Assume that a size of framebuffer is 160*160
We have a read-buffer and write-buffer.
In general: reading of pixels of any region-size and writing them into region-size that greater or equal to 160 should give us the same results (whole area of write-buffer should be filled by color of read-buffer). That is satisfied except we are using some big pixel-values (dstX1, dstY1) starting from 0x7ffffff.
I haven't found any restrictions in minimum/maximum values for parameters (dstX0, dstY0) and (dstX1, dstY1), they are integers so looks like they could be any valid integer.

Test shows that for big dest-region a draw performed incorrectly.
Correct blit of 160*160 region to dest (0xffffff, 0xffffff): read160_to0xffffff.png
Incorrect blit of 160*160 region to dest (0x7fffffff, 0x7fffffff): read160_to0x7fffffff.png
Incorrect blit of INT_MAX*INT_MAX region to dest (INT_MAX, INT_MAX): readIntMax_toIntMax.png

Created attachment 143314 [details]
read160_to0xffffff.png

Created attachment 143315 [details]
read160_to0x7fffffff.png

Created attachment 143316 [details]
readIntMax_toIntMax.png

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