generatemip.inc

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Author : Stuart Morgan
Date : 2019-08-14 12:25:12
Hash : 9d737966
Message : Standardize copyright notices to project style For all "ANGLE Project" copyrights, standardize to the format specified by the style guide. Changes: - "Copyright (c)" and "Copyright(c)" changed to just "Copyright". - Removed the second half of date ranges ("Y1Y1-Y2Y2"->"Y1Y1"). - Fixed a small number of files that had no copyright date using the initial commit year from the version control history. - Fixed one instance of copyright being "The ANGLE Project" rather than "The ANGLE Project Authors" These changes are applied both to the copyright of source file, and where applicable to copyright statements that are generated by templates. BUG=angleproject:3811 Change-Id: I973dd65e4ef9deeba232d5be74c768256a0eb2e5 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1754397 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>
src/image_util/generatemip.inc
//
// Copyright 2015 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//

// generatemip.inc: Defines the GenerateMip function, templated on the format
// type of the image for which mip levels are being generated.

#include "common/mathutil.h"

#include "image_util/imageformats.h"

namespace angle
{

namespace priv
{

template <typename T>
static inline T *GetPixel(uint8_t *data, size_t x, size_t y, size_t z, size_t rowPitch, size_t depthPitch)
{
    return reinterpret_cast<T*>(data + (x * sizeof(T)) + (y * rowPitch) + (z * depthPitch));
}

template <typename T>
static inline const T *GetPixel(const uint8_t *data, size_t x, size_t y, size_t z, size_t rowPitch, size_t depthPitch)
{
    return reinterpret_cast<const T*>(data + (x * sizeof(T)) + (y * rowPitch) + (z * depthPitch));
}

template <typename T>
static void GenerateMip_Y(size_t sourceWidth, size_t sourceHeight, size_t sourceDepth,
                          const uint8_t *sourceData, size_t sourceRowPitch, size_t sourceDepthPitch,
                          size_t destWidth, size_t destHeight, size_t destDepth,
                          uint8_t *destData, size_t destRowPitch, size_t destDepthPitch)
{
    ASSERT(sourceWidth == 1);
    ASSERT(sourceHeight > 1);
    ASSERT(sourceDepth == 1);

    for (size_t y = 0; y < destHeight; y++)
    {
        const T *src0 = GetPixel<T>(sourceData, 0, y * 2, 0, sourceRowPitch, sourceDepthPitch);
        const T *src1 = GetPixel<T>(sourceData, 0, y * 2 + 1, 0, sourceRowPitch, sourceDepthPitch);
        T *dst = GetPixel<T>(destData, 0, y, 0, destRowPitch, destDepthPitch);

        T::average(dst, src0, src1);
    }
}

template <typename T>
static void GenerateMip_X(size_t sourceWidth, size_t sourceHeight, size_t sourceDepth,
                          const uint8_t *sourceData, size_t sourceRowPitch, size_t sourceDepthPitch,
                          size_t destWidth, size_t destHeight, size_t destDepth,
                          uint8_t *destData, size_t destRowPitch, size_t destDepthPitch)
{
    ASSERT(sourceWidth > 1);
    ASSERT(sourceHeight == 1);
    ASSERT(sourceDepth == 1);

    for (size_t x = 0; x < destWidth; x++)
    {
        const T *src0 = GetPixel<T>(sourceData, x * 2, 0, 0, sourceRowPitch, sourceDepthPitch);
        const T *src1 = GetPixel<T>(sourceData, x * 2 + 1, 0, 0, sourceRowPitch, sourceDepthPitch);
        T *dst = GetPixel<T>(destData, x, 0, 0, destRowPitch, destDepthPitch);

        T::average(dst, src0, src1);
    }
}

template <typename T>
static void GenerateMip_Z(size_t sourceWidth, size_t sourceHeight, size_t sourceDepth,
                          const uint8_t *sourceData, size_t sourceRowPitch, size_t sourceDepthPitch,
                          size_t destWidth, size_t destHeight, size_t destDepth,
                          uint8_t *destData, size_t destRowPitch, size_t destDepthPitch)
{
    ASSERT(sourceWidth == 1);
    ASSERT(sourceHeight == 1);
    ASSERT(sourceDepth > 1);

    for (size_t z = 0; z < destDepth; z++)
    {
        const T *src0 = GetPixel<T>(sourceData, 0, 0, z * 2, sourceRowPitch, sourceDepthPitch);
        const T *src1 = GetPixel<T>(sourceData, 0, 0, z * 2 + 1, sourceRowPitch, sourceDepthPitch);
        T *dst = GetPixel<T>(destData, 0, 0, z, destRowPitch, destDepthPitch);

        T::average(dst, src0, src1);
    }
}

template <typename T>
static void GenerateMip_XY(size_t sourceWidth, size_t sourceHeight, size_t sourceDepth,
                           const uint8_t *sourceData, size_t sourceRowPitch, size_t sourceDepthPitch,
                           size_t destWidth, size_t destHeight, size_t destDepth,
                           uint8_t *destData, size_t destRowPitch, size_t destDepthPitch)
{
    ASSERT(sourceWidth > 1);
    ASSERT(sourceHeight > 1);
    ASSERT(sourceDepth == 1);

    for (size_t y = 0; y < destHeight; y++)
    {
        for (size_t x = 0; x < destWidth; x++)
        {
            const T *src0 = GetPixel<T>(sourceData, x * 2, y * 2, 0, sourceRowPitch, sourceDepthPitch);
            const T *src1 = GetPixel<T>(sourceData, x * 2, y * 2 + 1, 0, sourceRowPitch, sourceDepthPitch);
            const T *src2 = GetPixel<T>(sourceData, x * 2 + 1, y * 2, 0, sourceRowPitch, sourceDepthPitch);
            const T *src3 = GetPixel<T>(sourceData, x * 2 + 1, y * 2 + 1, 0, sourceRowPitch, sourceDepthPitch);
            T *dst = GetPixel<T>(destData, x, y, 0, destRowPitch, destDepthPitch);

            T tmp0, tmp1;

            T::average(&tmp0, src0, src1);
            T::average(&tmp1, src2, src3);
            T::average(dst, &tmp0, &tmp1);
        }
    }
}

template <typename T>
static void GenerateMip_YZ(size_t sourceWidth, size_t sourceHeight, size_t sourceDepth,
                           const uint8_t *sourceData, size_t sourceRowPitch, size_t sourceDepthPitch,
                           size_t destWidth, size_t destHeight, size_t destDepth,
                           uint8_t *destData, size_t destRowPitch, size_t destDepthPitch)
{
    ASSERT(sourceWidth == 1);
    ASSERT(sourceHeight > 1);
    ASSERT(sourceDepth > 1);

    for (size_t z = 0; z < destDepth; z++)
    {
        for (size_t y = 0; y < destHeight; y++)
        {
            const T *src0 = GetPixel<T>(sourceData, 0, y * 2, z * 2, sourceRowPitch, sourceDepthPitch);
            const T *src1 = GetPixel<T>(sourceData, 0, y * 2, z * 2 + 1, sourceRowPitch, sourceDepthPitch);
            const T *src2 = GetPixel<T>(sourceData, 0, y * 2 + 1, z * 2, sourceRowPitch, sourceDepthPitch);
            const T *src3 = GetPixel<T>(sourceData, 0, y * 2 + 1, z * 2 + 1, sourceRowPitch, sourceDepthPitch);
            T *dst = GetPixel<T>(destData, 0, y, z, destRowPitch, destDepthPitch);

            T tmp0, tmp1;

            T::average(&tmp0, src0, src1);
            T::average(&tmp1, src2, src3);
            T::average(dst, &tmp0, &tmp1);
        }
    }
}

template <typename T>
static void GenerateMip_XZ(size_t sourceWidth, size_t sourceHeight, size_t sourceDepth,
                           const uint8_t *sourceData, size_t sourceRowPitch, size_t sourceDepthPitch,
                           size_t destWidth, size_t destHeight, size_t destDepth,
                           uint8_t *destData, size_t destRowPitch, size_t destDepthPitch)
{
    ASSERT(sourceWidth > 1);
    ASSERT(sourceHeight == 1);
    ASSERT(sourceDepth > 1);

    for (size_t z = 0; z < destDepth; z++)
    {
        for (size_t x = 0; x < destWidth; x++)
        {
            const T *src0 = GetPixel<T>(sourceData, x * 2, 0, z * 2, sourceRowPitch, sourceDepthPitch);
            const T *src1 = GetPixel<T>(sourceData, x * 2, 0, z * 2 + 1, sourceRowPitch, sourceDepthPitch);
            const T *src2 = GetPixel<T>(sourceData, x * 2 + 1, 0, z * 2, sourceRowPitch, sourceDepthPitch);
            const T *src3 = GetPixel<T>(sourceData, x * 2 + 1, 0, z * 2 + 1, sourceRowPitch, sourceDepthPitch);
            T *dst = GetPixel<T>(destData, x, 0, z, destRowPitch, destDepthPitch);

            T tmp0, tmp1;

            T::average(&tmp0, src0, src1);
            T::average(&tmp1, src2, src3);
            T::average(dst, &tmp0, &tmp1);
        }
    }
}

template <typename T>
static void GenerateMip_XYZ(size_t sourceWidth, size_t sourceHeight, size_t sourceDepth,
                            const uint8_t *sourceData, size_t sourceRowPitch, size_t sourceDepthPitch,
                            size_t destWidth, size_t destHeight, size_t destDepth,
                            uint8_t *destData, size_t destRowPitch, size_t destDepthPitch)
{
    ASSERT(sourceWidth > 1);
    ASSERT(sourceHeight > 1);
    ASSERT(sourceDepth > 1);

    for (size_t z = 0; z < destDepth; z++)
    {
        for (size_t y = 0; y < destHeight; y++)
        {
            for (size_t x = 0; x < destWidth; x++)
            {
                const T *src0 = GetPixel<T>(sourceData, x * 2, y * 2, z * 2, sourceRowPitch, sourceDepthPitch);
                const T *src1 = GetPixel<T>(sourceData, x * 2, y * 2, z * 2 + 1, sourceRowPitch, sourceDepthPitch);
                const T *src2 = GetPixel<T>(sourceData, x * 2, y * 2 + 1, z * 2, sourceRowPitch, sourceDepthPitch);
                const T *src3 = GetPixel<T>(sourceData, x * 2, y * 2 + 1, z * 2 + 1, sourceRowPitch, sourceDepthPitch);
                const T *src4 = GetPixel<T>(sourceData, x * 2 + 1, y * 2, z * 2, sourceRowPitch, sourceDepthPitch);
                const T *src5 = GetPixel<T>(sourceData, x * 2 + 1, y * 2, z * 2 + 1, sourceRowPitch, sourceDepthPitch);
                const T *src6 = GetPixel<T>(sourceData, x * 2 + 1, y * 2 + 1, z * 2, sourceRowPitch, sourceDepthPitch);
                const T *src7 = GetPixel<T>(sourceData, x * 2 + 1, y * 2 + 1, z * 2 + 1, sourceRowPitch, sourceDepthPitch);
                T *dst = GetPixel<T>(destData, x, y, z, destRowPitch, destDepthPitch);

                T tmp0, tmp1, tmp2, tmp3, tmp4, tmp5;

                T::average(&tmp0, src0, src1);
                T::average(&tmp1, src2, src3);
                T::average(&tmp2, src4, src5);
                T::average(&tmp3, src6, src7);

                T::average(&tmp4, &tmp0, &tmp1);
                T::average(&tmp5, &tmp2, &tmp3);

                T::average(dst, &tmp4, &tmp5);
            }
        }
    }
}


typedef void (*MipGenerationFunction)(size_t sourceWidth, size_t sourceHeight, size_t sourceDepth,
                                      const uint8_t *sourceData, size_t sourceRowPitch, size_t sourceDepthPitch,
                                      size_t destWidth, size_t destHeight, size_t destDepth,
                                      uint8_t *destData, size_t destRowPitch, size_t destDepthPitch);

template <typename T>
static MipGenerationFunction GetMipGenerationFunction(size_t sourceWidth, size_t sourceHeight, size_t sourceDepth)
{
    uint8_t index = ((sourceWidth > 1)  ? 1 : 0) |
                    ((sourceHeight > 1) ? 2 : 0) |
                    ((sourceDepth > 1)  ? 4 : 0);

    switch (index)
    {
      case 0: return nullptr;
      case 1: return GenerateMip_X<T>;   // W x 1 x 1
      case 2: return GenerateMip_Y<T>;   // 1 x H x 1
      case 3: return GenerateMip_XY<T>;  // W x H x 1
      case 4: return GenerateMip_Z<T>;   // 1 x 1 x D
      case 5: return GenerateMip_XZ<T>;  // W x 1 x D
      case 6: return GenerateMip_YZ<T>;  // 1 x H x D
      case 7: return GenerateMip_XYZ<T>; // W x H x D
    }

    UNREACHABLE();
    return nullptr;
}

}  // namespace priv

template <typename T>
inline void GenerateMip(size_t sourceWidth, size_t sourceHeight, size_t sourceDepth,
                        const uint8_t *sourceData, size_t sourceRowPitch, size_t sourceDepthPitch,
                        uint8_t *destData, size_t destRowPitch, size_t destDepthPitch)
{
    size_t mipWidth = std::max<size_t>(1, sourceWidth >> 1);
    size_t mipHeight = std::max<size_t>(1, sourceHeight >> 1);
    size_t mipDepth = std::max<size_t>(1, sourceDepth >> 1);

    priv::MipGenerationFunction generationFunction = priv::GetMipGenerationFunction<T>(sourceWidth, sourceHeight, sourceDepth);
    ASSERT(generationFunction != nullptr);

    generationFunction(sourceWidth, sourceHeight, sourceDepth, sourceData, sourceRowPitch, sourceDepthPitch,
                       mipWidth, mipHeight, mipDepth, destData, destRowPitch, destDepthPitch);
}

}  // namespace angle
kc3-lang/angle/src/image_util/generatemip.inc

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kc3-lang/angle /src/image_util/generatemip.inc
