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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_rendercontext.h"
#include "core/fpdfapi/render/cpdf_renderoptions.h"
#include "core/fxge/cfx_defaultrenderdevice.h"
#include "core/fxge/dib/cfx_dibitmap.h"
#include "third_party/base/ptr_util.h"
namespace {
constexpr size_t kImageSizeLimitBytes = 30 * 1024 * 1024;
} // namespace
CPDF_ScaledRenderBuffer::CPDF_ScaledRenderBuffer() {}
CPDF_ScaledRenderBuffer::~CPDF_ScaledRenderBuffer() {}
bool CPDF_ScaledRenderBuffer::Initialize(CPDF_RenderContext* pContext,
CFX_RenderDevice* pDevice,
const FX_RECT& pRect,
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_pContext = pContext;
m_Rect = pRect;
m_pObject = pObj;
m_Matrix.Translate(-pRect.left, -pRect.top);
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)
m_Matrix.Scale((float)(max_dpi) / dpih, 1.0f);
if (dpiv > max_dpi)
m_Matrix.Scale(1.0f, (float)(max_dpi) / (float)dpiv);
}
m_pBitmapDevice = pdfium::MakeUnique<CFX_DefaultRenderDevice>();
bool bIsAlpha =
!!(m_pDevice->GetDeviceCaps(FXDC_RENDER_CAPS) & FXRC_ALPHA_OUTPUT);
FXDIB_Format dibFormat = bIsAlpha ? FXDIB_Argb : FXDIB_Rgb;
while (1) {
FX_RECT bitmap_rect =
m_Matrix.TransformRect(CFX_FloatRect(pRect)).GetOuterRect();
int32_t width = bitmap_rect.Width();
int32_t height = bitmap_rect.Height();
// Set to 0 to make CalculatePitchAndSize() calculate it.
uint32_t pitch = 0;
uint32_t size;
if (!CFX_DIBitmap::CalculatePitchAndSize(width, height, dibFormat, &pitch,
&size)) {
return false;
}
if (size <= kImageSizeLimitBytes &&
m_pBitmapDevice->Create(width, height, dibFormat, nullptr)) {
break;
}
m_Matrix.Scale(0.5f, 0.5f);
}
m_pContext->GetBackground(m_pBitmapDevice->GetBitmap(), m_pObject.Get(),
pOptions, &m_Matrix);
return true;
}
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());
}
}
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