chromium/third_party/pdfium/core/fxge/skia/cfx_dibbase_skia.cpp

// Copyright 2023 The PDFium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "core/fxge/dib/cfx_dibbase.h"

#include <stddef.h>
#include <stdint.h>

#include <memory>
#include <type_traits>
#include <utility>

#include "core/fxcrt/check_op.h"
#include "core/fxcrt/compiler_specific.h"
#include "core/fxcrt/fx_2d_size.h"
#include "core/fxcrt/fx_memory.h"
#include "core/fxcrt/fx_memory_wrappers.h"
#include "core/fxcrt/fx_safe_types.h"
#include "core/fxcrt/notreached.h"
#include "core/fxcrt/retain_ptr.h"
#include "core/fxcrt/span.h"
#include "core/fxge/calculate_pitch.h"
#include "core/fxge/dib/cfx_dibitmap.h"
#include "core/fxge/dib/fx_dib.h"
#include "third_party/skia/include/core/SkAlphaType.h"
#include "third_party/skia/include/core/SkColor.h"
#include "third_party/skia/include/core/SkColorPriv.h"
#include "third_party/skia/include/core/SkColorType.h"
#include "third_party/skia/include/core/SkImage.h"
#include "third_party/skia/include/core/SkImageInfo.h"
#include "third_party/skia/include/core/SkPixmap.h"
#include "third_party/skia/include/core/SkRefCnt.h"

namespace {

// Releases `CFX_DIBitmap` "leaked" by `CreateSkiaImageFromDib()`.
void ReleaseRetainedHeldBySkImage(const void* /*pixels*/,
                                  SkImages::ReleaseContext context) { … }

// Creates an `SkImage` from a `CFX_DIBBase`.
sk_sp<SkImage> CreateSkiaImageFromDib(const CFX_DIBBase* source,
                                      SkColorType color_type,
                                      SkAlphaType alpha_type) { … }

// Releases allocated memory "leaked" by `CreateSkiaImageFromTransformedDib()`.
void ReleaseAllocatedHeldBySkImage(const void* pixels,
                                   SkImages::ReleaseContext /*context*/) { … }

// Template defining traits of a pixel transform function.
template <size_t source_bits_per_pixel, typename PixelTransform>
class PixelTransformTraits;

PixelTransformTraits<1, PixelTransform>;

PixelTransformTraits<8, PixelTransform>;

PixelTransformTraits<24, PixelTransform>;

PixelTransformTraits<32, PixelTransform>;

void ValidateScanlineSize(pdfium::span<const uint8_t> scanline,
                          size_t min_row_bytes) { … }

// Creates an `SkImage` from a `CFX_DIBBase`, transforming the source pixels
// using `pixel_transform`.
//
// TODO(crbug.com/pdfium/2048): Consolidate with `CFX_DIBBase::ConvertBuffer()`.
template <size_t source_bits_per_pixel, typename PixelTransform>
sk_sp<SkImage> CreateSkiaImageFromTransformedDib(
    const CFX_DIBBase& source,
    SkColorType color_type,
    SkAlphaType alpha_type,
    PixelTransform&& pixel_transform) { … }

bool IsRGBColorGrayScale(uint32_t color) { … }

}  // namespace

sk_sp<SkImage> CFX_DIBBase::RealizeSkImage() const { … }