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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.
115 lines
6.3 KiB
C
115 lines
6.3 KiB
C
#pragma once
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#include "gskgputypesprivate.h"
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#include <graphene.h>
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G_BEGIN_DECLS
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typedef struct _GskGpuCached GskGpuCached;
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typedef struct _GskGpuCachedClass GskGpuCachedClass;
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typedef struct _GskGpuCachedAtlas GskGpuCachedAtlas;
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struct _GskGpuCachedClass
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{
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gsize size;
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const char *name;
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void (* free) (GskGpuCache *cache,
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GskGpuCached *cached);
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gboolean (* should_collect) (GskGpuCache *cache,
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GskGpuCached *cached,
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gint64 cache_timeout,
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gint64 timestamp);
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};
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struct _GskGpuCached
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{
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const GskGpuCachedClass *class;
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GskGpuCachedAtlas *atlas;
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GskGpuCached *next;
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GskGpuCached *prev;
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gint64 timestamp;
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gboolean stale;
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guint pixels; /* For glyphs and textures, pixels. For atlases, alive pixels */
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};
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#define GSK_TYPE_GPU_CACHE (gsk_gpu_cache_get_type ())
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#define GSK_GPU_CACHE(o) (G_TYPE_CHECK_INSTANCE_CAST ((o), GSK_TYPE_GPU_CACHE, GskGpuCache))
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#define GSK_GPU_CACHE_CLASS(k) (G_TYPE_CHECK_CLASS_CAST ((k), GSK_TYPE_GPU_CACHE, GskGpuCacheClass))
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#define GSK_IS_GPU_CACHE(o) (G_TYPE_CHECK_INSTANCE_TYPE ((o), GSK_TYPE_GPU_CACHE))
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#define GSK_IS_GPU_CACHE_CLASS(k) (G_TYPE_CHECK_CLASS_TYPE ((k), GSK_TYPE_GPU_CACHE))
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#define GSK_GPU_CACHE_GET_CLASS(o) (G_TYPE_INSTANCE_GET_CLASS ((o), GSK_TYPE_GPU_CACHE, GskGpuCacheClass))
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typedef struct _GskGpuCacheClass GskGpuCacheClass;
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struct _GskGpuCacheClass
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{
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GObjectClass parent_class;
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};
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GType gsk_gpu_cache_get_type (void) G_GNUC_CONST;
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GskGpuCache * gsk_gpu_cache_new (GskGpuDevice *device);
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gpointer gsk_gpu_cached_new (GskGpuCache *cache,
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const GskGpuCachedClass *class);
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GskGpuDevice * gsk_gpu_cache_get_device (GskGpuCache *self);
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void gsk_gpu_cache_set_time (GskGpuCache *self,
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gint64 timestamp);
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gboolean gsk_gpu_cache_gc (GskGpuCache *self,
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gint64 cache_timeout,
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gint64 timestamp);
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gsize gsk_gpu_cache_get_dead_textures (GskGpuCache *self);
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gsize gsk_gpu_cache_get_dead_texture_pixels (GskGpuCache *self);
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GskGpuImage * gsk_gpu_cache_get_atlas_image (GskGpuCache *self);
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GskGpuImage * gsk_gpu_cache_lookup_texture_image (GskGpuCache *self,
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GdkTexture *texture,
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GdkColorState *color_state);
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void gsk_gpu_cache_cache_texture_image (GskGpuCache *self,
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GdkTexture *texture,
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GskGpuImage *image,
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GdkColorState *color_state);
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GskGpuImage * gsk_gpu_cache_lookup_tile (GskGpuCache *self,
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GdkTexture *texture,
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guint lod_level,
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GskScalingFilter lod_filter,
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gsize tile_id,
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GdkColorState **out_color_state);
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void gsk_gpu_cache_cache_tile (GskGpuCache *self,
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GdkTexture *texture,
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guint lod_level,
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GskScalingFilter lod_filter,
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gsize tile_id,
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GskGpuImage *image,
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GdkColorState *color_state);
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typedef enum
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{
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GSK_GPU_GLYPH_X_OFFSET_1 = 0x1,
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GSK_GPU_GLYPH_X_OFFSET_2 = 0x2,
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GSK_GPU_GLYPH_X_OFFSET_3 = 0x3,
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GSK_GPU_GLYPH_Y_OFFSET_1 = 0x4,
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GSK_GPU_GLYPH_Y_OFFSET_2 = 0x8,
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GSK_GPU_GLYPH_Y_OFFSET_3 = 0xC
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} GskGpuGlyphLookupFlags;
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GskGpuImage * gsk_gpu_cache_lookup_glyph_image (GskGpuCache *self,
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GskGpuFrame *frame,
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PangoFont *font,
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PangoGlyph glyph,
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GskGpuGlyphLookupFlags flags,
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float scale,
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graphene_rect_t *out_bounds,
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graphene_point_t *out_origin);
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G_DEFINE_AUTOPTR_CLEANUP_FUNC(GskGpuCache, g_object_unref)
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G_END_DECLS
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