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Unified Diff: src/codec/SkMaskSwizzler.cpp

Issue 947283002: Bmp Image Decoding (Closed) Base URL: https://skia.googlesource.com/skia.git@decode-leon-3
Patch Set: Original change plus fix Created 5 years, 9 months ago
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Index: src/codec/SkMaskSwizzler.cpp
diff --git a/src/codec/SkMaskSwizzler.cpp b/src/codec/SkMaskSwizzler.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..8d9f6c66b3ac007e955118b872d244b52614ea3b
--- /dev/null
+++ b/src/codec/SkMaskSwizzler.cpp
@@ -0,0 +1,205 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkCodecPriv.h"
+#include "SkColorPriv.h"
+#include "SkMaskSwizzler.h"
+
+/*
+ *
+ * Row procedure for masked color components with 16 bits per pixel
+ *
+ */
+static SkSwizzler::ResultAlpha swizzle_mask16_to_n32(
+ void* dstRow, const uint8_t* srcRow, int width, SkMasks* masks) {
+
+ // Use the masks to decode to the destination
+ uint16_t* srcPtr = (uint16_t*) srcRow;
+ SkPMColor* dstPtr = (SkPMColor*) dstRow;
+ for (int i = 0; i < width; i++) {
+ uint16_t p = srcPtr[i];
+ uint8_t red = masks->getRed(p);
+ uint8_t green = masks->getGreen(p);
+ uint8_t blue = masks->getBlue(p);
+ dstPtr[i] = SkPackARGB32NoCheck(0xFF, red, green, blue);
+ }
+ return SkSwizzler::kOpaque_ResultAlpha;
+}
+
+/*
+ *
+ * Row procedure for masked color components with 16 bits per pixel with alpha
+ *
+ */
+static SkSwizzler::ResultAlpha swizzle_mask16_alpha_to_n32(
+ void* dstRow, const uint8_t* srcRow, int width, SkMasks* masks) {
+
+ // Use the masks to decode to the destination
+ uint16_t* srcPtr = (uint16_t*) srcRow;
+ SkPMColor* dstPtr = (SkPMColor*) dstRow;
+ INIT_RESULT_ALPHA;
+ for (int i = 0; i < width; i++) {
+ uint16_t p = srcPtr[i];
+ uint8_t red = masks->getRed(p);
+ uint8_t green = masks->getGreen(p);
+ uint8_t blue = masks->getBlue(p);
+ uint8_t alpha = masks->getAlpha(p);
+ UPDATE_RESULT_ALPHA(alpha);
+ dstPtr[i] = SkPackARGB32NoCheck(alpha, red, green, blue);
+ }
+ return COMPUTE_RESULT_ALPHA;
+}
+
+/*
+ *
+ * Row procedure for masked color components with 24 bits per pixel
+ *
+ */
+static SkSwizzler::ResultAlpha swizzle_mask24_to_n32(
+ void* dstRow, const uint8_t* srcRow, int width, SkMasks* masks) {
+
+ // Use the masks to decode to the destination
+ SkPMColor* dstPtr = (SkPMColor*) dstRow;
+ for (int i = 0; i < 3*width; i += 3) {
+ uint32_t p = srcRow[i] | (srcRow[i + 1] << 8) | srcRow[i + 2] << 16;
+ uint8_t red = masks->getRed(p);
+ uint8_t green = masks->getGreen(p);
+ uint8_t blue = masks->getBlue(p);
+ dstPtr[i/3] = SkPackARGB32NoCheck(0xFF, red, green, blue);
+ }
+ return SkSwizzler::kOpaque_ResultAlpha;
+}
+
+/*
+ *
+ * Row procedure for masked color components with 24 bits per pixel with alpha
+ *
+ */
+static SkSwizzler::ResultAlpha swizzle_mask24_alpha_to_n32(
+ void* dstRow, const uint8_t* srcRow, int width, SkMasks* masks) {
+
+ // Use the masks to decode to the destination
+ SkPMColor* dstPtr = (SkPMColor*) dstRow;
+ INIT_RESULT_ALPHA;
+ for (int i = 0; i < 3*width; i += 3) {
+ uint32_t p = srcRow[i] | (srcRow[i + 1] << 8) | srcRow[i + 2] << 16;
+ uint8_t red = masks->getRed(p);
+ uint8_t green = masks->getGreen(p);
+ uint8_t blue = masks->getBlue(p);
+ uint8_t alpha = masks->getAlpha(p);
+ UPDATE_RESULT_ALPHA(alpha);
+ dstPtr[i/3] = SkPackARGB32NoCheck(alpha, red, green, blue);
+ }
+ return COMPUTE_RESULT_ALPHA;
+}
+
+/*
+ *
+ * Row procedure for masked color components with 32 bits per pixel
+ *
+ */
+static SkSwizzler::ResultAlpha swizzle_mask32_to_n32(
+ void* dstRow, const uint8_t* srcRow, int width, SkMasks* masks) {
+
+ // Use the masks to decode to the destination
+ uint32_t* srcPtr = (uint32_t*) srcRow;
+ SkPMColor* dstPtr = (SkPMColor*) dstRow;
+ for (int i = 0; i < width; i++) {
+ uint32_t p = srcPtr[i];
+ uint8_t red = masks->getRed(p);
+ uint8_t green = masks->getGreen(p);
+ uint8_t blue = masks->getBlue(p);
+ dstPtr[i] = SkPackARGB32NoCheck(0xFF, red, green, blue);
+ }
+ return SkSwizzler::kOpaque_ResultAlpha;
+}
+
+/*
+ *
+ * Row procedure for masked color components with 32 bits per pixel
+ *
+ */
+static SkSwizzler::ResultAlpha swizzle_mask32_alpha_to_n32(
+ void* dstRow, const uint8_t* srcRow, int width, SkMasks* masks) {
+
+ // Use the masks to decode to the destination
+ uint32_t* srcPtr = (uint32_t*) srcRow;
+ SkPMColor* dstPtr = (SkPMColor*) dstRow;
+ INIT_RESULT_ALPHA;
+ for (int i = 0; i < width; i++) {
+ uint32_t p = srcPtr[i];
+ uint8_t red = masks->getRed(p);
+ uint8_t green = masks->getGreen(p);
+ uint8_t blue = masks->getBlue(p);
+ uint8_t alpha = masks->getAlpha(p);
+ UPDATE_RESULT_ALPHA(alpha);
+ dstPtr[i] = SkPackARGB32NoCheck(alpha, red, green, blue);
+ }
+ return COMPUTE_RESULT_ALPHA;
+}
+
+/*
+ *
+ * Create a new mask swizzler
+ *
+ */
+SkMaskSwizzler* SkMaskSwizzler::CreateMaskSwizzler(
+ const SkImageInfo& imageInfo, SkMasks* masks, uint32_t bitsPerPixel) {
+
+ // Choose the appropriate row procedure
+ RowProc proc = NULL;
+ uint32_t alphaMask = masks->getAlphaMask();
+ switch (bitsPerPixel) {
+ case 16:
+ if (0 == alphaMask) {
+ proc = &swizzle_mask16_to_n32;
+ } else {
+ proc = &swizzle_mask16_alpha_to_n32;
+ }
+ break;
+ case 24:
+ if (0 == alphaMask) {
+ proc = &swizzle_mask24_to_n32;
+ } else {
+ proc = &swizzle_mask24_alpha_to_n32;
+ }
+ break;
+ case 32:
+ if (0 == alphaMask) {
+ proc = &swizzle_mask32_to_n32;
+ } else {
+ proc = &swizzle_mask32_alpha_to_n32;
+ }
+ break;
+ default:
+ SkASSERT(false);
+ return NULL;
+ }
+ return SkNEW_ARGS(SkMaskSwizzler, (imageInfo, masks, proc));
+}
+
+/*
+ *
+ * Constructor for mask swizzler
+ *
+ */
+SkMaskSwizzler::SkMaskSwizzler(const SkImageInfo& imageInfo,
+ SkMasks* masks, RowProc proc)
+ : fImageInfo(imageInfo)
+ , fMasks(masks)
+ , fRowProc(proc)
+{}
+
+/*
+ *
+ * Swizzle the next row
+ *
+ */
+SkSwizzler::ResultAlpha SkMaskSwizzler::next(void* dst,
+ const uint8_t* src) {
+ return fRowProc(dst, src, fImageInfo.width(), fMasks);
+}
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