Render by PDFKit on iOS by PandexLee · Pull Request #14 · SDWebImage/SDWebImagePDFCoder · GitHub

Summary by CodeRabbit

Refactor
- Enhanced the PDF rendering process to deliver more accurate page display and robust error handling, ensuring a clearer and more reliable viewing experience.
Chore
- Implemented internal configuration improvements to optimize compatibility and performance on Mac systems.

This update contributes to a smoother, more stable experience when viewing PDFs.

Walkthrough

This pull request introduces two main changes. A new IDEWorkspaceChecks.plist file has been added to the Xcode workspace in the SDWebImagePDFCoder project, which includes a key for indicating that a 32-bit Mac compatibility warning has been computed. Additionally, the createVectorPDFWithData:pageNumber: method in SDImagePDFCoder.m has been refactored to leverage PDFKit, replacing the earlier Core Graphics approach. This refactor includes creating a PDFDocument, validating the document and page bounds, and adjusting the drawing process.

Changes

File Path	Change Summary
SDWebImagePDFCoder.xcodeproj/.../IDEWorkspaceChecks.plist	Added a new XML plist file containing the key IDEDidComputeMac32BitWarning set to true to flag a computed 32-bit Mac warning.
SDWebImagePDFCoder/Classes/SDImagePDFCoder.m	Refactored createVectorPDFWithData:pageNumber: to use PDFKit. Replaced Core Graphics PDF handling with PDFDocument creation, enhanced page range checks, and updated drawing logic.

Sequence Diagram(s)

sequenceDiagram
    participant C as Client
    participant S as SDImagePDFCoder
    participant P as PDFKit

    C->>S: createVectorPDFWithData(data, pageNumber)
    S->>P: Initialize PDFDocument with data
    P-->>S: Return PDFDocument
    S->>S: Validate document & check page bounds
    alt Valid Page
        S->>P: Retrieve PDFPage for pageNumber
        P-->>S: Return PDFPage
        S->>S: Apply drawing transformation and render page
        S->>C: Return rendered image
    else Invalid Page
        S->>C: Return error/nil
    end

Poem

I hop into code with a skip and a cheer,
New plist files whisper changes that are clear.
PDF pages now twirl in a newfound light,
With PDFKit magic making rendering bright.
From my rabbit ears to each keystroke in flight,
I celebrate this update with playful delight!

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Actionable comments posted: 1

🧹 Nitpick comments (4)

SDWebImagePDFCoder/Classes/SDImagePDFCoder.m (4)

11-11: Ensure PDFKit availability on targeted platforms.
Make sure the deployment target for this project includes iOS 11+ (or the corresponding OS version that supports PDFKit). If older platforms must be supported, consider falling back to Core Graphics when PDFKit is unavailable.

155-157: Consider enhanced error handling or logging.
When PDFDocument initialization fails, returning nil might obscure the reason. Adding a warning log or custom error could help troubleshoot invalid PDF data.

160-163: Provide fallback or clear feedback on out-of-range pageNumber.
Currently, if pageNumber exceeds pageCount, the method returns nil. You could throw an exception, revert to the last page, or log a warning to let callers know they requested an invalid page index.

168-176: Evaluate bridging overhead and consistency.
You retrieve documentRef and pageRef from PDFDocument and PDFPage, which already provide high-level methods. If performance is critical, consider measuring the overhead of bridging to Core Graphics and see if sticking to PDFKit’s higher-level APIs (like [page drawWithBox:toContext:]) is sufficient.

📜 Review details

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 2aecb0a and 26d0a89.

📒 Files selected for processing (2)

SDWebImagePDFCoder.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist (1 hunks)
SDWebImagePDFCoder/Classes/SDImagePDFCoder.m (2 hunks)

🔇 Additional comments (2)

SDWebImagePDFCoder/Classes/SDImagePDFCoder.m (1)
178-181:
Details
❓ Verification inconclusive
Confirm the correct PDF bounding box.
Using kCGPDFMediaBox has broad coverage, but certain documents use kCGPDFCropBox or other boxes for visible content. Verify that kCGPDFMediaBox is always the intended display area.

🏁 Script executed:
#!/bin/bash
# Search the codebase for references to PDF bounding boxes to verify usage.
rg -A 3 "kCGPDF\w+Box"
Length of output: 722

Action Required: Confirm the intended display box

It appears that the code consistently uses kCGPDFMediaBox (as shown by the grep results) without any fallback or alternative for documents that might use another box (e.g., kCGPDFCropBox). Please verify that using kCGPDFMediaBox is indeed the intended display area for all supported PDFs. If there’s a chance that some documents rely on a different box for their visible content, consider whether additional handling or tests are needed.
SDWebImagePDFCoder.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist (1)
1-8: Plist addition acknowledged.
The new IDEWorkspaceChecks.plist with IDEDidComputeMac32BitWarning set to true is standard for Xcode workspace checks. No issues found here.

⚠️ Potential issue

Investigate the undefined targetRect.
SDGraphicsBeginImageContextWithOptions(targetRect.size, NO, 0); relies on targetRect, which is never declared or assigned before use. This likely causes undefined behavior or a compilation error.

Apply this diff to correct usage by substituting rect:

-    SDGraphicsBeginImageContextWithOptions(targetRect.size, NO, 0);
+    SDGraphicsBeginImageContextWithOptions(rect.size, NO, 0);

📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change

      
                SDGraphicsBeginImageContextWithOptions(targetRect.size, NO, 0);
          
                CGContextRef context = SDGraphicsGetCurrentContext();
          
            #if SD_UIKIT || SD_WATCH
          
                // Core Graphics coordinate system use the bottom-left, UIKit use the flipped one
          
                CGContextTranslateCTM(context, 0, rect.size.height);
          
                CGContextScaleCTM(context, 1, -1);
          
            #endif
          
                CGContextConcatCTM(context, transform);
          
                [page drawWithBox:kPDFDisplayBoxMediaBox toContext:context];
          
                image = SDGraphicsGetImageFromCurrentImageContext();
          
                SDGraphicsEndImageContext();
          
                SDGraphicsBeginImageContextWithOptions(rect.size, NO, 0);
          
                CGContextRef context = SDGraphicsGetCurrentContext();
          
            #if SD_UIKIT || SD_WATCH
          
                // Core Graphics coordinate system use the bottom-left, UIKit use the flipped one
          
                CGContextTranslateCTM(context, 0, rect.size.height);
          
                CGContextScaleCTM(context, 1, -1);
          
            #endif
          
                CGContextConcatCTM(context, transform);
          
                [page drawWithBox:kPDFDisplayBoxMediaBox toContext:context];
          
                image = SDGraphicsGetImageFromCurrentImageContext();
          
                SDGraphicsEndImageContext();

It's welcomed to see your PR!

This lib should support iOS 9+ (at least currently). But PDFKit needs iOS 11+

In the past 3 years, I already have a try for this and has a custom branch. If you can provide a fallback to use PDFKit on iOS 11+, and use CoreGraphics CGPDFContext on iOS 9, it's OK to merge now.

Or, maybe we still need to wait for some day when I decided to drop iOS 9 support.

PandexLee and others added 2 commits May 10, 2023 17:11

fix render pdf annotation

cc5822c

Merge branch 'SDWebImage:master' into render-by-PDFKit

26d0a89

coderabbitai Bot reviewed Mar 28, 2025

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Render by PDFKit on iOS by PandexLee · Pull Request #14 · SDWebImage/SDWebImagePDFCoder · GitHub

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Render by PDFKit on iOS - #14

Render by PDFKit on iOS#14
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Render by PDFKit on iOS by PandexLee · Pull Request #14 · SDWebImage/SDWebImagePDFCoder · GitHub

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Render by PDFKit on iOS - #14

Render by PDFKit on iOS#14PandexLee wants to merge 2 commits intoSDWebImage:masterSDWebImage/SDWebImagePDFCoder:masterfrom PandexLee:render-by-PDFKitPandexLee/SDWebImagePDFCoder:render-by-PDFKitCopy head branch name to clipboard

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Walkthrough

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Render by PDFKit on iOS#14
PandexLee wants to merge 2 commits into
SDWebImage:masterfrom
PandexLee:render-by-PDFKit

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