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-rw-r--r--payloads/libpayload/drivers/video/graphics.c196
-rw-r--r--payloads/libpayload/include/cbgfx.h50
2 files changed, 159 insertions, 87 deletions
diff --git a/payloads/libpayload/drivers/video/graphics.c b/payloads/libpayload/drivers/video/graphics.c
index 5f1dab7308..d9c731b064 100644
--- a/payloads/libpayload/drivers/video/graphics.c
+++ b/payloads/libpayload/drivers/video/graphics.c
@@ -14,8 +14,8 @@
* non-drawing areas on the left and right. The screen is assumed to be
* landscape.
*/
-static struct vector canvas;
-static uint32_t canvas_offset; /* horizontal position of canvas */
+static struct rect canvas;
+static struct rect screen;
/*
* Framebuffer is assumed to assign a higher coordinate (larger x, y) to
@@ -34,9 +34,14 @@ static char initialized = 0;
*/
#define BITMAP_SCALE_BASE 256
-#define ROUNDUP(x, y) ((x) + ((y) - ((x) % (y))))
+#define ROUNDUP(x, y) ((((x) + ((y) - 1)) / (y)) * (y))
#define ABS(x) ((x) < 0 ? -(x) : (x))
+static const struct vector vzero = {
+ .x = 0,
+ .y = 0,
+};
+
static void add_vectors(struct vector *out,
const struct vector *v1, const struct vector *v2)
{
@@ -44,27 +49,31 @@ static void add_vectors(struct vector *out,
out->y = v1->y + v2->y;
}
-static void scale_vector(struct vector *out, const struct vector *in,
- size_t scale, size_t base)
-{
- out->x = in->x * scale / base;
- out->y = in->y * scale / base;
-}
-
-static void to_canvas(const struct vector *relative, struct vector *absolute)
+/*
+ * Transform a vector:
+ * x' = x * a_x + offset_x
+ * y' = y * a_y + offset_y
+ */
+static void transform_vector(struct vector *out,
+ const struct vector *in,
+ const struct scale *a,
+ const struct vector *offset)
{
- absolute->x = canvas.width * relative->x / CANVAS_SCALE;
- absolute->y = canvas.height * relative->y / CANVAS_SCALE;
+ out->x = a->x.nume * in->x / a->x.deno + offset->x;
+ out->y = a->y.nume * in->y / a->y.deno + offset->y;
}
/*
- * Returns 1 if exclusively within canvas, or 0 if inclusively within canvas.
+ * Returns 1 if v is exclusively within box, 0 if v is inclusively within box,
+ * or -1 otherwise. Note that only the left and bottom edges are considered.
*/
-static int within_canvas(const struct vector *v)
+static int within_box(const struct vector *v, const struct rect *bound)
{
- if (v->x < canvas.width && v->y < canvas.height)
+ if (v->x < bound->offset.x + bound->size.width &&
+ v->y < bound->offset.y + bound->size.height)
return 1;
- else if (v->x <= canvas.width && v->y <= canvas.height)
+ else if (v->x <= bound->offset.x + bound->size.width &&
+ v->y <= bound->offset.y + bound->size.height)
return 0;
else
return -1;
@@ -90,7 +99,7 @@ static inline void set_pixel(struct vector *coord, uint32_t color)
{
const int bpp = fbinfo->bits_per_pixel;
int i;
- uint8_t * const pixel = fbaddr + (coord->x + canvas_offset +
+ uint8_t * const pixel = fbaddr + (coord->x +
coord->y * fbinfo->x_resolution) * bpp / 8;
for (i = 0; i < bpp / 8; i++)
pixel[i] = (color >> (i * 8));
@@ -113,40 +122,53 @@ static int cbgfx_init(void)
if (!fbaddr)
return -1;
- /* calculate canvas size, assuming the screen is landscape */
- canvas.height = fbinfo->y_resolution;
- canvas.width = canvas.height;
- canvas_offset = (fbinfo->x_resolution - canvas.width) / 2;
- if (canvas_offset < 0) {
- LOG("Portrait screens are not supported\n");
+ screen.size.width = fbinfo->x_resolution;
+ screen.size.height = fbinfo->y_resolution;
+ screen.offset.x = 0;
+ screen.offset.y = 0;
+
+ /* Calculate canvas size & offset, assuming the screen is landscape */
+ if (screen.size.height > screen.size.width) {
+ LOG("Portrait screen not supported\n");
return -1;
}
+ canvas.size.height = screen.size.height;
+ canvas.size.width = canvas.size.height;
+ canvas.offset.x = (screen.size.width - canvas.size.width) / 2;
+ canvas.offset.y = 0;
initialized = 1;
- LOG("cbgfx initialized: canvas width=%d, height=%d, offset=%d\n",
- canvas.width, canvas.height, canvas_offset);
+ LOG("cbgfx initialized: screen:width=%d, height=%d, offset=%d canvas:width=%d, height=%d, offset=%d\n",
+ screen.size.width, screen.size.height, screen.offset.x,
+ canvas.size.width, canvas.size.height, canvas.offset.x);
return 0;
}
-int draw_box(const struct vector *top_left_rel,
- const struct vector *size_rel,
- const struct rgb_color *rgb)
+int draw_box(const struct rect *box, const struct rgb_color *rgb)
{
struct vector top_left;
struct vector size;
struct vector p, t;
const uint32_t color = calculate_color(rgb);
+ const struct scale top_left_s = {
+ .x = { .nume = box->offset.x, .deno = CANVAS_SCALE, },
+ .y = { .nume = box->offset.y, .deno = CANVAS_SCALE, }
+ };
+ const struct scale size_s = {
+ .x = { .nume = box->size.x, .deno = CANVAS_SCALE, },
+ .y = { .nume = box->size.y, .deno = CANVAS_SCALE, }
+ };
if (cbgfx_init())
return CBGFX_ERROR_INIT;
- to_canvas(top_left_rel, &top_left);
- to_canvas(size_rel, &size);
+ transform_vector(&top_left, &canvas.size, &top_left_s, &canvas.offset);
+ transform_vector(&size, &canvas.size, &size_s, &vzero);
add_vectors(&t, &top_left, &size);
- if (within_canvas(&t) < 0) {
+ if (within_box(&t, &canvas) < 0) {
LOG("Box exceeds canvas boundary\n");
- return CBGFX_ERROR_BOUNDARY;
+ return CBGFX_ERROR_CANVAS_BOUNDARY;
}
for (p.y = top_left.y; p.y < t.y; p.y++)
@@ -158,23 +180,40 @@ int draw_box(const struct vector *top_left_rel,
int clear_canvas(struct rgb_color *rgb)
{
- const struct vector coord = {
- .x = 0,
- .y = 0,
- };
- const struct vector size = {
- .width = CANVAS_SCALE,
- .height = CANVAS_SCALE,
+ const struct rect box = {
+ vzero,
+ .size = {
+ .width = CANVAS_SCALE,
+ .height = CANVAS_SCALE,
+ },
};
if (cbgfx_init())
return CBGFX_ERROR_INIT;
- return draw_box(&coord, &size, rgb);
+ return draw_box(&box, rgb);
+}
+
+/*
+ * This check guarantees we will not try to read outside pixel data.
+ */
+static int check_bound(const struct vector *image,
+ const struct bitmap_header_v3 *header,
+ const struct scale *scale)
+{
+ struct vector p = {
+ .x = (image->width - 1) * scale->x.deno / scale->x.nume,
+ .y = (image->height -1) * scale->y.deno / scale->y.nume,
+ };
+ struct rect bound = {
+ .offset = vzero,
+ .size = { .width = header->width, .height = header->height, },
+ };
+ return within_box(&p, &bound) < 0;
}
static int draw_bitmap_v3(const struct vector *top_left,
- size_t scale,
+ const struct scale *scale,
const struct vector *image,
const struct bitmap_header_v3 *header,
const struct bitmap_palette_element_v3 *palette,
@@ -196,11 +235,14 @@ static int draw_bitmap_v3(const struct vector *top_left,
LOG("Unsupported bits per pixel: %d\n", bpp);
return CBGFX_ERROR_BITMAP_FORMAT;
}
- if (scale == 0) {
+ if (scale->x.nume == 0 || scale->y.nume == 0) {
LOG("Scaling out of range\n");
return CBGFX_ERROR_SCALE_OUT_OF_RANGE;
}
+ if (check_bound(image, header, scale))
+ return CBGFX_ERROR_SCALE_OUT_OF_RANGE;
+
const int32_t y_stride = ROUNDUP(header->width * bpp / 8, 4);
/*
* header->height can be positive or negative.
@@ -225,18 +267,11 @@ static int draw_bitmap_v3(const struct vector *top_left,
*/
struct vector s, d;
for (d.y = 0; d.y < image->height; d.y++, p.y += dir) {
- s.y = d.y * BITMAP_SCALE_BASE / scale;
+ s.y = d.y * scale->y.deno / scale->y.nume;
const uint8_t *data = pixel_array + s.y * y_stride;
p.x = top_left->x;
for (d.x = 0; d.x < image->width; d.x++, p.x++) {
- s.x = d.x * BITMAP_SCALE_BASE / scale;
- if (s.y * y_stride + s.x > header->size)
- /*
- * Because we're handling integers rounded by
- * divisions, we might get here legitimately
- * when rendering the last row of a sane image.
- */
- return CBGFX_SUCCESS;
+ s.x = d.x * scale->x.deno / scale->x.nume;
uint8_t index = data[s.x];
if (index >= header->colors_used) {
LOG("Color index exceeds palette boundary\n");
@@ -279,11 +314,11 @@ static int get_bitmap_file_header(const void *bitmap, size_t size,
}
static int parse_bitmap_header_v3(const uint8_t *bitmap,
- const struct bitmap_file_header *file_header,
- /* ^--- IN / OUT ---v */
- struct bitmap_header_v3 *header,
- const struct bitmap_palette_element_v3 **palette,
- const uint8_t **pixel_array)
+ const struct bitmap_file_header *file_header,
+ /* ^--- IN / OUT ---v */
+ struct bitmap_header_v3 *header,
+ const struct bitmap_palette_element_v3 **palette,
+ const uint8_t **pixel_array)
{
struct bitmap_header_v3 *h;
size_t header_offset = sizeof(struct bitmap_file_header);
@@ -339,8 +374,9 @@ int draw_bitmap(const struct vector *top_left_rel,
struct bitmap_header_v3 header;
const struct bitmap_palette_element_v3 *palette;
const uint8_t *pixel_array;
- struct vector top_left, t, image;
- size_t scale;
+ struct vector top_left, image;
+ struct scale scale;
+ struct vector t;
int rv;
if (cbgfx_init())
@@ -356,25 +392,43 @@ int draw_bitmap(const struct vector *top_left_rel,
if (rv)
return rv;
- /* convert relative coordinate to canvas coordinate */
- to_canvas(top_left_rel, &top_left);
-
- /* convert canvas scale to self scale (relative to image width) */
- scale = scale_rel * canvas.width * BITMAP_SCALE_BASE /
- (CANVAS_SCALE * header.width);
+ /*
+ * Calculate absolute coordinate and self-scale (scale relative to image
+ * size). If relative scale is zero, the image is displayed at the
+ * original scale and tol_left_rel is treated as absolute coordinate.
+ */
+ if (scale_rel) {
+ const struct scale s = {
+ .x = { .nume = top_left_rel->x, .deno = CANVAS_SCALE, },
+ .y = { .nume = top_left_rel->y, .deno = CANVAS_SCALE, },
+ };
+ transform_vector(&top_left, &canvas.size, &s, &canvas.offset);
+ scale.x.nume = scale_rel * canvas.size.width;
+ scale.x.deno = header.width * CANVAS_SCALE;
+ } else {
+ add_vectors(&top_left, top_left_rel, &vzero);
+ scale.x.nume = 1;
+ scale.x.deno = 1;
+ }
+ scale.y.nume = scale.x.nume;
+ scale.y.deno = scale.x.deno;
- /* calculate height and width of the image on canvas */
+ /* Calculate height and width of the image on screen */
image.width = header.width;
image.height = ABS(header.height);
- scale_vector(&image, &image, scale, BITMAP_SCALE_BASE);
+ transform_vector(&image, &image, &scale, &vzero);
- /* check whether right bottom corner exceeds canvas boundaries or not */
+ /* Check whether the right bottom corner is within screen and canvas */
add_vectors(&t, &image, &top_left);
- if (within_canvas(&t) < 0) {
+ if (scale_rel && within_box(&t, &canvas) < 0) {
LOG("Bitmap image exceeds canvas boundary\n");
- return CBGFX_ERROR_BOUNDARY;
+ return CBGFX_ERROR_CANVAS_BOUNDARY;
+ }
+ if (within_box(&t, &screen) < 0) {
+ LOG("Bitmap image exceeds screen boundary\n");
+ return CBGFX_ERROR_SCREEN_BOUNDARY;
}
- return draw_bitmap_v3(&top_left, scale, &image,
+ return draw_bitmap_v3(&top_left, &scale, &image,
&header, palette, pixel_array);
}
diff --git a/payloads/libpayload/include/cbgfx.h b/payloads/libpayload/include/cbgfx.h
index 074a42d408..2d6b6e938a 100644
--- a/payloads/libpayload/include/cbgfx.h
+++ b/payloads/libpayload/include/cbgfx.h
@@ -11,13 +11,15 @@
/*
* API error codes
*/
-#define CBGFX_SUCCESS 0
+#define CBGFX_SUCCESS 0
/* unknown error */
-#define CBGFX_ERROR_UNKNOWN 1
+#define CBGFX_ERROR_UNKNOWN 1
/* failed to initialize cbgfx library */
-#define CBGFX_ERROR_INIT 2
+#define CBGFX_ERROR_INIT 2
+/* drawing beyond screen boundary */
+#define CBGFX_ERROR_SCREEN_BOUNDARY 3
/* drawing beyond canvas boundary */
-#define CBGFX_ERROR_BOUNDARY 3
+#define CBGFX_ERROR_CANVAS_BOUNDARY 4
/* bitmap error: signature mismatch */
#define CBGFX_ERROR_BITMAP_SIGNATURE 0x10
/* bitmap error: unsupported format */
@@ -27,17 +29,32 @@
/* bitmap error: scaling out of range */
#define CBGFX_ERROR_SCALE_OUT_OF_RANGE 0x13
+struct fraction {
+ int32_t nume;
+ int32_t deno;
+};
+
+struct scale {
+ struct fraction x;
+ struct fraction y;
+};
+
struct vector {
union {
- uint32_t x;
- uint32_t width;
+ int32_t x;
+ int32_t width;
};
union {
- uint32_t y;
- uint32_t height;
+ int32_t y;
+ int32_t height;
};
};
+struct rect {
+ struct vector offset;
+ struct vector size;
+};
+
struct rgb_color {
uint8_t red;
uint8_t green;
@@ -59,16 +76,14 @@ struct rgb_color {
/*
* draw a box filled with a color on screen
*
- * top_left_rel: coordinate of top left corner of the box, relative to canvas.
- * (0 - CANVAS_SCALE).
- * size_rel: width and height of the box, relative to canvas. (0 - CANVAS_SCALE)
+ * box: .offset points the coordinate of the top left corner and .size specifies
+ * width and height of the box. Both are relative to the canvas size thus scale
+ * from 0 to CANVAS_SCALE (0 to 100%).
* rgb: RGB color of the box.
*
* return: CBGFX_* error codes
*/
-int draw_box(const struct vector *top_left_rel,
- const struct vector *size_rel,
- const struct rgb_color *rgb);
+int draw_box(const struct rect *box, const struct rgb_color *rgb);
/*
* Clear the canvas
@@ -79,8 +94,11 @@ int clear_canvas(struct rgb_color *rgb);
* Draw a bitmap image on screen.
*
* top_left_rel: coordinate of the top left corner of the image relative to the
- * canvas (0 - CANVAS_SCALE).
- * scale_rel: scale factor relative to the canvas width (0 - CANVAS_SCALE).
+ * canvas (0 - CANVAS_SCALE). If scale_rel is zero, this is treated as absolute
+ * coordinate.
+ * scale_rel: scale factor relative to the canvas width (0 - CANVAS_SCALE). If
+ * this is zero, scaling is turned off and the image is rendered with the
+ * original size.
* bitmap: pointer to the bitmap data, starting from the file header.
* size: size of the bitmap data
*
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-27 02:54:02 +0000