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896ea5b753
linear will average all the pixels for the lod, nearest will just pick one (using the same method as OpenGL/Vulkan, picking bottom right center). This doesn't really make linear/nearest filtering work as it should (because it's still a form of mipmaps), but it has 2 advantages: 1. it gets closer to the desired effect 2. it is a lot faster Because only 1 pixel is chosen from the original image, instead of averaging all pixels, a lot less memory needs to be accessed, and because memory access is the bottleneck for large images, the speedup is almost linear with the number of pixels not accessed. And that means that even for lot level 3, aka 1/8th scale, only 1/64 of the pixels need to be accessed, and everything is 50x faster. Switching gtk4-demo --run=image_scaling to linear/nearest makes all the lag go away for me, even with a 64k x 64k image.
127 lines
8.0 KiB
C
127 lines
8.0 KiB
C
/*
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* Copyright © 2021 Benjamin Otte
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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* Authors: Benjamin Otte <otte@gnome.org>
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*/
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#pragma once
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#include "gdkenums.h"
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#include "gdktypes.h"
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#include <epoxy/gl.h>
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#ifdef GDK_RENDERING_VULKAN
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#include <vulkan/vulkan.h>
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#endif
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G_BEGIN_DECLS
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typedef enum {
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GDK_MEMORY_ALPHA_PREMULTIPLIED,
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GDK_MEMORY_ALPHA_STRAIGHT,
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GDK_MEMORY_ALPHA_OPAQUE
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} GdkMemoryAlpha;
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typedef enum {
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GDK_MEMORY_NONE,
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GDK_MEMORY_U8,
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GDK_MEMORY_U8_SRGB,
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GDK_MEMORY_U16,
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GDK_MEMORY_FLOAT16,
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GDK_MEMORY_FLOAT32,
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GDK_N_DEPTHS
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} GdkMemoryDepth;
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#define GDK_MEMORY_DEPTH_BITS 3
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gsize gdk_memory_format_alignment (GdkMemoryFormat format) G_GNUC_CONST;
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GdkMemoryAlpha gdk_memory_format_alpha (GdkMemoryFormat format) G_GNUC_CONST;
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gsize gdk_memory_format_bytes_per_pixel (GdkMemoryFormat format) G_GNUC_CONST;
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GdkMemoryFormat gdk_memory_format_get_premultiplied (GdkMemoryFormat format) G_GNUC_CONST;
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GdkMemoryFormat gdk_memory_format_get_straight (GdkMemoryFormat format) G_GNUC_CONST;
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const GdkMemoryFormat * gdk_memory_format_get_fallbacks (GdkMemoryFormat format) G_GNUC_CONST;
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GdkMemoryDepth gdk_memory_format_get_depth (GdkMemoryFormat format,
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gboolean srgb) G_GNUC_CONST;
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gsize gdk_memory_format_min_buffer_size (GdkMemoryFormat format,
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gsize stride,
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gsize width,
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gsize height) G_GNUC_CONST;
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gboolean gdk_memory_depth_is_srgb (GdkMemoryDepth depth) G_GNUC_CONST;
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GdkMemoryDepth gdk_memory_depth_merge (GdkMemoryDepth depth1,
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GdkMemoryDepth depth2) G_GNUC_CONST;
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GdkMemoryFormat gdk_memory_depth_get_format (GdkMemoryDepth depth) G_GNUC_CONST;
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GdkMemoryFormat gdk_memory_depth_get_alpha_format (GdkMemoryDepth depth) G_GNUC_CONST;
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const char * gdk_memory_depth_get_name (GdkMemoryDepth depth);
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void gdk_memory_format_gl_format (GdkMemoryFormat format,
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gboolean gles,
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GLint *out_internal_format,
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GLint *out_internal_srgb_format,
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GLenum *out_format,
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GLenum *out_type,
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GLint out_swizzle[4]);
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gboolean gdk_memory_format_gl_rgba_format (GdkMemoryFormat format,
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gboolean gles,
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GdkMemoryFormat *out_actual_format,
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GLint *out_internal_format,
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GLint *out_internal_srgb_format,
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GLenum *out_format,
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GLenum *out_type,
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GLint out_swizzle[4]);
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#ifdef GDK_RENDERING_VULKAN
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VkFormat gdk_memory_format_vk_format (GdkMemoryFormat format,
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VkComponentMapping *out_swizzle);
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VkFormat gdk_memory_format_vk_srgb_format (GdkMemoryFormat format);
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VkFormat gdk_memory_format_vk_rgba_format (GdkMemoryFormat format,
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GdkMemoryFormat *out_rgba_format,
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VkComponentMapping *out_swizzle);
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#endif
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guint32 gdk_memory_format_get_dmabuf_fourcc (GdkMemoryFormat format);
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const char * gdk_memory_format_get_name (GdkMemoryFormat format);
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void gdk_memory_convert (guchar *dest_data,
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gsize dest_stride,
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GdkMemoryFormat dest_format,
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GdkColorState *src_cs,
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const guchar *src_data,
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gsize src_stride,
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GdkMemoryFormat src_format,
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GdkColorState *dest_cs,
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gsize width,
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gsize height);
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void gdk_memory_convert_color_state (guchar *data,
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gsize stride,
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GdkMemoryFormat format,
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GdkColorState *src_color_state,
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GdkColorState *dest_color_state,
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gsize width,
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gsize height);
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void gdk_memory_mipmap (guchar *dest,
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gsize dest_stride,
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GdkMemoryFormat dest_format,
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const guchar *src,
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gsize src_stride,
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GdkMemoryFormat src_format,
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gsize src_width,
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gsize src_height,
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guint lod_level,
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gboolean linear);
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G_END_DECLS
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