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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: Update wbmp swizzling functions again Created 5 years, 4 months ago
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Index: src/codec/SkSwizzler.cpp
diff --git a/src/codec/SkSwizzler.cpp b/src/codec/SkSwizzler.cpp
index b2b7f927ac262913d86fcfd6c89af7cf430723cb..74c06fb3e67f963a3eee384cd79c0aeb724a3a95 100644
--- a/src/codec/SkSwizzler.cpp
+++ b/src/codec/SkSwizzler.cpp
@@ -7,6 +7,7 @@
#include "SkCodecPriv.h"
#include "SkColorPriv.h"
+#include "SkScaledCodec.h"
#include "SkSwizzler.h"
#include "SkTemplates.h"
#include "SkUtils.h"
@@ -19,36 +20,55 @@ SkSwizzler::ResultAlpha SkSwizzler::GetResult(uint8_t zeroAlpha,
return (((uint16_t) maxAlpha) << 8) | zeroAlpha;
}
+// samples the row. Does not do anything else but sampling
+static SkSwizzler::ResultAlpha sample565(void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src,
+ int width, int deltaSrc, int offset, const SkPMColor ctable[]){
+
+ src += offset;
+ uint16_t* SK_RESTRICT dst = (uint16_t*) dstRow;
+ for (int x = 0; x < width; x++) {
+ dst[x] = src[1] << 8 | src[0];
+ src += deltaSrc;
+ }
+ // 565 is always opaque
+ return SkSwizzler::kOpaque_ResultAlpha;
+}
+
// kBit
// These routines exclusively choose between white and black
#define GRAYSCALE_BLACK 0
#define GRAYSCALE_WHITE 0xFF
+
+// same as swizzle_bit_to_index and swizzle_bit_to_n32 except for value assigned to dst[x]
static SkSwizzler::ResultAlpha swizzle_bit_to_grayscale(
- void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int width,
- int /*bitsPerPixel*/, const SkPMColor* /*ctable*/) {
+ void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
+ int deltaSrc, int offset, const SkPMColor* /*ctable*/) {
+
uint8_t* SK_RESTRICT dst = (uint8_t*) dstRow;
- // Determine how many full bytes are in the row
- int bytesInRow = width >> 3;
- int i;
- for (i = 0; i < bytesInRow; i++) {
- U8CPU currByte = src[i];
- for (int j = 0; j < 8; j++) {
- dst[j] = ((currByte >> (7 - j)) & 1) ? GRAYSCALE_WHITE : GRAYSCALE_BLACK;
- }
- dst += 8;
- }
+ // increment src by byte offset and bitIndex by bit offset
+ src += offset >> 3;
+ int bitIndex = offset & 7;
+
+ uint8_t currByte = src[0];
+ int sample = deltaSrc;
- // Finish the remaining bits
- width &= 7;
- if (width > 0) {
- U8CPU currByte = src[i];
- for (int j = 0; j < width; j++) {
- dst[j] = ((currByte >> 7) & 1) ? GRAYSCALE_WHITE : GRAYSCALE_BLACK;
- currByte <<= 1;
+ int x = 0;
+ while (x < dstWidth) {
+ if (8 == bitIndex) {
+ src++;
+ currByte = *src;
msarett 2015/08/12 14:37:41 FWIW, I prefer: currByte = *(++src); But I'm late
emmaleer 2015/08/12 15:08:44 Acknowledged.
+ bitIndex = 0;
+ }
+ if (deltaSrc == sample) {
+ dst[x] = ((currByte >> (7-bitIndex)) & 1) ? GRAYSCALE_WHITE : GRAYSCALE_BLACK;
+ sample = 0;
+ x++;
}
+ sample++;
+ bitIndex++;
}
return SkSwizzler::kOpaque_ResultAlpha;
}
@@ -56,58 +76,64 @@ static SkSwizzler::ResultAlpha swizzle_bit_to_grayscale(
#undef GRAYSCALE_BLACK
#undef GRAYSCALE_WHITE
+// same as swizzle_bit_to_grayscale and swizzle_bit_to_n32 except for value assigned to dst[x]
static SkSwizzler::ResultAlpha swizzle_bit_to_index(
- void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int width,
- int /*bitsPerPixel*/, const SkPMColor* /*ctable*/) {
+ void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
+ int deltaSrc, int offset, const SkPMColor* /*ctable*/) {
uint8_t* SK_RESTRICT dst = (uint8_t*) dstRow;
- // Determine how many full bytes are in the row
- int bytesInRow = width >> 3;
- int i;
- for (i = 0; i < bytesInRow; i++) {
- U8CPU currByte = src[i];
- for (int j = 0; j < 8; j++) {
- dst[j] = (currByte >> (7 - j)) & 1;
- }
- dst += 8;
- }
+ // increment src by byte offset and bitIndex by bit offset
+ src += offset >> 3;
+ int bitIndex = offset & 7;
- // Finish the remaining bits
- width &= 7;
- if (width > 0) {
- U8CPU currByte = src[i];
- for (int j = 0; j < width; j++) {
- dst[j] = ((currByte >> 7) & 1);
- currByte <<= 1;
+
+ uint8_t currByte = src[0];
+ int sample = deltaSrc;
+ int x = 0;
+ while (x < dstWidth) {
+ if (8 == bitIndex) {
+ src++;
+ currByte = *src;
+ bitIndex = 0;
}
+ if (deltaSrc == sample) {
+ dst[x] = ((currByte >> (7-bitIndex)) & 1);
+ sample = 0;
+ x++;
+ }
+ sample++;
+ bitIndex++;
}
return SkSwizzler::kOpaque_ResultAlpha;
}
+// same as swizzle_bit_to_grayscale and swizzle_bit_to_index except for value assigned to dst[x]
static SkSwizzler::ResultAlpha swizzle_bit_to_n32(
- void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int width,
- int /*bitsPerPixel*/, const SkPMColor* /*ctable*/) {
+ void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
+ int deltaSrc, int offset, const SkPMColor* /*ctable*/) {
SkPMColor* SK_RESTRICT dst = (SkPMColor*) dstRow;
- // Determine how many full bytes are in the row
- int bytesInRow = width >> 3;
- int i;
- for (i = 0; i < bytesInRow; i++) {
- U8CPU currByte = src[i];
- for (int j = 0; j < 8; j++) {
- dst[j] = ((currByte >> (7 - j)) & 1) ? SK_ColorWHITE : SK_ColorBLACK;
- }
- dst += 8;
- }
+ // increment src by byte offset and bitIndex by bit offset
+ src += offset >> 3;
+ int bitIndex = offset & 7;
+
+ uint8_t currByte = src[0];
+ int sample = deltaSrc;
- // Finish the remaining bits
- width &= 7;
- if (width > 0) {
- U8CPU currByte = src[i];
- for (int j = 0; j < width; j++) {
- dst[j] = ((currByte >> 7) & 1) ? SK_ColorWHITE : SK_ColorBLACK;
- currByte <<= 1;
+ int x = 0;
+ while (x < dstWidth) {
+ if (8 == bitIndex) {
+ src++;
+ currByte = *src;
+ bitIndex = 0;
+ }
+ if (deltaSrc == sample) {
+ dst[x] = ((currByte >> (7 - bitIndex)) & 1) ? SK_ColorWHITE : SK_ColorBLACK;
+ sample = 0;
+ x++;
}
+ sample++;
+ bitIndex++;
}
return SkSwizzler::kOpaque_ResultAlpha;
}
@@ -115,18 +141,19 @@ static SkSwizzler::ResultAlpha swizzle_bit_to_n32(
// kIndex1, kIndex2, kIndex4
static SkSwizzler::ResultAlpha swizzle_small_index_to_index(
- void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int width,
- int bitsPerPixel, const SkPMColor ctable[]) {
+ void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
+ int bitsPerPixel, int offset, const SkPMColor ctable[]) {
+ src += offset;
uint8_t* SK_RESTRICT dst = (uint8_t*) dstRow;
INIT_RESULT_ALPHA;
const uint32_t pixelsPerByte = 8 / bitsPerPixel;
- const size_t rowBytes = compute_row_bytes_ppb(width, pixelsPerByte);
+ const size_t rowBytes = compute_row_bytes_ppb(dstWidth, pixelsPerByte);
const uint8_t mask = (1 << bitsPerPixel) - 1;
int x = 0;
for (uint32_t byte = 0; byte < rowBytes; byte++) {
uint8_t pixelData = src[byte];
- for (uint32_t p = 0; p < pixelsPerByte && x < width; p++) {
+ for (uint32_t p = 0; p < pixelsPerByte && x < dstWidth; p++) {
uint8_t index = (pixelData >> (8 - bitsPerPixel)) & mask;
UPDATE_RESULT_ALPHA(ctable[index] >> SK_A32_SHIFT);
dst[x] = index;
@@ -138,18 +165,19 @@ static SkSwizzler::ResultAlpha swizzle_small_index_to_index(
}
static SkSwizzler::ResultAlpha swizzle_small_index_to_n32(
- void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int width,
- int bitsPerPixel, const SkPMColor ctable[]) {
+ void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
+ int bitsPerPixel, int offset, const SkPMColor ctable[]) {
+ src += offset;
SkPMColor* SK_RESTRICT dst = (SkPMColor*) dstRow;
INIT_RESULT_ALPHA;
const uint32_t pixelsPerByte = 8 / bitsPerPixel;
- const size_t rowBytes = compute_row_bytes_ppb(width, pixelsPerByte);
+ const size_t rowBytes = compute_row_bytes_ppb(dstWidth, pixelsPerByte);
const uint8_t mask = (1 << bitsPerPixel) - 1;
int x = 0;
for (uint32_t byte = 0; byte < rowBytes; byte++) {
uint8_t pixelData = src[byte];
- for (uint32_t p = 0; p < pixelsPerByte && x < width; p++) {
+ for (uint32_t p = 0; p < pixelsPerByte && x < dstWidth; p++) {
uint8_t index = (pixelData >> (8 - bitsPerPixel)) & mask;
SkPMColor c = ctable[index];
UPDATE_RESULT_ALPHA(c >> SK_A32_SHIFT);
@@ -164,58 +192,71 @@ static SkSwizzler::ResultAlpha swizzle_small_index_to_n32(
// kIndex
static SkSwizzler::ResultAlpha swizzle_index_to_index(
- void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int width,
- int bytesPerPixel, const SkPMColor ctable[]) {
+ void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
+ int deltaSrc, int offset, const SkPMColor ctable[]) {
+ src += offset;
uint8_t* SK_RESTRICT dst = (uint8_t*) dstRow;
- memcpy(dst, src, width);
+ if (1 == deltaSrc) {
+ memcpy(dst, src, dstWidth);
+ } else {
+ for (int x = 0; x < dstWidth; 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.
INIT_RESULT_ALPHA;
- for (int x = 0; x < width; x++) {
+ for (int x = 0; x < dstWidth; x++) {
UPDATE_RESULT_ALPHA(ctable[src[x]] >> SK_A32_SHIFT);
}
return COMPUTE_RESULT_ALPHA;
}
static SkSwizzler::ResultAlpha swizzle_index_to_n32(
- void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int width,
- int bytesPerPixel, const SkPMColor ctable[]) {
+ void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
+ int deltaSrc, int offset, const SkPMColor ctable[]) {
+ src += offset;
SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
INIT_RESULT_ALPHA;
- for (int x = 0; x < width; x++) {
- SkPMColor c = ctable[src[x]];
+ for (int x = 0; x < dstWidth; 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, const SkPMColor ctable[]) {
+ void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
+ int deltaSrc, int offset, const SkPMColor ctable[]) {
+ src += offset;
SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
INIT_RESULT_ALPHA;
- for (int x = 0; x < width; x++) {
- SkPMColor c = ctable[src[x]];
+ for (int x = 0; x < dstWidth; x++) {
+ SkPMColor c = ctable[*src];
UPDATE_RESULT_ALPHA(c >> SK_A32_SHIFT);
if (c != 0) {
dst[x] = c;
}
+ src += deltaSrc;
}
return COMPUTE_RESULT_ALPHA;
}
static SkSwizzler::ResultAlpha swizzle_index_to_565(
- void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int width,
- int bytesPerPixel, const SkPMColor ctable[]) {
+ void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
+ int bytesPerPixel, int offset, const SkPMColor ctable[]) {
// FIXME: Support dithering? Requires knowing y, which I think is a bigger
// change.
+ src += offset;
uint16_t* SK_RESTRICT dst = (uint16_t*)dstRow;
- for (int x = 0; x < width; x++) {
+ for (int x = 0; x < dstWidth; x++) {
dst[x] = SkPixel32ToPixel16(ctable[*src]);
src += bytesPerPixel;
}
@@ -228,29 +269,42 @@ static SkSwizzler::ResultAlpha swizzle_index_to_565(
// kGray
static SkSwizzler::ResultAlpha swizzle_gray_to_n32(
- void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int width,
- int bytesPerPixel, const SkPMColor ctable[]) {
+ void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
+ int deltaSrc, int offset, const SkPMColor ctable[]) {
+ src += offset;
SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
- for (int x = 0; x < width; x++) {
- dst[x] = SkPackARGB32NoCheck(0xFF, src[x], src[x], src[x]);
+ for (int x = 0; x < dstWidth; 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, const SkPMColor ctable[]) {
- memcpy(dstRow, src, width);
+ void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
+ int deltaSrc, int offset, const SkPMColor ctable[]) {
+
+ src += offset;
+ uint8_t* SK_RESTRICT dst = (uint8_t*) dstRow;
+ if (1 == deltaSrc) {
+ memcpy(dstRow, src, dstWidth);
+ } else {
+ for (int x = 0; x < dstWidth; x++) {
+ dst[x] = src[0];
+ src += deltaSrc;
+ }
+ }
return SkSwizzler::kOpaque_ResultAlpha;
}
static SkSwizzler::ResultAlpha swizzle_gray_to_565(
- void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int width,
- int bytesPerPixel, const SkPMColor ctable[]) {
+ void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
+ int bytesPerPixel, int offset, const SkPMColor ctable[]) {
// FIXME: Support dithering?
+ src += offset;
uint16_t* SK_RESTRICT dst = (uint16_t*)dstRow;
- for (int x = 0; x < width; x++) {
+ for (int x = 0; x < dstWidth; x++) {
dst[x] = SkPack888ToRGB16(src[0], src[0], src[0]);
src += bytesPerPixel;
}
@@ -260,13 +314,14 @@ static SkSwizzler::ResultAlpha swizzle_gray_to_565(
// kBGRX
static SkSwizzler::ResultAlpha swizzle_bgrx_to_n32(
- void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int width,
- int bytesPerPixel, const SkPMColor ctable[]) {
+ void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
+ int deltaSrc, int offset, const SkPMColor ctable[]) {
+ src += offset;
SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
- for (int x = 0; x < width; x++) {
+ for (int x = 0; x < dstWidth; x++) {
dst[x] = SkPackARGB32NoCheck(0xFF, src[2], src[1], src[0]);
- src += bytesPerPixel;
+ src += deltaSrc;
}
return SkSwizzler::kOpaque_ResultAlpha;
}
@@ -274,54 +329,58 @@ static SkSwizzler::ResultAlpha swizzle_bgrx_to_n32(
// kBGRA
static SkSwizzler::ResultAlpha swizzle_bgra_to_n32_unpremul(
- void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int width,
- int bytesPerPixel, const SkPMColor ctable[]) {
+ void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
+ int deltaSrc, int offset, const SkPMColor ctable[]) {
+ src += offset;
SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
INIT_RESULT_ALPHA;
- for (int x = 0; x < width; x++) {
+ for (int x = 0; x < dstWidth; x++) {
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, const SkPMColor ctable[]) {
+ void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
+ int deltaSrc, int offset, const SkPMColor ctable[]) {
+ src += offset;
SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
INIT_RESULT_ALPHA;
- for (int x = 0; x < width; x++) {
+ for (int x = 0; x < dstWidth; x++) {
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;
}
// kRGBX
static SkSwizzler::ResultAlpha swizzle_rgbx_to_n32(
- void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int width,
- int bytesPerPixel, const SkPMColor ctable[]) {
+ void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
+ int deltaSrc, int offset, const SkPMColor ctable[]) {
+ src += offset;
SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
- for (int x = 0; x < width; x++) {
+ for (int x = 0; x < dstWidth; x++) {
dst[x] = SkPackARGB32(0xFF, src[0], src[1], src[2]);
- src += bytesPerPixel;
+ src += deltaSrc;
}
return SkSwizzler::kOpaque_ResultAlpha;
}
static SkSwizzler::ResultAlpha swizzle_rgbx_to_565(
- void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int width,
- int bytesPerPixel, const SkPMColor ctable[]) {
+ void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
+ int bytesPerPixel, int offset, const SkPMColor ctable[]) {
// FIXME: Support dithering?
+ src += offset;
uint16_t* SK_RESTRICT dst = (uint16_t*)dstRow;
- for (int x = 0; x < width; x++) {
+ for (int x = 0; x < dstWidth; x++) {
dst[x] = SkPack888ToRGB16(src[0], src[1], src[2]);
src += bytesPerPixel;
}
@@ -331,48 +390,51 @@ static SkSwizzler::ResultAlpha swizzle_rgbx_to_565(
// kRGBA
static SkSwizzler::ResultAlpha swizzle_rgba_to_n32_premul(
- void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int width,
- int bytesPerPixel, const SkPMColor ctable[]) {
+ void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
+ int deltaSrc, int offset, const SkPMColor ctable[]) {
+ src += offset;
SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
INIT_RESULT_ALPHA;
- for (int x = 0; x < width; x++) {
+ for (int x = 0; x < dstWidth; x++) {
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, const SkPMColor ctable[]) {
+ void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
+ int deltaSrc, int offset, const SkPMColor ctable[]) {
+ src += offset;
uint32_t* SK_RESTRICT dst = reinterpret_cast<uint32_t*>(dstRow);
INIT_RESULT_ALPHA;
- for (int x = 0; x < width; x++) {
+ for (int x = 0; x < dstWidth; x++) {
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, const SkPMColor ctable[]) {
+ void* SK_RESTRICT dstRow, const uint8_t* SK_RESTRICT src, int dstWidth,
+ int deltaSrc, int offset, const SkPMColor ctable[]) {
+ src += offset;
SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
INIT_RESULT_ALPHA;
- for (int x = 0; x < width; x++) {
+ for (int x = 0; x < dstWidth; x++) {
unsigned alpha = src[3];
UPDATE_RESULT_ALPHA(alpha);
if (0 != alpha) {
dst[x] = SkPreMultiplyARGB(alpha, src[0], src[1], src[2]);
}
- src += bytesPerPixel;
+ src += deltaSrc;
}
return COMPUTE_RESULT_ALPHA;
}
@@ -385,11 +447,12 @@ static SkSwizzler::ResultAlpha swizzle_rgba_to_n32_premul_skipZ(
decide whether to switch to unpremul default.
static bool swizzle_rgba_to_n32_unpremul_skipZ(void* SK_RESTRICT dstRow,
const uint8_t* SK_RESTRICT src,
- int width, int bitsPerPixel,
+ int dstWidth, int bitsPerPixel, int offset,
const SkPMColor[]) {
+ src += offset;
SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
unsigned alphaMask = 0xFF;
- for (int x = 0; x < width; x++) {
+ for (int x = 0; x < dstWidth; x++) {
unsigned alpha = src[3];
// NOTE: We cheat here. The caller requested unpremul and skip zeroes. It's possible
// the color components are not zero, but we skip them anyway, meaning they'll remain
@@ -406,9 +469,10 @@ static bool swizzle_rgba_to_n32_unpremul_skipZ(void* SK_RESTRICT dstRow,
SkSwizzler* SkSwizzler::CreateSwizzler(SkSwizzler::SrcConfig sc,
const SkPMColor* ctable,
- const SkImageInfo& info,
- SkCodec::ZeroInitialized zeroInit) {
- if (info.colorType() == kUnknown_SkColorType || kUnknown == sc) {
+ const SkImageInfo& dstInfo,
+ SkCodec::ZeroInitialized zeroInit,
+ int srcWidth) {
+ if (dstInfo.colorType() == kUnknown_SkColorType || kUnknown == sc) {
return NULL;
}
if ((kIndex == sc || kIndex4 == sc || kIndex2 == sc || kIndex1 == sc)
@@ -416,9 +480,10 @@ SkSwizzler* SkSwizzler::CreateSwizzler(SkSwizzler::SrcConfig sc,
return NULL;
}
RowProc proc = NULL;
+
switch (sc) {
case kBit:
- switch (info.colorType()) {
+ switch (dstInfo.colorType()) {
case kN32_SkColorType:
proc = &swizzle_bit_to_n32;
break;
@@ -435,7 +500,7 @@ SkSwizzler* SkSwizzler::CreateSwizzler(SkSwizzler::SrcConfig sc,
case kIndex1:
case kIndex2:
case kIndex4:
- switch (info.colorType()) {
+ switch (dstInfo.colorType()) {
case kN32_SkColorType:
proc = &swizzle_small_index_to_n32;
break;
@@ -447,7 +512,7 @@ SkSwizzler* SkSwizzler::CreateSwizzler(SkSwizzler::SrcConfig sc,
}
break;
case kIndex:
- switch (info.colorType()) {
+ switch (dstInfo.colorType()) {
case kN32_SkColorType:
// We assume the color premultiplied ctable (or not) as desired.
if (SkCodec::kYes_ZeroInitialized == zeroInit) {
@@ -469,7 +534,7 @@ SkSwizzler* SkSwizzler::CreateSwizzler(SkSwizzler::SrcConfig sc,
}
break;
case kGray:
- switch (info.colorType()) {
+ switch (dstInfo.colorType()) {
case kN32_SkColorType:
proc = &swizzle_gray_to_n32;
break;
@@ -485,7 +550,7 @@ SkSwizzler* SkSwizzler::CreateSwizzler(SkSwizzler::SrcConfig sc,
break;
case kBGR:
case kBGRX:
- switch (info.colorType()) {
+ switch (dstInfo.colorType()) {
case kN32_SkColorType:
proc = &swizzle_bgrx_to_n32;
break;
@@ -494,9 +559,9 @@ SkSwizzler* SkSwizzler::CreateSwizzler(SkSwizzler::SrcConfig sc,
}
break;
case kBGRA:
- switch (info.colorType()) {
+ switch (dstInfo.colorType()) {
case kN32_SkColorType:
- switch (info.alphaType()) {
+ switch (dstInfo.alphaType()) {
case kUnpremul_SkAlphaType:
proc = &swizzle_bgra_to_n32_unpremul;
break;
@@ -513,7 +578,7 @@ SkSwizzler* SkSwizzler::CreateSwizzler(SkSwizzler::SrcConfig sc,
break;
case kRGBX:
// TODO: Support other swizzles.
- switch (info.colorType()) {
+ switch (dstInfo.colorType()) {
case kN32_SkColorType:
proc = &swizzle_rgbx_to_n32;
break;
@@ -524,9 +589,9 @@ SkSwizzler* SkSwizzler::CreateSwizzler(SkSwizzler::SrcConfig sc,
}
break;
case kRGBA:
- switch (info.colorType()) {
+ switch (dstInfo.colorType()) {
case kN32_SkColorType:
- if (info.alphaType() == kUnpremul_SkAlphaType) {
+ if (dstInfo.alphaType() == kUnpremul_SkAlphaType) {
// Respect zeroInit?
proc = &swizzle_rgba_to_n32_unpremul;
} else {
@@ -542,7 +607,7 @@ SkSwizzler* SkSwizzler::CreateSwizzler(SkSwizzler::SrcConfig sc,
}
break;
case kRGB:
- switch (info.colorType()) {
+ switch (dstInfo.colorType()) {
case kN32_SkColorType:
proc = &swizzle_rgbx_to_n32;
break;
@@ -550,6 +615,14 @@ SkSwizzler* SkSwizzler::CreateSwizzler(SkSwizzler::SrcConfig sc,
break;
}
break;
+ case kRGB_565:
+ switch (dstInfo.colorType()) {
+ case kRGB_565_SkColorType:
+ proc = &sample565;
+ break;
+ default:
+ break;
+ }
default:
break;
}
@@ -558,22 +631,29 @@ SkSwizzler* SkSwizzler::CreateSwizzler(SkSwizzler::SrcConfig sc,
}
// Store deltaSrc in bytes if it is an even multiple, otherwise use bits
- int deltaSrc = SkIsAlign8(BitsPerPixel(sc)) ? BytesPerPixel(sc) :
- BitsPerPixel(sc);
- return SkNEW_ARGS(SkSwizzler, (proc, ctable, deltaSrc, info));
+ int deltaSrc = SkIsAlign8(BitsPerPixel(sc)) ? BytesPerPixel(sc) : BitsPerPixel(sc);
+
+ int sampleX = SkScaledCodec::GetSampleSize(srcWidth, dstInfo.width());
+
+ return SkNEW_ARGS(SkSwizzler, (proc, ctable, deltaSrc, dstInfo, sampleX));
}
SkSwizzler::SkSwizzler(RowProc proc, const SkPMColor* ctable,
- int deltaSrc, const SkImageInfo& info)
+ int deltaSrc, const SkImageInfo& info, int sampleX)
: fRowProc(proc)
, fColorTable(ctable)
, fDeltaSrc(deltaSrc)
, fDstInfo(info)
-{}
+ , fSampleX(sampleX)
+ , fX0(sampleX == 1 ? 0 : sampleX >> 1)
+{
+ // check that fX0 is less than original width
+ SkASSERT(fX0 >= 0 && fX0 < fDstInfo.width() * fSampleX);
+}
SkSwizzler::ResultAlpha SkSwizzler::swizzle(void* dst, const uint8_t* SK_RESTRICT src) {
SkASSERT(NULL != dst && NULL != src);
- return fRowProc(dst, src, fDstInfo.width(), fDeltaSrc, fColorTable);
+ return fRowProc(dst, src, fDstInfo.width(), fSampleX * fDeltaSrc, fX0 * fDeltaSrc, fColorTable);
}
void SkSwizzler::Fill(void* dstStartRow, const SkImageInfo& dstInfo, size_t dstRowBytes,
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