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sharpyuv: convert some for() to do/while

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With loops that don't use an immediate value in the conditional, this
can produce fewer tests.

Change-Id: I75401c51f7f7653be2f8c04d5f3c4ce04aefc3fc
This commit is contained in:
James Zern 2023-10-24 17:56:23 -07:00
parent f0cd786125
commit a429c0de64
1 changed files with 34 additions and 26 deletions
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60
sharpyuv/sharpyuv.c
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@ -90,8 +90,8 @@ static WEBP_INLINE void UpdateW(const fixed_y_t* src, fixed_y_t* dst, int w,
int rgb_bit_depth,
SharpYuvTransferFunctionType transfer_type) {
const int bit_depth = rgb_bit_depth + GetPrecisionShift(rgb_bit_depth);
int i;
for (i = 0; i < w; ++i) {
int i = 0;
do {
const uint32_t R =
SharpYuvGammaToLinear(src[0 * w + i], bit_depth, transfer_type);
const uint32_t G =
@ -100,14 +100,14 @@ static WEBP_INLINE void UpdateW(const fixed_y_t* src, fixed_y_t* dst, int w,
SharpYuvGammaToLinear(src[2 * w + i], bit_depth, transfer_type);
const uint32_t Y = RGBToGray(R, G, B);
dst[i] = (fixed_y_t)SharpYuvLinearToGamma(Y, bit_depth, transfer_type);
}
} while (++i < w);
}
static void UpdateChroma(const fixed_y_t* src1, const fixed_y_t* src2,
fixed_t* dst, int uv_w, int rgb_bit_depth,
SharpYuvTransferFunctionType transfer_type) {
int i;
for (i = 0; i < uv_w; ++i) {
int i = 0;
do {
const int r =
ScaleDown(src1[0 * uv_w + 0], src1[0 * uv_w + 1], src2[0 * uv_w + 0],
src2[0 * uv_w + 1], rgb_bit_depth, transfer_type);
@ -124,15 +124,15 @@ static void UpdateChroma(const fixed_y_t* src1, const fixed_y_t* src2,
dst += 1;
src1 += 2;
src2 += 2;
}
} while (++i < uv_w);
}
static void StoreGray(const fixed_y_t* rgb, fixed_y_t* y, int w) {
int i;
int i = 0;
assert(w > 0);
for (i = 0; i < w; ++i) {
do {
y[i] = RGBToGray(rgb[0 * w + i], rgb[1 * w + i], rgb[2 * w + i]);
}
} while (++i < w);
}
//------------------------------------------------------------------------------
@ -158,9 +158,9 @@ static void ImportOneRow(const uint8_t* const r_ptr,
// Convert the rgb_step from a number of bytes to a number of uint8_t or
// uint16_t values depending the bit depth.
const int step = (rgb_bit_depth > 8) ? rgb_step / 2 : rgb_step;
int i;
int i = 0;
const int w = (pic_width + 1) & ~1;
for (i = 0; i < pic_width; ++i) {
do {
const int off = i * step;
const int shift = GetPrecisionShift(rgb_bit_depth);
if (rgb_bit_depth == 8) {
@ -172,7 +172,7 @@ static void ImportOneRow(const uint8_t* const r_ptr,
dst[i + 1 * w] = Shift(((uint16_t*)g_ptr)[off], shift);
dst[i + 2 * w] = Shift(((uint16_t*)b_ptr)[off], shift);
}
}
} while (++i < pic_width);
if (pic_width & 1) { // replicate rightmost pixel
dst[pic_width + 0 * w] = dst[pic_width + 0 * w - 1];
dst[pic_width + 1 * w] = dst[pic_width + 1 * w - 1];
@ -240,8 +240,11 @@ static int ConvertWRGBToYUV(const fixed_y_t* best_y, const fixed_t* best_uv,
const int sfix = GetPrecisionShift(rgb_bit_depth);
const int yuv_max = (1 << yuv_bit_depth) - 1;
for (best_uv = best_uv_base, j = 0; j < height; ++j) {
for (i = 0; i < width; ++i) {
best_uv = best_uv_base;
j = 0;
do {
i = 0;
do {
const int off = (i >> 1);
const int W = best_y[i];
const int r = best_uv[off + 0 * uv_w] + W;
@ -253,19 +256,22 @@ static int ConvertWRGBToYUV(const fixed_y_t* best_y, const fixed_t* best_uv,
} else {
((uint16_t*)y_ptr)[i] = clip(y, yuv_max);
}
}
} while (++i < width);
best_y += w;
best_uv += (j & 1) * 3 * uv_w;
y_ptr += y_stride;
}
for (best_uv = best_uv_base, j = 0; j < uv_h; ++j) {
for (i = 0; i < uv_w; ++i) {
const int off = i;
} while (++j < height);
best_uv = best_uv_base;
j = 0;
do {
i = 0;
do {
// Note r, g and b values here are off by W, but a constant offset on all
// 3 components doesn't change the value of u and v with a YCbCr matrix.
const int r = best_uv[off + 0 * uv_w];
const int g = best_uv[off + 1 * uv_w];
const int b = best_uv[off + 2 * uv_w];
const int r = best_uv[i + 0 * uv_w];
const int g = best_uv[i + 1 * uv_w];
const int b = best_uv[i + 2 * uv_w];
const int u = RGBToYUVComponent(r, g, b, yuv_matrix->rgb_to_u, sfix);
const int v = RGBToYUVComponent(r, g, b, yuv_matrix->rgb_to_v, sfix);
if (yuv_bit_depth <= 8) {
@ -275,11 +281,11 @@ static int ConvertWRGBToYUV(const fixed_y_t* best_y, const fixed_t* best_uv,
((uint16_t*)u_ptr)[i] = clip(u, yuv_max);
((uint16_t*)v_ptr)[i] = clip(v, yuv_max);
}
}
} while (++i < uv_w);
best_uv += 3 * uv_w;
u_ptr += u_stride;
v_ptr += v_stride;
}
} while (++j < uv_h);
return 1;
}
@ -378,7 +384,8 @@ static int DoSharpArgbToYuv(const uint8_t* r_ptr, const uint8_t* g_ptr,
best_uv = best_uv_base;
target_y = target_y_base;
target_uv = target_uv_base;
for (j = 0; j < h; j += 2) {
j = 0;
do {
fixed_y_t* const src1 = tmp_buffer + 0 * w;
fixed_y_t* const src2 = tmp_buffer + 3 * w;
{
@ -402,7 +409,8 @@ static int DoSharpArgbToYuv(const uint8_t* r_ptr, const uint8_t* g_ptr,
best_uv += 3 * uv_w;
target_y += 2 * w;
target_uv += 3 * uv_w;
}
j += 2;
} while (j < h);
// test exit condition
if (iter > 0) {
if (diff_y_sum < diff_y_threshold) break;