void test_vtstu8 (void)
{
uint8x8_t out_uint8x8_t;
uint8x8_t arg0_uint8x8_t;
uint8x8_t arg1_uint8x8_t;
out_uint8x8_t = vtst_u8 (arg0_uint8x8_t, arg1_uint8x8_t);
}
void
ComputesRGBLuminanceMask_NEON(const uint8_t *aSourceData,
int32_t aSourceStride,
uint8_t *aDestData,
int32_t aDestStride,
const IntSize &aSize,
float aOpacity)
{
int32_t redFactor = 55 * aOpacity; // 255 * 0.2125 * opacity
int32_t greenFactor = 183 * aOpacity; // 255 * 0.7154 * opacity
int32_t blueFactor = 18 * aOpacity; // 255 * 0.0721
const uint8_t *sourcePixel = aSourceData;
int32_t sourceOffset = aSourceStride - 4 * aSize.width;
uint8_t *destPixel = aDestData;
int32_t destOffset = aDestStride - aSize.width;
sourcePixel = aSourceData;
int32_t remainderWidth = aSize.width % 8;
int32_t roundedWidth = aSize.width - remainderWidth;
uint16x8_t temp;
uint8x8_t gray;
uint8x8_t redVector = vdup_n_u8(redFactor);
uint8x8_t greenVector = vdup_n_u8(greenFactor);
uint8x8_t blueVector = vdup_n_u8(blueFactor);
uint8x8_t fullBitVector = vdup_n_u8(255);
uint8x8_t oneVector = vdup_n_u8(1);
for (int32_t y = 0; y < aSize.height; y++) {
// Calculate luminance by neon with 8 pixels per loop
for (int32_t x = 0; x < roundedWidth; x += 8) {
uint8x8x4_t argb = vld4_u8(sourcePixel);
temp = vmull_u8(argb.val[GFX_ARGB32_OFFSET_R], redVector); // temp = red * redFactor
temp = vmlal_u8(temp, argb.val[GFX_ARGB32_OFFSET_G], greenVector); // temp += green * greenFactor
temp = vmlal_u8(temp, argb.val[GFX_ARGB32_OFFSET_B], blueVector); // temp += blue * blueFactor
gray = vshrn_n_u16(temp, 8); // gray = temp >> 8
// Check alpha value
uint8x8_t alphaVector = vtst_u8(argb.val[GFX_ARGB32_OFFSET_A], fullBitVector);
gray = vmul_u8(gray, vand_u8(alphaVector, oneVector));
// Put the result to the 8 pixels
vst1_u8(destPixel, gray);
sourcePixel += 8 * 4;
destPixel += 8;
}
// Calculate the rest pixels of the line by cpu
for (int32_t x = 0; x < remainderWidth; x++) {
if (sourcePixel[GFX_ARGB32_OFFSET_A] > 0) {
*destPixel = (redFactor * sourcePixel[GFX_ARGB32_OFFSET_R]+
greenFactor * sourcePixel[GFX_ARGB32_OFFSET_G] +
blueFactor * sourcePixel[GFX_ARGB32_OFFSET_B]) >> 8;
} else {
*destPixel = 0;
}
sourcePixel += 4;
destPixel++;
}