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Unified Diff: src/codec/SkSwizzler.cpp

Issue 1260673002: SkScaledCodec class (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: Created 5 years, 5 months ago
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« src/codec/SkSwizzler.h ('K') | « src/codec/SkSwizzler.h ('k') | no next file » | no next file with comments »
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Index: src/codec/SkSwizzler.cpp
diff --git a/src/codec/SkSwizzler.cpp b/src/codec/SkSwizzler.cpp
index 71cb82a08bc5803fd6f8877044b452a3d1591cd3..01afa66fed5bfd6f3a87e6360d16bea77e035d79 100644
--- a/src/codec/SkSwizzler.cpp
+++ b/src/codec/SkSwizzler.cpp
@@ -72,10 +72,17 @@ static SkSwizzler::ResultAlpha swizzle_small_index_to_n32(
static SkSwizzler::ResultAlpha swizzle_index_to_index(
void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int width,
- int bytesPerPixel, int y, const SkPMColor ctable[]) {
+ int deltaSrc, int y, const SkPMColor ctable[]) {
uint8_t* SK_RESTRICT dst = (uint8_t*) dstRow;
- memcpy(dst, src, width);
+ if (1 == deltaSrc) {
+ memcpy(dst, src, width);
+ } else {
+ for (int x = 0; x < width; x++) {
+ dst[x] = src[0];
+ src += deltaSrc;
+ }
+ }
// TODO (msarett): Should we skip the loop here and guess that the row is opaque/not opaque?
// SkScaledBitmap sampler just guesses that it is opaque. This is dangerous
// and probably wrong since gif and bmp (rarely) may have alpha.
@@ -88,30 +95,32 @@ static SkSwizzler::ResultAlpha swizzle_index_to_index(
static SkSwizzler::ResultAlpha swizzle_index_to_n32(
void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int width,
- int bytesPerPixel, int y, const SkPMColor ctable[]) {
+ int deltaSrc, int y, const SkPMColor ctable[]) {
SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
INIT_RESULT_ALPHA;
for (int x = 0; x < width; x++) {
- SkPMColor c = ctable[src[x]];
+ SkPMColor c = ctable[*src];
UPDATE_RESULT_ALPHA(c >> SK_A32_SHIFT);
dst[x] = c;
+ src += deltaSrc;
}
return COMPUTE_RESULT_ALPHA;
}
static SkSwizzler::ResultAlpha swizzle_index_to_n32_skipZ(
void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int width,
- int bytesPerPixel, int y, const SkPMColor ctable[]) {
+ int deltaSrc, int y, const SkPMColor ctable[]) {
SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
INIT_RESULT_ALPHA;
for (int x = 0; x < width; x++) {
- SkPMColor c = ctable[src[x]];
+ SkPMColor c = ctable[*src];
UPDATE_RESULT_ALPHA(c >> SK_A32_SHIFT);
if (c != 0) {
dst[x] = c;
}
+ src += deltaSrc;
}
return COMPUTE_RESULT_ALPHA;
}
@@ -122,19 +131,29 @@ static SkSwizzler::ResultAlpha swizzle_index_to_n32_skipZ(
static SkSwizzler::ResultAlpha swizzle_gray_to_n32(
void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int width,
- int bytesPerPixel, int y, const SkPMColor ctable[]) {
+ int deltaSrc, int y, const SkPMColor ctable[]) {
SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
for (int x = 0; x < width; x++) {
- dst[x] = SkPackARGB32NoCheck(0xFF, src[x], src[x], src[x]);
+ dst[x] = SkPackARGB32NoCheck(0xFF, *src, *src, *src);
+ src += deltaSrc;
}
return SkSwizzler::kOpaque_ResultAlpha;
}
static SkSwizzler::ResultAlpha swizzle_gray_to_gray(
void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int width,
- int bytesPerPixel, int y, const SkPMColor ctable[]) {
- memcpy(dstRow, src, width);
+ int deltaSrc, int y, const SkPMColor ctable[]) {
+
+ uint8_t* SK_RESTRICT dst = (uint8_t*) dstRow;
+ if (1 == deltaSrc) {
+ memcpy(dstRow, src, width);
+ } else {
+ for (int x = 0; x < width; x++) {
+ dst[x] = src[0];
+ src += deltaSrc;
+ }
+ }
return SkSwizzler::kOpaque_ResultAlpha;
}
@@ -142,12 +161,12 @@ static SkSwizzler::ResultAlpha swizzle_gray_to_gray(
static SkSwizzler::ResultAlpha swizzle_bgrx_to_n32(
void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int width,
- int bytesPerPixel, int y, const SkPMColor ctable[]) {
+ int deltaSrc, int y, const SkPMColor ctable[]) {
SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
for (int x = 0; x < width; x++) {
dst[x] = SkPackARGB32NoCheck(0xFF, src[2], src[1], src[0]);
- src += bytesPerPixel;
+ src += deltaSrc;
}
return SkSwizzler::kOpaque_ResultAlpha;
}
@@ -156,7 +175,7 @@ static SkSwizzler::ResultAlpha swizzle_bgrx_to_n32(
static SkSwizzler::ResultAlpha swizzle_bgra_to_n32_unpremul(
void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int width,
- int bytesPerPixel, int y, const SkPMColor ctable[]) {
+ int deltaSrc, int y, const SkPMColor ctable[]) {
SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
INIT_RESULT_ALPHA;
@@ -164,14 +183,14 @@ static SkSwizzler::ResultAlpha swizzle_bgra_to_n32_unpremul(
uint8_t alpha = src[3];
UPDATE_RESULT_ALPHA(alpha);
dst[x] = SkPackARGB32NoCheck(alpha, src[2], src[1], src[0]);
- src += bytesPerPixel;
+ src += deltaSrc;
}
return COMPUTE_RESULT_ALPHA;
}
static SkSwizzler::ResultAlpha swizzle_bgra_to_n32_premul(
void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int width,
- int bytesPerPixel, int y, const SkPMColor ctable[]) {
+ int deltaSrc, int y, const SkPMColor ctable[]) {
SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
INIT_RESULT_ALPHA;
@@ -179,7 +198,7 @@ static SkSwizzler::ResultAlpha swizzle_bgra_to_n32_premul(
uint8_t alpha = src[3];
UPDATE_RESULT_ALPHA(alpha);
dst[x] = SkPreMultiplyARGB(alpha, src[2], src[1], src[0]);
- src += bytesPerPixel;
+ src += deltaSrc;
}
return COMPUTE_RESULT_ALPHA;
}
@@ -187,19 +206,19 @@ static SkSwizzler::ResultAlpha swizzle_bgra_to_n32_premul(
// n32
static SkSwizzler::ResultAlpha swizzle_rgbx_to_n32(
void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int width,
- int bytesPerPixel, int y, const SkPMColor ctable[]) {
+ int deltaSrc, int y, const SkPMColor ctable[]) {
SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
for (int x = 0; x < width; x++) {
dst[x] = SkPackARGB32(0xFF, src[0], src[1], src[2]);
- src += bytesPerPixel;
+ src += deltaSrc;
}
return SkSwizzler::kOpaque_ResultAlpha;
}
static SkSwizzler::ResultAlpha swizzle_rgba_to_n32_premul(
void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int width,
- int bytesPerPixel, int y, const SkPMColor ctable[]) {
+ int deltaSrc, int y, const SkPMColor ctable[]) {
SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
INIT_RESULT_ALPHA;
@@ -207,14 +226,14 @@ static SkSwizzler::ResultAlpha swizzle_rgba_to_n32_premul(
unsigned alpha = src[3];
UPDATE_RESULT_ALPHA(alpha);
dst[x] = SkPreMultiplyARGB(alpha, src[0], src[1], src[2]);
- src += bytesPerPixel;
+ src += deltaSrc;
}
return COMPUTE_RESULT_ALPHA;
}
static SkSwizzler::ResultAlpha swizzle_rgba_to_n32_unpremul(
void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int width,
- int bytesPerPixel, int y, const SkPMColor ctable[]) {
+ int deltaSrc, int y, const SkPMColor ctable[]) {
uint32_t* SK_RESTRICT dst = reinterpret_cast<uint32_t*>(dstRow);
INIT_RESULT_ALPHA;
@@ -222,14 +241,14 @@ static SkSwizzler::ResultAlpha swizzle_rgba_to_n32_unpremul(
unsigned alpha = src[3];
UPDATE_RESULT_ALPHA(alpha);
dst[x] = SkPackARGB32NoCheck(alpha, src[0], src[1], src[2]);
- src += bytesPerPixel;
+ src += deltaSrc;
}
return COMPUTE_RESULT_ALPHA;
}
static SkSwizzler::ResultAlpha swizzle_rgba_to_n32_premul_skipZ(
void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int width,
- int bytesPerPixel, int y, const SkPMColor ctable[]) {
+ int deltaSrc, int y, const SkPMColor ctable[]) {
SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
INIT_RESULT_ALPHA;
@@ -239,7 +258,7 @@ static SkSwizzler::ResultAlpha swizzle_rgba_to_n32_premul_skipZ(
if (0 != alpha) {
dst[x] = SkPreMultiplyARGB(alpha, src[0], src[1], src[2]);
}
- src += bytesPerPixel;
+ src += deltaSrc;
}
return COMPUTE_RESULT_ALPHA;
}
@@ -421,10 +440,25 @@ SkSwizzler::SkSwizzler(RowProc proc, const SkPMColor* ctable,
, fDstRow(dst)
, fDstRowBytes(rowBytes)
, fCurrY(0)
+ , fSampleX(1)
+ , fX0(0)
{
SkDEBUGCODE(fNextMode = kUninitialized_NextMode);
}
+void SkSwizzler::setSampleX(int sampleX){
+ if (1 == sampleX) {
+ fX0 = 0;
+ fSampleX = 1;
+ } else {
+ fSampleX = sampleX;
+ // offset first x pixel for more even sampling
+ fX0 = fSampleX >> 1;
+ }
+ // check that fX0 is less than original width
+ SkASSERT(fX0 >= 0 && fX0 < fDstInfo.width() * fSampleX);
+}
+
SkSwizzler::ResultAlpha SkSwizzler::next(const uint8_t* SK_RESTRICT src) {
SkASSERT(0 <= fCurrY && fCurrY < fDstInfo.height());
SkASSERT(fDstRow != NULL);
@@ -432,8 +466,8 @@ SkSwizzler::ResultAlpha SkSwizzler::next(const uint8_t* SK_RESTRICT src) {
SkDEBUGCODE(fNextMode = kConsecutive_NextMode);
// Decode a row
- const ResultAlpha result = fRowProc(fDstRow, src, fDstInfo.width(),
- fDeltaSrc, fCurrY, fColorTable);
+ const ResultAlpha result = fRowProc(fDstRow, src + fX0 * fDeltaSrc, fDstInfo.width(),
+ fSampleX * fDeltaSrc, fCurrY, fColorTable);
// Move to the next row and return the result
fCurrY++;
@@ -451,7 +485,7 @@ SkSwizzler::ResultAlpha SkSwizzler::next(const uint8_t* SK_RESTRICT src,
void* row = SkTAddOffset<void>(fDstRow, y*fDstRowBytes);
// Decode the row
- return fRowProc(row, src, fDstInfo.width(), fDeltaSrc, fCurrY,
+ return fRowProc(row, src + fX0 * fDeltaSrc, fDstInfo.width(), fSampleX * fDeltaSrc, fCurrY,
fColorTable);
}
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