static uint16_t get_argb4444_neighbor_avg_color(const SkBitmap& bitmap,
int xOrig, int yOrig) {
uint8_t count = 0;
uint8_t r = 0;
uint8_t g = 0;
uint8_t b = 0;
for (int y = yOrig - 1; y <= yOrig + 1; y++) {
if (y < 0 || y >= bitmap.height()) {
continue;
}
uint16_t* src = bitmap.getAddr16(0, y);
for (int x = xOrig - 1; x <= xOrig + 1; x++) {
if (x < 0 || x >= bitmap.width()) {
continue;
}
if ((SkGetPackedA4444(src[x]) & 0x0F) != SK_AlphaTRANSPARENT) {
uint16_t color = remove_alpha_argb4444(src[x]);
r += SkGetPackedR4444(color);
g += SkGetPackedG4444(color);
b += SkGetPackedB4444(color);
count++;
}
}
}
if (count == 0) {
return SkPackARGB4444(SK_AlphaOPAQUE & 0x0F, 0, 0, 0);
} else {
return SkPackARGB4444(SK_AlphaOPAQUE & 0x0F,
r / count, g / count, b / count);
}
}
static SkBitmap make_argb4444_gradient() {
SkBitmap bitmap;
init_bitmap(kARGB_4444_SkColorType, &bitmap);
uint8_t rowColor = 0;
for (int y = 0; y < SLIDE_SIZE; y++) {
uint16_t* dst = bitmap.getAddr16(0, y);
for (int x = 0; x < SLIDE_SIZE; x++) {
dst[x] = SkPackARGB4444(rowColor, rowColor,
rowColor, rowColor);
}
if (y % PIXEL_SIZE_4444 == PIXEL_SIZE_4444 - 1) {
rowColor++;
}
}
return bitmap;
}
static SkBitmap make_argb4444_stripes() {
SkBitmap bitmap;
init_bitmap(kARGB_4444_SkColorType, &bitmap);
uint8_t rowColor = 0;;
for (int y = 0; y < SLIDE_SIZE; y++) {
uint16_t* dst = bitmap.getAddr16(0, y);
for (int x = 0; x < SLIDE_SIZE; x++) {
dst[x] = SkPackARGB4444(rowColor, rowColor,
rowColor, rowColor);
}
if (rowColor == 0) {
rowColor = 15;
} else {
rowColor = 0;
}
}
return bitmap;
}