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Unified Diff: src/images/SkScaledBitmapSampler.cpp

Issue 1820503002: Delete SkImageDecoder (Closed) Base URL: https://skia.googlesource.com/skia.git@fix-animator
Patch Set: Include SkImage Created 4 years, 9 months ago
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Index: src/images/SkScaledBitmapSampler.cpp
diff --git a/src/images/SkScaledBitmapSampler.cpp b/src/images/SkScaledBitmapSampler.cpp
deleted file mode 100644
index 5ffd64889396b57ac8b5bf893f7f106212be00f1..0000000000000000000000000000000000000000
--- a/src/images/SkScaledBitmapSampler.cpp
+++ /dev/null
@@ -1,877 +0,0 @@
-/*
- * Copyright 2007 The Android Open Source Project
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-
-#include "SkScaledBitmapSampler.h"
-#include "SkBitmap.h"
-#include "SkColorPriv.h"
-#include "SkDither.h"
-#include "SkTypes.h"
-
-// 8888
-
-static bool Sample_Gray_D8888(void* SK_RESTRICT dstRow,
- const uint8_t* SK_RESTRICT src,
- int width, int deltaSrc, int, const SkPMColor[]) {
- SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
- for (int x = 0; x < width; x++) {
- dst[x] = SkPackARGB32(0xFF, src[0], src[0], src[0]);
- src += deltaSrc;
- }
- return false;
-}
-
-static SkScaledBitmapSampler::RowProc
-get_gray_to_8888_proc(const SkScaledBitmapSampler::Options& opts) {
- // Dither, unpremul, and skipZeroes have no effect
- return Sample_Gray_D8888;
-}
-
-static bool Sample_RGBx_D8888(void* SK_RESTRICT dstRow,
- const uint8_t* SK_RESTRICT src,
- int width, int deltaSrc, int, const SkPMColor[]) {
- SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
- for (int x = 0; x < width; x++) {
- dst[x] = SkPackARGB32(0xFF, src[0], src[1], src[2]);
- src += deltaSrc;
- }
- return false;
-}
-
-static SkScaledBitmapSampler::RowProc
-get_RGBx_to_8888_proc(const SkScaledBitmapSampler::Options& opts) {
- // Dither, unpremul, and skipZeroes have no effect
- return Sample_RGBx_D8888;
-}
-
-static bool Sample_RGBA_D8888(void* SK_RESTRICT dstRow,
- const uint8_t* SK_RESTRICT src,
- int width, int deltaSrc, int, const SkPMColor[]) {
- SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
- unsigned alphaMask = 0xFF;
- for (int x = 0; x < width; x++) {
- unsigned alpha = src[3];
- dst[x] = SkPreMultiplyARGB(alpha, src[0], src[1], src[2]);
- src += deltaSrc;
- alphaMask &= alpha;
- }
- return alphaMask != 0xFF;
-}
-
-static bool Sample_RGBA_D8888_Unpremul(void* SK_RESTRICT dstRow,
- const uint8_t* SK_RESTRICT src,
- int width, int deltaSrc, int,
- const SkPMColor[]) {
- uint32_t* SK_RESTRICT dst = reinterpret_cast<uint32_t*>(dstRow);
- unsigned alphaMask = 0xFF;
- for (int x = 0; x < width; x++) {
- unsigned alpha = src[3];
- dst[x] = SkPackARGB32NoCheck(alpha, src[0], src[1], src[2]);
- src += deltaSrc;
- alphaMask &= alpha;
- }
- return alphaMask != 0xFF;
-}
-
-static bool Sample_RGBA_D8888_SkipZ(void* SK_RESTRICT dstRow,
- const uint8_t* SK_RESTRICT src,
- int width, int deltaSrc, int,
- const SkPMColor[]) {
- SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
- unsigned alphaMask = 0xFF;
- for (int x = 0; x < width; x++) {
- unsigned alpha = src[3];
- if (0 != alpha) {
- dst[x] = SkPreMultiplyARGB(alpha, src[0], src[1], src[2]);
- }
- src += deltaSrc;
- alphaMask &= alpha;
- }
- return alphaMask != 0xFF;
-}
-
-static SkScaledBitmapSampler::RowProc
-get_RGBA_to_8888_proc(const SkScaledBitmapSampler::Options& opts) {
- // Dither has no effect.
- if (!opts.fPremultiplyAlpha) {
- // We could check each component for a zero, at the expense of extra checks.
- // For now, just return unpremul.
- return Sample_RGBA_D8888_Unpremul;
- }
- // Supply the versions that premultiply the colors
- if (opts.fSkipZeros) {
- return Sample_RGBA_D8888_SkipZ;
- }
- return Sample_RGBA_D8888;
-}
-
-// 565
-
-static bool Sample_Gray_D565(void* SK_RESTRICT dstRow,
- const uint8_t* SK_RESTRICT src,
- int width, int deltaSrc, int, const SkPMColor[]) {
- uint16_t* SK_RESTRICT dst = (uint16_t*)dstRow;
- for (int x = 0; x < width; x++) {
- dst[x] = SkPack888ToRGB16(src[0], src[0], src[0]);
- src += deltaSrc;
- }
- return false;
-}
-
-static bool Sample_Gray_D565_D(void* SK_RESTRICT dstRow,
- const uint8_t* SK_RESTRICT src,
- int width, int deltaSrc, int y, const SkPMColor[]) {
- uint16_t* SK_RESTRICT dst = (uint16_t*)dstRow;
- DITHER_565_SCAN(y);
- for (int x = 0; x < width; x++) {
- dst[x] = SkDitherRGBTo565(src[0], src[0], src[0], DITHER_VALUE(x));
- src += deltaSrc;
- }
- return false;
-}
-
-static SkScaledBitmapSampler::RowProc
-get_gray_to_565_proc(const SkScaledBitmapSampler::Options& opts) {
- // Unpremul and skip zeroes make no difference
- if (opts.fDither) {
- return Sample_Gray_D565_D;
- }
- return Sample_Gray_D565;
-}
-
-static bool Sample_RGBx_D565(void* SK_RESTRICT dstRow,
- const uint8_t* SK_RESTRICT src,
- int width, int deltaSrc, int, const SkPMColor[]) {
- uint16_t* SK_RESTRICT dst = (uint16_t*)dstRow;
- for (int x = 0; x < width; x++) {
- dst[x] = SkPack888ToRGB16(src[0], src[1], src[2]);
- src += deltaSrc;
- }
- return false;
-}
-
-static bool Sample_RGBx_D565_D(void* SK_RESTRICT dstRow,
- const uint8_t* SK_RESTRICT src,
- int width, int deltaSrc, int y,
- const SkPMColor[]) {
- uint16_t* SK_RESTRICT dst = (uint16_t*)dstRow;
- DITHER_565_SCAN(y);
- for (int x = 0; x < width; x++) {
- dst[x] = SkDitherRGBTo565(src[0], src[1], src[2], DITHER_VALUE(x));
- src += deltaSrc;
- }
- return false;
-}
-
-static SkScaledBitmapSampler::RowProc
-get_RGBx_to_565_proc(const SkScaledBitmapSampler::Options& opts) {
- // Unpremul and skip zeroes make no difference
- if (opts.fDither) {
- return Sample_RGBx_D565_D;
- }
- return Sample_RGBx_D565;
-}
-
-
-static bool Sample_D565_D565(void* SK_RESTRICT dstRow,
- const uint8_t* SK_RESTRICT src,
- int width, int deltaSrc, int, const SkPMColor[]) {
- uint16_t* SK_RESTRICT dst = (uint16_t*)dstRow;
- uint16_t* SK_RESTRICT castedSrc = (uint16_t*) src;
- for (int x = 0; x < width; x++) {
- dst[x] = castedSrc[0];
- castedSrc += deltaSrc >> 1;
- }
- return false;
-}
-
-static SkScaledBitmapSampler::RowProc
-get_565_to_565_proc(const SkScaledBitmapSampler::Options& opts) {
- // Unpremul, dither, and skip zeroes have no effect
- return Sample_D565_D565;
-}
-
-// 4444
-
-static bool Sample_Gray_D4444(void* SK_RESTRICT dstRow,
- const uint8_t* SK_RESTRICT src,
- int width, int deltaSrc, int, const SkPMColor[]) {
- SkPMColor16* SK_RESTRICT dst = (SkPMColor16*)dstRow;
- for (int x = 0; x < width; x++) {
- unsigned gray = src[0] >> 4;
- dst[x] = SkPackARGB4444(0xF, gray, gray, gray);
- src += deltaSrc;
- }
- return false;
-}
-
-static bool Sample_Gray_D4444_D(void* SK_RESTRICT dstRow,
- const uint8_t* SK_RESTRICT src,
- int width, int deltaSrc, int y, const SkPMColor[]) {
- SkPMColor16* SK_RESTRICT dst = (SkPMColor16*)dstRow;
- DITHER_4444_SCAN(y);
- for (int x = 0; x < width; x++) {
- dst[x] = SkDitherARGB32To4444(0xFF, src[0], src[0], src[0],
- DITHER_VALUE(x));
- src += deltaSrc;
- }
- return false;
-}
-
-static SkScaledBitmapSampler::RowProc
-get_gray_to_4444_proc(const SkScaledBitmapSampler::Options& opts) {
- // Skip zeroes and unpremul make no difference
- if (opts.fDither) {
- return Sample_Gray_D4444_D;
- }
- return Sample_Gray_D4444;
-}
-
-static bool Sample_RGBx_D4444(void* SK_RESTRICT dstRow,
- const uint8_t* SK_RESTRICT src,
- int width, int deltaSrc, int, const SkPMColor[]) {
- SkPMColor16* SK_RESTRICT dst = (SkPMColor16*)dstRow;
- for (int x = 0; x < width; x++) {
- dst[x] = SkPackARGB4444(0xF, src[0] >> 4, src[1] >> 4, src[2] >> 4);
- src += deltaSrc;
- }
- return false;
-}
-
-static bool Sample_RGBx_D4444_D(void* SK_RESTRICT dstRow,
- const uint8_t* SK_RESTRICT src,
- int width, int deltaSrc, int y, const SkPMColor[]) {
- SkPMColor16* dst = (SkPMColor16*)dstRow;
- DITHER_4444_SCAN(y);
-
- for (int x = 0; x < width; x++) {
- dst[x] = SkDitherARGB32To4444(0xFF, src[0], src[1], src[2],
- DITHER_VALUE(x));
- src += deltaSrc;
- }
- return false;
-}
-
-static SkScaledBitmapSampler::RowProc
-get_RGBx_to_4444_proc(const SkScaledBitmapSampler::Options& opts) {
- // Skip zeroes and unpremul make no difference
- if (opts.fDither) {
- return Sample_RGBx_D4444_D;
- }
- return Sample_RGBx_D4444;
-}
-
-static bool Sample_RGBA_D4444(void* SK_RESTRICT dstRow,
- const uint8_t* SK_RESTRICT src,
- int width, int deltaSrc, int, const SkPMColor[]) {
- SkPMColor16* SK_RESTRICT dst = (SkPMColor16*)dstRow;
- unsigned alphaMask = 0xFF;
-
- for (int x = 0; x < width; x++) {
- unsigned alpha = src[3];
- SkPMColor c = SkPreMultiplyARGB(alpha, src[0], src[1], src[2]);
- dst[x] = SkPixel32ToPixel4444(c);
- src += deltaSrc;
- alphaMask &= alpha;
- }
- return alphaMask != 0xFF;
-}
-
-static bool Sample_RGBA_D4444_SkipZ(void* SK_RESTRICT dstRow,
- const uint8_t* SK_RESTRICT src,
- int width, int deltaSrc, int,
- const SkPMColor[]) {
- SkPMColor16* SK_RESTRICT dst = (SkPMColor16*)dstRow;
- unsigned alphaMask = 0xFF;
-
- for (int x = 0; x < width; x++) {
- unsigned alpha = src[3];
- if (alpha != 0) {
- SkPMColor c = SkPreMultiplyARGB(alpha, src[0], src[1], src[2]);
- dst[x] = SkPixel32ToPixel4444(c);
- }
- src += deltaSrc;
- alphaMask &= alpha;
- }
- return alphaMask != 0xFF;
-}
-
-
-static bool Sample_RGBA_D4444_D(void* SK_RESTRICT dstRow,
- const uint8_t* SK_RESTRICT src,
- int width, int deltaSrc, int y,
- const SkPMColor[]) {
- SkPMColor16* SK_RESTRICT dst = (SkPMColor16*)dstRow;
- unsigned alphaMask = 0xFF;
- DITHER_4444_SCAN(y);
-
- for (int x = 0; x < width; x++) {
- unsigned alpha = src[3];
- SkPMColor c = SkPreMultiplyARGB(alpha, src[0], src[1], src[2]);
- dst[x] = SkDitherARGB32To4444(c, DITHER_VALUE(x));
- src += deltaSrc;
- alphaMask &= alpha;
- }
- return alphaMask != 0xFF;
-}
-
-static bool Sample_RGBA_D4444_D_SkipZ(void* SK_RESTRICT dstRow,
- const uint8_t* SK_RESTRICT src,
- int width, int deltaSrc, int y,
- const SkPMColor[]) {
- SkPMColor16* SK_RESTRICT dst = (SkPMColor16*)dstRow;
- unsigned alphaMask = 0xFF;
- DITHER_4444_SCAN(y);
-
- for (int x = 0; x < width; x++) {
- unsigned alpha = src[3];
- if (alpha != 0) {
- SkPMColor c = SkPreMultiplyARGB(alpha, src[0], src[1], src[2]);
- dst[x] = SkDitherARGB32To4444(c, DITHER_VALUE(x));
- }
- src += deltaSrc;
- alphaMask &= alpha;
- }
- return alphaMask != 0xFF;
-}
-
-static SkScaledBitmapSampler::RowProc
-get_RGBA_to_4444_proc(const SkScaledBitmapSampler::Options& opts) {
- if (!opts.fPremultiplyAlpha) {
- // Unpremultiplied is not supported for 4444
- return nullptr;
- }
- if (opts.fSkipZeros) {
- if (opts.fDither) {
- return Sample_RGBA_D4444_D_SkipZ;
- }
- return Sample_RGBA_D4444_SkipZ;
- }
- if (opts.fDither) {
- return Sample_RGBA_D4444_D;
- }
- return Sample_RGBA_D4444;
-}
-
-// Index
-
-#define A32_MASK_IN_PLACE (SkPMColor)(SK_A32_MASK << SK_A32_SHIFT)
-
-static bool Sample_Index_D8888(void* SK_RESTRICT dstRow,
- const uint8_t* SK_RESTRICT src,
- int width, int deltaSrc, int, const SkPMColor ctable[]) {
-
- SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
- SkPMColor cc = A32_MASK_IN_PLACE;
- for (int x = 0; x < width; x++) {
- SkPMColor c = ctable[*src];
- cc &= c;
- dst[x] = c;
- src += deltaSrc;
- }
- return cc != A32_MASK_IN_PLACE;
-}
-
-static bool Sample_Index_D8888_SkipZ(void* SK_RESTRICT dstRow,
- const uint8_t* SK_RESTRICT src,
- int width, int deltaSrc, int,
- const SkPMColor ctable[]) {
-
- SkPMColor* SK_RESTRICT dst = (SkPMColor*)dstRow;
- SkPMColor cc = A32_MASK_IN_PLACE;
- for (int x = 0; x < width; x++) {
- SkPMColor c = ctable[*src];
- cc &= c;
- if (c != 0) {
- dst[x] = c;
- }
- src += deltaSrc;
- }
- return cc != A32_MASK_IN_PLACE;
-}
-
-static SkScaledBitmapSampler::RowProc
-get_index_to_8888_proc(const SkScaledBitmapSampler::Options& opts) {
- // The caller is expected to have created the source colortable
- // properly with respect to opts.fPremultiplyAlpha, so premul makes
- // no difference here.
- // Dither makes no difference
- if (opts.fSkipZeros) {
- return Sample_Index_D8888_SkipZ;
- }
- return Sample_Index_D8888;
-}
-
-static bool Sample_Index_D565(void* SK_RESTRICT dstRow,
- const uint8_t* SK_RESTRICT src,
- int width, int deltaSrc, int, const SkPMColor ctable[]) {
-
- uint16_t* SK_RESTRICT dst = (uint16_t*)dstRow;
- for (int x = 0; x < width; x++) {
- dst[x] = SkPixel32ToPixel16(ctable[*src]);
- src += deltaSrc;
- }
- return false;
-}
-
-static bool Sample_Index_D565_D(void* SK_RESTRICT dstRow,
- const uint8_t* SK_RESTRICT src, int width,
- int deltaSrc, int y, const SkPMColor ctable[]) {
-
- uint16_t* SK_RESTRICT dst = (uint16_t*)dstRow;
- DITHER_565_SCAN(y);
-
- for (int x = 0; x < width; x++) {
- SkPMColor c = ctable[*src];
- dst[x] = SkDitherRGBTo565(SkGetPackedR32(c), SkGetPackedG32(c),
- SkGetPackedB32(c), DITHER_VALUE(x));
- src += deltaSrc;
- }
- return false;
-}
-
-static SkScaledBitmapSampler::RowProc
-get_index_to_565_proc(const SkScaledBitmapSampler::Options& opts) {
- // Unpremultiplied and skip zeroes make no difference
- if (opts.fDither) {
- return Sample_Index_D565_D;
- }
- return Sample_Index_D565;
-}
-
-static bool Sample_Index_D4444(void* SK_RESTRICT dstRow,
- const uint8_t* SK_RESTRICT src, int width,
- int deltaSrc, int y, const SkPMColor ctable[]) {
-
- SkPMColor16* SK_RESTRICT dst = (SkPMColor16*)dstRow;
- SkPMColor cc = A32_MASK_IN_PLACE;
- for (int x = 0; x < width; x++) {
- SkPMColor c = ctable[*src];
- cc &= c;
- dst[x] = SkPixel32ToPixel4444(c);
- src += deltaSrc;
- }
- return cc != A32_MASK_IN_PLACE;
-}
-
-static bool Sample_Index_D4444_D(void* SK_RESTRICT dstRow,
- const uint8_t* SK_RESTRICT src, int width,
- int deltaSrc, int y, const SkPMColor ctable[]) {
-
- SkPMColor16* SK_RESTRICT dst = (SkPMColor16*)dstRow;
- SkPMColor cc = A32_MASK_IN_PLACE;
- DITHER_4444_SCAN(y);
-
- for (int x = 0; x < width; x++) {
- SkPMColor c = ctable[*src];
- cc &= c;
- dst[x] = SkDitherARGB32To4444(c, DITHER_VALUE(x));
- src += deltaSrc;
- }
- return cc != A32_MASK_IN_PLACE;
-}
-
-static bool Sample_Index_D4444_SkipZ(void* SK_RESTRICT dstRow,
- const uint8_t* SK_RESTRICT src, int width,
- int deltaSrc, int y, const SkPMColor ctable[]) {
-
- SkPMColor16* SK_RESTRICT dst = (SkPMColor16*)dstRow;
- SkPMColor cc = A32_MASK_IN_PLACE;
- for (int x = 0; x < width; x++) {
- SkPMColor c = ctable[*src];
- cc &= c;
- if (c != 0) {
- dst[x] = SkPixel32ToPixel4444(c);
- }
- src += deltaSrc;
- }
- return cc != A32_MASK_IN_PLACE;
-}
-
-static bool Sample_Index_D4444_D_SkipZ(void* SK_RESTRICT dstRow,
- const uint8_t* SK_RESTRICT src, int width,
- int deltaSrc, int y, const SkPMColor ctable[]) {
-
- SkPMColor16* SK_RESTRICT dst = (SkPMColor16*)dstRow;
- SkPMColor cc = A32_MASK_IN_PLACE;
- DITHER_4444_SCAN(y);
-
- for (int x = 0; x < width; x++) {
- SkPMColor c = ctable[*src];
- cc &= c;
- if (c != 0) {
- dst[x] = SkDitherARGB32To4444(c, DITHER_VALUE(x));
- }
- src += deltaSrc;
- }
- return cc != A32_MASK_IN_PLACE;
-}
-
-static SkScaledBitmapSampler::RowProc
-get_index_to_4444_proc(const SkScaledBitmapSampler::Options& opts) {
- // Unpremul not allowed
- if (!opts.fPremultiplyAlpha) {
- return nullptr;
- }
- if (opts.fSkipZeros) {
- if (opts.fDither) {
- return Sample_Index_D4444_D_SkipZ;
- }
- return Sample_Index_D4444_SkipZ;
- }
- if (opts.fDither) {
- return Sample_Index_D4444_D;
- }
- return Sample_Index_D4444;
-}
-
-static bool Sample_Index_DI(void* SK_RESTRICT dstRow,
- const uint8_t* SK_RESTRICT src,
- int width, int deltaSrc, int, const SkPMColor[]) {
- if (1 == deltaSrc) {
- memcpy(dstRow, src, width);
- } else {
- uint8_t* SK_RESTRICT dst = (uint8_t*)dstRow;
- for (int x = 0; x < width; x++) {
- dst[x] = src[0];
- src += deltaSrc;
- }
- }
- return false;
-}
-
-static SkScaledBitmapSampler::RowProc
-get_index_to_index_proc(const SkScaledBitmapSampler::Options& opts) {
- // Unpremul not allowed
- if (!opts.fPremultiplyAlpha) {
- return nullptr;
- }
- // Ignore dither and skip zeroes
- return Sample_Index_DI;
-}
-
-// A8
-static bool Sample_Gray_DA8(void* SK_RESTRICT dstRow,
- const uint8_t* SK_RESTRICT src,
- int width, int deltaSrc, int,
- const SkPMColor[]) {
- // Sampling Gray to A8 uses the same function as Index to Index8,
- // except we assume that there is alpha for speed, since an A8
- // bitmap with no alpha is not interesting.
- (void) Sample_Index_DI(dstRow, src, width, deltaSrc, /* y unused */ 0,
- /* ctable unused */ nullptr);
- return true;
-}
-
-static SkScaledBitmapSampler::RowProc
-get_gray_to_A8_proc(const SkScaledBitmapSampler::Options& opts) {
- if (!opts.fPremultiplyAlpha) {
- return nullptr;
- }
- // Ignore skip and dither.
- return Sample_Gray_DA8;
-}
-
-typedef SkScaledBitmapSampler::RowProc (*RowProcChooser)(const SkScaledBitmapSampler::Options&);
-///////////////////////////////////////////////////////////////////////////////
-
-#include "SkScaledBitmapSampler.h"
-
-SkScaledBitmapSampler::SkScaledBitmapSampler(int width, int height,
- int sampleSize) {
- fCTable = nullptr;
- fDstRow = nullptr;
- fRowProc = nullptr;
-
- if (width <= 0 || height <= 0) {
- sk_throw();
- }
-
- SkDEBUGCODE(fSampleMode = kUninitialized_SampleMode);
-
- if (sampleSize <= 1) {
- fScaledWidth = width;
- fScaledHeight = height;
- fX0 = fY0 = 0;
- fDX = fDY = 1;
- return;
- }
-
- int dx = SkMin32(sampleSize, width);
- int dy = SkMin32(sampleSize, height);
-
- fScaledWidth = width / dx;
- fScaledHeight = height / dy;
-
- SkASSERT(fScaledWidth > 0);
- SkASSERT(fScaledHeight > 0);
-
- fX0 = dx >> 1;
- fY0 = dy >> 1;
-
- SkASSERT(fX0 >= 0 && fX0 < width);
- SkASSERT(fY0 >= 0 && fY0 < height);
-
- fDX = dx;
- fDY = dy;
-
- SkASSERT(fDX > 0 && (fX0 + fDX * (fScaledWidth - 1)) < width);
- SkASSERT(fDY > 0 && (fY0 + fDY * (fScaledHeight - 1)) < height);
-}
-
-bool SkScaledBitmapSampler::begin(SkBitmap* dst, SrcConfig sc,
- const Options& opts,
- const SkPMColor ctable[]) {
- static const RowProcChooser gProcChoosers[] = {
- get_gray_to_8888_proc,
- get_RGBx_to_8888_proc,
- get_RGBA_to_8888_proc,
- get_index_to_8888_proc,
- nullptr, // 565 to 8888
-
- get_gray_to_565_proc,
- get_RGBx_to_565_proc,
- get_RGBx_to_565_proc, // The source alpha will be ignored.
- get_index_to_565_proc,
- get_565_to_565_proc,
-
- get_gray_to_4444_proc,
- get_RGBx_to_4444_proc,
- get_RGBA_to_4444_proc,
- get_index_to_4444_proc,
- nullptr, // 565 to 4444
-
- nullptr, // gray to index
- nullptr, // rgbx to index
- nullptr, // rgba to index
- get_index_to_index_proc,
- nullptr, // 565 to index
-
- get_gray_to_A8_proc,
- nullptr, // rgbx to a8
- nullptr, // rgba to a8
- nullptr, // index to a8
- nullptr, // 565 to a8
- };
-
- // The jump between dst configs in the table
- static const int gProcDstConfigSpan = 5;
- static_assert(SK_ARRAY_COUNT(gProcChoosers) == 5 * gProcDstConfigSpan,
- "gProcs_has_the_wrong_number_of_entries");
-
- fCTable = ctable;
-
- int index = 0;
- switch (sc) {
- case SkScaledBitmapSampler::kGray:
- fSrcPixelSize = 1;
- index += 0;
- break;
- case SkScaledBitmapSampler::kRGB:
- fSrcPixelSize = 3;
- index += 1;
- break;
- case SkScaledBitmapSampler::kRGBX:
- fSrcPixelSize = 4;
- index += 1;
- break;
- case SkScaledBitmapSampler::kRGBA:
- fSrcPixelSize = 4;
- index += 2;
- break;
- case SkScaledBitmapSampler::kIndex:
- fSrcPixelSize = 1;
- index += 3;
- break;
- case SkScaledBitmapSampler::kRGB_565:
- fSrcPixelSize = 2;
- index += 4;
- break;
- default:
- return false;
- }
-
- switch (dst->colorType()) {
- case kN32_SkColorType:
- index += 0 * gProcDstConfigSpan;
- break;
- case kRGB_565_SkColorType:
- index += 1 * gProcDstConfigSpan;
- break;
- case kARGB_4444_SkColorType:
- index += 2 * gProcDstConfigSpan;
- break;
- case kIndex_8_SkColorType:
- index += 3 * gProcDstConfigSpan;
- break;
- case kAlpha_8_SkColorType:
- index += 4 * gProcDstConfigSpan;
- break;
- default:
- return false;
- }
-
- RowProcChooser chooser = gProcChoosers[index];
- if (nullptr == chooser) {
- fRowProc = nullptr;
- } else {
- fRowProc = chooser(opts);
- }
- fDstRow = (char*)dst->getPixels();
- fDstRowBytes = dst->rowBytes();
- fCurrY = 0;
- return fRowProc != nullptr;
-}
-
-bool SkScaledBitmapSampler::begin(SkBitmap* dst, SrcConfig sc,
- const SkImageDecoder& decoder,
- const SkPMColor ctable[]) {
- return this->begin(dst, sc, Options(decoder), ctable);
-}
-
-bool SkScaledBitmapSampler::next(const uint8_t* SK_RESTRICT src) {
- SkASSERT(kInterlaced_SampleMode != fSampleMode);
- SkDEBUGCODE(fSampleMode = kConsecutive_SampleMode);
- SkASSERT((unsigned)fCurrY < (unsigned)fScaledHeight);
-
- bool hadAlpha = fRowProc(fDstRow, src + fX0 * fSrcPixelSize, fScaledWidth,
- fDX * fSrcPixelSize, fCurrY, fCTable);
- fDstRow += fDstRowBytes;
- fCurrY += 1;
- return hadAlpha;
-}
-
-bool SkScaledBitmapSampler::sampleInterlaced(const uint8_t* SK_RESTRICT src, int srcY) {
- SkASSERT(kConsecutive_SampleMode != fSampleMode);
- SkDEBUGCODE(fSampleMode = kInterlaced_SampleMode);
- // Any line that should be a part of the destination can be created by the formula:
- // fY0 + (some multiplier) * fDY
- // so if srcY - fY0 is not an integer multiple of fDY that srcY will be skipped.
- const int srcYMinusY0 = srcY - fY0;
- if (srcYMinusY0 % fDY != 0) {
- // This line is not part of the output, so return false for alpha, since we have
- // not added an alpha to the output.
- return false;
- }
- // Unlike in next(), where the data is used sequentially, this function skips around,
- // so fDstRow and fCurrY are never updated. fDstRow must always be the starting point
- // of the destination bitmap's pixels, which is used to calculate the destination row
- // each time this function is called.
- const int dstY = srcYMinusY0 / fDY;
- if (dstY >= fScaledHeight) {
- return false;
- }
- char* dstRow = fDstRow + dstY * fDstRowBytes;
- return fRowProc(dstRow, src + fX0 * fSrcPixelSize, fScaledWidth,
- fDX * fSrcPixelSize, dstY, fCTable);
-}
-
-#ifdef SK_DEBUG
-// The following code is for a test to ensure that changing the method to get the right row proc
-// did not change the row proc unintentionally. Tested by ImageDecodingTest.cpp
-
-// friend of SkScaledBitmapSampler solely for the purpose of accessing fRowProc.
-class RowProcTester {
-public:
- static SkScaledBitmapSampler::RowProc getRowProc(const SkScaledBitmapSampler& sampler) {
- return sampler.fRowProc;
- }
-};
-
-
-// Table showing the expected RowProc for each combination of inputs.
-// Table formated as follows:
-// Each group of 5 consecutive rows represents sampling from a single
-// SkScaledBitmapSampler::SrcConfig.
-// Within each set, each row represents a different destination SkBitmap::Config
-// Each column represents a different combination of dither and unpremul.
-// D = dither ~D = no dither
-// U = unpremul ~U = no unpremul
-// ~D~U D~U ~DU DU
-SkScaledBitmapSampler::RowProc gTestProcs[] = {
- // Gray
- Sample_Gray_DA8, Sample_Gray_DA8, nullptr, nullptr, // to A8
- nullptr, nullptr, nullptr, nullptr, // to Index8
- Sample_Gray_D565, Sample_Gray_D565_D, Sample_Gray_D565, Sample_Gray_D565_D, // to 565
- Sample_Gray_D4444, Sample_Gray_D4444_D, Sample_Gray_D4444, Sample_Gray_D4444_D, // to 4444
- Sample_Gray_D8888, Sample_Gray_D8888, Sample_Gray_D8888, Sample_Gray_D8888, // to 8888
- // Index
- nullptr, nullptr, nullptr, nullptr, // to A8
- Sample_Index_DI, Sample_Index_DI, nullptr, nullptr, // to Index8
- Sample_Index_D565, Sample_Index_D565_D, Sample_Index_D565, Sample_Index_D565_D, // to 565
- Sample_Index_D4444, Sample_Index_D4444_D, nullptr, nullptr, // to 4444
- Sample_Index_D8888, Sample_Index_D8888, Sample_Index_D8888, Sample_Index_D8888, // to 8888
- // RGB
- nullptr, nullptr, nullptr, nullptr, // to A8
- nullptr, nullptr, nullptr, nullptr, // to Index8
- Sample_RGBx_D565, Sample_RGBx_D565_D, Sample_RGBx_D565, Sample_RGBx_D565_D, // to 565
- Sample_RGBx_D4444, Sample_RGBx_D4444_D, Sample_RGBx_D4444, Sample_RGBx_D4444_D, // to 4444
- Sample_RGBx_D8888, Sample_RGBx_D8888, Sample_RGBx_D8888, Sample_RGBx_D8888, // to 8888
- // RGBx is the same as RGB
- nullptr, nullptr, nullptr, nullptr, // to A8
- nullptr, nullptr, nullptr, nullptr, // to Index8
- Sample_RGBx_D565, Sample_RGBx_D565_D, Sample_RGBx_D565, Sample_RGBx_D565_D, // to 565
- Sample_RGBx_D4444, Sample_RGBx_D4444_D, Sample_RGBx_D4444, Sample_RGBx_D4444_D, // to 4444
- Sample_RGBx_D8888, Sample_RGBx_D8888, Sample_RGBx_D8888, Sample_RGBx_D8888, // to 8888
- // RGBA
- nullptr, nullptr, nullptr, nullptr, // to A8
- nullptr, nullptr, nullptr, nullptr, // to Index8
- Sample_RGBx_D565, Sample_RGBx_D565_D, Sample_RGBx_D565, Sample_RGBx_D565_D, // to 565
- Sample_RGBA_D4444, Sample_RGBA_D4444_D, nullptr, nullptr, // to 4444
- Sample_RGBA_D8888, Sample_RGBA_D8888, Sample_RGBA_D8888_Unpremul, Sample_RGBA_D8888_Unpremul, // to 8888
- // RGB_565
- nullptr, nullptr, nullptr, nullptr, // to A8
- nullptr, nullptr, nullptr, nullptr, // to Index8
- Sample_D565_D565, Sample_D565_D565, Sample_D565_D565, Sample_D565_D565, // to 565
- nullptr, nullptr, nullptr, nullptr, // to 4444
- nullptr, nullptr, nullptr, nullptr, // to 8888
-};
-
-// Dummy class that allows instantiation of an ImageDecoder, so begin can query its fields.
-class DummyDecoder : public SkImageDecoder {
-public:
- DummyDecoder() {}
-protected:
- Result onDecode(SkStream*, SkBitmap*, SkImageDecoder::Mode) override {
- return kFailure;
- }
-};
-
-void test_row_proc_choice();
-void test_row_proc_choice() {
- const SkColorType colorTypes[] = {
- kAlpha_8_SkColorType, kIndex_8_SkColorType, kRGB_565_SkColorType, kARGB_4444_SkColorType,
- kN32_SkColorType
- };
-
- SkBitmap dummyBitmap;
- DummyDecoder dummyDecoder;
- size_t procCounter = 0;
- for (int sc = SkScaledBitmapSampler::kGray; sc <= SkScaledBitmapSampler::kRGB_565; ++sc) {
- for (size_t c = 0; c < SK_ARRAY_COUNT(colorTypes); ++c) {
- for (int unpremul = 0; unpremul <= 1; ++unpremul) {
- for (int dither = 0; dither <= 1; ++dither) {
- // Arbitrary width/height/sampleSize to allow SkScaledBitmapSampler to
- // be considered valid.
- SkScaledBitmapSampler sampler(10, 10, 1);
- dummyBitmap.setInfo(SkImageInfo::Make(10, 10,
- colorTypes[c], kPremul_SkAlphaType));
- dummyDecoder.setDitherImage(SkToBool(dither));
- dummyDecoder.setRequireUnpremultipliedColors(SkToBool(unpremul));
- sampler.begin(&dummyBitmap, (SkScaledBitmapSampler::SrcConfig) sc,
- dummyDecoder);
- SkScaledBitmapSampler::RowProc expected = gTestProcs[procCounter];
- SkScaledBitmapSampler::RowProc actual = RowProcTester::getRowProc(sampler);
- SkASSERT(expected == actual);
- procCounter++;
- }
- }
- }
- }
- SkASSERT(SK_ARRAY_COUNT(gTestProcs) == procCounter);
-}
-#endif // SK_DEBUG
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