Introducing HTML5, Second Edition. Bruce Lawson and Remy Sharp. New Riders. Eighth Street. Berkeley, CA / Introducing HTML5 Game Development · Read more Simply Scheme - 2nd Edition: Introducing Computer Science · Read more. Introducing HTML5, Second Edition Bruce Lawson and Remy Sharp New Riders Eighth Street Berkeley, CA / / (fax) Find.
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Could we make PDF a first-class web citizen , that is a file format that a web browser could independently display?
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It would take the PDF representation of a graphical element, and generate the canvas equivalent. While in theory using canvas sounds like a good idea, there are actually a number of problems that make it unsuitable for use as a PDF renderer.
The first problem is that all rendering commands are issued in the UI thread, meaning complex pages either freeze the browser, or require constant calls to setTimeout which slows down rendering.
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The second issue is that canvas is hardware accelerated, which makes some rendering operations faster, but also unreliable. The problem is that by shifting responsibility for drawing to hardware, it relies on drivers, which are sometimes buggy.
Because of this, the creator of the PDF renderer cannot guarantee it will render PDFs correctly, because much of the critical rendering code is outside of their control. Here is a PDF snippet that draws some text that has a gradient fill, where the text and fill have different transforms.
However, in canvas, text and its fill cannot have different transforms. So what happens when this is put to canvas? As pdf. In this case, it outputs nothing, just a blank space where the text should be. Below is the page in question, rendered correctly on the left, and by pdf.
Introducing HTML5 (2nd Edition)
Why do people use PDF as a file format? We think that a recently posted article on the PDF Association website put it very well:. The PDF model begins with at least one page, usually including some text or images.
The primary value proposition of PDF is that it looks the same everywhere. At PDFTron, the thought of shipping an unreliable renderer with a poor user experience is totally unacceptable, and something that we could not do.
Introducing HTML5, 2nd Edition
The answer is actually old, using the same method as that used by the most popular desktop viewers. This way it is completely controlled by the renderer, and so correct rendering can be guaranteed.
It provides the same extensive functionality as our desktop SDKs , because it is the same SDK, now available in the browser. Not relying on a server component for in-browser PDF viewing provides a number of substantial advantages, for developers, your end users and the bottom line. First, there is no need to set up a PDF server stack, so one substantial task is eliminated there.
Applications are easier to write, because complexities involved in spreading the PDF logic between client and server are eliminated.
Having all the code in one place makes programs easier to write, and easier to write without bugs. With server conversion, you need to keep a duplicate representation of the content, which may or may not be ready or need updating. I read the second edition, which is up-to-date as of some time , but it's notable that they talk about Chrome 12, when I'm writing this review in Chrome 16 already.
The book has quite a lot of code snippets, but it's not a programming manual. Other reviewers have complained about the amount of code. On the other hand, this book doesn't feel like a suitably detailed reference for heavy development.
And that's it's strength and weakness. If you'd like an easy to read, whirlwind tour of almost the latest web technologies and their associated gotchas, this book is great.
If you need more detailed, rigorous documentation, this is not the book you are looking for. EPUB The open industry format known for its reflowable content and usability on supported mobile devices.
This eBook requires no passwords or activation to read. We customize your eBook by discreetly watermarking it with your name, making it uniquely yours. More than ever, you need to get acquainted with the powerful new possibilities in web and application design. It concentrates on the practical—the problems HTML5 can solve for you right away.
Introducing HTML5: Video and Audio. Download the sample pages includes Chapter 4 and Index.HTML 5 cannot provide animation within web pages.
Retrieved 14 December These plugins are not standard. Retrieved 26 February This eBook requires no passwords or activation to read. However, in canvas, text and its fill cannot have different transforms. Recommends Microdata code examples     , spec chapter  , special attributes . But how would that be possible?
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