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// Copyright 2020 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_rendertiling.h"
#include <limits>
#include <memory>
#include "core/fpdfapi/page/cpdf_form.h"
#include "core/fpdfapi/page/cpdf_pageimagecache.h"
#include "core/fpdfapi/page/cpdf_tilingpattern.h"
#include "core/fpdfapi/parser/cpdf_document.h"
#include "core/fpdfapi/render/cpdf_rendercontext.h"
#include "core/fpdfapi/render/cpdf_renderoptions.h"
#include "core/fpdfapi/render/cpdf_renderstatus.h"
#include "core/fxcrt/fx_safe_types.h"
#include "core/fxge/cfx_defaultrenderdevice.h"
namespace {
RetainPtr<CFX_DIBitmap> DrawPatternBitmap(
CPDF_Document* pDoc,
CPDF_PageImageCache* pCache,
CPDF_TilingPattern* pPattern,
CPDF_Form* pPatternForm,
const CFX_Matrix& mtObject2Device,
int width,
int height,
const CPDF_RenderOptions::Options& draw_options) {
auto pBitmap = pdfium::MakeRetain<CFX_DIBitmap>();
if (!pBitmap->Create(width, height,
pPattern->colored() ? FXDIB_Format::kArgb
: FXDIB_Format::k8bppMask)) {
return nullptr;
}
CFX_DefaultRenderDevice bitmap_device;
bitmap_device.AttachWithBackdropAndGroupKnockout(
pBitmap, /*pBackdropBitmap=*/nullptr, /*bGroupKnockout=*/true);
CFX_FloatRect cell_bbox =
pPattern->pattern_to_form().TransformRect(pPattern->bbox());
cell_bbox = mtObject2Device.TransformRect(cell_bbox);
CFX_FloatRect bitmap_rect(0.0f, 0.0f, width, height);
CFX_Matrix mtAdjust;
mtAdjust.MatchRect(bitmap_rect, cell_bbox);
CFX_Matrix mtPattern2Bitmap = mtObject2Device * mtAdjust;
CPDF_RenderOptions options;
if (!pPattern->colored())
options.SetColorMode(CPDF_RenderOptions::kAlpha);
options.GetOptions() = draw_options;
options.GetOptions().bForceHalftone = true;
CPDF_RenderContext context(pDoc, nullptr, pCache);
context.AppendLayer(pPatternForm, mtPattern2Bitmap);
context.Render(&bitmap_device, nullptr, &options, nullptr);
#if defined(_SKIA_SUPPORT_)
if (CFX_DefaultRenderDevice::SkiaIsDefaultRenderer())
pBitmap->UnPreMultiply();
#endif // defined(_SKIA_SUPPORT_)
return pBitmap;
}
} // namespace
// static
RetainPtr<CFX_DIBitmap> CPDF_RenderTiling::Draw(
CPDF_RenderStatus* pRenderStatus,
CPDF_PageObject* pPageObj,
CPDF_TilingPattern* pPattern,
CPDF_Form* pPatternForm,
const CFX_Matrix& mtObj2Device,
const FX_RECT& clip_box,
bool bStroke) {
const CFX_Matrix mtPattern2Device =
pPattern->pattern_to_form() * mtObj2Device;
CFX_FloatRect cell_bbox = mtPattern2Device.TransformRect(pPattern->bbox());
float ceil_height = std::ceil(cell_bbox.Height());
float ceil_width = std::ceil(cell_bbox.Width());
// Validate the float will fit into the int when the conversion is done.
if (!pdfium::base::IsValueInRangeForNumericType<int>(ceil_height) ||
!pdfium::base::IsValueInRangeForNumericType<int>(ceil_width)) {
return nullptr;
}
int width = static_cast<int>(ceil_width);
int height = static_cast<int>(ceil_height);
if (width <= 0)
width = 1;
if (height <= 0)
height = 1;
CFX_FloatRect clip_box_p =
mtPattern2Device.GetInverse().TransformRect(CFX_FloatRect(clip_box));
int min_col = static_cast<int>(
ceil((clip_box_p.left - pPattern->bbox().right) / pPattern->x_step()));
int max_col = static_cast<int>(
floor((clip_box_p.right - pPattern->bbox().left) / pPattern->x_step()));
int min_row = static_cast<int>(
ceil((clip_box_p.bottom - pPattern->bbox().top) / pPattern->y_step()));
int max_row = static_cast<int>(
floor((clip_box_p.top - pPattern->bbox().bottom) / pPattern->y_step()));
// Make sure we can fit the needed width * height into an int.
if (height > std::numeric_limits<int>::max() / width)
return nullptr;
CFX_RenderDevice* pDevice = pRenderStatus->GetRenderDevice();
CPDF_RenderContext* pContext = pRenderStatus->GetContext();
const CPDF_RenderOptions& options = pRenderStatus->GetRenderOptions();
if (width > clip_box.Width() || height > clip_box.Height() ||
width * height > clip_box.Width() * clip_box.Height()) {
std::unique_ptr<CPDF_GraphicStates> pStates;
if (!pPattern->colored())
pStates = CPDF_RenderStatus::CloneObjStates(pPageObj, bStroke);
RetainPtr<const CPDF_Dictionary> pFormResource =
pPatternForm->GetDict()->GetDictFor("Resources");
for (int col = min_col; col <= max_col; col++) {
for (int row = min_row; row <= max_row; row++) {
CFX_PointF original = mtPattern2Device.Transform(
CFX_PointF(col * pPattern->x_step(), row * pPattern->y_step()));
CFX_Matrix matrix = mtObj2Device;
matrix.Translate(original.x - mtPattern2Device.e,
original.y - mtPattern2Device.f);
CFX_RenderDevice::StateRestorer restorer2(pDevice);
CPDF_RenderStatus status(pContext, pDevice);
status.SetOptions(options);
status.SetTransparency(pPatternForm->GetTransparency());
status.SetFormResource(pFormResource);
status.SetDropObjects(pRenderStatus->GetDropObjects());
status.Initialize(pRenderStatus, pStates.get());
status.RenderObjectList(pPatternForm, matrix);
}
}
return nullptr;
}
bool bAligned =
pPattern->bbox().left == 0 && pPattern->bbox().bottom == 0 &&
pPattern->bbox().right == pPattern->x_step() &&
pPattern->bbox().top == pPattern->y_step() &&
(mtPattern2Device.IsScaled() || mtPattern2Device.Is90Rotated());
if (bAligned) {
int orig_x = FXSYS_roundf(mtPattern2Device.e);
int orig_y = FXSYS_roundf(mtPattern2Device.f);
min_col = (clip_box.left - orig_x) / width;
if (clip_box.left < orig_x)
min_col--;
max_col = (clip_box.right - orig_x) / width;
if (clip_box.right <= orig_x)
max_col--;
min_row = (clip_box.top - orig_y) / height;
if (clip_box.top < orig_y)
min_row--;
max_row = (clip_box.bottom - orig_y) / height;
if (clip_box.bottom <= orig_y)
max_row--;
}
float left_offset = cell_bbox.left - mtPattern2Device.e;
float top_offset = cell_bbox.bottom - mtPattern2Device.f;
RetainPtr<CFX_DIBitmap> pPatternBitmap;
if (width * height < 16) {
RetainPtr<CFX_DIBitmap> pEnlargedBitmap = DrawPatternBitmap(
pContext->GetDocument(), pContext->GetPageCache(), pPattern,
pPatternForm, mtObj2Device, 8, 8, options.GetOptions());
pPatternBitmap = pEnlargedBitmap->StretchTo(
width, height, FXDIB_ResampleOptions(), nullptr);
} else {
pPatternBitmap = DrawPatternBitmap(
pContext->GetDocument(), pContext->GetPageCache(), pPattern,
pPatternForm, mtObj2Device, width, height, options.GetOptions());
}
if (!pPatternBitmap)
return nullptr;
if (options.ColorModeIs(CPDF_RenderOptions::kGray))
pPatternBitmap->ConvertColorScale(0, 0xffffff);
FX_ARGB fill_argb = pRenderStatus->GetFillArgb(pPageObj);
int clip_width = clip_box.right - clip_box.left;
int clip_height = clip_box.bottom - clip_box.top;
auto pScreen = pdfium::MakeRetain<CFX_DIBitmap>();
if (!pScreen->Create(clip_width, clip_height, FXDIB_Format::kArgb))
return nullptr;
pdfium::span<const uint8_t> src_buf = pPatternBitmap->GetBuffer();
for (int col = min_col; col <= max_col; col++) {
for (int row = min_row; row <= max_row; row++) {
int start_x;
int start_y;
if (bAligned) {
start_x =
FXSYS_roundf(mtPattern2Device.e) + col * width - clip_box.left;
start_y =
FXSYS_roundf(mtPattern2Device.f) + row * height - clip_box.top;
} else {
CFX_PointF original = mtPattern2Device.Transform(
CFX_PointF(col * pPattern->x_step(), row * pPattern->y_step()));
FX_SAFE_INT32 safeStartX = FXSYS_roundf(original.x + left_offset);
FX_SAFE_INT32 safeStartY = FXSYS_roundf(original.y + top_offset);
safeStartX -= clip_box.left;
safeStartY -= clip_box.top;
if (!safeStartX.IsValid() || !safeStartY.IsValid())
return nullptr;
start_x = safeStartX.ValueOrDie();
start_y = safeStartY.ValueOrDie();
}
if (width == 1 && height == 1) {
if (start_x < 0 || start_x >= clip_box.Width() || start_y < 0 ||
start_y >= clip_box.Height()) {
continue;
}
uint32_t* dest_buf = reinterpret_cast<uint32_t*>(
pScreen->GetWritableScanline(start_y).subspan(start_x * 4).data());
if (pPattern->colored()) {
const auto* src_buf32 =
reinterpret_cast<const uint32_t*>(src_buf.data());
*dest_buf = *src_buf32;
} else {
*dest_buf = (*(src_buf.data()) << 24) | (fill_argb & 0xffffff);
}
} else {
if (pPattern->colored()) {
pScreen->CompositeBitmap(start_x, start_y, width, height,
pPatternBitmap, 0, 0, BlendMode::kNormal,
nullptr, false);
} else {
pScreen->CompositeMask(start_x, start_y, width, height,
pPatternBitmap, fill_argb, 0, 0,
BlendMode::kNormal, nullptr, false);
}
}
}
}
return pScreen;
}
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