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// Copyright 2017 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/fxge/dib/cfx_imagerenderer.h"
#include <memory>
#include "core/fxge/cfx_cliprgn.h"
#include "core/fxge/dib/cfx_imagestretcher.h"
#include "core/fxge/dib/cfx_imagetransformer.h"
#include "third_party/base/ptr_util.h"
CFX_ImageRenderer::CFX_ImageRenderer(const RetainPtr<CFX_DIBitmap>& pDevice,
const CFX_ClipRgn* pClipRgn,
const RetainPtr<CFX_DIBSource>& pSource,
int bitmap_alpha,
uint32_t mask_color,
const CFX_Matrix* pMatrix,
uint32_t dib_flags,
bool bRgbByteOrder)
: m_pDevice(pDevice),
m_pClipRgn(pClipRgn),
m_Matrix(*pMatrix),
m_BitmapAlpha(bitmap_alpha),
m_BlendType(FXDIB_BLEND_NORMAL),
m_bRgbByteOrder(bRgbByteOrder),
m_MaskColor(mask_color),
m_Status(0),
m_AlphaFlag(0) {
FX_RECT image_rect = m_Matrix.GetUnitRect().GetOuterRect();
m_ClipBox = pClipRgn ? pClipRgn->GetBox() : FX_RECT(0, 0, pDevice->GetWidth(),
pDevice->GetHeight());
m_ClipBox.Intersect(image_rect);
if (m_ClipBox.IsEmpty())
return;
if ((fabs(m_Matrix.b) >= 0.5f || m_Matrix.a == 0) ||
(fabs(m_Matrix.c) >= 0.5f || m_Matrix.d == 0)) {
if (fabs(m_Matrix.a) < fabs(m_Matrix.b) / 20 &&
fabs(m_Matrix.d) < fabs(m_Matrix.c) / 20 && fabs(m_Matrix.a) < 0.5f &&
fabs(m_Matrix.d) < 0.5f) {
int dest_width = image_rect.Width();
int dest_height = image_rect.Height();
FX_RECT bitmap_clip = m_ClipBox;
bitmap_clip.Offset(-image_rect.left, -image_rect.top);
bitmap_clip = FXDIB_SwapClipBox(bitmap_clip, dest_width, dest_height,
m_Matrix.c > 0, m_Matrix.b < 0);
m_Composer.Compose(pDevice, pClipRgn, bitmap_alpha, mask_color, m_ClipBox,
true, m_Matrix.c > 0, m_Matrix.b < 0, m_bRgbByteOrder,
0, m_BlendType);
m_Stretcher = pdfium::MakeUnique<CFX_ImageStretcher>(
&m_Composer, pSource, dest_height, dest_width, bitmap_clip,
dib_flags);
if (m_Stretcher->Start())
m_Status = 1;
return;
}
m_Status = 2;
m_pTransformer = pdfium::MakeUnique<CFX_ImageTransformer>(
pSource, &m_Matrix, dib_flags, &m_ClipBox);
return;
}
int dest_width = image_rect.Width();
if (m_Matrix.a < 0)
dest_width = -dest_width;
int dest_height = image_rect.Height();
if (m_Matrix.d > 0)
dest_height = -dest_height;
if (dest_width == 0 || dest_height == 0)
return;
FX_RECT bitmap_clip = m_ClipBox;
bitmap_clip.Offset(-image_rect.left, -image_rect.top);
m_Composer.Compose(pDevice, pClipRgn, bitmap_alpha, mask_color, m_ClipBox,
false, false, false, m_bRgbByteOrder, 0, m_BlendType);
m_Status = 1;
m_Stretcher = pdfium::MakeUnique<CFX_ImageStretcher>(
&m_Composer, pSource, dest_width, dest_height, bitmap_clip, dib_flags);
m_Stretcher->Start();
}
CFX_ImageRenderer::~CFX_ImageRenderer() {}
bool CFX_ImageRenderer::Continue(IFX_PauseIndicator* pPause) {
if (m_Status == 1)
return m_Stretcher->Continue(pPause);
if (m_Status != 2)
return false;
if (m_pTransformer->Continue(pPause))
return true;
RetainPtr<CFX_DIBitmap> pBitmap = m_pTransformer->DetachBitmap();
if (!pBitmap || !pBitmap->GetBuffer())
return false;
if (pBitmap->IsAlphaMask()) {
if (m_BitmapAlpha != 255) {
if (m_AlphaFlag >> 8) {
m_AlphaFlag = (((uint8_t)((m_AlphaFlag & 0xff) * m_BitmapAlpha / 255)) |
((m_AlphaFlag >> 8) << 8));
} else {
m_MaskColor = FXARGB_MUL_ALPHA(m_MaskColor, m_BitmapAlpha);
}
}
m_pDevice->CompositeMask(
m_pTransformer->result().left, m_pTransformer->result().top,
pBitmap->GetWidth(), pBitmap->GetHeight(), pBitmap, m_MaskColor, 0, 0,
m_BlendType, m_pClipRgn.Get(), m_bRgbByteOrder, m_AlphaFlag);
} else {
if (m_BitmapAlpha != 255)
pBitmap->MultiplyAlpha(m_BitmapAlpha);
m_pDevice->CompositeBitmap(
m_pTransformer->result().left, m_pTransformer->result().top,
pBitmap->GetWidth(), pBitmap->GetHeight(), pBitmap, 0, 0, m_BlendType,
m_pClipRgn.Get(), m_bRgbByteOrder);
}
return false;
}
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