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4991ef2f9d
Also includes the fix for upstream issue #288 to avoid crashes on some older Win7 systems. Differential Revision: https://phabricator.services.mozilla.com/D7758 --HG-- rename : media/libjpeg/simd/jsimd_arm.c => media/libjpeg/simd/arm/jsimd.c rename : media/libjpeg/simd/jsimd_arm_neon.S => media/libjpeg/simd/arm/jsimd_neon.S rename : media/libjpeg/simd/jsimd_arm64.c => media/libjpeg/simd/arm64/jsimd.c rename : media/libjpeg/simd/jsimd_arm64_neon.S => media/libjpeg/simd/arm64/jsimd_neon.S rename : media/libjpeg/simd/jccolext-mmx.asm => media/libjpeg/simd/i386/jccolext-mmx.asm rename : media/libjpeg/simd/jccolext-sse2.asm => media/libjpeg/simd/i386/jccolext-sse2.asm rename : media/libjpeg/simd/jccolor-mmx.asm => media/libjpeg/simd/i386/jccolor-mmx.asm rename : media/libjpeg/simd/jccolor-sse2.asm => media/libjpeg/simd/i386/jccolor-sse2.asm rename : media/libjpeg/simd/jcgray-mmx.asm => media/libjpeg/simd/i386/jcgray-mmx.asm rename : media/libjpeg/simd/jcgray-sse2.asm => media/libjpeg/simd/i386/jcgray-sse2.asm rename : media/libjpeg/simd/jcgryext-mmx.asm => media/libjpeg/simd/i386/jcgryext-mmx.asm rename : media/libjpeg/simd/jcgryext-sse2.asm => media/libjpeg/simd/i386/jcgryext-sse2.asm rename : media/libjpeg/simd/jchuff-sse2.asm => media/libjpeg/simd/i386/jchuff-sse2.asm rename : media/libjpeg/simd/jcsample-mmx.asm => media/libjpeg/simd/i386/jcsample-mmx.asm rename : media/libjpeg/simd/jcsample-sse2.asm => media/libjpeg/simd/i386/jcsample-sse2.asm rename : media/libjpeg/simd/jdcolext-mmx.asm => media/libjpeg/simd/i386/jdcolext-mmx.asm rename : media/libjpeg/simd/jdcolext-sse2.asm => media/libjpeg/simd/i386/jdcolext-sse2.asm rename : media/libjpeg/simd/jdcolor-mmx.asm => media/libjpeg/simd/i386/jdcolor-mmx.asm rename : media/libjpeg/simd/jdcolor-sse2.asm => media/libjpeg/simd/i386/jdcolor-sse2.asm rename : media/libjpeg/simd/jdmerge-mmx.asm => media/libjpeg/simd/i386/jdmerge-mmx.asm rename : media/libjpeg/simd/jdmerge-sse2.asm => media/libjpeg/simd/i386/jdmerge-sse2.asm rename : media/libjpeg/simd/jdmrgext-mmx.asm => media/libjpeg/simd/i386/jdmrgext-mmx.asm rename : media/libjpeg/simd/jdmrgext-sse2.asm => media/libjpeg/simd/i386/jdmrgext-sse2.asm rename : media/libjpeg/simd/jdsample-mmx.asm => media/libjpeg/simd/i386/jdsample-mmx.asm rename : media/libjpeg/simd/jdsample-sse2.asm => media/libjpeg/simd/i386/jdsample-sse2.asm rename : media/libjpeg/simd/jfdctflt-3dn.asm => media/libjpeg/simd/i386/jfdctflt-3dn.asm rename : media/libjpeg/simd/jfdctflt-sse.asm => media/libjpeg/simd/i386/jfdctflt-sse.asm rename : media/libjpeg/simd/jfdctfst-mmx.asm => media/libjpeg/simd/i386/jfdctfst-mmx.asm rename : media/libjpeg/simd/jfdctfst-sse2.asm => media/libjpeg/simd/i386/jfdctfst-sse2.asm rename : media/libjpeg/simd/jfdctint-mmx.asm => media/libjpeg/simd/i386/jfdctint-mmx.asm rename : media/libjpeg/simd/jfdctint-sse2.asm => media/libjpeg/simd/i386/jfdctint-sse2.asm rename : media/libjpeg/simd/jidctflt-3dn.asm => media/libjpeg/simd/i386/jidctflt-3dn.asm rename : media/libjpeg/simd/jidctflt-sse.asm => media/libjpeg/simd/i386/jidctflt-sse.asm rename : media/libjpeg/simd/jidctflt-sse2.asm => media/libjpeg/simd/i386/jidctflt-sse2.asm rename : media/libjpeg/simd/jidctfst-mmx.asm => media/libjpeg/simd/i386/jidctfst-mmx.asm rename : media/libjpeg/simd/jidctfst-sse2.asm => media/libjpeg/simd/i386/jidctfst-sse2.asm rename : media/libjpeg/simd/jidctint-mmx.asm => media/libjpeg/simd/i386/jidctint-mmx.asm rename : media/libjpeg/simd/jidctint-sse2.asm => media/libjpeg/simd/i386/jidctint-sse2.asm rename : media/libjpeg/simd/jidctred-mmx.asm => media/libjpeg/simd/i386/jidctred-mmx.asm rename : media/libjpeg/simd/jidctred-sse2.asm => media/libjpeg/simd/i386/jidctred-sse2.asm rename : media/libjpeg/simd/jquant-3dn.asm => media/libjpeg/simd/i386/jquant-3dn.asm rename : media/libjpeg/simd/jquant-mmx.asm => media/libjpeg/simd/i386/jquant-mmx.asm rename : media/libjpeg/simd/jquant-sse.asm => media/libjpeg/simd/i386/jquant-sse.asm rename : media/libjpeg/simd/jquantf-sse2.asm => media/libjpeg/simd/i386/jquantf-sse2.asm rename : media/libjpeg/simd/jquanti-sse2.asm => media/libjpeg/simd/i386/jquanti-sse2.asm rename : media/libjpeg/simd/jsimd_i386.c => media/libjpeg/simd/i386/jsimd.c rename : media/libjpeg/simd/jsimdcpu.asm => media/libjpeg/simd/i386/jsimdcpu.asm rename : media/libjpeg/simd/jsimd_mips.c => media/libjpeg/simd/mips/jsimd.c rename : media/libjpeg/simd/jsimd_mips_dspr2.S => media/libjpeg/simd/mips/jsimd_dspr2.S rename : media/libjpeg/simd/jsimd_mips_dspr2_asm.h => media/libjpeg/simd/mips/jsimd_dspr2_asm.h rename : media/libjpeg/simd/jcolsamp.inc => media/libjpeg/simd/nasm/jcolsamp.inc rename : media/libjpeg/simd/jdct.inc => media/libjpeg/simd/nasm/jdct.inc rename : media/libjpeg/simd/jpeg_nbits_table.inc => media/libjpeg/simd/nasm/jpeg_nbits_table.inc rename : media/libjpeg/simd/jsimdcfg.inc => media/libjpeg/simd/nasm/jsimdcfg.inc rename : media/libjpeg/simd/jsimdext.inc => media/libjpeg/simd/nasm/jsimdext.inc rename : media/libjpeg/simd/jccolext-altivec.c => media/libjpeg/simd/powerpc/jccolext-altivec.c rename : media/libjpeg/simd/jccolor-altivec.c => media/libjpeg/simd/powerpc/jccolor-altivec.c rename : media/libjpeg/simd/jcgray-altivec.c => media/libjpeg/simd/powerpc/jcgray-altivec.c rename : media/libjpeg/simd/jcgryext-altivec.c => media/libjpeg/simd/powerpc/jcgryext-altivec.c rename : media/libjpeg/simd/jcsample-altivec.c => media/libjpeg/simd/powerpc/jcsample-altivec.c rename : media/libjpeg/simd/jcsample.h => media/libjpeg/simd/powerpc/jcsample.h rename : media/libjpeg/simd/jdcolext-altivec.c => media/libjpeg/simd/powerpc/jdcolext-altivec.c rename : media/libjpeg/simd/jdcolor-altivec.c => media/libjpeg/simd/powerpc/jdcolor-altivec.c rename : media/libjpeg/simd/jdmerge-altivec.c => media/libjpeg/simd/powerpc/jdmerge-altivec.c rename : media/libjpeg/simd/jdmrgext-altivec.c => media/libjpeg/simd/powerpc/jdmrgext-altivec.c rename : media/libjpeg/simd/jdsample-altivec.c => media/libjpeg/simd/powerpc/jdsample-altivec.c rename : media/libjpeg/simd/jfdctfst-altivec.c => media/libjpeg/simd/powerpc/jfdctfst-altivec.c rename : media/libjpeg/simd/jfdctint-altivec.c => media/libjpeg/simd/powerpc/jfdctint-altivec.c rename : media/libjpeg/simd/jidctfst-altivec.c => media/libjpeg/simd/powerpc/jidctfst-altivec.c rename : media/libjpeg/simd/jidctint-altivec.c => media/libjpeg/simd/powerpc/jidctint-altivec.c rename : media/libjpeg/simd/jquanti-altivec.c => media/libjpeg/simd/powerpc/jquanti-altivec.c rename : media/libjpeg/simd/jsimd_powerpc.c => media/libjpeg/simd/powerpc/jsimd.c rename : media/libjpeg/simd/jsimd_altivec.h => media/libjpeg/simd/powerpc/jsimd_altivec.h rename : media/libjpeg/simd/jccolext-sse2-64.asm => media/libjpeg/simd/x86_64/jccolext-sse2.asm rename : media/libjpeg/simd/jccolor-sse2-64.asm => media/libjpeg/simd/x86_64/jccolor-sse2.asm rename : media/libjpeg/simd/jcgray-sse2-64.asm => media/libjpeg/simd/x86_64/jcgray-sse2.asm rename : media/libjpeg/simd/jcgryext-sse2-64.asm => media/libjpeg/simd/x86_64/jcgryext-sse2.asm rename : media/libjpeg/simd/jchuff-sse2-64.asm => media/libjpeg/simd/x86_64/jchuff-sse2.asm rename : media/libjpeg/simd/jcsample-sse2-64.asm => media/libjpeg/simd/x86_64/jcsample-sse2.asm rename : media/libjpeg/simd/jdcolext-sse2-64.asm => media/libjpeg/simd/x86_64/jdcolext-sse2.asm rename : media/libjpeg/simd/jdcolor-sse2-64.asm => media/libjpeg/simd/x86_64/jdcolor-sse2.asm rename : media/libjpeg/simd/jdmerge-sse2-64.asm => media/libjpeg/simd/x86_64/jdmerge-sse2.asm rename : media/libjpeg/simd/jdmrgext-sse2-64.asm => media/libjpeg/simd/x86_64/jdmrgext-sse2.asm rename : media/libjpeg/simd/jdsample-sse2-64.asm => media/libjpeg/simd/x86_64/jdsample-sse2.asm rename : media/libjpeg/simd/jfdctflt-sse-64.asm => media/libjpeg/simd/x86_64/jfdctflt-sse.asm rename : media/libjpeg/simd/jfdctfst-sse2-64.asm => media/libjpeg/simd/x86_64/jfdctfst-sse2.asm rename : media/libjpeg/simd/jfdctint-sse2-64.asm => media/libjpeg/simd/x86_64/jfdctint-sse2.asm rename : media/libjpeg/simd/jidctflt-sse2-64.asm => media/libjpeg/simd/x86_64/jidctflt-sse2.asm rename : media/libjpeg/simd/jidctfst-sse2-64.asm => media/libjpeg/simd/x86_64/jidctfst-sse2.asm rename : media/libjpeg/simd/jidctint-sse2-64.asm => media/libjpeg/simd/x86_64/jidctint-sse2.asm rename : media/libjpeg/simd/jidctred-sse2-64.asm => media/libjpeg/simd/x86_64/jidctred-sse2.asm rename : media/libjpeg/simd/jquantf-sse2-64.asm => media/libjpeg/simd/x86_64/jquantf-sse2.asm rename : media/libjpeg/simd/jquanti-sse2-64.asm => media/libjpeg/simd/x86_64/jquanti-sse2.asm rename : media/libjpeg/simd/jsimd_x86_64.c => media/libjpeg/simd/x86_64/jsimd.c extra : moz-landing-system : lando
461 lines
19 KiB
C
461 lines
19 KiB
C
/*
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* jdmainct.c
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*
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* This file was part of the Independent JPEG Group's software:
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* Copyright (C) 1994-1996, Thomas G. Lane.
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* libjpeg-turbo Modifications:
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* Copyright (C) 2010, 2016, D. R. Commander.
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* For conditions of distribution and use, see the accompanying README.ijg
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* file.
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*
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* This file contains the main buffer controller for decompression.
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* The main buffer lies between the JPEG decompressor proper and the
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* post-processor; it holds downsampled data in the JPEG colorspace.
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*
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* Note that this code is bypassed in raw-data mode, since the application
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* supplies the equivalent of the main buffer in that case.
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*/
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#include "jinclude.h"
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#include "jdmainct.h"
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/*
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* In the current system design, the main buffer need never be a full-image
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* buffer; any full-height buffers will be found inside the coefficient or
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* postprocessing controllers. Nonetheless, the main controller is not
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* trivial. Its responsibility is to provide context rows for upsampling/
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* rescaling, and doing this in an efficient fashion is a bit tricky.
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*
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* Postprocessor input data is counted in "row groups". A row group
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* is defined to be (v_samp_factor * DCT_scaled_size / min_DCT_scaled_size)
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* sample rows of each component. (We require DCT_scaled_size values to be
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* chosen such that these numbers are integers. In practice DCT_scaled_size
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* values will likely be powers of two, so we actually have the stronger
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* condition that DCT_scaled_size / min_DCT_scaled_size is an integer.)
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* Upsampling will typically produce max_v_samp_factor pixel rows from each
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* row group (times any additional scale factor that the upsampler is
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* applying).
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*
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* The coefficient controller will deliver data to us one iMCU row at a time;
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* each iMCU row contains v_samp_factor * DCT_scaled_size sample rows, or
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* exactly min_DCT_scaled_size row groups. (This amount of data corresponds
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* to one row of MCUs when the image is fully interleaved.) Note that the
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* number of sample rows varies across components, but the number of row
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* groups does not. Some garbage sample rows may be included in the last iMCU
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* row at the bottom of the image.
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*
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* Depending on the vertical scaling algorithm used, the upsampler may need
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* access to the sample row(s) above and below its current input row group.
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* The upsampler is required to set need_context_rows TRUE at global selection
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* time if so. When need_context_rows is FALSE, this controller can simply
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* obtain one iMCU row at a time from the coefficient controller and dole it
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* out as row groups to the postprocessor.
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*
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* When need_context_rows is TRUE, this controller guarantees that the buffer
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* passed to postprocessing contains at least one row group's worth of samples
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* above and below the row group(s) being processed. Note that the context
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* rows "above" the first passed row group appear at negative row offsets in
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* the passed buffer. At the top and bottom of the image, the required
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* context rows are manufactured by duplicating the first or last real sample
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* row; this avoids having special cases in the upsampling inner loops.
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*
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* The amount of context is fixed at one row group just because that's a
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* convenient number for this controller to work with. The existing
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* upsamplers really only need one sample row of context. An upsampler
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* supporting arbitrary output rescaling might wish for more than one row
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* group of context when shrinking the image; tough, we don't handle that.
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* (This is justified by the assumption that downsizing will be handled mostly
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* by adjusting the DCT_scaled_size values, so that the actual scale factor at
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* the upsample step needn't be much less than one.)
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*
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* To provide the desired context, we have to retain the last two row groups
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* of one iMCU row while reading in the next iMCU row. (The last row group
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* can't be processed until we have another row group for its below-context,
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* and so we have to save the next-to-last group too for its above-context.)
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* We could do this most simply by copying data around in our buffer, but
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* that'd be very slow. We can avoid copying any data by creating a rather
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* strange pointer structure. Here's how it works. We allocate a workspace
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* consisting of M+2 row groups (where M = min_DCT_scaled_size is the number
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* of row groups per iMCU row). We create two sets of redundant pointers to
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* the workspace. Labeling the physical row groups 0 to M+1, the synthesized
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* pointer lists look like this:
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* M+1 M-1
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* master pointer --> 0 master pointer --> 0
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* 1 1
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* ... ...
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* M-3 M-3
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* M-2 M
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* M-1 M+1
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* M M-2
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* M+1 M-1
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* 0 0
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* We read alternate iMCU rows using each master pointer; thus the last two
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* row groups of the previous iMCU row remain un-overwritten in the workspace.
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* The pointer lists are set up so that the required context rows appear to
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* be adjacent to the proper places when we pass the pointer lists to the
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* upsampler.
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*
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* The above pictures describe the normal state of the pointer lists.
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* At top and bottom of the image, we diddle the pointer lists to duplicate
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* the first or last sample row as necessary (this is cheaper than copying
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* sample rows around).
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*
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* This scheme breaks down if M < 2, ie, min_DCT_scaled_size is 1. In that
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* situation each iMCU row provides only one row group so the buffering logic
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* must be different (eg, we must read two iMCU rows before we can emit the
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* first row group). For now, we simply do not support providing context
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* rows when min_DCT_scaled_size is 1. That combination seems unlikely to
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* be worth providing --- if someone wants a 1/8th-size preview, they probably
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* want it quick and dirty, so a context-free upsampler is sufficient.
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*/
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/* Forward declarations */
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METHODDEF(void) process_data_simple_main(j_decompress_ptr cinfo,
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JSAMPARRAY output_buf,
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JDIMENSION *out_row_ctr,
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JDIMENSION out_rows_avail);
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METHODDEF(void) process_data_context_main(j_decompress_ptr cinfo,
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JSAMPARRAY output_buf,
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JDIMENSION *out_row_ctr,
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JDIMENSION out_rows_avail);
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#ifdef QUANT_2PASS_SUPPORTED
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METHODDEF(void) process_data_crank_post(j_decompress_ptr cinfo,
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JSAMPARRAY output_buf,
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JDIMENSION *out_row_ctr,
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JDIMENSION out_rows_avail);
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#endif
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LOCAL(void)
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alloc_funny_pointers(j_decompress_ptr cinfo)
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/* Allocate space for the funny pointer lists.
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* This is done only once, not once per pass.
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*/
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{
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my_main_ptr main_ptr = (my_main_ptr)cinfo->main;
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int ci, rgroup;
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int M = cinfo->_min_DCT_scaled_size;
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jpeg_component_info *compptr;
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JSAMPARRAY xbuf;
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/* Get top-level space for component array pointers.
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* We alloc both arrays with one call to save a few cycles.
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*/
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main_ptr->xbuffer[0] = (JSAMPIMAGE)
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(*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
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cinfo->num_components * 2 * sizeof(JSAMPARRAY));
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main_ptr->xbuffer[1] = main_ptr->xbuffer[0] + cinfo->num_components;
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for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
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ci++, compptr++) {
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rgroup = (compptr->v_samp_factor * compptr->_DCT_scaled_size) /
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cinfo->_min_DCT_scaled_size; /* height of a row group of component */
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/* Get space for pointer lists --- M+4 row groups in each list.
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* We alloc both pointer lists with one call to save a few cycles.
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*/
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xbuf = (JSAMPARRAY)
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(*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
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2 * (rgroup * (M + 4)) * sizeof(JSAMPROW));
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xbuf += rgroup; /* want one row group at negative offsets */
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main_ptr->xbuffer[0][ci] = xbuf;
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xbuf += rgroup * (M + 4);
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main_ptr->xbuffer[1][ci] = xbuf;
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}
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}
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LOCAL(void)
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make_funny_pointers(j_decompress_ptr cinfo)
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/* Create the funny pointer lists discussed in the comments above.
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* The actual workspace is already allocated (in main_ptr->buffer),
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* and the space for the pointer lists is allocated too.
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* This routine just fills in the curiously ordered lists.
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* This will be repeated at the beginning of each pass.
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*/
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{
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my_main_ptr main_ptr = (my_main_ptr)cinfo->main;
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int ci, i, rgroup;
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int M = cinfo->_min_DCT_scaled_size;
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jpeg_component_info *compptr;
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JSAMPARRAY buf, xbuf0, xbuf1;
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for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
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ci++, compptr++) {
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rgroup = (compptr->v_samp_factor * compptr->_DCT_scaled_size) /
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cinfo->_min_DCT_scaled_size; /* height of a row group of component */
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xbuf0 = main_ptr->xbuffer[0][ci];
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xbuf1 = main_ptr->xbuffer[1][ci];
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/* First copy the workspace pointers as-is */
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buf = main_ptr->buffer[ci];
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for (i = 0; i < rgroup * (M + 2); i++) {
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xbuf0[i] = xbuf1[i] = buf[i];
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}
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/* In the second list, put the last four row groups in swapped order */
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for (i = 0; i < rgroup * 2; i++) {
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xbuf1[rgroup * (M - 2) + i] = buf[rgroup * M + i];
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xbuf1[rgroup * M + i] = buf[rgroup * (M - 2) + i];
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}
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/* The wraparound pointers at top and bottom will be filled later
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* (see set_wraparound_pointers, below). Initially we want the "above"
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* pointers to duplicate the first actual data line. This only needs
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* to happen in xbuffer[0].
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*/
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for (i = 0; i < rgroup; i++) {
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xbuf0[i - rgroup] = xbuf0[0];
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}
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}
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}
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LOCAL(void)
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set_bottom_pointers(j_decompress_ptr cinfo)
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/* Change the pointer lists to duplicate the last sample row at the bottom
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* of the image. whichptr indicates which xbuffer holds the final iMCU row.
|
|
* Also sets rowgroups_avail to indicate number of nondummy row groups in row.
|
|
*/
|
|
{
|
|
my_main_ptr main_ptr = (my_main_ptr)cinfo->main;
|
|
int ci, i, rgroup, iMCUheight, rows_left;
|
|
jpeg_component_info *compptr;
|
|
JSAMPARRAY xbuf;
|
|
|
|
for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
|
|
ci++, compptr++) {
|
|
/* Count sample rows in one iMCU row and in one row group */
|
|
iMCUheight = compptr->v_samp_factor * compptr->_DCT_scaled_size;
|
|
rgroup = iMCUheight / cinfo->_min_DCT_scaled_size;
|
|
/* Count nondummy sample rows remaining for this component */
|
|
rows_left = (int)(compptr->downsampled_height % (JDIMENSION)iMCUheight);
|
|
if (rows_left == 0) rows_left = iMCUheight;
|
|
/* Count nondummy row groups. Should get same answer for each component,
|
|
* so we need only do it once.
|
|
*/
|
|
if (ci == 0) {
|
|
main_ptr->rowgroups_avail = (JDIMENSION)((rows_left - 1) / rgroup + 1);
|
|
}
|
|
/* Duplicate the last real sample row rgroup*2 times; this pads out the
|
|
* last partial rowgroup and ensures at least one full rowgroup of context.
|
|
*/
|
|
xbuf = main_ptr->xbuffer[main_ptr->whichptr][ci];
|
|
for (i = 0; i < rgroup * 2; i++) {
|
|
xbuf[rows_left + i] = xbuf[rows_left - 1];
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Initialize for a processing pass.
|
|
*/
|
|
|
|
METHODDEF(void)
|
|
start_pass_main(j_decompress_ptr cinfo, J_BUF_MODE pass_mode)
|
|
{
|
|
my_main_ptr main_ptr = (my_main_ptr)cinfo->main;
|
|
|
|
switch (pass_mode) {
|
|
case JBUF_PASS_THRU:
|
|
if (cinfo->upsample->need_context_rows) {
|
|
main_ptr->pub.process_data = process_data_context_main;
|
|
make_funny_pointers(cinfo); /* Create the xbuffer[] lists */
|
|
main_ptr->whichptr = 0; /* Read first iMCU row into xbuffer[0] */
|
|
main_ptr->context_state = CTX_PREPARE_FOR_IMCU;
|
|
main_ptr->iMCU_row_ctr = 0;
|
|
} else {
|
|
/* Simple case with no context needed */
|
|
main_ptr->pub.process_data = process_data_simple_main;
|
|
}
|
|
main_ptr->buffer_full = FALSE; /* Mark buffer empty */
|
|
main_ptr->rowgroup_ctr = 0;
|
|
break;
|
|
#ifdef QUANT_2PASS_SUPPORTED
|
|
case JBUF_CRANK_DEST:
|
|
/* For last pass of 2-pass quantization, just crank the postprocessor */
|
|
main_ptr->pub.process_data = process_data_crank_post;
|
|
break;
|
|
#endif
|
|
default:
|
|
ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Process some data.
|
|
* This handles the simple case where no context is required.
|
|
*/
|
|
|
|
METHODDEF(void)
|
|
process_data_simple_main(j_decompress_ptr cinfo, JSAMPARRAY output_buf,
|
|
JDIMENSION *out_row_ctr, JDIMENSION out_rows_avail)
|
|
{
|
|
my_main_ptr main_ptr = (my_main_ptr)cinfo->main;
|
|
JDIMENSION rowgroups_avail;
|
|
|
|
/* Read input data if we haven't filled the main buffer yet */
|
|
if (!main_ptr->buffer_full) {
|
|
if (!(*cinfo->coef->decompress_data) (cinfo, main_ptr->buffer))
|
|
return; /* suspension forced, can do nothing more */
|
|
main_ptr->buffer_full = TRUE; /* OK, we have an iMCU row to work with */
|
|
}
|
|
|
|
/* There are always min_DCT_scaled_size row groups in an iMCU row. */
|
|
rowgroups_avail = (JDIMENSION)cinfo->_min_DCT_scaled_size;
|
|
/* Note: at the bottom of the image, we may pass extra garbage row groups
|
|
* to the postprocessor. The postprocessor has to check for bottom
|
|
* of image anyway (at row resolution), so no point in us doing it too.
|
|
*/
|
|
|
|
/* Feed the postprocessor */
|
|
(*cinfo->post->post_process_data) (cinfo, main_ptr->buffer,
|
|
&main_ptr->rowgroup_ctr, rowgroups_avail,
|
|
output_buf, out_row_ctr, out_rows_avail);
|
|
|
|
/* Has postprocessor consumed all the data yet? If so, mark buffer empty */
|
|
if (main_ptr->rowgroup_ctr >= rowgroups_avail) {
|
|
main_ptr->buffer_full = FALSE;
|
|
main_ptr->rowgroup_ctr = 0;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Process some data.
|
|
* This handles the case where context rows must be provided.
|
|
*/
|
|
|
|
METHODDEF(void)
|
|
process_data_context_main(j_decompress_ptr cinfo, JSAMPARRAY output_buf,
|
|
JDIMENSION *out_row_ctr, JDIMENSION out_rows_avail)
|
|
{
|
|
my_main_ptr main_ptr = (my_main_ptr)cinfo->main;
|
|
|
|
/* Read input data if we haven't filled the main buffer yet */
|
|
if (!main_ptr->buffer_full) {
|
|
if (!(*cinfo->coef->decompress_data) (cinfo,
|
|
main_ptr->xbuffer[main_ptr->whichptr]))
|
|
return; /* suspension forced, can do nothing more */
|
|
main_ptr->buffer_full = TRUE; /* OK, we have an iMCU row to work with */
|
|
main_ptr->iMCU_row_ctr++; /* count rows received */
|
|
}
|
|
|
|
/* Postprocessor typically will not swallow all the input data it is handed
|
|
* in one call (due to filling the output buffer first). Must be prepared
|
|
* to exit and restart. This switch lets us keep track of how far we got.
|
|
* Note that each case falls through to the next on successful completion.
|
|
*/
|
|
switch (main_ptr->context_state) {
|
|
case CTX_POSTPONED_ROW:
|
|
/* Call postprocessor using previously set pointers for postponed row */
|
|
(*cinfo->post->post_process_data) (cinfo,
|
|
main_ptr->xbuffer[main_ptr->whichptr],
|
|
&main_ptr->rowgroup_ctr,
|
|
main_ptr->rowgroups_avail, output_buf,
|
|
out_row_ctr, out_rows_avail);
|
|
if (main_ptr->rowgroup_ctr < main_ptr->rowgroups_avail)
|
|
return; /* Need to suspend */
|
|
main_ptr->context_state = CTX_PREPARE_FOR_IMCU;
|
|
if (*out_row_ctr >= out_rows_avail)
|
|
return; /* Postprocessor exactly filled output buf */
|
|
/*FALLTHROUGH*/
|
|
case CTX_PREPARE_FOR_IMCU:
|
|
/* Prepare to process first M-1 row groups of this iMCU row */
|
|
main_ptr->rowgroup_ctr = 0;
|
|
main_ptr->rowgroups_avail = (JDIMENSION)(cinfo->_min_DCT_scaled_size - 1);
|
|
/* Check for bottom of image: if so, tweak pointers to "duplicate"
|
|
* the last sample row, and adjust rowgroups_avail to ignore padding rows.
|
|
*/
|
|
if (main_ptr->iMCU_row_ctr == cinfo->total_iMCU_rows)
|
|
set_bottom_pointers(cinfo);
|
|
main_ptr->context_state = CTX_PROCESS_IMCU;
|
|
/*FALLTHROUGH*/
|
|
case CTX_PROCESS_IMCU:
|
|
/* Call postprocessor using previously set pointers */
|
|
(*cinfo->post->post_process_data) (cinfo,
|
|
main_ptr->xbuffer[main_ptr->whichptr],
|
|
&main_ptr->rowgroup_ctr,
|
|
main_ptr->rowgroups_avail, output_buf,
|
|
out_row_ctr, out_rows_avail);
|
|
if (main_ptr->rowgroup_ctr < main_ptr->rowgroups_avail)
|
|
return; /* Need to suspend */
|
|
/* After the first iMCU, change wraparound pointers to normal state */
|
|
if (main_ptr->iMCU_row_ctr == 1)
|
|
set_wraparound_pointers(cinfo);
|
|
/* Prepare to load new iMCU row using other xbuffer list */
|
|
main_ptr->whichptr ^= 1; /* 0=>1 or 1=>0 */
|
|
main_ptr->buffer_full = FALSE;
|
|
/* Still need to process last row group of this iMCU row, */
|
|
/* which is saved at index M+1 of the other xbuffer */
|
|
main_ptr->rowgroup_ctr = (JDIMENSION)(cinfo->_min_DCT_scaled_size + 1);
|
|
main_ptr->rowgroups_avail = (JDIMENSION)(cinfo->_min_DCT_scaled_size + 2);
|
|
main_ptr->context_state = CTX_POSTPONED_ROW;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Process some data.
|
|
* Final pass of two-pass quantization: just call the postprocessor.
|
|
* Source data will be the postprocessor controller's internal buffer.
|
|
*/
|
|
|
|
#ifdef QUANT_2PASS_SUPPORTED
|
|
|
|
METHODDEF(void)
|
|
process_data_crank_post(j_decompress_ptr cinfo, JSAMPARRAY output_buf,
|
|
JDIMENSION *out_row_ctr, JDIMENSION out_rows_avail)
|
|
{
|
|
(*cinfo->post->post_process_data) (cinfo, (JSAMPIMAGE)NULL,
|
|
(JDIMENSION *)NULL, (JDIMENSION)0,
|
|
output_buf, out_row_ctr, out_rows_avail);
|
|
}
|
|
|
|
#endif /* QUANT_2PASS_SUPPORTED */
|
|
|
|
|
|
/*
|
|
* Initialize main buffer controller.
|
|
*/
|
|
|
|
GLOBAL(void)
|
|
jinit_d_main_controller(j_decompress_ptr cinfo, boolean need_full_buffer)
|
|
{
|
|
my_main_ptr main_ptr;
|
|
int ci, rgroup, ngroups;
|
|
jpeg_component_info *compptr;
|
|
|
|
main_ptr = (my_main_ptr)
|
|
(*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
|
|
sizeof(my_main_controller));
|
|
cinfo->main = (struct jpeg_d_main_controller *)main_ptr;
|
|
main_ptr->pub.start_pass = start_pass_main;
|
|
|
|
if (need_full_buffer) /* shouldn't happen */
|
|
ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
|
|
|
|
/* Allocate the workspace.
|
|
* ngroups is the number of row groups we need.
|
|
*/
|
|
if (cinfo->upsample->need_context_rows) {
|
|
if (cinfo->_min_DCT_scaled_size < 2) /* unsupported, see comments above */
|
|
ERREXIT(cinfo, JERR_NOTIMPL);
|
|
alloc_funny_pointers(cinfo); /* Alloc space for xbuffer[] lists */
|
|
ngroups = cinfo->_min_DCT_scaled_size + 2;
|
|
} else {
|
|
ngroups = cinfo->_min_DCT_scaled_size;
|
|
}
|
|
|
|
for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
|
|
ci++, compptr++) {
|
|
rgroup = (compptr->v_samp_factor * compptr->_DCT_scaled_size) /
|
|
cinfo->_min_DCT_scaled_size; /* height of a row group of component */
|
|
main_ptr->buffer[ci] = (*cinfo->mem->alloc_sarray)
|
|
((j_common_ptr)cinfo, JPOOL_IMAGE,
|
|
compptr->width_in_blocks * compptr->_DCT_scaled_size,
|
|
(JDIMENSION)(rgroup * ngroups));
|
|
}
|
|
}
|