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/*************************************************************************** |
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* Copyright (c) 2024 Microsoft Corporation |
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* |
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* This program and the accompanying materials are made available under the |
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* terms of the MIT License which is available at |
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* https://opensource.org/licenses/MIT. |
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* |
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* SPDX-License-Identifier: MIT |
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**************************************************************************/ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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/** */ |
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/** GUIX Component */ |
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/** */ |
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/** Utility (Utility) */ |
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/** */ |
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/**************************************************************************/ |
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#define GX_SOURCE_CODE |
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/* Include necessary system files. */ |
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#include "gx_api.h" |
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#include "gx_utility.h" |
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#include "gx_system.h" |
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#define REDVAL_332(_c) (((_c) >> 5) & 0x07) |
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#define GREENVAL_332(_c) (((_c) >> 2) & 0x07) |
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#define BLUEVAL_332(_c) ((_c) & 0x03) |
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#define ASSEMBLECOLOR_332(_r, _g, _b) \ |
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((((_r) & 0x07) << 5) | \ |
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(((_g) & 0x07) << 2) | \ |
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((_b) & 0x03)) |
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/**************************************************************************/ |
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/* */ |
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/* FUNCTION RELEASE */ |
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/* */ |
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/* _gx_utility_8bpp_pixelmap_raw_resize PORTABLE C */ |
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/* 6.1.7 */ |
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/* AUTHOR */ |
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/* */ |
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/* Kenneth Maxwell, Microsoft Corporation */ |
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/* */ |
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/* DESCRIPTION */ |
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/* */ |
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/* Internal helper function that resize 8bpp format uncompressed */ |
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/* pixelmap with or without transparent channel. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* src The source pixelmap */ |
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/* destination The resized pixelmap to be */ |
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/* returned */ |
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/* width New width */ |
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/* height New height */ |
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/* */ |
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/* OUTPUT */ |
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/* */ |
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/* status Completion status */ |
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/* */ |
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/* CALLS */ |
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/* */ |
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/* _gx_system_memory_allocator Application defined memory */ |
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/* allocation function */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* GUIX Internal Code */ |
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/* */ |
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/* RELEASE HISTORY */ |
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/* */ |
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/* DATE NAME DESCRIPTION */ |
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/* */ |
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/* 05-19-2020 Kenneth Maxwell Initial Version 6.0 */ |
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/* 09-30-2020 Kenneth Maxwell Modified comment(s), */ |
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/* resulting in version 6.1 */ |
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/* 06-02-2021 Kenneth Maxwell Modified comment(s), */ |
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/* removed unused variable */ |
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/* assignment, */ |
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/* resulting in version 6.1.7 */ |
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/* */ |
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/**************************************************************************/ |
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static UINT _gx_utility_8bpp_pixelmap_raw_resize(GX_PIXELMAP *src, GX_PIXELMAP *destination, INT width, INT height) |
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{ |
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/* The pixelmap resize function is implemented from nearest neighbor |
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image scaling algorithm. */ |
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GX_UBYTE *get; |
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GX_UBYTE *put; |
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INT xradio; |
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INT yradio; |
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INT x; |
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INT y; |
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INT xx; |
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INT yy; |
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/* Calculate scale ratio and enlarge it by 256 times to keep precision. */ |
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xradio = ((src -> gx_pixelmap_width) << 8) / width; |
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yradio = ((src -> gx_pixelmap_height) << 8) / height; |
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/* Fill property values into destination pixelmap structure. */ |
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destination -> gx_pixelmap_flags = src -> gx_pixelmap_flags; |
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destination -> gx_pixelmap_format = src -> gx_pixelmap_format; |
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destination -> gx_pixelmap_transparent_color = src -> gx_pixelmap_transparent_color; |
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destination -> gx_pixelmap_version_major = src -> gx_pixelmap_version_major; |
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destination -> gx_pixelmap_version_minor = src -> gx_pixelmap_version_minor; |
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destination -> gx_pixelmap_height = (GX_VALUE)height; |
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destination -> gx_pixelmap_width = (GX_VALUE)width; |
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/* Safe int math is not required here, calling function limits max width, height to 14 bits so |
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overflow cannot occur. */ |
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destination -> gx_pixelmap_data_size = (UINT)(height * width) * sizeof(GX_UBYTE); |
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/* Allocate memory to load pixelmap data. */ |
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destination -> gx_pixelmap_data = (GX_UBYTE *)_gx_system_memory_allocator(destination -> gx_pixelmap_data_size); |
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✓✓ |
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if (destination -> gx_pixelmap_data == GX_NULL) |
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{ |
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return GX_SYSTEM_MEMORY_ERROR; |
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} |
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put = (GX_UBYTE *)destination -> gx_pixelmap_data; |
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/* Loop through destination's pixel and fill each pixel with the nearest neighbor. */ |
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✓✓ |
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for (y = 0; y < height; y++) |
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{ |
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✓✓ |
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for (x = 0; x < width; x++) |
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{ |
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xx = (xradio * x) >> 8; |
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yy = (yradio * y) >> 8; |
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get = (GX_UBYTE *)src -> gx_pixelmap_data; |
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get += yy * src -> gx_pixelmap_width; |
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get += xx; |
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*put++ = *get; |
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} |
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} |
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return GX_SUCCESS; |
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} |
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/**************************************************************************/ |
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/* */ |
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/* FUNCTION RELEASE */ |
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/* */ |
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/* _gx_utility_8bpp_pixelmap_alpha_resize PORTABLE C */ |
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/* 6.1.7 */ |
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/* AUTHOR */ |
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/* */ |
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/* Kenneth Maxwell, Microsoft Corporation */ |
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/* */ |
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/* DESCRIPTION */ |
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/* */ |
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/* Internal helper function that resize an 8bpp format uncompressed */ |
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/* pixelmap with transparent channel. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* src The source pixelmap */ |
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/* destination The resized pixelmap to be */ |
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/* returned */ |
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/* width New width */ |
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/* height New height */ |
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/* */ |
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/* OUTPUT */ |
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/* */ |
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/* status Completion status */ |
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/* */ |
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/* CALLS */ |
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/* */ |
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/* _gx_system_memory_allocator Application defined memory */ |
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/* allocation function */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* GUIX Internal Code */ |
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/* */ |
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/* RELEASE HISTORY */ |
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/* */ |
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/* DATE NAME DESCRIPTION */ |
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/* */ |
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/* 05-19-2020 Kenneth Maxwell Initial Version 6.0 */ |
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/* 09-30-2020 Kenneth Maxwell Modified comment(s), */ |
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/* resulting in version 6.1 */ |
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/* 06-02-2021 Kenneth Maxwell Modified comment(s), */ |
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/* removed unused variable */ |
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/* assignment, */ |
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/* resulting in version 6.1.7 */ |
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/* */ |
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/**************************************************************************/ |
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static UINT _gx_utility_8bpp_pixelmap_alpha_resize(GX_PIXELMAP *src, GX_PIXELMAP *destination, INT width, INT height) |
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{ |
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/* The pixelmap resize function is implemented from bilinear interpolation |
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image scaling algorithm. */ |
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GX_UBYTE *get; |
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GX_UBYTE *put; |
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GX_UBYTE *getalpha; |
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GX_UBYTE *putalpha; |
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INT xdiff; |
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INT ydiff; |
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INT xradio; |
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INT yradio; |
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INT x; |
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INT y; |
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INT xx; |
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INT yy; |
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GX_UBYTE neighbor_pixels[2][2]; |
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GX_COLOR alpha[4]; |
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GX_COLOR red; |
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GX_COLOR green; |
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GX_COLOR blue; |
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/* Calculate scale ratio and enlarge it by 256 times to keep precision. */ |
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xradio = ((src -> gx_pixelmap_width) << 8) / width; |
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yradio = ((src -> gx_pixelmap_height) << 8) / height; |
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/* Fill property values into destination pixelmap structure. */ |
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destination -> gx_pixelmap_flags = src -> gx_pixelmap_flags; |
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destination -> gx_pixelmap_format = src -> gx_pixelmap_format; |
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destination -> gx_pixelmap_height = (GX_VALUE)height; |
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destination -> gx_pixelmap_width = (GX_VALUE)width; |
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/* Safe int math is not required here, calling function limits max width, height to 14 bits so |
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overflow cannot occur. */ |
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destination -> gx_pixelmap_data_size = (UINT)(height * width) * sizeof(GX_UBYTE); |
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/* Safe int math is not required here, calling function limits max width, height to 14 bits so |
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overflow cannot occur. */ |
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destination -> gx_pixelmap_aux_data_size = (UINT)(height * width) * sizeof(GX_UBYTE); |
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/* Allocate memory to load pixelmap data. */ |
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destination -> gx_pixelmap_data = (GX_UBYTE *)_gx_system_memory_allocator(destination -> gx_pixelmap_data_size); |
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✓✓ |
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if (destination -> gx_pixelmap_data == GX_NULL) |
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{ |
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return GX_SYSTEM_MEMORY_ERROR; |
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} |
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destination -> gx_pixelmap_aux_data = (GX_UBYTE *)_gx_system_memory_allocator(destination -> gx_pixelmap_aux_data_size); |
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✓✓ |
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if (destination -> gx_pixelmap_aux_data == GX_NULL) |
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{ |
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_gx_system_memory_free((void *)destination -> gx_pixelmap_data); |
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return GX_SYSTEM_MEMORY_ERROR; |
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} |
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put = (GX_UBYTE *)destination -> gx_pixelmap_data; |
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putalpha = (GX_UBYTE *)destination -> gx_pixelmap_aux_data; |
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/* Loop through destination's pixel and fill each pixel with |
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the interpolation of 4 nearest neighboring pixels.*/ |
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✓✓ |
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for (y = 0; y < height; y++) |
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{ |
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✓✓ |
2648183 |
for (x = 0; x < width; x++) |
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{ |
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/* Find the original source pixel that the destination pixel conrespond to. */ |
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2632980 |
xx = (xradio * x) >> 8; |
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2632980 |
yy = (yradio * y) >> 8; |
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/* The coordinates of the original source pixel are truncate value, |
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calucate their distance between the mathematical coordinates. */ |
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2632980 |
xdiff = (xradio * x) & 0xff; |
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2632980 |
ydiff = (yradio * y) & 0xff; |
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get = (GX_UBYTE *)src -> gx_pixelmap_data; |
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2632980 |
get += yy * src -> gx_pixelmap_width; |
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2632980 |
get += xx; |
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getalpha = (GX_UBYTE *)src -> gx_pixelmap_aux_data; |
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getalpha += yy * src -> gx_pixelmap_width; |
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2632980 |
getalpha += xx; |
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/* Calculate 4 nearest neighboring pixels around the mathematical point of original pixel. */ |
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2632980 |
neighbor_pixels[0][0] = *get; |
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alpha[0] = *getalpha; |
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✓✓✓✓
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2632980 |
if ((xx < src -> gx_pixelmap_width - 1) && (yy < src -> gx_pixelmap_height - 1)) |
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{ |
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neighbor_pixels[0][1] = *(get + 1); |
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neighbor_pixels[1][0] = *(get + src -> gx_pixelmap_width); |
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neighbor_pixels[1][1] = *(get + src -> gx_pixelmap_width + 1); |
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2626839 |
alpha[1] = *(getalpha + 1); |
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2626839 |
alpha[2] = *(getalpha + src -> gx_pixelmap_width); |
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2626839 |
alpha[3] = *(getalpha + src -> gx_pixelmap_width + 1); |
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} |
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else |
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{ |
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✓✓ |
6141 |
if ((xx == src -> gx_pixelmap_width - 1) && |
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✓✓ |
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(yy == src -> gx_pixelmap_height - 1)) |
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{ |
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/* Handle right bottom corder pixel. */ |
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neighbor_pixels[0][1] = neighbor_pixels[0][0]; |
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neighbor_pixels[1][0] = neighbor_pixels[0][0]; |
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neighbor_pixels[1][1] = neighbor_pixels[0][0]; |
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alpha[1] = alpha[0]; |
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alpha[2] = alpha[0]; |
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alpha[3] = alpha[0]; |
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} |
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✓✓ |
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else if (xx == src -> gx_pixelmap_width - 1) |
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{ |
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/* Handle pixels in right edge. */ |
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neighbor_pixels[0][1] = neighbor_pixels[0][0]; |
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neighbor_pixels[1][0] = *(get + src -> gx_pixelmap_width); |
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neighbor_pixels[1][1] = neighbor_pixels[1][0]; |
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2001 |
alpha[1] = alpha[0]; |
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alpha[2] = *(getalpha + src -> gx_pixelmap_width); |
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alpha[3] = alpha[2]; |
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} |
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else |
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{ |
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/* Handle pixels in bottom edge. */ |
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4134 |
neighbor_pixels[0][1] = *(get + 1); |
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4134 |
neighbor_pixels[1][0] = neighbor_pixels[0][0]; |
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4134 |
neighbor_pixels[1][1] = neighbor_pixels[0][1]; |
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4134 |
alpha[1] = *(getalpha + 1); |
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4134 |
alpha[2] = alpha[0]; |
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4134 |
alpha[3] = alpha[1]; |
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} |
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} |
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/* Calulate pixel values by interpolating 4 neighboring pixels. */ |
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2632980 |
red = (REDVAL_332(neighbor_pixels[0][0]) * (alpha[0]) * (256 - (GX_COLOR)xdiff) * (256 - (GX_COLOR)ydiff) + \ |
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2632980 |
REDVAL_332(neighbor_pixels[0][1]) * (alpha[1]) * (GX_COLOR)xdiff * (256 - (GX_COLOR)ydiff) + \ |
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2632980 |
REDVAL_332(neighbor_pixels[1][0]) * (alpha[2]) * (GX_COLOR)ydiff * (256 - (GX_COLOR)xdiff) + \ |
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2632980 |
REDVAL_332(neighbor_pixels[1][1]) * (alpha[3]) * (GX_COLOR)xdiff * (GX_COLOR)ydiff) >> 16; |
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2632980 |
green = (GREENVAL_332(neighbor_pixels[0][0]) * (alpha[0]) * (256 - (GX_COLOR)xdiff) * (256 - (GX_COLOR)ydiff) + \ |
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2632980 |
GREENVAL_332(neighbor_pixels[0][1]) * (alpha[1]) * (GX_COLOR)xdiff * (256 - (GX_COLOR)ydiff) + \ |
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2632980 |
GREENVAL_332(neighbor_pixels[1][0]) * (alpha[2]) * (GX_COLOR)ydiff * (256 - (GX_COLOR)xdiff) + \ |
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2632980 |
GREENVAL_332(neighbor_pixels[1][1]) * (alpha[3]) * (GX_COLOR)xdiff * (GX_COLOR)ydiff) >> 16; |
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2632980 |
blue = (BLUEVAL_332(neighbor_pixels[0][0]) * (alpha[0]) * (256 - (GX_COLOR)xdiff) * (256 - (GX_COLOR)ydiff) + \ |
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2632980 |
BLUEVAL_332(neighbor_pixels[0][1]) * (alpha[1]) * (GX_COLOR)xdiff * (256 - (GX_COLOR)ydiff) + \ |
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2632980 |
BLUEVAL_332(neighbor_pixels[1][0]) * (alpha[2]) * (GX_COLOR)ydiff * (256 - (GX_COLOR)xdiff) + \ |
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2632980 |
BLUEVAL_332(neighbor_pixels[1][1]) * (alpha[3]) * (GX_COLOR)xdiff * (GX_COLOR)ydiff) >> 16; |
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|
2632980 |
alpha[0] = ((alpha[0]) * (256 - (GX_COLOR)xdiff) * (256 - (GX_COLOR)ydiff) + \ |
352 |
|
2632980 |
(alpha[1]) * (GX_COLOR)xdiff * (256 - (GX_COLOR)ydiff) + \ |
353 |
|
2632980 |
(alpha[2]) * (GX_COLOR)ydiff * (256 - (GX_COLOR)xdiff) + \ |
354 |
|
2632980 |
(alpha[3]) * (GX_COLOR)xdiff * (GX_COLOR)ydiff) >> 16; |
355 |
|
|
|
356 |
✓✓ |
2632980 |
if (alpha[0]) |
357 |
|
|
{ |
358 |
|
1161470 |
red /= alpha[0]; |
359 |
|
1161470 |
green /= alpha[0]; |
360 |
|
1161470 |
blue /= alpha[0]; |
361 |
|
|
} |
362 |
|
|
|
363 |
|
2632980 |
alpha[0] = alpha[0] > 255 ? 255 : alpha[0]; |
364 |
|
2632980 |
red = red > 7 ? 7 : red; |
365 |
|
2632980 |
green = green > 7 ? 7 : green; |
366 |
|
2632980 |
blue = blue > 3 ? 3 : blue; |
367 |
|
|
|
368 |
|
2632980 |
*put++ = (GX_UBYTE)ASSEMBLECOLOR_332(red, green, blue); |
369 |
|
2632980 |
*putalpha++ = (GX_UBYTE)alpha[0]; |
370 |
|
|
} |
371 |
|
|
} |
372 |
|
|
|
373 |
|
106 |
return GX_SUCCESS; |
374 |
|
|
} |
375 |
|
|
/**************************************************************************/ |
376 |
|
|
/* */ |
377 |
|
|
/* FUNCTION RELEASE */ |
378 |
|
|
/* */ |
379 |
|
|
/* _gx_utility_8bpp_pixelmap_resize PORTABLE C */ |
380 |
|
|
/* 6.1 */ |
381 |
|
|
/* AUTHOR */ |
382 |
|
|
/* */ |
383 |
|
|
/* Kenneth Maxwell, Microsoft Corporation */ |
384 |
|
|
/* */ |
385 |
|
|
/* DESCRIPTION */ |
386 |
|
|
/* */ |
387 |
|
|
/* This function resize an 8bpp format uncompressed pixelmap with or */ |
388 |
|
|
/* without transparent channel. */ |
389 |
|
|
/* */ |
390 |
|
|
/* INPUT */ |
391 |
|
|
/* */ |
392 |
|
|
/* src The source pixelmap */ |
393 |
|
|
/* destination The resized pixelmap to be */ |
394 |
|
|
/* returned */ |
395 |
|
|
/* width New width */ |
396 |
|
|
/* height New height */ |
397 |
|
|
/* */ |
398 |
|
|
/* OUTPUT */ |
399 |
|
|
/* */ |
400 |
|
|
/* status Completion status */ |
401 |
|
|
/* */ |
402 |
|
|
/* CALLS */ |
403 |
|
|
/* */ |
404 |
|
|
/* _gx_system_memory_allocator Application defined memory */ |
405 |
|
|
/* allocation function */ |
406 |
|
|
/* */ |
407 |
|
|
/* CALLED BY */ |
408 |
|
|
/* */ |
409 |
|
|
/* GUIX Internal Code */ |
410 |
|
|
/* */ |
411 |
|
|
/* RELEASE HISTORY */ |
412 |
|
|
/* */ |
413 |
|
|
/* DATE NAME DESCRIPTION */ |
414 |
|
|
/* */ |
415 |
|
|
/* 05-19-2020 Kenneth Maxwell Initial Version 6.0 */ |
416 |
|
|
/* 09-30-2020 Kenneth Maxwell Modified comment(s), */ |
417 |
|
|
/* resulting in version 6.1 */ |
418 |
|
|
/* */ |
419 |
|
|
/**************************************************************************/ |
420 |
|
647 |
UINT _gx_utility_8bpp_pixelmap_resize(GX_PIXELMAP *src, GX_PIXELMAP *destination, INT width, INT height) |
421 |
|
|
{ |
422 |
|
|
UINT status; |
423 |
|
|
|
424 |
✓✓ |
647 |
if (src -> gx_pixelmap_flags & GX_PIXELMAP_ALPHA) |
425 |
|
|
{ |
426 |
|
|
/* alpha, no compression */ |
427 |
|
108 |
status = _gx_utility_8bpp_pixelmap_alpha_resize(src, destination, width, height); |
428 |
|
|
} |
429 |
|
|
else |
430 |
|
|
{ |
431 |
|
|
/* no compression or transparent channel */ |
432 |
|
539 |
status = _gx_utility_8bpp_pixelmap_raw_resize(src, destination, width, height); |
433 |
|
|
} |
434 |
|
|
|
435 |
|
647 |
return status; |
436 |
|
|
} |
437 |
|
|
|
438 |
|
|
/**************************************************************************/ |
439 |
|
|
/* */ |
440 |
|
|
/* FUNCTION RELEASE */ |
441 |
|
|
/* */ |
442 |
|
|
/* _gx_utility_8bit_alphamap_resize PORTABLE C */ |
443 |
|
|
/* 6.1.7 */ |
444 |
|
|
/* AUTHOR */ |
445 |
|
|
/* */ |
446 |
|
|
/* Kenneth Maxwell, Microsoft Corporation */ |
447 |
|
|
/* */ |
448 |
|
|
/* DESCRIPTION */ |
449 |
|
|
/* */ |
450 |
|
|
/* This function resize an 8bit uncompressed alphamap. */ |
451 |
|
|
/* */ |
452 |
|
|
/* INPUT */ |
453 |
|
|
/* */ |
454 |
|
|
/* src The source pixelmap */ |
455 |
|
|
/* destination The resized pixelmap to be */ |
456 |
|
|
/* returned */ |
457 |
|
|
/* width New width */ |
458 |
|
|
/* height New height */ |
459 |
|
|
/* */ |
460 |
|
|
/* OUTPUT */ |
461 |
|
|
/* */ |
462 |
|
|
/* status Completion status */ |
463 |
|
|
/* */ |
464 |
|
|
/* CALLS */ |
465 |
|
|
/* */ |
466 |
|
|
/* _gx_system_memory_allocator Application defined memory */ |
467 |
|
|
/* allocation function */ |
468 |
|
|
/* */ |
469 |
|
|
/* CALLED BY */ |
470 |
|
|
/* */ |
471 |
|
|
/* GUIX Internal Code */ |
472 |
|
|
/* */ |
473 |
|
|
/* RELEASE HISTORY */ |
474 |
|
|
/* */ |
475 |
|
|
/* DATE NAME DESCRIPTION */ |
476 |
|
|
/* */ |
477 |
|
|
/* 05-19-2020 Kenneth Maxwell Initial Version 6.0 */ |
478 |
|
|
/* 09-30-2020 Kenneth Maxwell Modified comment(s), */ |
479 |
|
|
/* resulting in version 6.1 */ |
480 |
|
|
/* 06-02-2021 Kenneth Maxwell Modified comment(s), */ |
481 |
|
|
/* removed unused variable */ |
482 |
|
|
/* assignment, */ |
483 |
|
|
/* resulting in version 6.1.7 */ |
484 |
|
|
/* */ |
485 |
|
|
/**************************************************************************/ |
486 |
|
3885 |
UINT _gx_utility_8bit_alphamap_resize(GX_PIXELMAP *src, GX_PIXELMAP *destination, INT width, INT height) |
487 |
|
|
{ |
488 |
|
|
/* The pixelmap resize function is implemented from bilinear interpolation |
489 |
|
|
image scaling algorithm. */ |
490 |
|
|
|
491 |
|
|
GX_UBYTE *get; |
492 |
|
|
GX_UBYTE *put; |
493 |
|
|
INT xdiff; |
494 |
|
|
INT ydiff; |
495 |
|
|
INT xradio; |
496 |
|
|
INT yradio; |
497 |
|
|
INT x; |
498 |
|
|
INT y; |
499 |
|
|
INT xx; |
500 |
|
|
INT yy; |
501 |
|
3885 |
GX_UBYTE neighbor_pixels[2][2] = {{0, 0}, {0, 0}}; |
502 |
|
|
INT alpha; |
503 |
|
|
|
504 |
|
|
/* Calculate scale ratio and enlarge it by 256 times to keep precision. */ |
505 |
|
3885 |
xradio = ((src -> gx_pixelmap_width) << 8) / width; |
506 |
|
3885 |
yradio = ((src -> gx_pixelmap_height) << 8) / height; |
507 |
|
|
|
508 |
|
|
/* Fill property values into destination pixelmap structure. */ |
509 |
|
3885 |
destination -> gx_pixelmap_flags = src -> gx_pixelmap_flags; |
510 |
|
3885 |
destination -> gx_pixelmap_format = src -> gx_pixelmap_format; |
511 |
|
|
|
512 |
|
3885 |
destination -> gx_pixelmap_height = (GX_VALUE)height; |
513 |
|
3885 |
destination -> gx_pixelmap_width = (GX_VALUE)width; |
514 |
|
|
|
515 |
|
|
/* Safe int math is not required here, calling function limits max width, height to 14 bits so |
516 |
|
|
overflow cannot occur. */ |
517 |
|
3885 |
destination -> gx_pixelmap_data_size = (UINT)(height * width) * sizeof(GX_COLOR); |
518 |
|
|
|
519 |
|
|
/* Allocate memory to load pixelmap data. */ |
520 |
|
3885 |
destination -> gx_pixelmap_data = (GX_UBYTE *)_gx_system_memory_allocator(destination -> gx_pixelmap_data_size); |
521 |
|
|
|
522 |
✓✓ |
3885 |
if (destination -> gx_pixelmap_data == GX_NULL) |
523 |
|
|
{ |
524 |
|
2 |
return GX_SYSTEM_MEMORY_ERROR; |
525 |
|
|
} |
526 |
|
|
|
527 |
|
3883 |
put = (GX_UBYTE *)destination -> gx_pixelmap_data; |
528 |
|
|
|
529 |
|
|
/* Loop through destination's pixel and fill each pixel with |
530 |
|
|
the interpolation of 4 nearest neighboring pixels.*/ |
531 |
✓✓ |
91320 |
for (y = 0; y < height; y++) |
532 |
|
|
{ |
533 |
✓✓ |
4805866 |
for (x = 0; x < width; x++) |
534 |
|
|
{ |
535 |
|
|
/* Find the original source pixel that the destination pixel conrespond to. */ |
536 |
|
4718429 |
xx = (xradio * x) >> 8; |
537 |
|
4718429 |
yy = (yradio * y) >> 8; |
538 |
|
|
|
539 |
|
|
/* The coordinates of the original source pixel are truncate value, |
540 |
|
|
calucate their distance between the mathematical coordinates. */ |
541 |
|
4718429 |
xdiff = xradio * x - (xx << 8); |
542 |
|
4718429 |
ydiff = yradio * y - (yy << 8); |
543 |
|
|
|
544 |
|
4718429 |
get = (GX_UBYTE *)src -> gx_pixelmap_data; |
545 |
|
4718429 |
get += yy * src -> gx_pixelmap_width; |
546 |
|
4718429 |
get += xx; |
547 |
|
|
|
548 |
|
|
/* Calculate 4 nearest neighboring pixels around the mathematical point of original pixel. */ |
549 |
|
4718429 |
neighbor_pixels[0][0] = *get; |
550 |
|
|
|
551 |
✓✓✓✓
|
4718429 |
if ((xx < src -> gx_pixelmap_width - 1) && (yy < src -> gx_pixelmap_height - 1)) |
552 |
|
|
{ |
553 |
|
4691188 |
neighbor_pixels[0][1] = *(get + 1); |
554 |
|
4691188 |
neighbor_pixels[1][0] = *(get + src -> gx_pixelmap_width); |
555 |
|
4691188 |
neighbor_pixels[1][1] = *(get + src -> gx_pixelmap_width + 1); |
556 |
|
|
} |
557 |
|
|
else |
558 |
|
|
{ |
559 |
|
|
|
560 |
✓✓ |
27241 |
if ((xx == src -> gx_pixelmap_width - 1) && |
561 |
✓✓ |
9197 |
(yy == src -> gx_pixelmap_height - 1)) |
562 |
|
|
{ |
563 |
|
|
/* Hanle pixels in right bottom corner. */ |
564 |
|
36 |
neighbor_pixels[0][1] = neighbor_pixels[0][0]; |
565 |
|
36 |
neighbor_pixels[1][0] = neighbor_pixels[0][0]; |
566 |
|
36 |
neighbor_pixels[1][1] = neighbor_pixels[0][0]; |
567 |
|
|
} |
568 |
✓✓ |
27205 |
else if (xx == src -> gx_pixelmap_width - 1) |
569 |
|
|
{ |
570 |
|
|
/* Handle pixels in right edge. */ |
571 |
|
9161 |
neighbor_pixels[0][1] = neighbor_pixels[0][0]; |
572 |
|
9161 |
neighbor_pixels[1][0] = *(get + src -> gx_pixelmap_width); |
573 |
|
9161 |
neighbor_pixels[1][1] = neighbor_pixels[1][0]; |
574 |
|
|
} |
575 |
|
|
else |
576 |
|
|
{ |
577 |
|
|
/* Handle pixels in bottom edge. */ |
578 |
|
18044 |
neighbor_pixels[0][1] = *(get + 1); |
579 |
|
18044 |
neighbor_pixels[1][0] = neighbor_pixels[0][0]; |
580 |
|
18044 |
neighbor_pixels[1][1] = neighbor_pixels[0][1]; |
581 |
|
|
} |
582 |
|
|
} |
583 |
|
|
|
584 |
|
|
/* Calulate alpha values by interpolating 4 neighboring pixels. */ |
585 |
|
4718429 |
alpha = (INT)(((neighbor_pixels[0][0]) * (256 - (ULONG)xdiff) * (256 - (ULONG)ydiff) + \ |
586 |
|
4718429 |
(neighbor_pixels[0][1]) * (ULONG)xdiff * (256 - (ULONG)ydiff) + \ |
587 |
|
4718429 |
(neighbor_pixels[1][0]) * (ULONG)ydiff * (256 - (ULONG)xdiff) + \ |
588 |
|
4718429 |
(neighbor_pixels[1][1]) * (ULONG)xdiff * (ULONG)ydiff) >> 16); |
589 |
|
|
|
590 |
|
4718429 |
*put++ = (GX_UBYTE)alpha; |
591 |
|
|
} |
592 |
|
|
} |
593 |
|
|
|
594 |
|
3883 |
return GX_SUCCESS; |
595 |
|
|
} |
596 |
|
|
|