->color.g * 0xFFFF,
+		.blue = options->color.b * 0xFFFF,
+		.alpha = options->color.a * 0xFFFF,
+	};
+
+	pixman_image_t *fill = pixman_image_create_solid_fill(&color);
+
+	pixman_image_set_clip_region32(buffer->image, (pixman_region32_t *)options->clip);
+	pixman_image_composite32(PIXMAN_OP_OVER, fill, NULL, buffer->image,
+		0, 0, 0, 0, box.x, box.y, box.width, box.height);
+	pixman_image_set_clip_region32(buffer->image, NULL);
+
+	pixman_image_unref(fill);
+}
+
+static const struct wlr_render_pass_impl render_pass_impl = {
+	.submit = render_pass_submit,
+	.add_texture = render_pass_add_texture,
+	.add_rect = render_pass_add_rect,
+};
+
+struct wlr_pixman_render_pass *begin_pixman_render_pass(
+		struct wlr_pixman_buffer *buffer) {
+	struct wlr_pixman_render_pass *pass = calloc(1, sizeof(*pass));
+	if (pass == NULL) {
+		return NULL;
+	}
+
+	wlr_render_pass_init(&pass->base, &render_pass_impl);
+
+	if (!begin_pixman_data_ptr_access(buffer->buffer, &buffer->image,
+			WLR_BUFFER_DATA_PTR_ACCESS_READ | WLR_BUFFER_DATA_PTR_ACCESS_WRITE)) {
+		free(pass);
+		return NULL;
+	}
+
+	wlr_buffer_lock(buffer->buffer);
+	pass->buffer = buffer;
+
+	return pass;
+}

render/pixman/renderer.c

@@ -493,6 +493,25 @@ static uint32_t pixman_get_render_buffer_caps(struct wlr_renderer *renderer) {
 	return WLR_BUFFER_CAP_DATA_PTR;
 }
 
+static struct wlr_render_pass *pixman_begin_buffer_pass(struct wlr_renderer *wlr_renderer,
+		struct wlr_buffer *wlr_buffer) {
+	struct wlr_pixman_renderer *renderer = get_renderer(wlr_renderer);
+
+	struct wlr_pixman_buffer *buffer = get_buffer(renderer, wlr_buffer);
+	if (buffer == NULL) {
+		buffer = create_buffer(renderer, wlr_buffer);
+	}
+	if (buffer == NULL) {
+		return NULL;
+	}
+
+	struct wlr_pixman_render_pass *pass = begin_pixman_render_pass(buffer);
+	if (pass == NULL) {
+		return NULL;
+	}
+	return &pass->base;
+}
+
 static const struct wlr_renderer_impl renderer_impl = {
 	.begin = pixman_begin,
 	.end = pixman_end,
@@ -508,6 +527,7 @@ static const struct wlr_renderer_impl renderer_impl = {
 	.preferred_read_format = pixman_preferred_read_format,
 	.read_pixels = pixman_read_pixels,
 	.get_render_buffer_caps = pixman_get_render_buffer_caps,
+	.begin_buffer_pass = pixman_begin_buffer_pass,
 };
 
 struct wlr_renderer *wlr_pixman_renderer_create(void) {