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| After this call, the final output image dimensions, including any requested scaling, are available in the JPEG object; so is the selected colormap, if colormapped output has been requested. Useful fields include output_width image width and height, as scaled output_height out_color_components # of color components in out_color_space output_components # of color components returned per pixel colormap the selected colormap, if any actual_number_of_colors number of entries in colormap output_components is 1 (a colormap index) when quantizing colors; otherwise it equals out_color_components. It is the number of JSAMPLE values that will be emitted per pixel in the output arrays. Typically you will need to allocate data buffers to hold the incoming image. You will need output_width * output_components JSAMPLEs per scanline in your output buffer, and a total of output_height scanlines will be returned. Note: if you are using the JPEG library's internal memory manager to allocate data buffers (as djpeg does), then the manager's protocol requires that you request large buffers *before* calling jpeg_start_decompress(). This is a little tricky since the output_XXX fields are not normally valid then. You can make them valid by calling jpeg_calc_output_dimensions() after setting the relevant parameters (scaling, output color space, and quantization flag). ... The decompression parameters that determine the basic properties of the returned image are: J_COLOR_SPACE out_color_space Output color space. jpeg_read_header() sets an appropriate default based on jpeg_color_space; typically it will be RGB or grayscale. The application can change this field to request output in a different colorspace. For example, set it to JCS_GRAYSCALE to get grayscale output from a color file. (This is useful for previewing: grayscale output is faster than full color since the color components need not be processed.) Note that not all possible color space transforms are currently implemented; you may need to extend jdcolor.c if you want an unusual conversion. ... boolean quantize_colors If set TRUE, colormapped output will be delivered. Default is FALSE, meaning that full-color output will be delivered. ... When quantize_colors is TRUE, the target color map is described by the next two fields. colormap is set to NULL by jpeg_read_header(). The application can supply a color map by setting colormap non-NULL and setting actual_number_of_colors to the map size. Otherwise, jpeg_start_decompress() selects a suitable color map and sets these two fields itself. [Implementation restriction: at present, an externally supplied colormap is only accepted for 3-component output color spaces.] JSAMPARRAY colormap The color map, represented as a 2-D pixel array of out_color_components rows and actual_number_of_colors columns. Ignored if not quantizing. CAUTION: if the JPEG library creates its own colormap, the storage pointed to by this field is released by jpeg_finish_decompress(). Copy the colormap somewhere else first, if you want to save it. int actual_number_of_colors The number of colors in the color map. ... int out_color_components Number of color components in out_color_space. int output_components Number of color components returned. [출처 : libjpeg.doc] |
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| 12 ################################################################################################### 13 # FOR LINUX PLATFORMS # 14 ################################################################################################### 15 16 # Generic components 17 # ------------------ 18 ifeq "$(DVD_OS)" "LINUX" 19 ST40_TARGETS := $(LIB_PREFIX)stapi_$(DVD_TRANSPORT)$(LIB_SUFFIX) 20 ST40_EXPORTS := $(LIB_PREFIX)stapi_$(DVD_TRANSPORT)$(LIB_SUFFIX) 21 22 # multicom stevt stcommon stclkrv_hard stfdma stmerge \ 23 # stavmem sti2c stpio stpwm sttuner stdenc stlayer stvout stvtg stvid stvin stos stvmix \ 24 # stgxobj staudlx stcc stttx stvbi stblit stblast stsmart sthdmi stsubt stsys stfastfilter stgfb 25 26 # 7100 Platform 27 # ------------- 28 ifeq "$(DVD_BACKEND)" "7100" 29 ST40_IMPORTS := multicom stevt stcommon stclkrv_hard stfdma stmerge \ 30 stavmem sti2c stpio stpwm stdenc stlayer stvout stvtg stvid stvin stos stvmix \ 31 stgxobj staudlx stttx stvbi stblit stblast stsmart sthdmi stsys stgfb $(DVD_EXTRA_STA PI_DRIVERS) 32 ifeq "$(SECURITY)" "" 33 ST40_IMPORTS += stpti4 34 endif 35 endif |
| STBlit alpha - Bitmap 팔레트 alpha (6) | 2009.07.09 |
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