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Add utilities for managing output transforms

pull/55/head
Andri Yngvason 2020-06-21 13:24:39 +00:00
parent 507b76dfbd
commit 6b1dc2e6c3
3 changed files with 216 additions and 118 deletions
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15
include/transform-util.h 100644
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@ -0,0 +1,15 @@
#pragma once
#include <wayland-client.h>
#include <pixman.h>
void wv_region_transform(struct pixman_region16 *dst,
struct pixman_region16 *src, enum wl_output_transform transform,
int width, int height);
void wv_pixman_transform_from_wl_output_transform(pixman_transform_t* dst,
enum wl_output_transform src, int width, int height);
enum wl_output_transform wv_output_transform_invert(enum wl_output_transform tr);
enum wl_output_transform wv_output_transform_compose(
enum wl_output_transform tr_a, enum wl_output_transform tr_b);

119
src/pixman-renderer.c
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@ -5,122 +5,7 @@
#include "buffer.h"
#include "pixels.h"
void pixman_transform_from_wl_output_transform(pixman_transform_t* dst,
enum wl_output_transform src, int width, int height)
{
#define F1 pixman_fixed_1
switch (src) {
case WL_OUTPUT_TRANSFORM_NORMAL:
{
pixman_transform_t t = {{
{ F1, 0, 0 },
{ 0, F1, 0 },
{ 0, 0, F1 },
}};
*dst = t;
}
return;
case WL_OUTPUT_TRANSFORM_90:
{
pixman_transform_t t = {{
{ 0, F1, 0 },
{ -F1, 0, height * F1 },
{ 0, 0, F1 },
}};
*dst = t;
}
return;
case WL_OUTPUT_TRANSFORM_180:
{
pixman_transform_t t = {{
{ -F1, 0, width * F1 },
{ 0, -F1, height * F1 },
{ 0, 0, F1 },
}};
*dst = t;
}
return;
case WL_OUTPUT_TRANSFORM_270:
{
pixman_transform_t t = {{
{ 0, -F1, width * F1 },
{ F1, 0, 0 },
{ 0, 0, F1 },
}};
*dst = t;
}
return;
case WL_OUTPUT_TRANSFORM_FLIPPED:
{
pixman_transform_t t = {{
{ -F1, 0, width * F1 },
{ 0, F1, 0 },
{ 0, 0, F1 },
}};
*dst = t;
}
return;
case WL_OUTPUT_TRANSFORM_FLIPPED_90:
{
pixman_transform_t t = {{
{ 0, F1, 0 },
{ F1, 0, 0 },
{ 0, 0, F1 },
}};
*dst = t;
}
return;
case WL_OUTPUT_TRANSFORM_FLIPPED_180:
{
pixman_transform_t t = {{
{ F1, 0, 0 },
{ 0, -F1, height * F1 },
{ 0, 0, F1 },
}};
*dst = t;
}
return;
case WL_OUTPUT_TRANSFORM_FLIPPED_270:
{
pixman_transform_t t = {{
{ 0, -F1, width * F1 },
{ -F1, 0, height * F1 },
{ 0, 0, F1 },
}};
*dst = t;
}
return;
}
#undef F1
abort();
}
/* Borrowed these from wlroots */
enum wl_output_transform wv_output_transform_invert(
enum wl_output_transform tr) {
if ((tr & WL_OUTPUT_TRANSFORM_90) && !(tr & WL_OUTPUT_TRANSFORM_FLIPPED)) {
tr ^= WL_OUTPUT_TRANSFORM_180;
}
return tr;
}
enum wl_output_transform wv_output_transform_compose(
enum wl_output_transform tr_a, enum wl_output_transform tr_b) {
uint32_t flipped = (tr_a ^ tr_b) & WL_OUTPUT_TRANSFORM_FLIPPED;
uint32_t rotation_mask = WL_OUTPUT_TRANSFORM_90 | WL_OUTPUT_TRANSFORM_180;
uint32_t rotated;
if (tr_b & WL_OUTPUT_TRANSFORM_FLIPPED) {
// When a rotation of k degrees is followed by a flip, the
// equivalent transform is a flip followed by a rotation of
// -k degrees.
rotated = (tr_b - tr_a) & rotation_mask;
} else {
rotated = (tr_a + tr_b) & rotation_mask;
}
return flipped | rotated;
}
#include "transform-util.h"
void wv_pixman_render(struct nvnc_fb* dst, const struct wv_buffer* src,
enum wl_output_transform transform,
@ -145,7 +30,7 @@ void wv_pixman_render(struct nvnc_fb* dst, const struct wv_buffer* src,
WL_OUTPUT_TRANSFORM_FLIPPED_180, transform);
pixman_transform_t pxform;
pixman_transform_from_wl_output_transform(&pxform, transform, width,
wv_pixman_transform_from_wl_output_transform(&pxform, transform, width,
height);
pixman_image_set_transform(srcimg, &pxform);

198
src/transform-util.c 100644
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@ -0,0 +1,198 @@
#include <stdlib.h>
#include <wayland-client.h>
#include <pixman.h>
/* Note: This function yields the inverse pixman transform of the
* wl_output_transform.
*/
void wv_pixman_transform_from_wl_output_transform(pixman_transform_t* dst,
enum wl_output_transform src, int width, int height)
{
#define F1 pixman_fixed_1
switch (src) {
case WL_OUTPUT_TRANSFORM_NORMAL:
{
pixman_transform_t t = {{
{ F1, 0, 0 },
{ 0, F1, 0 },
{ 0, 0, F1 },
}};
*dst = t;
}
return;
case WL_OUTPUT_TRANSFORM_90:
{
pixman_transform_t t = {{
{ 0, F1, 0 },
{ -F1, 0, height * F1 },
{ 0, 0, F1 },
}};
*dst = t;
}
return;
case WL_OUTPUT_TRANSFORM_180:
{
pixman_transform_t t = {{
{ -F1, 0, width * F1 },
{ 0, -F1, height * F1 },
{ 0, 0, F1 },
}};
*dst = t;
}
return;
case WL_OUTPUT_TRANSFORM_270:
{
pixman_transform_t t = {{
{ 0, -F1, width * F1 },
{ F1, 0, 0 },
{ 0, 0, F1 },
}};
*dst = t;
}
return;
case WL_OUTPUT_TRANSFORM_FLIPPED:
{
pixman_transform_t t = {{
{ -F1, 0, width * F1 },
{ 0, F1, 0 },
{ 0, 0, F1 },
}};
*dst = t;
}
return;
case WL_OUTPUT_TRANSFORM_FLIPPED_90:
{
pixman_transform_t t = {{
{ 0, F1, 0 },
{ F1, 0, 0 },
{ 0, 0, F1 },
}};
*dst = t;
}
return;
case WL_OUTPUT_TRANSFORM_FLIPPED_180:
{
pixman_transform_t t = {{
{ F1, 0, 0 },
{ 0, -F1, height * F1 },
{ 0, 0, F1 },
}};
*dst = t;
}
return;
case WL_OUTPUT_TRANSFORM_FLIPPED_270:
{
pixman_transform_t t = {{
{ 0, -F1, width * F1 },
{ -F1, 0, height * F1 },
{ 0, 0, F1 },
}};
*dst = t;
}
return;
}
#undef F1
abort();
}
/* Borrowed these from wlroots */
void wv_region_transform(struct pixman_region16* dst,
struct pixman_region16* src, enum wl_output_transform transform,
int width, int height)
{
if (transform == WL_OUTPUT_TRANSFORM_NORMAL) {
pixman_region_copy(dst, src);
return;
}
int nrects = 0;
pixman_box16_t* src_rects = pixman_region_rectangles(src, &nrects);
pixman_box16_t* dst_rects = malloc(nrects * sizeof(*dst_rects));
if (dst_rects == NULL) {
return;
}
for (int i = 0; i < nrects; ++i) {
switch (transform) {
case WL_OUTPUT_TRANSFORM_NORMAL:
dst_rects[i].x1 = src_rects[i].x1;
dst_rects[i].y1 = src_rects[i].y1;
dst_rects[i].x2 = src_rects[i].x2;
dst_rects[i].y2 = src_rects[i].y2;
break;
case WL_OUTPUT_TRANSFORM_90:
dst_rects[i].x1 = height - src_rects[i].y2;
dst_rects[i].y1 = src_rects[i].x1;
dst_rects[i].x2 = height - src_rects[i].y1;
dst_rects[i].y2 = src_rects[i].x2;
break;
case WL_OUTPUT_TRANSFORM_180:
dst_rects[i].x1 = width - src_rects[i].x2;
dst_rects[i].y1 = height - src_rects[i].y2;
dst_rects[i].x2 = width - src_rects[i].x1;
dst_rects[i].y2 = height - src_rects[i].y1;
break;
case WL_OUTPUT_TRANSFORM_270:
dst_rects[i].x1 = src_rects[i].y1;
dst_rects[i].y1 = width - src_rects[i].x2;
dst_rects[i].x2 = src_rects[i].y2;
dst_rects[i].y2 = width - src_rects[i].x1;
break;
case WL_OUTPUT_TRANSFORM_FLIPPED:
dst_rects[i].x1 = width - src_rects[i].x2;
dst_rects[i].y1 = src_rects[i].y1;
dst_rects[i].x2 = width - src_rects[i].x1;
dst_rects[i].y2 = src_rects[i].y2;
break;
case WL_OUTPUT_TRANSFORM_FLIPPED_90:
dst_rects[i].x1 = src_rects[i].y1;
dst_rects[i].y1 = src_rects[i].x1;
dst_rects[i].x2 = src_rects[i].y2;
dst_rects[i].y2 = src_rects[i].x2;
break;
case WL_OUTPUT_TRANSFORM_FLIPPED_180:
dst_rects[i].x1 = src_rects[i].x1;
dst_rects[i].y1 = height - src_rects[i].y2;
dst_rects[i].x2 = src_rects[i].x2;
dst_rects[i].y2 = height - src_rects[i].y1;
break;
case WL_OUTPUT_TRANSFORM_FLIPPED_270:
dst_rects[i].x1 = height - src_rects[i].y2;
dst_rects[i].y1 = width - src_rects[i].x2;
dst_rects[i].x2 = height - src_rects[i].y1;
dst_rects[i].y2 = width - src_rects[i].x1;
break;
}
}
pixman_region_fini(dst);
pixman_region_init_rects(dst, dst_rects, nrects);
free(dst_rects);
}
enum wl_output_transform wv_output_transform_invert(enum wl_output_transform tr)
{
if ((tr & WL_OUTPUT_TRANSFORM_90) && !(tr & WL_OUTPUT_TRANSFORM_FLIPPED)) {
tr ^= WL_OUTPUT_TRANSFORM_180;
}
return tr;
}
enum wl_output_transform wv_output_transform_compose(
enum wl_output_transform tr_a, enum wl_output_transform tr_b)
{
uint32_t flipped = (tr_a ^ tr_b) & WL_OUTPUT_TRANSFORM_FLIPPED;
uint32_t rotation_mask = WL_OUTPUT_TRANSFORM_90 | WL_OUTPUT_TRANSFORM_180;
uint32_t rotated;
if (tr_b & WL_OUTPUT_TRANSFORM_FLIPPED) {
// When a rotation of k degrees is followed by a flip, the
// equivalent transform is a flip followed by a rotation of
// -k degrees.
rotated = (tr_b - tr_a) & rotation_mask;
} else {
rotated = (tr_a + tr_b) & rotation_mask;
}
return flipped | rotated;
}