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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "pdf/number_image_generator.h"
#include "base/logging.h"
#include "base/strings/string_util.h"
#include "pdf/draw_utils.h"
#include "pdf/instance.h"
namespace chrome_pdf {
const int kPageNumberSeparator = 0;
const int kPageNumberOriginX = 8;
const int kPageNumberOriginY = 4;
NumberImageGenerator::NumberImageGenerator(Instance* instance)
: instance_(instance),
device_scale_(1.0f) {
}
NumberImageGenerator::~NumberImageGenerator() {
}
void NumberImageGenerator::Configure(const pp::ImageData& number_background,
const std::vector<pp::ImageData>& number_images, float device_scale) {
number_background_ = number_background;
number_images_ = number_images;
device_scale_ = device_scale;
}
void NumberImageGenerator::GenerateImage(
int page_number, pp::ImageData* image) {
char buffer[12];
base::snprintf(buffer, sizeof(buffer), "%u", page_number);
int extra_width = 0;
DCHECK(number_images_.size() >= 10);
DCHECK(!number_background_.is_null());
for (size_t i = 1; i < strlen(buffer); ++i) {
int index = buffer[i] - '0';
extra_width += number_images_[index].size().width();
extra_width += static_cast<int>(kPageNumberSeparator * device_scale_);
}
*image = pp::ImageData(
instance_,
PP_IMAGEDATAFORMAT_BGRA_PREMUL,
pp::Size(number_background_.size().width() + extra_width,
number_background_.size().height()),
false);
int stretch_point = number_background_.size().width() / 2;
pp::Rect src_rc(0, 0, stretch_point, number_background_.size().height());
pp::Rect dest_rc(src_rc);
CopyImage(number_background_, src_rc, image, dest_rc, false);
src_rc.Offset(number_background_.size().width() - stretch_point, 0);
dest_rc.Offset(image->size().width() - stretch_point, 0);
CopyImage(number_background_, src_rc, image, dest_rc, false);
src_rc = pp::Rect(stretch_point, 0, 1, number_background_.size().height());
dest_rc = src_rc;
dest_rc.set_width(extra_width + 1);
CopyImage(number_background_, src_rc, image, dest_rc, true);
pp::Point origin(static_cast<int>(kPageNumberOriginX * device_scale_),
static_cast<int>(kPageNumberOriginY * device_scale_));
for (size_t i = 0; i < strlen(buffer); ++i) {
int index = buffer[i] - '0';
CopyImage(
number_images_[index],
pp::Rect(pp::Point(), number_images_[index].size()),
image, pp::Rect(origin, number_images_[index].size()), false);
origin += pp::Point(
number_images_[index].size().width() +
static_cast<int>(kPageNumberSeparator * device_scale_), 0);
}
}
} // namespace chrome_pdf
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