1 files changed, 259 insertions, 0 deletions
diff --git a/gfx/skia/skia/src/codec/SkCodecPriv.h b/gfx/skia/skia/src/codec/SkCodecPriv.h
new file mode 100644
index 0000000000..8d05f11e91
--- /dev/null
+++ b/gfx/skia/skia/src/codec/SkCodecPriv.h
@@ -0,0 +1,259 @@
+/*
+ * Copyright 2015 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.
+ */
+
+#ifndef SkCodecPriv_DEFINED
+#define SkCodecPriv_DEFINED
+
+#include "include/codec/SkEncodedOrigin.h"
+#include "include/core/SkImageInfo.h"
+#include "include/core/SkTypes.h"
+#include "include/private/SkColorData.h"
+#include "include/private/SkEncodedInfo.h"
+#include "src/codec/SkColorTable.h"
+#include "src/base/SkEndian.h"
+
+#ifdef SK_PRINT_CODEC_MESSAGES
+    #define SkCodecPrintf SkDebugf
+#else
+    #define SkCodecPrintf(...)
+#endif
+
+// Defined in SkCodec.cpp
+bool sk_select_xform_format(SkColorType colorType, bool forColorTable,
+                            skcms_PixelFormat* outFormat);
+
+// FIXME: Consider sharing with dm, nanbench, and tools.
+static inline float get_scale_from_sample_size(int sampleSize) {
+    return 1.0f / ((float) sampleSize);
+}
+
+static inline bool is_valid_subset(const SkIRect& subset, const SkISize& imageDims) {
+    return SkIRect::MakeSize(imageDims).contains(subset);
+}
+
+/*
+ * returns a scaled dimension based on the original dimension and the sampleSize
+ * NOTE: we round down here for scaled dimension to match the behavior of SkImageDecoder
+ * FIXME: I think we should call this get_sampled_dimension().
+ */
+static inline int get_scaled_dimension(int srcDimension, int sampleSize) {
+    if (sampleSize > srcDimension) {
+        return 1;
+    }
+    return srcDimension / sampleSize;
+}
+
+/*
+ * Returns the first coordinate that we will keep during a scaled decode.
+ * The output can be interpreted as an x-coordinate or a y-coordinate.
+ *
+ * This does not need to be called and is not called when sampleFactor == 1.
+ */
+static inline int get_start_coord(int sampleFactor) { return sampleFactor / 2; }
+
+/*
+ * Given a coordinate in the original image, this returns the corresponding
+ * coordinate in the scaled image.  This function is meaningless if
+ * IsCoordNecessary returns false.
+ * The output can be interpreted as an x-coordinate or a y-coordinate.
+ *
+ * This does not need to be called and is not called when sampleFactor == 1.
+ */
+static inline int get_dst_coord(int srcCoord, int sampleFactor) { return srcCoord / sampleFactor; }
+
+/*
+ * When scaling, we will discard certain y-coordinates (rows) and
+ * x-coordinates (columns).  This function returns true if we should keep the
+ * coordinate and false otherwise.
+ * The inputs may be x-coordinates or y-coordinates.
+ *
+ * This does not need to be called and is not called when sampleFactor == 1.
+ */
+static inline bool is_coord_necessary(int srcCoord, int sampleFactor, int scaledDim) {
+    // Get the first coordinate that we want to keep
+    int startCoord = get_start_coord(sampleFactor);
+
+    // Return false on edge cases
+    if (srcCoord < startCoord || get_dst_coord(srcCoord, sampleFactor) >= scaledDim) {
+        return false;
+    }
+
+    // Every sampleFactor rows are necessary
+    return ((srcCoord - startCoord) % sampleFactor) == 0;
+}
+
+static inline bool valid_alpha(SkAlphaType dstAlpha, bool srcIsOpaque) {
+    if (kUnknown_SkAlphaType == dstAlpha) {
+        return false;
+    }
+
+    if (srcIsOpaque) {
+        if (kOpaque_SkAlphaType != dstAlpha) {
+            SkCodecPrintf("Warning: an opaque image should be decoded as opaque "
+                          "- it is being decoded as non-opaque, which will draw slower\n");
+        }
+        return true;
+    }
+
+    return dstAlpha != kOpaque_SkAlphaType;
+}
+
+/*
+ * If there is a color table, get a pointer to the colors, otherwise return nullptr
+ */
+static inline const SkPMColor* get_color_ptr(SkColorTable* colorTable) {
+     return nullptr != colorTable ? colorTable->readColors() : nullptr;
+}
+
+/*
+ * Compute row bytes for an image using pixels per byte
+ */
+static inline size_t compute_row_bytes_ppb(int width, uint32_t pixelsPerByte) {
+    return (width + pixelsPerByte - 1) / pixelsPerByte;
+}
+
+/*
+ * Compute row bytes for an image using bytes per pixel
+ */
+static inline size_t compute_row_bytes_bpp(int width, uint32_t bytesPerPixel) {
+    return width * bytesPerPixel;
+}
+
+/*
+ * Compute row bytes for an image
+ */
+static inline size_t compute_row_bytes(int width, uint32_t bitsPerPixel) {
+    if (bitsPerPixel < 16) {
+        SkASSERT(0 == 8 % bitsPerPixel);
+        const uint32_t pixelsPerByte = 8 / bitsPerPixel;
+        return compute_row_bytes_ppb(width, pixelsPerByte);
+    } else {
+        SkASSERT(0 == bitsPerPixel % 8);
+        const uint32_t bytesPerPixel = bitsPerPixel / 8;
+        return compute_row_bytes_bpp(width, bytesPerPixel);
+    }
+}
+
+/*
+ * Get a byte from a buffer
+ * This method is unsafe, the caller is responsible for performing a check
+ */
+static inline uint8_t get_byte(const uint8_t* buffer, uint32_t i) {
+    return buffer[i];
+}
+
+/*
+ * Get a short from a buffer
+ * This method is unsafe, the caller is responsible for performing a check
+ */
+static inline uint16_t get_short(const uint8_t* buffer, uint32_t i) {
+    uint16_t result;
+    memcpy(&result, &(buffer[i]), 2);
+#ifdef SK_CPU_BENDIAN
+    return SkEndianSwap16(result);
+#else
+    return result;
+#endif
+}
+
+/*
+ * Get an int from a buffer
+ * This method is unsafe, the caller is responsible for performing a check
+ */
+static inline uint32_t get_int(const uint8_t* buffer, uint32_t i) {
+    uint32_t result;
+    memcpy(&result, &(buffer[i]), 4);
+#ifdef SK_CPU_BENDIAN
+    return SkEndianSwap32(result);
+#else
+    return result;
+#endif
+}
+
+/*
+ * @param data           Buffer to read bytes from
+ * @param isLittleEndian Output parameter
+ *                       Indicates if the data is little endian
+ *                       Is unaffected on false returns
+ */
+static inline bool is_valid_endian_marker(const uint8_t* data, bool* isLittleEndian) {
+    // II indicates Intel (little endian) and MM indicates motorola (big endian).
+    if (('I' != data[0] || 'I' != data[1]) && ('M' != data[0] || 'M' != data[1])) {
+        return false;
+    }
+
+    *isLittleEndian = ('I' == data[0]);
+    return true;
+}
+
+static inline uint16_t get_endian_short(const uint8_t* data, bool littleEndian) {
+    if (littleEndian) {
+        return (data[1] << 8) | (data[0]);
+    }
+
+    return (data[0] << 8) | (data[1]);
+}
+
+static inline uint32_t get_endian_int(const uint8_t* data, bool littleEndian) {
+    if (littleEndian) {
+        return (data[3] << 24) | (data[2] << 16) | (data[1] << 8) | (data[0]);
+    }
+
+    return (data[0] << 24) | (data[1] << 16) | (data[2] << 8) | (data[3]);
+}
+
+static inline SkPMColor premultiply_argb_as_rgba(U8CPU a, U8CPU r, U8CPU g, U8CPU b) {
+    if (a != 255) {
+        r = SkMulDiv255Round(r, a);
+        g = SkMulDiv255Round(g, a);
+        b = SkMulDiv255Round(b, a);
+    }
+
+    return SkPackARGB_as_RGBA(a, r, g, b);
+}
+
+static inline SkPMColor premultiply_argb_as_bgra(U8CPU a, U8CPU r, U8CPU g, U8CPU b) {
+    if (a != 255) {
+        r = SkMulDiv255Round(r, a);
+        g = SkMulDiv255Round(g, a);
+        b = SkMulDiv255Round(b, a);
+    }
+
+    return SkPackARGB_as_BGRA(a, r, g, b);
+}
+
+static inline bool is_rgba(SkColorType colorType) {
+#ifdef SK_PMCOLOR_IS_RGBA
+    return (kBGRA_8888_SkColorType != colorType);
+#else
+    return (kRGBA_8888_SkColorType == colorType);
+#endif
+}
+
+// Method for coverting to a 32 bit pixel.
+typedef uint32_t (*PackColorProc)(U8CPU a, U8CPU r, U8CPU g, U8CPU b);
+
+static inline PackColorProc choose_pack_color_proc(bool isPremul, SkColorType colorType) {
+    bool isRGBA = is_rgba(colorType);
+    if (isPremul) {
+        if (isRGBA) {
+            return &premultiply_argb_as_rgba;
+        } else {
+            return &premultiply_argb_as_bgra;
+        }
+    } else {
+        if (isRGBA) {
+            return &SkPackARGB_as_RGBA;
+        } else {
+            return &SkPackARGB_as_BGRA;
+        }
+    }
+}
+
+bool is_orientation_marker(const uint8_t* data, size_t data_length, SkEncodedOrigin* orientation);
+
+#endif // SkCodecPriv_DEFINED