Choosing Between Cairo Toy Text API and Pango for Text Rendering
Guide to decide whether to use Cairo's built‑in toy text API or integrate Pango for UTF‑8, bidirectional text and shaping in a Cairo‑based application.
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Developer tools · #cairo
How to measure Cairo rendering performance in Rust applications?
What measurement techniques and tools can be used to diagnose performance bottlenecks when rendering with Cairo via its Rust bindings? Please outline the steps for collecting timings, enabling debug features, and interpreting results.
assert_true failed in Cairo: Revert propagation ambiguity
assert_true failed in Cairo: Revert propagation ambiguity The assert_true macro in Cairo produces a runtime failure when its condition evaluates to false, typically reported as an "assert_true failed" error. When the condition is a function call that may revert, the language reference does not specify whether the revert is propagated to the caller or suppres
Cairo-VM ↔ Starknet Runtime: Interoperability Question on Transaction Timeouts
The goal is to enable a transaction to be gracefully aborted or bounded when execution time exceeds a safe limit. In Starknet, the Cairo‑VM enforces a gas‑based metering system, but gas limits are not a direct proxy for wall‑clock time. Moreover, once a transaction is included in a block, cancellation is only possible by failing the gas check, which is a har
Cairo-VM Proof Generation Memory Limits
STARK Proof Generation Resource Constraints The Cairo-VM execution model separates the initial trace generation from the subsequent STARK proving phase. While the VM execution phase follows a linear memory model, the proving phase translates these computations into algebraic constraints for cryptographic verification. Because proof generation is computationa
cairo: surface write-to-png fails - cairo_save does not roll back surface schema changes
Goal Decide whether cairo should automatically revert surface-level schema changes after cairo_save/restore, or leave surface state management to the caller. Constraints In cairo 1.18 and later, cairo_save and cairo_restore protect the graphics state but do not undo surface format or device-surface modifications. A subsequent cairo_surface_write_to_png may t
STARK proof generation failure in Cairo VM execution
Cairo VM Constraint Violation Outcome The Cairo VM compiles programs into arithmetic constraints; unsatisfied constraints prevent STARK proof generation, halting state transitions. Recovery Uncertainty State recovery depends on the underlying ledger's block‑height revert, as the VM lacks native checkpointing for granular rollback. This creates ambiguity when
Concurrent Cairo Transactions: Storage Write Batching vs Memory Caching Trade-offs
Assuming a recent Cairo compiler and StarkNet sequencer version, storage access to the same key under concurrent requests introduces latency that is absent in single-request execution because StarkNet orders transactions sequentially. The language specification does not define isolation levels for concurrent transactions, leaving unclear whether competing st
Can a finished cairo surface be recovered without destroying it?
Goal: determine whether a cairo surface in CAIRO_STATUS_SURFACE_FINISHED or another sticky error state can be reset and reused without destroying and recreating the surface object. cairo_surface_status exposes the stored status, and documentation treats some error codes as sticky, but it does not clearly promise that every API entry point preserves that stat