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// Copyright 2016 The PDFium Authors
// 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_devicebuffer.h"
#include "build/build_config.h"
#include "core/fpdfapi/page/cpdf_pageobject.h"
#include "core/fpdfapi/parser/cpdf_dictionary.h"
#include "core/fpdfapi/render/cpdf_rendercontext.h"
#include "core/fpdfapi/render/cpdf_renderoptions.h"
#include "core/fxge/cfx_defaultrenderdevice.h"
#include "core/fxge/cfx_renderdevice.h"
#include "core/fxge/dib/cfx_dibitmap.h"
#include "core/fxge/dib/fx_dib.h"
namespace {
#if BUILDFLAG(IS_APPLE)
constexpr bool kScaleDeviceBuffer = false;
#else
constexpr bool kScaleDeviceBuffer = true;
#endif
} // namespace
// static
CFX_Matrix CPDF_DeviceBuffer::CalculateMatrix(CFX_RenderDevice* pDevice,
const FX_RECT& rect,
int max_dpi,
bool scale) {
CFX_Matrix matrix;
matrix.Translate(-rect.left, -rect.top);
if (scale) {
int horz_size = pDevice->GetDeviceCaps(FXDC_HORZ_SIZE);
int vert_size = pDevice->GetDeviceCaps(FXDC_VERT_SIZE);
if (horz_size && vert_size && max_dpi) {
int dpih =
pDevice->GetDeviceCaps(FXDC_PIXEL_WIDTH) * 254 / (horz_size * 10);
int dpiv =
pDevice->GetDeviceCaps(FXDC_PIXEL_HEIGHT) * 254 / (vert_size * 10);
if (dpih > max_dpi)
matrix.Scale(static_cast<float>(max_dpi) / dpih, 1.0f);
if (dpiv > max_dpi)
matrix.Scale(1.0f, static_cast<float>(max_dpi) / dpiv);
}
}
return matrix;
}
CPDF_DeviceBuffer::CPDF_DeviceBuffer(CPDF_RenderContext* pContext,
CFX_RenderDevice* pDevice,
const FX_RECT& rect,
const CPDF_PageObject* pObj,
int max_dpi)
: m_pDevice(pDevice),
m_pContext(pContext),
m_pObject(pObj),
m_pBitmap(pdfium::MakeRetain<CFX_DIBitmap>()),
m_Rect(rect),
m_Matrix(CalculateMatrix(pDevice, rect, max_dpi, kScaleDeviceBuffer)) {}
CPDF_DeviceBuffer::~CPDF_DeviceBuffer() = default;
bool CPDF_DeviceBuffer::Initialize() {
FX_RECT bitmap_rect =
m_Matrix.TransformRect(CFX_FloatRect(m_Rect)).GetOuterRect();
return m_pBitmap->Create(bitmap_rect.Width(), bitmap_rect.Height(),
FXDIB_Format::kArgb);
}
void CPDF_DeviceBuffer::OutputToDevice() {
if (m_pDevice->GetDeviceCaps(FXDC_RENDER_CAPS) & FXRC_GET_BITS) {
if (m_Matrix.a == 1.0f && m_Matrix.d == 1.0f) {
m_pDevice->SetDIBits(m_pBitmap, m_Rect.left, m_Rect.top);
} else {
m_pDevice->StretchDIBits(m_pBitmap, m_Rect.left, m_Rect.top,
m_Rect.Width(), m_Rect.Height());
}
return;
}
auto pBuffer = pdfium::MakeRetain<CFX_DIBitmap>();
m_pDevice->CreateCompatibleBitmap(pBuffer, m_pBitmap->GetWidth(),
m_pBitmap->GetHeight());
m_pContext->GetBackground(m_pDevice, m_pObject, nullptr, m_Matrix);
pBuffer->CompositeBitmap(0, 0, pBuffer->GetWidth(), pBuffer->GetHeight(),
m_pBitmap, 0, 0, BlendMode::kNormal, nullptr, false);
m_pDevice->StretchDIBits(pBuffer, m_Rect.left, m_Rect.top, m_Rect.Width(),
m_Rect.Height());
}
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