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pixel-buffer: Add the concept of device rotation

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On some devices the LCD panel is mounted in the casing in such a way
that the up/top side of the panel does not match with the top side of
the device (e.g. it is mounted upside-down).

This commit adds support to the ply-pixel-buffer code to create
buffers which take device rotation into account and which will rotate
the picture to compensate.

https://bugs.freedesktop.org/show_bug.cgi?id=104714
This commit is contained in:
Hans de Goede 2017-12-06 17:37:12 +01:00 • committed by Ray Strode
parent da27e42316
commit 0e4e268844
2 changed files with 110 additions and 8 deletions
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109
src/libply-splash-core/ply-pixel-buffer.c
View file

@ -50,6 +50,7 @@ struct _ply_pixel_buffer
ply_region_t *updated_areas; /* in device pixels */
uint32_t is_opaque : 1;
int device_scale;
int device_rotation;
};
static inline void ply_pixel_buffer_blend_value_at_pixel (ply_pixel_buffer_t *buffer,
@ -153,6 +154,52 @@ make_pixel_value_translucent (uint32_t pixel_value,
return (alpha << 24) | (red << 16) | (green << 8) | blue;
}
static inline void ply_pixel_buffer_set_pixel (ply_pixel_buffer_t *buffer,
int x,
int y,
uint32_t pixel_value)
{
switch (buffer->device_rotation) {
case PLY_PIXEL_BUFFER_ROTATE_UPRIGHT:
buffer->bytes[y * buffer->area.width + x] = pixel_value;
break;
case PLY_PIXEL_BUFFER_ROTATE_UPSIDE_DOWN:
x = (buffer->area.width - 1) - x;
y = (buffer->area.height - 1) - y;
buffer->bytes[y * buffer->area.width + x] = pixel_value;
break;
case PLY_PIXEL_BUFFER_ROTATE_CLOCKWISE:
y = (buffer->area.height - 1) - y;
buffer->bytes[x * buffer->area.height + y] = pixel_value;
break;
case PLY_PIXEL_BUFFER_ROTATE_COUNTER_CLOCKWISE:
x = (buffer->area.width - 1) - x;
buffer->bytes[x * buffer->area.height + y] = pixel_value;
break;
}
}
static inline uint32_t ply_pixel_buffer_get_pixel (ply_pixel_buffer_t *buffer,
int x,
int y)
{
switch (buffer->device_rotation) {
case PLY_PIXEL_BUFFER_ROTATE_UPRIGHT:
return buffer->bytes[y * buffer->area.width + x];
case PLY_PIXEL_BUFFER_ROTATE_UPSIDE_DOWN:
x = (buffer->area.width - 1) - x;
y = (buffer->area.height - 1) - y;
return buffer->bytes[y * buffer->area.width + x];
case PLY_PIXEL_BUFFER_ROTATE_CLOCKWISE:
y = (buffer->area.height - 1) - y;
return buffer->bytes[x * buffer->area.height + y];
case PLY_PIXEL_BUFFER_ROTATE_COUNTER_CLOCKWISE:
x = (buffer->area.width - 1) - x;
return buffer->bytes[x * buffer->area.height + y];
}
return 0;
}
static inline void
ply_pixel_buffer_blend_value_at_pixel (ply_pixel_buffer_t *buffer,
int x,
@ -162,12 +209,12 @@ ply_pixel_buffer_blend_value_at_pixel (ply_pixel_buffer_t *buffer,
uint32_t old_pixel_value;
if ((pixel_value >> 24) != 0xff) {
old_pixel_value = buffer->bytes[y * buffer->area.width + x];
old_pixel_value = ply_pixel_buffer_get_pixel (buffer, x, y);
pixel_value = blend_two_pixel_values (pixel_value, old_pixel_value);
}
buffer->bytes[y * buffer->area.width + x] = pixel_value;
ply_pixel_buffer_set_pixel (buffer, x, y, pixel_value);
}
static void
@ -222,6 +269,35 @@ ply_pixel_buffer_crop_area_to_clip_area (ply_pixel_buffer_t *buffer,
}
}
static void ply_pixel_buffer_add_updated_area (ply_pixel_buffer_t *buffer,
ply_rectangle_t *area)
{
ply_rectangle_t updated_area = *area;
switch (buffer->device_rotation) {
case PLY_PIXEL_BUFFER_ROTATE_UPRIGHT:
break;
case PLY_PIXEL_BUFFER_ROTATE_UPSIDE_DOWN:
updated_area.x = buffer->area.width - area->width - area->x;
updated_area.y = buffer->area.height - area->height - area->y;
break;
case PLY_PIXEL_BUFFER_ROTATE_CLOCKWISE:
updated_area.x = buffer->area.height - area->height - area->y;
updated_area.y = area->x;
updated_area.height = area->width;
updated_area.width = area->height;
break;
case PLY_PIXEL_BUFFER_ROTATE_COUNTER_CLOCKWISE:
updated_area.x = area->y;
updated_area.y = buffer->area.width - area->width - area->x;
updated_area.height = area->width;
updated_area.width = area->height;
break;
}
ply_region_add_rectangle (buffer->updated_areas, &updated_area);
}
static void
ply_pixel_buffer_fill_area_with_pixel_value (ply_pixel_buffer_t *buffer,
ply_rectangle_t *fill_area,
@ -251,7 +327,7 @@ ply_pixel_buffer_fill_area_with_pixel_value (ply_pixel_buffer_t *buffer,
}
}
ply_region_add_rectangle (buffer->updated_areas, &cropped_area);
ply_pixel_buffer_add_updated_area (buffer, &cropped_area);
}
void
@ -281,9 +357,24 @@ ply_pixel_buffer_pop_clip_area (ply_pixel_buffer_t *buffer)
ply_pixel_buffer_t *
ply_pixel_buffer_new (unsigned long width,
unsigned long height)
{
return ply_pixel_buffer_new_with_device_rotation (
width, height, PLY_PIXEL_BUFFER_ROTATE_UPRIGHT);
}
ply_pixel_buffer_t *
ply_pixel_buffer_new_with_device_rotation (unsigned long width,
unsigned long height,
int device_rotation)
{
ply_pixel_buffer_t *buffer;
if (device_rotation >= PLY_PIXEL_BUFFER_ROTATE_CLOCKWISE) {
unsigned long tmp = width;
width = height;
height = tmp;
}
buffer = calloc (1, sizeof(ply_pixel_buffer_t));
buffer->updated_areas = ply_region_new ();
@ -292,6 +383,7 @@ ply_pixel_buffer_new (unsigned long width,
buffer->area.height = height;
buffer->logical_area = buffer->area;
buffer->device_scale = 1;
buffer->device_rotation = device_rotation;
buffer->clip_areas = ply_list_new ();
ply_pixel_buffer_push_clip_area (buffer, &buffer->area);
@ -447,7 +539,7 @@ ply_pixel_buffer_fill_with_gradient (ply_pixel_buffer_t *buffer,
for (y = buffer->area.y; y < buffer->area.y + buffer->area.height; y++) {
if (cropped_area.y <= y && y < cropped_area.y + cropped_area.height) {
if (cropped_area.width < UNROLLED_PIXEL_COUNT) {
if (cropped_area.width < UNROLLED_PIXEL_COUNT || buffer->device_rotation) {
for (x = cropped_area.x; x < cropped_area.x + cropped_area.width; x++) {
pixel = 0xff000000;
RANDOMIZE (noise);
@ -457,7 +549,7 @@ ply_pixel_buffer_fill_with_gradient (ply_pixel_buffer_t *buffer,
RANDOMIZE (noise);
pixel |= (((blue + noise) & COLOR_MASK) >> BLUE_SHIFT);
buffer->bytes[y * buffer->area.width + x] = pixel;
ply_pixel_buffer_set_pixel (buffer, x, y, pixel);
}
} else {
uint32_t shaded_set[UNROLLED_PIXEL_COUNT];
@ -485,7 +577,7 @@ ply_pixel_buffer_fill_with_gradient (ply_pixel_buffer_t *buffer,
blue += blue_step;
}
ply_region_add_rectangle (buffer->updated_areas, &cropped_area);
ply_pixel_buffer_add_updated_area (buffer, &cropped_area);
}
void
@ -671,7 +763,7 @@ ply_pixel_buffer_fill_with_argb32_data_at_opacity_with_clip_and_scale (ply_pixel
}
}
ply_region_add_rectangle (buffer->updated_areas, &cropped_area);
ply_pixel_buffer_add_updated_area (buffer, &cropped_area);
}
void
@ -756,7 +848,8 @@ ply_pixel_buffer_fill_with_buffer_at_opacity_with_clip (ply_pixel_buffer_t *canv
/* Fast path to memcpy if we need no blending or scaling */
if (opacity == 1.0 && ply_pixel_buffer_is_opaque (source) &&
canvas->device_scale == source->device_scale) {
canvas->device_scale == source->device_scale &&
canvas->device_rotation == PLY_PIXEL_BUFFER_ROTATE_UPRIGHT) {
ply_rectangle_t cropped_area;
cropped_area.x = x_offset;

9
src/libply-splash-core/ply-pixel-buffer.h
View file

@ -37,9 +37,18 @@ typedef struct _ply_pixel_buffer ply_pixel_buffer_t;
| ((uint8_t) (CLAMP (g * 255.0, 0.0, 255.0)) << 8) \
| ((uint8_t) (CLAMP (b * 255.0, 0.0, 255.0))))
#define PLY_PIXEL_BUFFER_ROTATE_UPRIGHT 0
#define PLY_PIXEL_BUFFER_ROTATE_UPSIDE_DOWN 1
#define PLY_PIXEL_BUFFER_ROTATE_CLOCKWISE 2
#define PLY_PIXEL_BUFFER_ROTATE_COUNTER_CLOCKWISE 3
#ifndef PLY_HIDE_FUNCTION_DECLARATIONS
ply_pixel_buffer_t *ply_pixel_buffer_new (unsigned long width,
unsigned long height);
ply_pixel_buffer_t *
ply_pixel_buffer_new_with_device_rotation (unsigned long width,
unsigned long height,
int device_rotation);
void ply_pixel_buffer_free (ply_pixel_buffer_t *buffer);
void ply_pixel_buffer_get_size (ply_pixel_buffer_t *buffer,
ply_rectangle_t *size);