[pull] master from libvips:master

[pull]

See Commits and Changes for more details.

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Created by pull[bot] (v2.0.0-alpha.1)

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Summary by Sourcery

Introduce a buffer-based loader for PPM images and unify foreign build function implementations by returning parent class build results directly.

New Features:

• Add support for loading PPM images from memory buffers via vips_ppmload_buffer and VImage::ppmload_buffer

Enhancements:

• Streamline foreign build methods by directly delegating to parent class implementations across image formats

Documentation:

• Document the new ppmload_buffer operation in function-list.md and update C++ headers

Tests:

• Update PPM load tests to use the new buffer-based loading interface

[sourcery-ai]

Reviewer's Guide

This PR introduces a buffer-based PPM loader and refactors all foreign load/save classes to streamline their build methods by delegating directly to parent class build, along with updating C++ bindings, docs, and tests to support the new API.

Sequence Diagram for vips_ppmload_buffer Operation

sequenceDiagram
    actor ClientApp as "Client Application"
    participant C_API as "vips_ppmload_buffer()"
    participant CoreOp as "ppmload_buffer Operation Core"
    participant BufferLoader as "VipsForeignLoadPpmBuffer"
    participant ParentBuild as "VipsForeignLoadPpm.build()"
    participant VipsSourceLib as "VipsSource Library"

    ClientApp->>C_API: Call vips_ppmload_buffer(buffer_ptr, len, &out_image)
    C_API->>C_API: Create VipsBlob from buffer_ptr, len
    C_API->>CoreOp: vips_call_split("ppmload_buffer", blob, &out_image)
    CoreOp->>BufferLoader: vips_foreign_load_ppm_buffer_build(self)
    activate BufferLoader
    BufferLoader->>VipsSourceLib: vips_source_new_from_memory(blob_data, blob_length)
    VipsSourceLib-->>BufferLoader: new VipsSource
    BufferLoader->>ParentBuild: Call parent_class->build(self)
    activate ParentBuild
    ParentBuild-->>BufferLoader: build_result (image data read via VipsSource)
    deactivate ParentBuild
    BufferLoader-->>CoreOp: build_result
    deactivate BufferLoader
    CoreOp-->>C_API: result (image loaded)
    C_API->>C_API: vips_area_unref(VipsBlob)
    C_API-->>ClientApp: Return 0 (success) or -1 (error)

Loading

Class Diagram for New PPM Buffer Loading Functionality

classDiagram
    direction TB
    class VipsForeignLoadPpm {
        <<Base Class for PPM Loading>>
        # VipsSource* source
        # build(VipsObject* object) int
    }

    class VipsForeignLoadPpmBuffer {
        + VipsBlob* blob
        + vips_foreign_load_ppm_buffer_build(VipsObject* object) int
        + vips_foreign_load_ppm_is_a_buffer(const void* buf, size_t len) gboolean
        + vips_foreign_load_ppm_buffer_class_init(VipsForeignLoadPpmBufferClass* class) void
        + vips_foreign_load_ppm_buffer_init(VipsForeignLoadPpmBuffer* buffer) void
    }
    VipsForeignLoadPpm <|-- VipsForeignLoadPpmBuffer

    class VipsBlob {
      + void* data
      + size_t length
    }
    VipsForeignLoadPpmBuffer *-- "1" VipsBlob : "loads_from"

    class PublicAPI {
        <<API Entry Points>>
        + vips_ppmload_buffer(void* buf, size_t len, VipsImage** out, ...) int
        + VImage VImage::ppmload_buffer(VipsBlob* buffer, VOption* options)
    }
    PublicAPI ..> VipsForeignLoadPpmBuffer : invokes

Loading

File-Level Changes

Change	Details	Files
Add buffer-based PPM loader	Define VipsForeignLoadPpmBuffer type and build method Implement vips_ppmload_buffer and buffer detection Register new buffer operation in foreign init	libvips/foreign/ppmload.c libvips/foreign/foreign.c libvips/include/vips/foreign.h
Extend C++ API and documentation for ppmload_buffer	Add ppmload_buffer method to VImage8.h Implement VImage::ppmload_buffer in vips-operators.cpp Update function-list.md and ChangeLog entries	cplusplus/include/vips/VImage8.h cplusplus/vips-operators.cpp doc/function-list.md ChangeLog
Refactor build() methods across foreign modules	Replace manual if-error-return/return 0 with direct return of parent_class->build Apply to both load and save classes for all supported formats	libvips/foreign/heifload.c libvips/foreign/jp2kload.c libvips/foreign/jpegload.c libvips/foreign/webpload.c libvips/foreign/jxlload.c libvips/foreign/nsgifload.c libvips/foreign/tiffload.c libvips/foreign/fitsload.c libvips/foreign/matrixload.c libvips/foreign/niftiload.c libvips/foreign/pngload.c libvips/foreign/spngload.c libvips/foreign/csvload.c libvips/foreign/radload.c libvips/foreign/dzsave.c libvips/foreign/heifsave.c libvips/foreign/jp2ksave.c libvips/foreign/tiffsave.c libvips/foreign/vipsload.c libvips/foreign/vipssave.c libvips/foreign/webpsave.c libvips/foreign/jxlsave.c libvips/foreign/openslideload.c libvips/foreign/pngsave.c libvips/foreign/spngsave.c libvips/foreign/magick6load.c libvips/foreign/matrixsave.c libvips/foreign/pdfiumload.c libvips/foreign/popplerload.c
Update test suite for new buffer loader	Remove old ppmload_source test case Use Image.new_from_buffer for PPM memory input	test/test-suite/test_foreign.py

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