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// Copyright 2016 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#include "core/fpdfapi/render/cpdf_scaledrenderbuffer.h"
#include "core/fpdfapi/render/cpdf_devicebuffer.h"
#include "core/fpdfapi/render/cpdf_rendercontext.h"
#include "core/fxge/cfx_defaultrenderdevice.h"
#include "core/fxge/dib/cfx_dibitmap.h"
namespace {
constexpr size_t kImageSizeLimitBytes = 30 * 1024 * 1024;
} // namespace
CPDF_ScaledRenderBuffer::CPDF_ScaledRenderBuffer() = default;
CPDF_ScaledRenderBuffer::~CPDF_ScaledRenderBuffer() = default;
bool CPDF_ScaledRenderBuffer::Initialize(CPDF_RenderContext* pContext,
CFX_RenderDevice* pDevice,
const FX_RECT& rect,
const CPDF_PageObject* pObj,
const CPDF_RenderOptions* pOptions,
int max_dpi) {
m_pDevice = pDevice;
if (m_pDevice->GetDeviceCaps(FXDC_RENDER_CAPS) & FXRC_GET_BITS)
return true;
m_Rect = rect;
m_Matrix = CPDF_DeviceBuffer::CalculateMatrix(pDevice, rect, max_dpi,
/*scale=*/true);
m_pBitmapDevice = std::make_unique<CFX_DefaultRenderDevice>();
bool bIsAlpha =
!!(m_pDevice->GetDeviceCaps(FXDC_RENDER_CAPS) & FXRC_ALPHA_OUTPUT);
FXDIB_Format dibFormat = bIsAlpha ? FXDIB_Format::kArgb : FXDIB_Format::kRgb;
while (true) {
FX_RECT bitmap_rect =
m_Matrix.TransformRect(CFX_FloatRect(rect)).GetOuterRect();
int32_t width = bitmap_rect.Width();
int32_t height = bitmap_rect.Height();
// Set to 0 to make CalculatePitchAndSize() calculate it.
constexpr uint32_t kNoPitch = 0;
absl::optional<CFX_DIBitmap::PitchAndSize> pitch_size =
CFX_DIBitmap::CalculatePitchAndSize(width, height, dibFormat, kNoPitch);
if (!pitch_size.has_value())
return false;
if (pitch_size.value().size <= kImageSizeLimitBytes &&
m_pBitmapDevice->Create(width, height, dibFormat, nullptr)) {
break;
}
m_Matrix.Scale(0.5f, 0.5f);
}
pContext->GetBackground(m_pBitmapDevice->GetBitmap(), pObj, pOptions,
m_Matrix);
return true;
}
CFX_RenderDevice* CPDF_ScaledRenderBuffer::GetDevice() const {
return m_pBitmapDevice ? m_pBitmapDevice.get() : m_pDevice.Get();
}
void CPDF_ScaledRenderBuffer::OutputToDevice() {
if (m_pBitmapDevice) {
m_pDevice->StretchDIBits(m_pBitmapDevice->GetBitmap(), m_Rect.left,
m_Rect.top, m_Rect.Width(), m_Rect.Height());
}
}